US20060091813A1 - Control system to automatically control vehicle headlamps - Google Patents
Control system to automatically control vehicle headlamps Download PDFInfo
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- US20060091813A1 US20060091813A1 US11/301,472 US30147205A US2006091813A1 US 20060091813 A1 US20060091813 A1 US 20060091813A1 US 30147205 A US30147205 A US 30147205A US 2006091813 A1 US2006091813 A1 US 2006091813A1
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- headlamps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
- B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
- B60Q1/06—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle
- B60Q1/08—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle automatically
- B60Q1/085—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle automatically due to special conditions, e.g. adverse weather, type of road, badly illuminated road signs or potential dangers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
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- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/0017—Devices integrating an element dedicated to another function
- B60Q1/0023—Devices integrating an element dedicated to another function the element being a sensor, e.g. distance sensor, camera
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- B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
- B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
- B60Q1/14—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
- B60Q1/1415—Dimming circuits
- B60Q1/1423—Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
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- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
- B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
- B60Q1/14—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
- B60Q1/1415—Dimming circuits
- B60Q1/1423—Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic
- B60Q1/143—Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic combined with another condition, e.g. using vehicle recognition from camera images or activation of wipers
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
- B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
- B60Q1/18—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights being additional front lights
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
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- G06V20/50—Context or environment of the image
- G06V20/56—Context or environment of the image exterior to a vehicle by using sensors mounted on the vehicle
- G06V20/58—Recognition of moving objects or obstacles, e.g. vehicles or pedestrians; Recognition of traffic objects, e.g. traffic signs, traffic lights or roads
- G06V20/584—Recognition of moving objects or obstacles, e.g. vehicles or pedestrians; Recognition of traffic objects, e.g. traffic signs, traffic lights or roads of vehicle lights or traffic lights
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- B60Q2300/05—Special features for controlling or switching of the light beam
- B60Q2300/054—Variable non-standard intensity, i.e. emission of various beam intensities different from standard intensities, e.g. continuous or stepped transitions of intensity
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- B60Q2300/20—Indexing codes relating to the driver or the passengers
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
An automatic vehicle headlamp dimming system which includes an optical system and an imaging processing system. The optical system is configured to discriminate between headlamps and tail lamps, and focus the light rays from the headlamps and tail lamps on different portions of a pixel sensor array. The optical system as well as the image processing system provides for relatively increased discrimination of headlamps and tail lamps of other vehicles and also enables the high beam headlamps of the control vehicle to be controlled as a function of the distance as well as horizontal angular position of other vehicles relative to the controlled vehicle.
Description
- This application is a continuation of U.S. patent application Ser. No. 11/180,346, entitled “CONTROL SYSTEM TO AUTOMATICALLY DIM VEHICLE HEADLAMPS” filed on Jul. 13, 2005, by Joseph S. Stam et al., which is a continuation of U.S. patent application Ser. No. 10/677,453, filed on Oct. 2, 2003, now U.S. Pat. No. 6,919,548, which is a continuation of U.S. patent application Ser. No. 09/874,197, filed on Jun. 5, 2001, now U.S. Pat. No. 6,653,614, which is a continuation of U.S. patent application Ser. No. 09/151,487, filed on Sep. 11, 1998, now U.S. Pat. No. 6,255,639, which is a continuation of U.S. patent application Ser. No. 08/831,232, filed on Apr. 2, 1997, now U.S. Pat. No. 5,837,994. Priority under 35 U.S.C. § 120 is hereby claimed as to each of the above applications and the entire disclosures of each are incorporated herein by reference.
- The present invention relates to a system for automatically dimming vehicle high beam headlamps.
- Regulations set forth by the United States Department of Transportation (DOT) regulate the light emissions of vehicle high beam headlamps. Various state regulations are used to control the amount of glare experienced by drivers of other vehicles whether the vehicle is traveling in the same direction as the controlled vehicle or in an opposite direction.
- Known vehicle high beam headlamp emissions in accordance with the DOT regulations provide an intensity of 40,000 cd at 0 degrees, 10,000 cd at 3 degrees, 3250 cd at 6 degrees, 1500 cd at 9 degrees, and 750 cd at 12 degrees. An example of such an emission pattern is illustrated in
FIG. 1 . In order to avoid an illuminance of 0.5 foot candles (fc) incident on another vehicle, the vehicle high beam headlamps should be dimmed within 230 feet of another vehicle at 0 degrees, 115 feet of another vehicle at a horizontal position of 3 degrees relative to the datum, and 65 feet in the position of the other vehicle is 6 degrees relative to the controlled vehicle. - Various known head light dimmer control systems are known in the art. In order to prevent the drivers of other vehicles from being subjected to excessive glare levels, such automatic headlamp dimmer systems must sense both the head lights as well as the tail lights of other vehicles. While many known systems are adequately able to detect headlamps of oncoming vehicles, such systems are known to inadequately sense tail lights of vehicles traveling ahead of the control vehicle. As such, such systems are not able to automatically dim the high beam headlamps in time to prevent drivers of the vehicles travelling in the same direction as the controlled vehicle being subjected to excessive glare levels.
- U.S. Pat. No. 5,537,003, assigned to the same assignee of the present invention, discloses an automatic headlamp dimming system which includes an optical system for sensing tail lamps as well as headlamps. The '003 patent discloses a single photo diode with a mechanical scanning arrangement for scanning a predetermined field of view. Although the system provides relatively suitable sensing of headlamps as well as tail lamps, the optical subsystem is rather complicated and expensive to manufacture.
- It is an object of the present invention to solve various problems in the prior art.
- It is yet another object of the present invention to provide a vehicle headlamp dimming system which eliminates the need for mechanical optical scanning systems.
- It is yet another object of the present invention to provide a headlamp dimming system that is adapted to dim the high beam head lights at different distances as a function of the horizontal angular position of another vehicle relative to the controlled vehicle.
- Briefly, the present invention relates to an automatic vehicle headlamp dimming system. The system includes an optical system and an imaging processing system. The optical system is configured to discriminate between headlamps and tail lamps and focus the light rays from the headlamps and tail lamps on different portions of a pixel sensor array. The optical system, as well as the image processing system, provides for relatively increased discrimination of headlamps and tail lamps of other vehicles and also enables the high beam headlamps of the control vehicle to be controlled as a function of the distance as well as the horizontal angular position of other vehicles relative to the controlled vehicle.
- These and other features, advantages, and objects of the present invention will be further understood and appreciated by those skilled in the art by reference to the following specification, claims, and appended drawings.
- These and other objects of the present invention will be readily understood with reference to the following specification and attached drawing, wherein:
-
FIG. 1 is a top view illustrating the headlamp emission pattern of a conventional high beam headlamp. -
FIG. 2 is a side cross-sectional view of the optical system, which forms a part of the present invention illustrating light rays incident at a vertical angle within the desired field of view. -
FIG. 3 is similar toFIG. 2 illustrating the light rays incident at a vertical elevation angle beyond the desired field of view. -
FIG. 4 is a top cross sectional view of the optical system illustrated inFIG. 1 illustrating the light rays at a horizontal angle within the desired field of view. -
FIG. 5 is a block diagram of the automatic head light dimming system in accordance with the present invention. -
FIG. 6 is an overall flow diagram of the image processing in accordance with the present invention. -
FIG. 7 is a flow diagram illustrating the method for detecting tail lamps of vehicles within the desired field of view. -
FIG. 8 is a flow diagram for detecting headlamps from other vehicles within the desired field of view. - The automatic headlamp dimming system in accordance with the present invention includes an optical system as illustrated in
FIGS. 2-4 and an image processing system as illustrated inFIGS. 5-8 . In order to enable the high beam headlamps to remain on for the longest reasonable time without subjecting the driver of another vehicle to excessive glare, the automatic headlamp dimming system in accordance with the present invention controls the vehicle high beam headlamps as a function of the distance as well as the horizontal angular position of the other vehicle relative to the controlled vehicle. As will be discussed in more detail below, the optical system is adapted to discriminate between headlamps and tail lamps of other vehicles. The light rays from the headlamps and tail lamps of other vehicles are spatially segregated on a pixel sensor array to provide increased discrimination of headlamps and tail lamps relative to other ambient light sources, such as road signs and reflections from snow and the like. The optical system enables both the horizontal and vertical position of incident lights sources to be determined within the field of view of the optical system. The image processing system processes the pixels to provide for automatic control of the headlamps as a function of the distance and horizontal angular position of another vehicle relative to the control vehicle. As such, the system in accordance with the present invention is adapted to provide optimal control of the vehicle high beam headlamps by allowing the high beam headlamps to remain on for as long as possible while preventing the driver of the other vehicle from being subjected to an undue amount of glare. - Optical System
- Referring to
FIGS. 2-4 , the optical system includes a pair oflenses lens holder 105, and animage array sensor 106. As best shown inFIGS. 2 and 3 , thelenses lenses lenses - The
lens 103 may be formed with a red filter dye for transmitting light with wavelengths greater than 600 nm and focusingred light rays 101 from tail lamps onto one-half of theimage array sensor 106. The red filter dye causes thelens 103 to absorb all light rays at the blue end of the visible spectrum and transmit light rays at the red end of the spectrum. As such, the amount of light transmitted from non-red light sources, such as headlamps, is greatly reduced while light rays from tail lamps are fully transmitted through thelens 103. As such, the relative brightness of the light rays from tail lamps imaged onto theimage array sensor 106 is greatly increased. - The
lens 104 may be formed with a cyan-filtered dye for transmitting light with wavelengths less than 600 nm. Thelens 104 is used to focus the light rays onto the other half of theimage array sensor 106. The cyan filter dye has a complementary effect to the red filter described above. In particular, the red filter dye absorbs light from the blue end of the visible spectrum while transmitting light from the red end of the spectrum. As such, most of the light from sources, such as head lights, is transmitted through thelens 104 while virtually all of the light emanating from tail lamps is blocked. - Both headlamps and tail lamps emit a substantial amount of infrared light. By utilizing lenses with a filter dye or separate filters which inhibit light at wavelengths greater about 750 nm, the infrared light transmitted by the headlamps and tail lamps will be substantially blocked by the
lenses - The use of the red and cyan dyes for the
lenses lenses transparent lenses - The
lenses lenses - A single lens may also be used in place of the
separate lenses - As shown best in
FIGS. 2 and 3 , the horizontal distance between the twolenses image array sensor 106 is slightly different. Offsetting of the twolenses lenses lenses image array sensor 106 is optimized to minimize the dispersion for the band of light transmitted by each of thelenses - As mentioned above, the light rays 101 transmitted through the
lens 103 are imaged onto one-half of theimage array sensor 106 while the light rays 102 transmitted through thelens 104 are imaged onto the other half of theimage array sensor 106. In order to provide such spatial segregation of the light rays transmitted through thelenses lens holder 105 is provided withcutouts 107 and preferably formed or coated with a light absorbing material. Thesecutouts 107 prevent light rays beyond the desired maximum vertical angle transmitted through thered lens 103 from being imaged onto the portion of theimage array sensor 106 reserved for the light rays 102. Conversely, thecutouts 107 also prevent light rays transmitted through thelens 104 from being imaged onto the portion of theimage array sensor 106 reserved for the light rays 101. - The field of view of the optical system is defined by the configuration of the
lenses cutouts 107 relative to theimage array sensor 106. For example, an exemplary field of view of 10 degrees in the vertical direction and 20 degrees in the horizontal directions may be created by the configuration set forth below. In particular, for such a field of view, thelenses lenses lens 103 is positioned 4.15 mm from theimage array sensor 106 while thelens 104 is positioned 4.05 mm away. Both the front and rear surface radii of thelenses - As best shown in
FIGS. 3 and 4 ,circular cutouts 108 are formed in thelens holder 105. A pair of generallyrectangular apertures 110 is formed in arear wall 112. Therear apertures 110 are 1.6 millimeters in the horizontal direction and 0.8 millimeters in the vertical direction. As best shown inFIG. 4 , thecutouts 107 taper from therear apertures 110 to the diameter of thefront cutouts 108 to provide the field of view discussed above. - The configuration described above is thus able to baffle light outside of the desired horizontal and vertical field of view. In particular,
FIG. 3 illustrates how the system baffles light rays incident at angles beyond the vertical field of view.FIG. 4 illustrates light rays being imaged onto theimage array sensor 106 within the horizontal field of view. - The
image array sensor 106 may be CMOS active pixel image sensor array, for example, as disclosed in U.S. Pat. No. 5,471,515, hereby incorporated by reference and available from Photobit LLC of La Crasenta, Calif. CMOS active pixel image sensors provide relatively high sensitivity and low power consumption as well as the ability to integrate other CMOS electronics on the same chip. Theimage array sensor 106 may be a 50×50 40 μm pixel array. The number of pixels in theimage array sensor 106 is selected such that not all pixels fall within the area that thelenses - The
image array sensor 106 provides spatial information regarding light sources within the field of view. The number of pixels present in the array is selected to obtain sufficient spatial detail although the size of the array is not limited and may be selected, and may even be dictated by physical and economic limitations. - The
image array sensor 106 must be sensitive to accurately detect tail lights at several hundred feet. Such sensitivity may be achieved by lengthening the amount of time the photosites in the array are exposed to light during a frame period. A frame period is selected to enable the array to capture and transfer a frame to the image processing system in a short enough time to allow the image processing system to detect another vehicle entering the field of view. A short time period also limits the amount of motion within a frame during the integration period and thus produces a relatively more accurate instantaneous image. - The use of a pixel array also provides other benefits. For example, as mentioned above, the light integration time to capture a frame can be varied. Such a feature allows the system to provide optimal results in varying degrees in darkness. Another important aspect of an image array sensor is the ability to utilize subsets of the pixels within the array or an individual pixel. As such, as the window size is decreased, the readout rates can be increased. Such a feature allows the system to discriminate ambient light sources, such as street lamps. In particular, such a feature allows the system to locate a light source within the frame and capture several samples of the light sources at a rate several times greater than 60 Hz. In particular, if the samples exhibit 120 Hz intensity modulation, the light source is likely a street lamp or other light source powered from a 60 Hz AC power supply. If the light source is not modulated, the light source is likely powered by the vehicle's DC power supply.
- Another potential benefit of the image array sensor is that it allows the field of view immediately in front of the vehicle to be imaged by a higher pixel resolution. Thus, the system may be configured such that the effective pixel resolution decreases as the angle of the vehicle relative to the control vehicle increases thus reducing the amount of processing time in those areas. Such a configuration reduces the sensitivity of the device to light sources from reflective stationary objects on the side of the road.
- An image array sensor could be manufactured in which the pixel pitch is varied as a function of the area in the field of view that the pixel images. For example, pixels imaging the space corresponding to horizontal angles within 3 degrees of the center of the vehicle may be provided with a 10 μm pixel pitch. Pixels imaging horizontal angles between 3 and 6 degrees may be provided with a 20 μm pixel pitch, while those imaging angles greater than 60 degrees may be provided with a 40 μm pitch. While such a configuration may not increase the sensing area, the ability to resolve detail increases; an important aspect in considering the relative size of a tail lamp at a relatively large distance. For example, a 4 1/2 inch diameter tail light at a distance of 200 feet subtends an angle of less than 0.11 degrees. If a 50×50 image array sensor is used to image a 20 degree field of view, the tail lamp would subtend approximately 8% of the total area imaged by the pixel.
- A tail lamp is relatively brighter than its ambient surroundings; however, the red light contributed by the tail light is diluted by the ambient light at such a distance. Such a factor is critical when comparing the amount of red light in a given area to the amount of non-red light in the same area. When the area of space compared is large relative to the light source, the percentage of red light is diminished. By comparison, if 10 μm pixels are used in the center of the
array 106 instead of 40 μm pixels, the tail lamp would subtend 0.04% of the total areas, an improvement of 16 times. - Image Processing System
- The image processing system is illustrated in
FIGS. 5-8 . The image processing system includes theimage array sensor 106; amicroprocessor 204, for example, a Motorola type MC68HC08XL36; aheadlamp control unit 205; and a pair ofheadlamps 206. As mentioned above, an active pixel array sensor may be utilized for theimage array sensor 106. Such an active pixel array sensor includes animage array 201 and an analog to digital converter (ADC) 202. A timing and control circuit is used to control theimage array 201 as well as theADC 202 to control the integration time, read out timing, pixel selection, gain offset and other variables. Themicroprocessor 204 is used to analyze the data collected by theimage array sensor 201. Themicroprocessor 204 is in communication with the headlamp control unit, a conventional unit, implemented, for example, as a relay, which, in turn, controls theheadlamps 206. Theheadlamp control unit 205, in turn, changes the voltage applied to theheadlamp 206 to cause the high beam or bright lamp to be switched on or off. - The flow chart for the headlamp control is illustrated in
FIG. 6 . The system runs in a continuous cycle with occasional interrupts for absolute light measurements, adjustments of ADC parameters, or other functions. - At the beginning of each cycle, two images are acquired through the
lenses step 302, the images from thelenses step 303 through thelens 104. The image acquired through thelens 104 is acquired with a low enough gain to detect oncoming head lights while rejecting lower light level reflections and nuisance light sources. After the images are analyzed, the system checks for very bright lights in the image indicating the sudden appearance of vehicle headlamps or tail lamps within the field of view, as is the case when a car turns in front of the controlled vehicle instep 305. If bright lights are sensed, the device dims theheadlamps 206 immediately and bypasses the time verification as discussed below. The cycle is then repeated. If there were no bright lights, the system proceeds to step 307 to determine if there are any headlamps or tail lamps in the image. - In order to confirm the presence or lack of presence of a headlamp or tail lamp in a frame, an undim counter and a dim counter are used. These counters provide verification of a particular light source whether from a tail lamp or headlamp from consecutive frames before signaling the
headlamp control unit 205 to dim or undim theheadlamps 206, except as described above, when a bright light is detected. By providing verification, anomalies within the device or in the image will not cause spurious operation of theheadlamps 206. - The dim counter is incremented each time a frame with a headlamp or tail lamp is detected until the number of required consecutive frames to take action are reached. The dim counter is set to 0 each time a clear frame is processed. The undim counter is incremented with each clear frame and set to 0 with each frame containing a headlamp or tail lamp. The actual number of consecutive frames required to dim or undim is determined by the overall speed of the device. The more frames used for verification, the less susceptible the system will be to noise and anomalies. However, the device must be able to react quickly to be effective so the number of verification frames is kept relatively low. Whenever a headlamp or tail lamp is detected in
step 307, the undim counter is set to 0 instep 308. Instep 309, the system checks whether theheadlamp 206 high beams are on. If the high beams are off, no further action is required and the cycle is repeated as indicated bystep 317. If the high beams are on, the dim counter is incremented instep 310. After the dim counter is incremented instep 310, the system checks instep 311 if the dim counter has reached the number of consecutive frames required to dim theheadlamps 206. If so, the system proceeds to step 306 and dims theheadlamps 206 and resets both the dim and undim counters and repeats the cycle. Otherwise, the system repeats the cycle and proceeds to step to 317. - In
step 307, if there are no headlamps or tail lamps in the image, the dim counter is set to 0 instep 312. Subsequently, instep 313, the system determines whether thehigh beams 206 are on. If the high beams are on, the system exits repeats the cycle instep 317. Instep 313 if the brights are not on, the undim counter is incremented. After the undim counter is incremented, the system checks instep 315 whether the undim counter has reached the number of consecutive clear frames required to activate thehigh beams 206. If so, the high beams are turned on instep 316, and the cycle is repeated. If the undim counter is less than the required number for activating thebright headlamps 206, the system repeats the cycle instep 317. - The flow diagram for tail light processing is illustrated in
FIG. 7 . As will be discussed in more detail below, the primary method of identifying an object such as a tail light involves comparing the gray scale value of a pixel through thelens 103 to a gray scale value of the pixel representing the same space imaged through the lens, 104. If the value of the pixel imaged through thelens 103 is significantly higher than the value of the pixel imaged through thelens 104, the light source is determined to be red light. In addition to determining if the light is red, the system also checks the brightness of the red light before deciding that the light is a tail lamp by determining if the gray scale value of the pixel is greater than a threshold value. As is known in the art, the brightness of a light source varies with the square of the distance of the light source from the observer. As such, an approximate determination of the distance of a leading vehicle can be made to determine the appropriate time to dim the headlamps. - The threshold value may be computed in a variety of ways. For example, it can be a predetermined fixed number or a number that is a function of the current image sensor and ADC settings. The threshold value can also be determined by computing a threshold as a factor of the average pixel intensity of the entire image which would help eliminate variances caused by changing ambient light sources. In addition, the pixel value may be compared to the average of the pixels in the immediate area of the pikel of interest. This local average method prevents relatively large, moderately bright spots in the image from being seen as vehicle light sources. More particularly, distant tail lamps subtend less than one pixel and thus will only have moderate brightness. Large spots in the image with moderate brightness are most likely caused by reflections from large objects. Close tail lamps which subtend many pixels will have a saturated center which will be brighter than the surrounding pixels allowing the same method to detect them as well.
- The threshold may also be determined by varying the threshold spatially by way of a lookup table or computation. However, the threshold should be determined so that dimming occurs appropriately for the dimmest tail lights allowed by the DOT standards. Distant vehicles are subjected to the most intense portion of the controlled vehicle high beam, thus requiring dimming only directly in front of the controlled vehicle as indicated in
FIG. 1 . Thus, a relatively low threshold may be selected for light sources imaged directly in front of the control vehicle while a higher threshold for light sources that are not directly in front of the control vehicle. For example, as discussed in connection withFIG. 1 , the threshold for pixels imaging the field ofview 3 degrees right and left of the center should correspond to a light level incident on theimage array sensor 106 about 4 times as bright as the threshold for red light directly in front of the vehicle and 12 times as bright for vehicles at 6 degrees. Such a spatially varying threshold helps eliminate false tail lamp detection caused by red reflectors by making the system less sensitive to areas of the sides of the control vehicle. - A similar approach can be taken for varying the threshold for pixels in imaging areas of space and angles above and below the center. However, a more conservative approach can be taken when determining the tail light sensitivity relative to the vertical angle since vehicles tend to move more frequently and rapidly in vertical directions due to hills and bumps in the road. Therefore, by specifying relatively tight vertical thresholds may cause the
bright headlamps 206 to switch on and off as the vehicle moves several degrees up and down. - A hysteresis multiplier may be applied to the threshold to prevent oscillations of the
headlamps 206 when the light source has a gray scale value at or near the threshold. Thus, if thebright headlamps 206 are off, the threshold will be lower for all pixels to prevent the bright headlamps from coming back on, even if the faintest tail lamps are present in the image. However, if thebright headlamps 206 are on, the threshold should be higher so that only tail lamps of sufficient brightness are sensed to indicate that the car is within the dimming range to cause theheadlamps 206 to dim. - One of the biggest problems facing the detection of the tail lamps is the nuisance red light reflected from corner cube reflectors commonly found as markers on the side of the road and on mailboxes. The variable threshold method mentioned above helps eliminate some of this noise. However, when a vehicle approaches a reflector at the proper angles, it is relatively impossible to distinguish a red reflector from a tail lamp. Fortunately, by examining successive frames and investigating the motion of these objects over time, such reflections can be filtered. By storing the location of the tail lamps and images over time or by sensing small regions of interest where the tail lamp is located several consecutive times, the device can look for rightward motion and determine if the light source is a reflector. Additionally, the speed at which the control vehicle overtakes a stationary object is much greater than the relative rate a vehicle would overtake another moving vehicle. Thus, the rate of increase in brightness of the object would be typically much greater for a stationary reflector than for another vehicle. This rate of change in brightness coupled with rightward horizontal motion can be used as signatures to reduce the number of false tail lamps detected.
- A computationally simpler method of analyzing spatial motion of a light source is to simply take several consecutive regions of the local region of interest where the light source is located. Motion in the vertical and horizontal directions is relatively slow for tail lamps of a leading vehicle. Simply sampling a pixel a few consecutive times to see if the tail lamp is present in all samples can adequately eliminate objects which rapidly move within the image.
- The flow diagram for tail lamp processing is illustrated in
FIG. 7 . Initially, instep 318, the system ascertains if the pixel is within the tail lamp window. In particular, as mentioned above, red lights are imaged onto half of theimage array sensor 106. Thus, if the pixel is not within the appropriate half of theimage array sensor 106, the system proceeds to step 319 and moves to another pixel. As mentioned above, there are two criteria for ascertaining whether the image is a tail lamp. The first criteria relates to comparing the gray scale value of the pixel image through thelens 103 with a corresponding gray scale value for the same area in space imaged through thelens 104. If the gray scale value of the pixel imaged through thelens 103 is significantly larger than the gray scale value of the corresponding pixel imaged through thelens 104, one of the criteria for detecting a tail lamp is met. Thus, if the pixel of interest is within the tail lamp window as ascertained instep 318, the gray scale value of the pixel imaged through thelens 103 is compared with the gray scale value of a corresponding pixel imaged through thelens 104 instep 320. If the gray scale value of the pixel image through thelens 103 is not n % greater than the corresponding pixel imaged by thelens 104, the system proceeds to step 319 and examines another pixel. Otherwise, the system proceeds to step 321 and calculates the threshold for the particular pixel based on the region of space it images. For example, as discussed above, the pixel thresholds may be varied based on their spatial relationship within the image array sensor. - As discussed above, the other criteria for tail lamp detection relates to the relative brightness of the pixel relative to neighboring pixels. Thus, in
step 322, the system calculates the average gray scale value of neighboring pixels. If it is determined instep 323 that the pixel gray scale value for the pixel imaged through thelens 103 is n % greater than the average gray scale value of the neighboring pixels, the system proceeds to step 324 and adds the pixel to the tail lamp list for future frames of reference. Otherwise, the system moves to step 319 and moves the next pixel. Insteps step 328. - The flow diagram for head light processing is illustrated in
FIG. 8 . Headlamp detection is similar to tail lamp detection. The primary difference is that only thelens 104 is utilized. As mentioned above, the pixel integration time is shorter and the ADC parameters are such that the image only shows very bright objects, such as headlamps. Most reflections have low intensity light sources which fall well below the zero threshold of the ADC. As such, pixels are compared to the local average intensity of the neighboring pixels. Spatial variances in the thresholds may be set so that pixels corresponding to the center of the field of view are more sensitive and pixels to the left of the image (left hand drive countries) have higher thresholds. These thresholds, however, should not vary spatially to the same degree as the threshold for the tail lamps because of the relatively wide variance in the emission patterns observed from headlamps. In addition, due to the relatively higher potential for more glare to the driver of an oncoming car, the headlamps may be controlled and dimmed relatively more rapidly than in the case when a tail lamp from a vehicle traveling in the same direction is detected. Similar to the tail lamp processing circuit hysteresis may be added to prevent cycling of the headlamps. - An additional concern with headlamp detection arises from the rapid decrease in distance between oncoming vehicles which becomes especially critical when an oncoming vehicle suddenly enters the controlled vehicle's field of view, for example, when turning a corner or in a similar situation. For this reason, an additional flag is used to cause the vehicle to immediately dim the bright headlamps and bypass any verification if the light source is above certain absolute high-level brightness thresholds.
- The primary nuisance light source complicating headlamp detection comes from overhead lights, such as street lights and electrically illuminated street signs. One method of eliminating such nuisance light sources is to analyze their motion. In particular, all overhead street lamps will move vertically upwards in the image as the controlled vehicle is moving. Analyzing this motion provides an efficient method of detecting some street lamps. Unfortunately, distant street lamps appear to be at almost the same elevational angles as distant head lights and the rate of vertical climb in the image does not become great until the street lamp is closer. However, as discussed above, street lighting is AC controlled and thus is subject to 120 Hz intensity modulation. Headlamps powered by DC source do not exhibit this characteristic. Thus, the
image array sensor 106 is able to utilize a small number of pixels for taking several rapid consecutive readings in a window. If the window is small enough, the window can read several hundred frames per second. Once the light source is identified in the image, several frames are read out at a rate of 240 Hz or higher. These readings are then analyzed to detect the intensity modulation. If modulation is present, the light source originates from an AC source and can be ignored. Alternatively, a photodiode can be used in conjunction with a low pass filter to determine the ratio of light in the image that was AC modulated to the unmodulated light. If a significant portion of the light source is AC modulated, the light source present in the image is assumed to be from AC light. Otherwise, the light source is assumed to be from a DC source. - The flow diagram for headlamp processing is illustrated in
FIG. 8 . Initially, the system determines instep 329 whether the pixel is in the headlamp window (i.e., in that portion of theimage array sensor 106 reserved for light arrays imaged through the lens 104). If not, the system proceeds to step 330 and examines the next pixel. Otherwise, the system examines the pixel instep 331 to determine if the pixel is modulated at 120 Hz as discussed above. If so, the light source is assumed to be a street lamp and thus, the system proceeds to the next pixel instep 330. If the pixel is not subject to 120 Hz intensity modulation, the system then computes the average gray scale of neighboring pixels instep 332. Instep 333, the system determines the threshold for the particular pixel based on the area of the space it images. The system next compares the gray scale value of the pixel with an absolute high level threshold instep 334, for example, to determine if any oncoming cars suddenly come into the field of view of the controlled vehicle. If so, the system proceeds to step 335 and sets a flag to cause immediate dimming. Otherwise, the system proceeds to step 336 and determines if the gray scale value of the pixel is n % greater than the average of neighboring pixels. If not, the system returns to step 330 and examines the next pixel. Otherwise, the system proceeds to step 337 and adds the pixel to the headlamp list for future frames to reference. - As discussed above, the system examines light sources as discussed above in
steps headlamps 206. If the system determines that the light source is a street lamp, the system proceeds to step 341 and moves on to the next pixel. - Traditional vehicle lamps systems have the option of the bright lamps being either on or off. The present invention is readily adaptable for use with a headlamp system where the brights can be activated to vary the brightness based on the distance of other vehicles in the field of view. In such an embodiment, the brightness of the headlamps may be varied by various techniques including modulating the duty cycle of the headlamp in order to reduce or increase the overall brightness level.
- Variable intensity headlamps also result in better noise filtration. In particular, whenever a light source is detected which causes the brightness of the controlled headlamps of the vehicles to be decreased, other images can be detected to determine if the intensity of these other light sources decreases by a similar amount. If so, the system would be able to determine that the light source is a reflection from the vehicle's headlamps. Such information can be used as feedback to provide a relatively efficient means for eliminating nuisance light caused by reflections of the control vehicle headlamps. In such an embodiment, the brightness threshold discussed above would not be used. More particularly, the brightness of the brightest headlamp and tail lamp in the images is used to determine the brightness of the controlled vehicle's headlamps. The brighter the headlamps or tail lamp in the images, the dimmer the controlled headlamps.
- Obviously, many modifications and variations of the present invention are possible in light of the above teachings. Thus, it is to be understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specifically described above.
- The above description is considered that of the preferred embodiments only. Modifications of the invention will occur to those skilled in the art and to those who make or use the invention. Therefore, it is understood that the embodiments shown in the drawings and described above are merely for illustrative purposes and not intended to limit the scope of the invention, which is defined by the following claims as interpreted according to the principles of patent law, including the doctrine of equivalents.
Claims (5)
1. A control system for automatically controlling the state of the head lamps of a controlled vehicle, the control system comprising:
an optical system for imaging external sources of light within a predetermined field of view, the optical system including an image array sensor and two or more lenses configured to image said predetermined field of view onto two or more corresponding portions of said array; and
an image processing system for processing images from said optical system and providing a control signal for controlling the head lamps as a function of the relative output of the pixels imaging said external sources of light.
2. The control system as recited in claim 1 , wherein said optical system is fixed relative to said controlled vehicle.
3. The control system as recited in claim 1 , further including means for filtering the light through said predetermined lenses.
4. The control system as recited in claim 3 , wherein said filtering means includes a filter dye for said one or more lenses.
5. The control system as recited in claim 1 , having a first lens and a second lens.
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US09/874,197 US6653614B2 (en) | 1997-04-02 | 2001-06-05 | Control system to automatically control vehicle headlamps |
US10/677,453 US6919548B2 (en) | 1997-04-02 | 2003-10-02 | control system to automatically control vehicle headlamps |
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AU6777098A (en) | 1998-10-22 |
US6255639B1 (en) | 2001-07-03 |
EP0971829A1 (en) | 2000-01-19 |
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CA2284496A1 (en) | 1998-10-08 |
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JP4108631B2 (en) | 2008-06-25 |
ATE208719T1 (en) | 2001-11-15 |
US5837994A (en) | 1998-11-17 |
ES2213076T3 (en) | 2004-08-16 |
US20020005472A1 (en) | 2002-01-17 |
JP2004189229A (en) | 2004-07-08 |
DE69802511T2 (en) | 2002-05-23 |
ES2167879T3 (en) | 2002-05-16 |
US20050242740A1 (en) | 2005-11-03 |
ATE256576T1 (en) | 2004-01-15 |
JP3568210B2 (en) | 2004-09-22 |
CA2284496C (en) | 2002-01-29 |
EP1129902B1 (en) | 2003-12-17 |
JP2001519744A (en) | 2001-10-23 |
KR100493581B1 (en) | 2005-06-08 |
DE69820682T2 (en) | 2004-12-09 |
US5837994C1 (en) | 2001-10-16 |
EP1129902A3 (en) | 2001-09-19 |
EP1129902A2 (en) | 2001-09-05 |
KR20010005899A (en) | 2001-01-15 |
WO1998043850A1 (en) | 1998-10-08 |
DE69820682D1 (en) | 2004-01-29 |
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