CN101197942B - Multi-exposure control method and multi-exposure control device - Google Patents

Multi-exposure control method and multi-exposure control device Download PDF

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Publication number
CN101197942B
CN101197942B CN2007103050835A CN200710305083A CN101197942B CN 101197942 B CN101197942 B CN 101197942B CN 2007103050835 A CN2007103050835 A CN 2007103050835A CN 200710305083 A CN200710305083 A CN 200710305083A CN 101197942 B CN101197942 B CN 101197942B
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confidence level
pixel
image
exposure
time
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CN101197942A (en
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陈海
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The invention discloses a multiple exposure control method which comprises the following steps: a bright image and a dark image are acquired; exposure time of the bright image is larger than that of the dark image; reliability of pixels in the bright image and reliability of pixels in the dark image are acquired; the exposure time of the bright image or the exposure time of the dark image is adjusted according to the acquired reliability of the pixels in the bright image and the acquired reliability of the pixels in the dark image. By adoption of the technical proposal provided by the invention, the method is favorable for enlarging a dynamic range of images.

Description

Multi-exposure control method and multi-exposure control device
Technical field
The present invention relates to technical field of image processing, particularly a kind of multi-exposure control method and multi-exposure control device.
Background technology
In reality scene, the sensible dynamic range of human eye is very big, can discover that brightness be 10 -3Cd/m 2Starlight, can discover also that brightness be 10 5Cd/m 2Sunlight, and human eye also can be perceived the various details in the reality scene under very dark and very bright situation.And the luminance dynamic range of present image capture device is lower, can not see corresponding bright details in bright especially scene, can not see corresponding dark details in dark especially scene, therefore, the luminance dynamic range of image capture device and actual scene and the perception of human eye energy has a long way to go.
In order to address the above problem, prior art has proposed by the method for exposure by turns, Same Scene is obtained the image of different exposure time, with the image of the synthetic great dynamic range of image process method.A kind of multi-exposure control method that prior art provides, this method needs respectively to bright dark controller setting: the percentage threshold that too bright bright pixel number accounts for bright pixel sum is B1, the percentage threshold that too dark bright pixel number accounts for bright pixel sum is D1, the percentage threshold that too bright dark pixel number accounts for dark pixel sum is B2, the percentage threshold that too dark dark pixel number accounts for dark pixel sum is D2, wherein, the time for exposure of bright pixel and dark pixel is controlled respectively.
Fig. 1 shows the time for exposure control method of bright pixel, and this method specifically comprises:
Step 101, seizure image.Term image in this step is meant at least one frame in the image sequence.
Step 102, the too bright bright pixel number of calculating.
In this step specifically be bright pixel that each is independent signal level and predetermined BPTB threshold ratio, the BPTB threshold value is represented " bright pixel is too bright " threshold value.
Whether the percentage that step 103, too bright bright pixel number account for bright pixel sum greater than threshold value B1, if, execution in step 104, if not, execution in step 105.
The time for exposure of step 104, the bright pixel of minimizing, process ends.
Step 105, the too dark bright pixel number of calculating.
In this step specifically be bright pixel that each is independent signal level and predetermined BPTD threshold ratio, the BPTD threshold value is represented " bright pixel is too dark " threshold value.
Whether the percentage that step 106, too dark bright pixel number account for bright pixel sum greater than threshold value D1, if, execution in step 107, if not, process ends.
The time for exposure of step 107, the bright pixel of increase, process ends.
Fig. 2 shows the time for exposure control method of dark pixel, and this method specifically comprises:
Step 201, seizure image.Term image in this step is meant at least one frame in the image sequence.
Step 202, the too dark dark pixel number of calculating.
Whether the percentage that step 203, too dark dark pixel number account for dark pixel sum greater than threshold value D2, if, execution in step 204, if not, execution in step 205.
The time for exposure of step 204, the dark pixel of increase, process ends.
Step 205, the too bright dark pixel number of calculating.
Whether the percentage that step 206, too bright dark pixel number account for dark pixel sum greater than threshold value B2, if, execution in step 207, if not, process ends.
The time for exposure of step 207, the dark pixel of minimizing.
The shortcoming of prior art is:
1, the bright pixel that provides of prior art and the dark pixel cmos imaging pattern of inlaying is very high to technological requirement, the material characteristics of bright pixel and dark pixel has determined the dynamic range of this cmos sensor when dispatching from the factory, and has determined the dynamic range of institute's energy photographic images thus.
2, the cmos imaging pattern that adopts bright pixel and dark pixel to inlay can reduce the resolution of image.
Summary of the invention
The technical problem that the embodiment of the invention will solve provides a kind of multi-exposure control method and multi-exposure control device, helps the dynamic range of expanded view picture.
In view of this, the embodiment of the invention provides:
A kind of multi-exposure control method comprises:
Obtain bright image and dark image; The time for exposure of described bright image is r 1* T0, the time for exposure of described dark image is r 2* T0, wherein, T0 is the reference exposure time, r 1Greater than 1, r 2Less than 1;
Obtain the confidence level of pixel in the confidence level of pixel in the bright image and the dark image;
According to the confidence level of pixel in the confidence level of pixel in the bright image that is obtained and the dark image, adjust the time for exposure of described bright image or the time for exposure of described dark image;
Wherein, described according to pixel in the bright image that is obtained confidence level and dark image in the confidence level of pixel, adjust the time for exposure of described bright image or the time for exposure of described dark image to comprise:
Obtain first kind pixel number, described first kind pixel is that confidence level sum in bright image is less than the pixel of the confidence level sum in dark image; According to described first kind pixel number, obtain described confidence level pixel parameter, described confidence level pixel parameter comprises: the ratio of number of total picture element amount in first kind pixel number and described bright image or the dark image; When described confidence level pixel parameter during, reduce the reference exposure time greater than first threshold; When described confidence level pixel parameter during, increase the reference exposure time less than second threshold value;
Perhaps, obtain the first kind pixel number and the second class pixel number, first kind pixel be confidence level in bright image less than the pixel of the confidence level in the dark image, the second class pixel is that confidence level in bright image is more than or equal to the pixel of the confidence level in the dark image; The ratio that obtains the first kind pixel number and the second class pixel number is as the confidence level pixel parameter; When described confidence level pixel parameter during, reduce the reference exposure time greater than first threshold; When described confidence level pixel parameter during, increase the reference exposure time less than second threshold value;
Perhaps, obtain the confidence level summation of pixel in the bright image; Obtain the confidence level summation of pixel in the dark image; The ratio of the confidence level summation of pixel is as the confidence level pixel parameter in the confidence level summation of asking pixel in the bright image and the dark image; When described confidence level pixel parameter during, reduce the reference exposure time greater than first threshold; When described confidence level pixel parameter during, increase the reference exposure time less than second threshold value.
A kind of multi-exposure control device comprises:
Image acquisition unit is used to obtain bright image and dark image; The time for exposure of described bright image is greater than the time for exposure of described dark image;
Description of drawings
Reference exposure set of time unit is used for arranging reference exposure time T 0;
The time for exposure setting unit of image, the time for exposure that is used for arranging described bright image is r1* T0, the time for exposure of described dark image is r2* T0, wherein r1Greater than 1, r2Less than 1;
The confidence level acquiring unit is for the confidence level of pixel in the confidence level of obtaining bright image pixel and the dark image;
First kind pixel number acquiring unit is used for obtaining first kind pixel number, and described first kind pixel is that confidence level sum in bright image is less than the pixel of the confidence level sum in dark image;
Confidence level pixel parameter computing unit is used for according to described first kind pixel number, obtains described confidence level pixel parameter; Wherein, the confidence level pixel parameter that obtains of described confidence level pixel parameter computing unit comprises: the ratio of number of total picture element amount in first kind pixel number and described bright image or the dark image;
First judging unit is used for judging that whether described confidence level pixel parameter is greater than first threshold;
Second judging unit is used for judging that whether described confidence level pixel parameter is less than Second Threshold;
The reference exposure time control unit, be used for when the judged result of described first judging unit when being, reduce the described reference exposure time; When the judged result of described second judging unit when being, increase the described reference exposure time.
A kind of multi-exposure control device comprises:
Image acquisition unit is used for obtaining bright image and dark image;
Reference exposure set of time unit is used for arranging reference exposure time T 0;
The time for exposure setting unit of image, the time for exposure that is used for arranging described bright image is r1* T0, the time for exposure of described dark image is r2* T0, wherein r1Greater than 1, r2Less than 1;
The confidence level acquiring unit is for the confidence level of pixel in the confidence level of obtaining bright image pixel and the dark image;
The confidence level sum unit of pixel in the bright image is used for obtaining the confidence level sum of all bright all pixels of image;
The confidence level sum unit of pixel in the dark image is used for obtaining the confidence level sum of all dark all pixels of image;
The second class confidence level pixel parameter computing unit, be used to obtain the confidence level pixel parameter, described confidence level pixel parameter comprises: the ratio of the confidence level sum of all pixels in the confidence level sum of all pixels and all dark images of being obtained in the bright image of all that obtained;
First judging unit is used to judge that whether described confidence level pixel parameter is greater than first threshold;
Second judging unit is used to judge that whether described confidence level pixel parameter is less than second threshold value;
The reference exposure time control unit, be used for when the judged result of described first judging unit when being, reduce the described reference exposure time; When the judged result of described second judging unit when being, increase the described reference exposure time.
A technical scheme in the technique scheme has following beneficial effect:
A plurality of image areas that the embodiment of the invention is different with the time for exposure are divided into bright image and dark image, obtain the confidence level of pixel in the confidence level of pixel in the bright image and the dark image, and according to the confidence level of pixel in the confidence level of pixel in the bright image that is obtained and the dark image, adjust the time for exposure of bright image and/or the time for exposure of dark image, realization utilizes the image of bright image and the synthetic great dynamic range of dark image, and can not influence the resolution of composograph.
The time for exposure control method flow chart of the bright pixel that Fig. 1 provides for prior art;
The time for exposure control method flow chart of the dark pixel that Fig. 2 provides for prior art;
The multi-exposure control method flow chart that Fig. 3 provides for the embodiment of the invention one;
The multi-exposure control method flow chart that Fig. 4 provides for the embodiment of the invention two;
The multi-exposure control method flow chart that Fig. 5 provides for the embodiment of the invention three;
The multi-exposure control method flow chart that Fig. 6 provides for the embodiment of the invention four;
The multi-exposure control device structure chart that Fig. 7 provides for the embodiment of the invention five;
The multi-exposure control device structure chart that Fig. 8 provides for the embodiment of the invention six.
Embodiment
The embodiment of the invention is adjusted the time for exposure of bright image and/or dark image accordingly according to the confidence level of bright image and dark image.When adjusting the time for exposure of bright image and dark image, can as required on the basis of original time for exposure, adjust the time for exposure of bright image or dark image in proportion respectively.Also can be bright image and dark one reference exposure time of image setting, time for exposure of bright image and dark image is expressed as the coefficient product of described reference exposure time.In practice, can be the time for exposure of adjusting bright image according to the actual scene decision, still adjust the time for exposure of dark image, perhaps both all adjust.In the embodiment of the invention, to be example by adjusting the time for exposure that the reference exposure time adjusts dark image or bright image, the present invention will be described in detail.
For making the embodiment of the invention clearer, the relational language of earlier embodiment of the invention being used describes:
Reference exposure time T 0: can be the current scene optimum exposure time, be used for determining the time for exposure of image, according to the reference exposure time, the time for exposure that bright image can be set be: r 1* T0, the time for exposure of dark image is: r 2* T0.Wherein, r1＞1, r 2＜1.Preferably, r 1=1/r 2
Consult Fig. 3, the embodiment of the invention one provides a kind of multi-exposure control method, and this inventive embodiments one is that example is described with the double-exposure, and this method comprises:
Step 301, obtain long exposure image and short exposure image.
Wherein, the time for exposure of long exposure image is parameter and the product of reference exposure time greater than 1, such as r 1* T0, r 1＞1; The time for exposure of short exposure image is parameter and the product of reference exposure time less than 1, such as r 2* T0, r 2＜1.Long exposure image is foregoing bright image, and the short exposure image is foregoing dark image.
When adopting double-exposure to take,, can make the clear zone of final composograph blackening occur if the time for exposure difference of long exposure image and short exposure image is too big.Therefore the time for exposure of fixed length exposure image, the time for exposure and the relation of reference exposure between the time of short exposure image can effectively be restrained the appearance of blackening in the clear zone.
Step 302, obtain the confidence level of corresponding pixel in long exposure image and the short exposure image.
Step 303, obtain first kind pixel number.
Wherein, first kind pixel is that confidence level in long exposure image is less than the pixel of the confidence level in the short exposure image.
Step 304, obtain the ratio σ of number of total picture element amount in first kind pixel number and long exposure image or the short exposure image 1, as the confidence level pixel parameter.
Step 305, judgement σ 1Whether greater than first threshold, if, execution in step 306; If not, execution in step 307.
Step 306, minimizing reference exposure time.
Step 307, judgement σ 1During whether less than second threshold value, if execution in step 308 if not, is returned execution in step 301.
Step 308, increase reference exposure time.
Consult Fig. 4, the embodiment of the invention two provides a kind of multi-exposure control method, and this inventive embodiments two is that example is described with the double-exposure, and this method comprises:
Step 401, obtain long exposure image and short exposure image.
Step 402, obtain the confidence level of corresponding pixel in long exposure image and the short exposure image.
Step 403, obtain the first kind pixel number and the second class pixel number.
Perhaps, first kind pixel be confidence level in long exposure image less than the pixel of the confidence level in the short exposure image, the second class pixel is that confidence level in long exposure image is more than or equal to the pixel of the confidence level in the short exposure image.
Step 404, obtain the ratio σ of the first kind pixel number and the second class pixel number 2As the confidence level pixel parameter.
Step 405, judgement σ 2Whether greater than first threshold, if, execution in step 406; If not, execution in step 407.
Step 406, minimizing reference exposure time.
Step 407, judgement σ 2During whether less than second threshold value, if execution in step 407 if not, is returned execution in step 401.
Step 408, increase reference exposure time.
Consult Fig. 5, the embodiment of the invention three provides a kind of multi-exposure control method, and this inventive embodiments three is that example is described with the double-exposure, and this method comprises:
Step 501, obtain long exposure image and short exposure image.
Step 502, obtain the confidence level summation of pixel in the long exposure image; Obtain the confidence level summation of pixel in the short exposure image.
The ratio σ of the confidence level summation of pixel in the confidence level summation of pixel and the short exposure image in step 503, the exposure image of rectificating 3As the confidence level pixel parameter.
Step 504, judgement σ 3Whether greater than first threshold, if, execution in step 505; If not, execution in step 506.
Step 505, minimizing reference exposure time.
Step 506, judgement σ 3During whether less than second threshold value, if execution in step 507 if not, is returned execution in step 501.
Step 507, increase reference exposure time.
In order to obtain wideer dynamic range, make and keep all on-the-spot details in the composograph, perhaps, bright dark transition relaxes in the composograph in order to keep, can be at the different multiple image of time for exposure of Same Scene generation, like this, can adopt a plurality of exposure images on-the-spot details of record by turns.
Consult Fig. 6, the embodiment of the invention four provides a kind of multi-exposure control method, and this embodiment four is that example is described with at least three exposure images, and this method comprises:
Step 601, obtain bright image and dark image.
Wherein, bright image is to equal reference exposure time and image greater than the product of 1 parameter the time for exposure; Dark image is to equal reference exposure time and image less than the product of 1 parameter the time for exposure; The time for exposure of each image is fixedly to be evenly distributed on around the reference exposure time, and the time for exposure of the darkest image of the brightest image from bright image in the dark image is followed successively by: r 1T0, r 2T0, r 3T0........r nT0, T0/r n, T0/r N-1... ... T0/r 1, wherein, r 1＞r 2...＞r n〉=1.
Step 602, obtain the confidence level of pixel in bright image and the dark image.
Step 603, obtain first kind pixel number.
Wherein, first kind pixel is that confidence level sum in bright image is less than the pixel of the confidence level sum in dark image.
Step 604, obtain the ratio σ of number of total picture element amount in first kind pixel number and bright image or the dark image 4, as the confidence level pixel parameter.
Step 605, judgement σ 4Whether greater than first threshold, if, execution in step 606; If not, execution in step 607.
Step 606, minimizing reference exposure time.
Step 607, judgement σ 4During whether less than second threshold value, if execution in step 607 if not, is returned execution in step 601.
Step 608, increase reference exposure time.
In like manner, also can adopt the mode of similar embodiment two to realize for the method for utilizing three above exposure image control time for exposure.Such as, will the confidence level sum in the bright image more than or equal to the pixel of the confidence level sum in dark image as first kind pixel, will the confidence level sum in the bright image less than the pixel of the confidence level sum in dark image as the second class pixel, the ratio of quantity of asking the first kind pixel number and the second class pixel is as the confidence level parameter.
In like manner, also can adopt the mode of similar embodiment three to realize for the method for utilizing three above exposure image control time for exposure.Such as, ask all pixels in all bright images the confidence level sum and, the confidence level sum of all pixels in all dark images, with two and the value ratio as the confidence level parameter.
Wherein, in the various embodiments described above in the image acquisition methods of pixel confidence level can to adopt application number be the algorithm of describing in 200710152256.4 the application documents, also can adopt pixel standard law, pixel gradient or be the methods such as video in window entropy at center, not influence realization of the present invention with this pixel.
Wherein, first threshold is represented the thresholding of a comparison in the various embodiments described above, and this can be inequality in each embodiment for its numerical value; Second threshold value is represented the thresholding of a comparison in the various embodiments described above, and this is inequality in each embodiment for its numerical value.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, read-only memory for example, disk or CD etc.
Consult Fig. 7, the embodiment of the invention five provides a kind of multi-exposure control device, comprising:
Image acquisition unit 701 is used to obtain bright image and dark image, and the time for exposure of described bright image is greater than the time for exposure of described dark image;
Confidence level acquiring unit 702 is used for obtaining the confidence level of pixel in the confidence level of bright image pixel and the dark image;
Adjustment unit 703 is used for the confidence level according to pixel in the confidence level of the bright image pixel that is obtained and the dark image, adjusts the time for exposure of described bright image or the time for exposure of described dark image.
This device also comprises:
The reference exposure time is provided with unit 704, is used to be provided with reference exposure time T 0;
The time for exposure of image is provided with unit 705, and the time for exposure that is used to be provided with described bright image is r 1* T0, the time for exposure of described dark image is r 2* T0, wherein, r1＞1, r 2＜1.Preferably, r 1=1/r 2
Described adjustment unit 703 is reference exposure time adjustment units, is used for the confidence level according to pixel in the confidence level of the bright image pixel that is obtained and the dark image, adjusts the described reference exposure time.
Wherein, adjustment unit comprises the reference exposure time:
Confidence level pixel parameter acquiring unit 7031 is used for the confidence level according to pixel in the confidence level of the bright image pixel that is obtained and the dark image, obtains the confidence level pixel parameter;
First judging unit 7032 is used to judge that whether described confidence level pixel parameter is greater than first threshold;
Second judging unit 7033 is used to judge that whether described confidence level pixel parameter is less than second threshold value;
Reference exposure time control unit 7034, be used for when the judged result of described first judging unit 7032 when being, reduce the described reference exposure time; When the judged result of described second judging unit 7033 when being, increase the described reference exposure time.
Wherein, described confidence level pixel parameter acquiring unit 7031 comprises:
First kind pixel number acquiring unit 70311, be used to obtain first kind pixel number, described first kind pixel be confidence level sum in bright image more than or equal to the pixel of the confidence level sum in dark image, perhaps the confidence level sum in bright image is less than the pixel of the confidence level sum in dark image;
Confidence level pixel parameter computing unit 70312 is used for obtaining described confidence level pixel parameter according to described first kind pixel number.
Wherein, the confidence level pixel parameter that obtained of described confidence level pixel parameter computing unit 70312 comprises: the ratio of number of total picture element amount in first kind pixel number and described bright image or the dark image.
Perhaps, described first kind pixel is that confidence level sum in bright image is more than or equal to the pixel of the confidence level sum in dark image; This device also comprises: the second class pixel number acquiring unit, be used to obtain the second class pixel number, and the described second class pixel is that confidence level sum in bright image is less than the pixel of the confidence level sum in dark image; At this moment, the confidence level pixel parameter that obtained of described confidence level pixel parameter computing unit 70312 comprises: the ratio of described first kind pixel number and the described second class pixel number.
Consult Fig. 8, the embodiment of the invention six provides a kind of multi-exposure control device, comprising:
Image acquisition unit 801 is used to obtain bright image and dark image, and the time for exposure of described bright image is greater than the time for exposure of described dark image;
Confidence level acquiring unit 802 is used for obtaining the confidence level of pixel in the confidence level of bright image pixel and the dark image;
Adjustment unit 803 is used for the confidence level according to pixel in the confidence level of the bright image pixel that is obtained and the dark image, adjusts the time for exposure of described bright image or the time for exposure of described dark image.
This device also comprises:
The reference exposure time is provided with unit 804, is used to be provided with reference exposure time T 0;
The time for exposure of image is provided with unit 805, and the time for exposure that is used to be provided with described bright image is r 1* T0, the time for exposure of described dark image is r 2* T0, wherein, r1＞1, r 2＜1.Preferably, r 1=1/r 2
Described adjustment unit 803 is reference exposure time adjustment units, is used for the confidence level according to pixel in the confidence level of the bright image pixel that is obtained and the dark image, adjusts the described reference exposure time.
Wherein, adjustment unit comprises the reference exposure time:
Confidence level pixel parameter acquiring unit 8031 is used for the confidence level according to pixel in the confidence level of the bright image pixel that is obtained and the dark image, obtains the confidence level pixel parameter;
First judging unit 8032 is used to judge that whether described confidence level pixel parameter is greater than first threshold;
Second judging unit 8033 is used to judge that whether described confidence level pixel parameter is less than second threshold value;
Reference exposure time control unit 8034, be used for when the judged result of described first judging unit 8032 when being, reduce the described reference exposure time; When the judged result of described second judging unit 8033 when being, increase the described reference exposure time.
Wherein, described confidence level pixel parameter acquiring unit 8031 comprises:
The confidence level sum unit 80311 of pixel in the bright image is used for obtaining the confidence level sum of all bright all pixels of image;
The confidence level sum unit 80312 of pixel in the dark image is used for obtaining the confidence level sum of all dark all pixels of image;
The second class confidence level pixel parameter computing unit 80313, be used to obtain the confidence level pixel parameter, described confidence level pixel parameter comprises: the ratio of the confidence level sum of all pixels in the confidence level sum of all pixels and all dark images of being obtained in the bright image of all that obtained.
As seen from the above analysis, the embodiment of the invention has following beneficial effect:
1, a plurality of image areas that the embodiment of the invention is different with the time for exposure are divided into bright image and dark image, obtain the confidence level of pixel in the confidence level of pixel in the bright image and the dark image, and according to the confidence level of pixel in the confidence level of pixel in the bright image that is obtained and the dark image, adjust the time for exposure of bright image or the time for exposure of dark image, realization utilizes the image of bright image and the synthetic great dynamic range of dark image, and can not influence the resolution of composograph.
2, the embodiment of the invention is adjusted time for exposure of bright image and dark image the reference exposure time by control, has reduced the complexity of algorithm.
More than a kind of multi-exposure control method provided by the present invention and multi-exposure control device are described in detail, for one of ordinary skill in the art, thought according to the embodiment of the invention, part in specific embodiments and applications all can change, in sum, this description should not be construed as limitation of the present invention.

Claims (4)

1. a multi-exposure control method is characterized in that, comprising:
Obtain bright image and dark image; The time for exposure of described bright image is r 1* T0, the time for exposure of described dark image is r 2* T0, wherein, T0 is the reference exposure time, r 1Greater than 1, r 2Less than 1;
Obtain the confidence level of pixel in the confidence level of pixel in the bright image and the dark image;
According to the confidence level of pixel in the confidence level of pixel in the bright image that is obtained and the dark image, adjust the time for exposure of described bright image or the time for exposure of described dark image;
Wherein, described according to pixel in the bright image that is obtained confidence level and dark image in the confidence level of pixel, adjust the time for exposure of described bright image or the time for exposure of described dark image to comprise:
Obtain first kind pixel number, described first kind pixel is that confidence level sum in bright image is less than the pixel of the confidence level sum in dark image; According to described first kind pixel number, obtain described confidence level pixel parameter, described confidence level pixel parameter comprises: the ratio of number of total picture element amount in first kind pixel number and described bright image or the dark image; When described confidence level pixel parameter during, reduce the reference exposure time greater than first threshold; When described confidence level pixel parameter during, increase the reference exposure time less than second threshold value;
Perhaps, obtain the first kind pixel number and the second class pixel number, first kind pixel be confidence level in bright image less than the pixel of the confidence level in the dark image, the second class pixel is that confidence level in bright image is more than or equal to the pixel of the confidence level in the dark image; The ratio that obtains the first kind pixel number and the second class pixel number is as the confidence level pixel parameter; When described confidence level pixel parameter during, reduce the reference exposure time greater than first threshold; When described confidence level pixel parameter during, increase the reference exposure time less than second threshold value;
Perhaps, obtain the confidence level summation of pixel in the bright image; Obtain the confidence level summation of pixel in the dark image; The ratio of the confidence level summation of pixel is as the confidence level pixel parameter in the confidence level summation of asking pixel in the bright image and the dark image; When described confidence level pixel parameter during, reduce the reference exposure time greater than first threshold; When described confidence level pixel parameter during, increase the reference exposure time less than second threshold value.
2. method according to claim 1 is characterized in that,
Described r 1Be r 2Inverse.
3. a multi-exposure control device is characterized in that, comprising:
Image acquisition unit is used to obtain bright image and dark image;
The reference exposure time is provided with the unit, is used to be provided with reference exposure time T 0;
The time for exposure of image is provided with the unit, and the time for exposure that is used to be provided with described bright image is r 1* T0, the time for exposure of described dark image is r 2* T0, wherein r 1Greater than 1, r 2Less than 1;
The confidence level acquiring unit is used for obtaining the confidence level of pixel in the confidence level of bright image pixel and the dark image;
First kind pixel number acquiring unit is used to obtain first kind pixel number, and described first kind pixel is that confidence level sum in bright image is less than the pixel of the confidence level sum in dark image;
Confidence level pixel parameter computing unit is used for obtaining described confidence level pixel parameter according to described first kind pixel number; Wherein, the confidence level pixel parameter that obtained of described confidence level pixel parameter computing unit comprises: the ratio of number of total picture element amount in first kind pixel number and described bright image or the dark image;
First judging unit is used to judge that whether described confidence level pixel parameter is greater than first threshold;
Second judging unit is used to judge that whether described confidence level pixel parameter is less than second threshold value;
The reference exposure time control unit, be used for when the judged result of described first judging unit when being, reduce the described reference exposure time; When the judged result of described second judging unit when being, increase the described reference exposure time.
4. a multi-exposure control device is characterized in that, comprising:
Image acquisition unit is used to obtain bright image and dark image;
The reference exposure time is provided with the unit, is used to be provided with reference exposure time T 0;
The time for exposure of image is provided with the unit, and the time for exposure that is used to be provided with described bright image is r 1* T0, the time for exposure of described dark image is r 2* T0, wherein r 1Greater than 1, r 2Less than 1;
The confidence level acquiring unit is used for obtaining the confidence level of pixel in the confidence level of bright image pixel and the dark image;
The confidence level sum unit of pixel in the bright image is used for obtaining the confidence level sum of all bright all pixels of image;
The confidence level sum unit of pixel in the dark image is used for obtaining the confidence level sum of all dark all pixels of image;
The second class confidence level pixel parameter computing unit, be used to obtain the confidence level pixel parameter, described confidence level pixel parameter comprises: the ratio of the confidence level sum of all pixels in the confidence level sum of all pixels and all dark images of being obtained in the bright image of all that obtained;
First judging unit is used to judge that whether described confidence level pixel parameter is greater than first threshold;
Second judging unit is used to judge that whether described confidence level pixel parameter is less than second threshold value;
The reference exposure time control unit, be used for when the judged result of described first judging unit when being, reduce the described reference exposure time; When the judged result of described second judging unit when being, increase the described reference exposure time.
CN2007103050835A 2007-12-27 2007-12-27 Multi-exposure control method and multi-exposure control device Expired - Fee Related CN101197942B (en)

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