CN104053009A - Encoding method of monitoring video and device - Google Patents
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Abstract
The invention discloses an encoding method of a monitoring video and a device. The method comprises the steps of calculating the residual area ratio of a current interframe coding frame and a previous frame when the current interframe coding frame is an interframe coding frame, comparing the calculated residual area ratio with a preset first threshold, if the calculated residual area ratio is smaller than the first threshold, using an interframe omission mode to calculate an residual image on the current interframe coding frame, quantifying the calculated residual image to obtain a quantized residual, and using the quantized residual to carry out entropy coding to obtain a code stream. According to the method and the device, when the monitoring video is encoded, when the residual area ratio of the current interframe coding frame and the previous frame is smaller than the first threshold, the interframe omission mode is used to calculate the residual image on the current interframe coding frame, and the calculated residual image is subjected to quantifying and entropy coding to obtain the code stream. While the coding quality is ensured, the code complexity is reduced, the coding time is saved, and the coding efficiency is improved.
Description
Technical field
The application relates to field of video encoding, relates in particular to a kind of coding method and device of monitor video.
Background technology
Video monitoring apparatus, as a pith of safety system, is widely used in a lot of fields.The video encoding standard that the video monitoring apparatus of producing due to different manufacturers adopts is different, has caused the differentiation of video quality.Due to the particularity of monitoring photographed scene, make to take the video forming and there is the feature different from ordinary video.Monitor video is with respect to ordinary video, and the background of video does not often change, and just has once in a while minority goal activities.
Feature based on monitor video, adopts original method for video coding to encode to monitor video at present, has caused the code efficiency redundancy of monitor video.
Summary of the invention
The technical problem that the application will solve is to provide a kind of coding method and device of monitor video, can improve the code efficiency of monitor video.
For solving the problems of the technologies described above, the coding method of a kind of monitor video of the present invention, comprising:
When current encoded frame is inter-frame encoding frame, calculate the residual error region rate of current inter-frame encoding frame and previous frame, the residual error region rate calculating and preset the first thresholding are compared, if the residual error region rate calculating is less than the first thresholding, adopt interframe to omit pattern current inter-frame encoding frame is calculated to residual image, the residual image calculating is quantized, obtain quantizing residual error, adopt the quantification residual error obtaining to carry out entropy coding and obtain encoding stream.
The quantification residual error of each pixel that further, described quantification residual error comprises current inter-frame encoding frame;
After current inter-frame encoding frame is quantized, also current inter-frame encoding frame is rebuild, comprise: the quantification residual error of each pixel of described current inter-frame encoding frame is added with the pixel value of the respective pixel of the reconstruction image of previous frame respectively, obtains the reconstruction image of current inter-frame encoding frame.
Further, calculate the residual error region rate of current inter-frame encoding frame and previous frame, comprising:
The pixel value of each pixel of current inter-frame encoding frame is deducted to the pixel value of the respective pixel of previous frame, obtain the pixel residual error of each pixel of current inter-frame encoding frame;
Calculating pixel residual error is greater than the quantity of the pixel of the second thresholding, the pixel residual error calculating is greater than to the quantity of pixel of the second thresholding divided by the total pixel number amount of current inter-frame encoding frame, obtains the residual error region rate of current inter-frame encoding frame and previous frame.
Further, also comprise:
After obtaining encoding stream, encoding stream is sent to decoding end, and send coded system indication information to decoding end, to described decoding end, indicating described encoding stream is to adopt interframe to omit pattern current inter-frame encoding frame is calculated to residual image, the residual image calculating is quantized, obtain quantizing residual error, adopt the quantification residual error obtaining to carry out entropy and encode resulting.
Further, also comprise:
If the residual error region rate calculating is more than or equal to the first thresholding, described current inter-frame encoding frame is carried out to inter prediction, discrete cosine transform, quantification and entropy coding and obtain encoding stream.
Further, a kind of code device of monitor video, comprising: computing unit, comparing unit and coding unit, wherein:
Described computing unit, for when current encoded frame is inter-frame encoding frame, calculates the residual error region rate of current inter-frame encoding frame and previous frame;
Described comparing unit, compares for residual error region rate that described computing unit is calculated and the first preset thresholding;
Described coding unit, for when described comparing unit determines that residual error region rate is less than the first thresholding, adopt interframe to omit pattern current inter-frame encoding frame is calculated to residual image, the residual image calculating is quantized, obtain quantizing residual error, adopt the quantification residual error obtaining to carry out entropy coding and obtain encoding stream.
Further, also comprise image reconstruction unit, wherein:
The quantification residual error of each pixel that described quantification residual error comprises current inter-frame encoding frame;
Described image reconstruction unit, for after described coding unit quantizes current inter-frame encoding frame, current inter-frame encoding frame is rebuild, comprise: the quantification residual error of each pixel of described current inter-frame encoding frame is added with the pixel value of the respective pixel of the reconstruction image of previous frame respectively, obtains the reconstruction image of current inter-frame encoding frame.
Further, described computing unit, specifically for the pixel value of each pixel of current inter-frame encoding frame being deducted to the pixel value of the respective pixel of previous frame, obtains the pixel residual error of each pixel of current inter-frame encoding frame; Calculating pixel residual error is greater than the quantity of the pixel of the second thresholding, the pixel residual error calculating is greater than to the quantity of pixel of the second thresholding divided by the total pixel number amount of current inter-frame encoding frame, obtains the residual error region rate of current inter-frame encoding frame and previous frame.
Further, also comprise transmitting element, wherein:
Described transmitting element, for encoding stream being sent to decoding end after described coding unit obtains encoding stream, and send coded system indication information to decoding end, to described decoding end, indicating described encoding stream is to adopt interframe to omit pattern current inter-frame encoding frame is calculated to residual image, the residual image calculating is quantized, obtain quantizing residual error, adopt the quantification residual error obtaining to carry out entropy and encode resulting.
Further, described coding unit, also for when described comparing unit determines that residual error region rate is more than or equal to the first thresholding, carries out inter prediction, discrete cosine transform, quantification and entropy coding to described current inter-frame encoding frame and obtains encoding stream.
In sum, when the application encodes to monitor video, when the residual error region rate of current inter-frame encoding frame and previous frame is less than the first thresholding, adopt interframe to omit pattern current inter-frame encoding frame is calculated to residual image, the residual image calculating is quantized to obtain encoding stream with entropy coding, when guaranteeing coding quality, reduced encoder complexity, save the scramble time, improved code efficiency.
Accompanying drawing explanation
Fig. 1 is the flow chart of coding method of the monitor video of the application's execution mode;
Fig. 2 is the flow chart of method of the residual error region rate of the current inter-frame encoding frame of the calculating in the application's execution mode and previous frame;
Fig. 3 is the Organization Chart of code device of the monitor video of the application's execution mode.
Embodiment
In the process that monitor video is encoded, for inter-frame encoding frame, while predicting between conducting frame, can travel through all possible predictive mode to select the pattern of the residual image of calculating inter-frame encoding frame, this can consume a large amount of scramble times.Present embodiment determines in current inter-frame encoding frame, whether there is large moving target by calculating the residual error region rate of current inter-frame encoding frame and previous frame, when the residual error region rate of current inter-frame encoding frame and previous frame is less than the first thresholding, directly adopt interframe to omit pattern (SkipMode, SM) calculate the residual image of inter-frame encoding frame, and no longer travel through the pattern that all possible predictive mode selects to calculate the residual image of inter-frame encoding frame, directly adopt in this case interframe to omit the residual image of mode computation inter-frame encoding frame, not only can meet the requirement of coding quality, and can save a large amount of scramble times, improved greatly code efficiency, and,
In present embodiment, consider while there is not large moving target in current inter-frame encoding frame, if still carry out discrete cosine transform (DCT) in cataloged procedure, not only cannot improve coding quality, and the scramble time can be wasted, therefore, in present embodiment, when the residual error region rate of current inter-frame encoding frame and previous frame is less than the first thresholding, no longer carry out DCT, not only reduce the expense of encoding, and can save the scramble time.
In present embodiment, when the residual error region rate of current inter-frame encoding frame and previous frame is more than or equal to the first thresholding, adopt original method for video coding, that is: current inter-frame encoding frame is carried out to inter prediction, DCT, quantification and entropy coding, obtain encoding stream.
Hereinafter with reference to accompanying drawing, also describe the present invention in detail in conjunction with the embodiments.It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.
Take below H.264 and the video encoding standard of high-performance video coding (HEVC) is example, as shown in Figure 1, the coding method of the monitor video of present embodiment, comprising:
Step 101: determine the type of current encoded frame, when current encoded frame is intracoded frame, execution step 102; When current encoded frame is inter-frame encoding frame, execution step 103;
Step 102: if current encoded frame is intracoded frame, adopt original video coding method to encode to current intraframe coding;
Original video coding method, comprising: carry out infra-frame prediction, discrete cosine transform (DCT), quantification and entropy coding and obtain encoding stream, and code stream is sent to decoding end.When coding side is rebuild, by the quantification residual error that quantizes to obtain, carry out inverse quantization and inverse discrete cosine transformation (IDCT), then resolve according to the method for infra-frame prediction, obtain the reconstruction image of intracoded frame.
Step 103: if current encoded frame is inter-frame encoding frame, calculate the residual error region rate of the reconstruction image of current inter-frame encoding frame and previous frame;
Residual error region rate is for embodying the parameter of image similarity.In current inter-frame encoding frame and previous frame similarity when higher, can determine and in current inter-frame encoding frame, not have large moving target; When the similarity of current inter-frame encoding frame and previous frame is lower, can determines and in current inter-frame encoding frame, have large moving target.
As shown in Figure 2, calculate the method for residual error region rate, comprising:
Step 201: the pixel value of each pixel of current inter-frame encoding frame is deducted to the pixel value of the respective pixel of previous frame, obtain the pixel residual error of each pixel of current inter-frame encoding frame;
Step 202: calculating pixel residual error is greater than the quantity of the pixel of the second thresholding;
Step 203: the pixel residual error calculating is greater than to the quantity of pixel of the second thresholding divided by the total pixel number amount of current inter-frame encoding frame, obtains the residual error region rate of current inter-frame encoding frame and previous frame.
Step 104: whether the residual error region rate that judgement calculates is less than the first pre-configured thresholding, if be less than, performs step 105; Otherwise, execution step 107;
Step 105: adopt interframe to omit pattern current inter-frame encoding frame is calculated to residual image, the residual image calculating is quantized, obtain quantizing residual error, adopt the quantification residual error obtaining to carry out entropy coding and obtain encoding stream, and encoding stream is sent to decoding end;
When encoding stream is sent to decoding end, transmission coded system indication information for example " 0 " arrives decoding end, to decoding end indication encoding stream, be to adopt interframe to omit mode computation residual image, residual image is quantized, obtain quantizing residual error, it is resulting that employing quantification residual error is carried out entropy coding, is beneficial to decoding end and decodes.
Step 106: when coding side is rebuild current inter-frame encoding frame, the quantification residual error of each pixel in the quantification residual error of current inter-frame encoding frame is added with the pixel value of the respective pixel of the reconstruction image of previous frame respectively, obtain the reconstruction image of current inter-frame encoding frame, finish;
Step 107: adopt original video coding method to encode to current inter-frame encoding frame;
Adopt original video coding method that current inter-frame encoding frame is encoded and comprised: to carry out inter prediction, travel through all possible predictive mode, select the pattern of the residual image of the current inter-frame encoding frame of calculating, calculate the residual image of current inter-frame encoding frame, residual image is carried out discrete cosine transform (DCT) and quantized, adopt the quantification residual error that quantizes to obtain to carry out entropy coding and obtain encoding stream, and encoding stream is sent to decoding end, send coded system indication information simultaneously, for example " 1 " is to decoding end, the coded system adopting to decoding end indication encoding stream, being beneficial to decoding end decodes according to inter prediction.
When coding side is rebuild current inter-frame encoding frame, by the quantification residual error that quantizes to obtain, carry out inverse quantization and inverse discrete cosine transformation (IDCT), then resolve according to the method for inter prediction, finally obtain the reconstruction image of current inter-frame encoding frame.
Present embodiment does not often change for the background of monitor video, the characteristic that has once in a while minority goal activities, greatly improved the code efficiency of monitor video, above with video encoding standard and high-performance video coding (High Efficiency Video Coding H.264, HEVC) video encoding standard is example, but is not limited to this herein.
As shown in Figure 3, present embodiment also provides a kind of code device of monitor video, comprising: computing unit, comparing unit and coding unit, wherein:
Computing unit, for when current encoded frame is inter-frame encoding frame, calculates the residual error region rate of current inter-frame encoding frame and previous frame;
Comparing unit, compares for residual error region rate that computing unit is calculated and the first preset thresholding;
Coding unit, for when comparing unit determines that residual error region rate is less than the first thresholding, adopt interframe to omit pattern current inter-frame encoding frame is calculated to residual image, the residual image calculating is quantized, obtain quantizing residual error, adopt the quantification residual error obtaining to carry out entropy coding and obtain encoding stream.
Further, also comprise image reconstruction unit, wherein:
The quantification residual error of each pixel that quantification residual error comprises current inter-frame encoding frame;
Image reconstruction unit, for after coding unit quantizes current inter-frame encoding frame, current inter-frame encoding frame is rebuild, comprise: the quantification residual error of each pixel of current inter-frame encoding frame is added with the pixel value of the respective pixel of the reconstruction image of previous frame respectively, obtains the reconstruction image of current inter-frame encoding frame.
Further, computing unit, specifically for the pixel value of each pixel of current inter-frame encoding frame being deducted to the pixel value of the respective pixel of previous frame, obtains the pixel residual error of each pixel of current inter-frame encoding frame; Calculating pixel residual error is greater than the quantity of the pixel of the second thresholding, the pixel residual error calculating is greater than to the quantity of pixel of the second thresholding divided by the total pixel number amount of current inter-frame encoding frame, obtains the residual error region rate of current inter-frame encoding frame and previous frame.
Further, also comprise transmitting element, wherein:
Transmitting element, for encoding stream being sent to decoding end after coding unit obtains encoding stream, and send coded system indication information to decoding end, to decoding end indication encoding stream, be to adopt interframe to omit pattern current inter-frame encoding frame is calculated to residual image, the residual image calculating is quantized, obtain quantizing residual error, adopt the quantification residual error obtaining to carry out entropy and encode resulting.
Further, coding unit, also when determining that at comparing unit residual error region rate is more than or equal to the first thresholding, carries out inter prediction, discrete cosine transform, quantification and entropy coding to current inter-frame encoding frame and obtains encoding stream.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, and in some cases, can carry out shown or described step with the order being different from herein, or they are made into respectively to each integrated circuit modules, or a plurality of modules in them or step are made into single integrated circuit module to be realized.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a coding method for monitor video, comprising:
When current encoded frame is inter-frame encoding frame, calculate the residual error region rate of current inter-frame encoding frame and previous frame, the residual error region rate calculating and preset the first thresholding are compared, if the residual error region rate calculating is less than the first thresholding, adopt interframe to omit pattern current inter-frame encoding frame is calculated to residual image, the residual image calculating is quantized, obtain quantizing residual error, adopt the quantification residual error obtaining to carry out entropy coding and obtain encoding stream.
2. the method for claim 1, is characterized in that:
The quantification residual error of each pixel that described quantification residual error comprises current inter-frame encoding frame;
After current inter-frame encoding frame is quantized, also current inter-frame encoding frame is rebuild, comprise: the quantification residual error of each pixel of described current inter-frame encoding frame is added with the pixel value of the respective pixel of the reconstruction image of previous frame respectively, obtains the reconstruction image of current inter-frame encoding frame.
3. method as claimed in claim 1 or 2, is characterized in that, calculates the residual error region rate of current inter-frame encoding frame and previous frame, comprising:
The pixel value of each pixel of current inter-frame encoding frame is deducted to the pixel value of the respective pixel of previous frame, obtain the pixel residual error of each pixel of current inter-frame encoding frame;
Calculating pixel residual error is greater than the quantity of the pixel of the second thresholding, the pixel residual error calculating is greater than to the quantity of pixel of the second thresholding divided by the total pixel number amount of current inter-frame encoding frame, obtains the residual error region rate of current inter-frame encoding frame and previous frame.
4. method as claimed in claim 1 or 2, is characterized in that, also comprises:
After obtaining encoding stream, encoding stream is sent to decoding end, and send coded system indication information to decoding end, to described decoding end, indicating described encoding stream is to adopt interframe to omit pattern current inter-frame encoding frame is calculated to residual image, the residual image calculating is quantized, obtain quantizing residual error, adopt the quantification residual error obtaining to carry out entropy and encode resulting.
5. method as claimed in claim 1 or 2, is characterized in that, also comprises:
If the residual error region rate calculating is more than or equal to the first thresholding, described current inter-frame encoding frame is carried out to inter prediction, discrete cosine transform, quantification and entropy coding and obtain encoding stream.
6. a code device for monitor video, comprising: computing unit, comparing unit and coding unit, wherein:
Described computing unit, for when current encoded frame is inter-frame encoding frame, calculates the residual error region rate of current inter-frame encoding frame and previous frame;
Described comparing unit, compares for residual error region rate that described computing unit is calculated and the first preset thresholding;
Described coding unit, for when described comparing unit determines that residual error region rate is less than the first thresholding, adopt interframe to omit pattern current inter-frame encoding frame is calculated to residual image, the residual image calculating is quantized, obtain quantizing residual error, adopt the quantification residual error obtaining to carry out entropy coding and obtain encoding stream.
7. device as claimed in claim 6, is characterized in that, also comprises image reconstruction unit, wherein:
The quantification residual error of each pixel that described quantification residual error comprises current inter-frame encoding frame;
Described image reconstruction unit, for after described coding unit quantizes current inter-frame encoding frame, current inter-frame encoding frame is rebuild, comprise: the quantification residual error of each pixel of described current inter-frame encoding frame is added with the pixel value of the respective pixel of the reconstruction image of previous frame respectively, obtains the reconstruction image of current inter-frame encoding frame.
8. the device as described in claim 6 or 7, is characterized in that:
Described computing unit, specifically for the pixel value of each pixel of current inter-frame encoding frame being deducted to the pixel value of the respective pixel of previous frame, obtains the pixel residual error of each pixel of current inter-frame encoding frame; Calculating pixel residual error is greater than the quantity of the pixel of the second thresholding, the pixel residual error calculating is greater than to the quantity of pixel of the second thresholding divided by the total pixel number amount of current inter-frame encoding frame, obtains the residual error region rate of current inter-frame encoding frame and previous frame.
9. the device as described in claim 6 or 7, is characterized in that, also comprises transmitting element, wherein:
Described transmitting element, for encoding stream being sent to decoding end after described coding unit obtains encoding stream, and send coded system indication information to decoding end, to described decoding end, indicating described encoding stream is to adopt interframe to omit pattern current inter-frame encoding frame is calculated to residual image, the residual image calculating is quantized, obtain quantizing residual error, adopt the quantification residual error obtaining to carry out entropy and encode resulting.
10. the device as described in claim 6 or 7, is characterized in that:
Described coding unit, also for when described comparing unit determines that residual error region rate is more than or equal to the first thresholding, carries out inter prediction, discrete cosine transform, quantification and entropy coding to described current inter-frame encoding frame and obtains encoding stream.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106534871A (en) * | 2016-12-06 | 2017-03-22 | 北京大学 | Coding method and decoding method for video codec |
| CN106559632A (en) * | 2015-09-30 | 2017-04-05 | 杭州萤石网络有限公司 | A kind of storage method and device of multimedia file |
| CN112866695A (en) * | 2021-01-07 | 2021-05-28 | 上海富瀚微电子股份有限公司 | Video encoder |
| WO2022217610A1 (en) * | 2021-04-16 | 2022-10-20 | Oppo广东移动通信有限公司 | Residual coding method and device, video coding method and device, and storage medium |
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2013
- 2013-03-15 CN CN201310082793.1A patent/CN104053009A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106559632A (en) * | 2015-09-30 | 2017-04-05 | 杭州萤石网络有限公司 | A kind of storage method and device of multimedia file |
| CN106534871A (en) * | 2016-12-06 | 2017-03-22 | 北京大学 | Coding method and decoding method for video codec |
| CN106534871B (en) * | 2016-12-06 | 2019-06-07 | 北京大学 | The coding method of Video Codec and coding/decoding method |
| CN112866695A (en) * | 2021-01-07 | 2021-05-28 | 上海富瀚微电子股份有限公司 | Video encoder |
| WO2022217610A1 (en) * | 2021-04-16 | 2022-10-20 | Oppo广东移动通信有限公司 | Residual coding method and device, video coding method and device, and storage medium |
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Application publication date: 20140917 |