CN102857727A - Lossless compression and decompression processing method for video data - Google Patents
Lossless compression and decompression processing method for video data Download PDFInfo
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- CN102857727A CN102857727A CN2012103843062A CN201210384306A CN102857727A CN 102857727 A CN102857727 A CN 102857727A CN 2012103843062 A CN2012103843062 A CN 2012103843062A CN 201210384306 A CN201210384306 A CN 201210384306A CN 102857727 A CN102857727 A CN 102857727A
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Abstract
The invention discloses a lossless compression and decompression processing method for video data. In a compression process of the method, a difference frame is obtained according to a target image and a key frame image; in a decompression process, the target image can be quickly reconstructed; furthermore, the change degree of the image can be monitored in real time, and a key frame can be updated timely; and therefore, during subsequent difference frame compression, relatively high compression ratio can be obtained.
Description
Technical field
The present invention relates to the application software technology of computer science, especially a kind of Lossless Compression of improved video data and decompression process.
Background technology
In the air traffic control system, provide the videograph of lossless manner and videograph and the repeatability that playback mechanism, realization controller operate the seat, very important to the safety that improves air traffic.And unaffected for the operation that guarantees the controlling officer, this function should reduce the consumption to the host performance resource as far as possible.
At present, under X Window environment, the method for videograph and playback is less, and is lossy compression method mostly, and operational efficiency is not high, and is larger on the impact of main frame runnability.
So, need a kind of new technical scheme to address the above problem.
Summary of the invention
The objective of the invention is the deficiency for the prior art existence, a kind of Lossless Compression and the decompression process that can realize video data is provided.
For achieving the above object, the Lossless Compression of video data of the present invention and decompression process can adopt following technical scheme:
A kind of Lossless Compression of video data and decompression process,
The method of vedio data Lossless Compression is:
(1a), input raw image data;
(2a), judge whether to exist key frame images origK, if it is execution in step (3a), otherwise execution in step (10a);
(3a), original image and key frame origK carried out XOR process, obtain difference frame origD;
(4a), difference frame is carried out LZF compression, obtain data block lzfD, its size is sizeD;
(5a), calculate the ratio of the sizeK of acquisition in sizeD and the step (11a), obtain diversity factor R;
(6a), whether comparing difference degree R greater than default threshold value T, if satisfy then execution in step (10a), otherwise execution in step (7a);
(7a), data block lzfD is carried out zlib compression, obtain data block zipD;
(8a), data block zipD is encapsulated, and write storage device;
(9a), jump to step (14a);
(10a), original image being kept in is key frame origK;
(11a), key frame origK is carried out LZF compression, obtain data block lzfK, size is sizeK;
(12a), data block lzfK is carried out zlib compression, obtain data block zipK;
(13a), with data block zipK encapsulation, and write storage device;
(14a), prepare to process the next frame view data;
The method of the decompression of the above-mentioned vedio data that had compressed is:
(1b), read the image frame data of compression by memory device;
(2b), judge whether image frame data is the key frame packed data, if satisfy then execution in step (3b), otherwise execution in step (5b);
(3b), the image frame data piece carried out successively zlib decompresses and LZF decompresses, obtain original key frame images imageK, and upgrade buffer memory;
(4b), output image imageK, jump to step (8b);
(5b), the image frame data piece is carried out zlib decompression and LZF decompression successively, acquisition original differences frame data cacheD;
(6b), the key frame images imageK of data block cacheD and buffer memory is carried out XOR, obtain image imageX;
(7b), output image imageX;
(8b), prepare to process the next frame view data.。
Compare with background technology, the Lossless Compression of video data of the present invention and decompression process be because be to obtain difference frame according to target image and key frame images in the compression process, so in the decompression process, can the Fast Reconstruction target image; And, the intensity of variation of Real-Time Monitoring image, the key frame that upgrades in time obtains higher compression ratio when guaranteeing follow-up difference frame compression.
Description of drawings
Fig. 1 is the flow chart that video image data compression is processed among the present invention.
Fig. 2 is the flow chart of vedio data decompression among the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand these embodiment only is used for explanation the present invention and is not used in and limits the scope of the invention, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.
See also Figure 1 and Figure 2, the present invention discloses a kind of Lossless Compression and decompression process of video data.Wherein,
The method of vedio data Lossless Compression is:
(1a), input raw image data;
(2a), judge whether to exist key frame images origK, if it is execution in step (3a), otherwise execution in step (10a);
(3a), original image and key frame origK carried out XOR process, obtain difference frame origD;
(4a), difference frame is carried out LZF compression, obtain data block lzfD, its size is sizeD;
(5a), calculate the ratio of the sizeK of acquisition in sizeD and the step (11a), obtain diversity factor R;
(6a), whether comparing difference degree R greater than default threshold value T, if satisfy then execution in step (10a), otherwise execution in step (7a);
(7a), data block lzfD is carried out zlib compression, obtain data block zipD;
(8a), data block zipD is encapsulated, and write storage device;
(9a), jump to step (14a);
(10a), original image being kept in is key frame origK;
(11a), key frame origK is carried out LZF compression, obtain data block lzfK, size is sizeK;
(12a), data block lzfK is carried out zlib compression, obtain data block zipK;
(13a), with data block zipK encapsulation, and write storage device;
(14a), prepare to process the next frame view data.
The method of the decompression of the above-mentioned vedio data that had compressed is:
(1b), read the image frame data of compression by memory device;
(2b), judge whether image frame data is the key frame packed data, if satisfy then execution in step (3b), otherwise execution in step (5b);
(3b), the image frame data piece carried out successively zlib decompresses and LZF decompresses, obtain original key frame images imageK, and upgrade buffer memory;
(4b), output image imageK, jump to step (8b);
(5b), the image frame data piece is carried out zlib decompression and LZF decompression successively, acquisition original differences frame data cacheD;
(6b), the key frame images imageK of data block cacheD and buffer memory is carried out XOR, obtain image imageX;
(7b), output image imageX;
(8b), prepare to process the next frame view data.
Key point of the present invention is:
By the combination of several different methods, guarantee the high efficiency of compression and decompression processing procedure, the size of the data file that reduces to generate, and guarantee to carry out quick playback.
Twice compress mode namely at first reduces the data block size by Fast Compression algorithm (for example LZF), and the algorithm (for example zlib) by high compression ratio further improves compression ratio again.Like this, can between compression speed and compression ratio, average out;
In the compression process, picture frame and key frame are carried out XOR process to obtain difference frame.Like this, in the decompression process, only need to obtain difference frame and the corresponding key frame of target image, just can rebuild original image;
In the compression process, according to the size of difference frame and key frame, calculate to obtain the diversity factor of present image and key frame images, and with threshold ratio, whether need to upgrade key frame with decision.Like this, when video image changes when violent, the key frame that can upgrade in time guarantees that the difference frame that subsequent treatment obtains keeps less size.
Claims (1)
1. the Lossless Compression of a video data and decompression process is characterized in that:
The method of vedio data Lossless Compression is:
(1a), input raw image data;
(2a), judge whether to exist key frame images origK, if it is execution in step (3a), otherwise execution in step (10a);
(3a), original image and key frame origK carried out XOR process, obtain difference frame origD;
(4a), difference frame is carried out LZF compression, obtain data block lzfD, its size is sizeD;
(5a), calculate the ratio of the sizeK of acquisition in sizeD and the step (11a), obtain diversity factor R;
(6a), whether comparing difference degree R greater than default threshold value T, if satisfy then execution in step (10a), otherwise execution in step (7a);
(7a), data block lzfD is carried out zlib compression, obtain data block zipD;
(8a), data block zipD is encapsulated, and write storage device;
(9a), jump to step (14a);
(10a), original image being kept in is key frame origK;
(11a), key frame origK is carried out LZF compression, obtain data block lzfK, size is sizeK;
(12a), data block lzfK is carried out zlib compression, obtain data block zipK;
(13a), with data block zipK encapsulation, and write storage device;
(14a), prepare to process the next frame view data;
The method of the decompression of the above-mentioned vedio data that had compressed is:
(1b), read the image frame data of compression by memory device;
(2b), judge whether image frame data is the key frame packed data, if satisfy then execution in step (3b), otherwise execution in step (5b);
(3b), the image frame data piece carried out successively zlib decompresses and LZF decompresses, obtain original key frame images imageK, and upgrade buffer memory;
(4b), output image imageK, jump to step (8b);
(5b), the image frame data piece is carried out zlib decompression and LZF decompression successively, acquisition original differences frame data cacheD;
(6b), the key frame images imageK of data block cacheD and buffer memory is carried out XOR, obtain image imageX;
(7b), output image imageX;
(8b), prepare to process the next frame view data.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110611509A (en) * | 2019-08-16 | 2019-12-24 | 宁海县雁苍山电力建设有限公司 | Infrared temperature data compression method and system |
| CN112241005A (en) * | 2019-07-19 | 2021-01-19 | 杭州海康威视数字技术股份有限公司 | Method and device for compressing radar detection data and storage medium |
| CN116229870A (en) * | 2023-05-10 | 2023-06-06 | 苏州华兴源创科技股份有限公司 | Compensation data compression and decompression method and display panel compensation method |
| CN117319676A (en) * | 2023-11-28 | 2023-12-29 | 苏州元脑智能科技有限公司 | Video compression device, chip, system and method |
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| US20040156549A1 (en) * | 1998-10-01 | 2004-08-12 | Cirrus Logic, Inc. | Feedback scheme for video compression system |
| JP2005045588A (en) * | 2003-07-23 | 2005-02-17 | Shuji Okuno | Method and device for compressing still image and moving image and storage medium |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112241005A (en) * | 2019-07-19 | 2021-01-19 | 杭州海康威视数字技术股份有限公司 | Method and device for compressing radar detection data and storage medium |
| CN110611509A (en) * | 2019-08-16 | 2019-12-24 | 宁海县雁苍山电力建设有限公司 | Infrared temperature data compression method and system |
| CN110611509B (en) * | 2019-08-16 | 2023-12-29 | 宁海县雁苍山电力建设有限公司 | Infrared temperature data compression method and system |
| CN116229870A (en) * | 2023-05-10 | 2023-06-06 | 苏州华兴源创科技股份有限公司 | Compensation data compression and decompression method and display panel compensation method |
| CN116229870B (en) * | 2023-05-10 | 2023-08-15 | 苏州华兴源创科技股份有限公司 | Compensation data compression and decompression method and display panel compensation method |
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| CN117319676B (en) * | 2023-11-28 | 2024-02-23 | 苏州元脑智能科技有限公司 | Video compression device, chip, system and method |
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