CN101860757A - Intelligent monitoring system and method for encoding and decoding images thereof - Google Patents
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Abstract
The invention provides an intelligent monitoring system and a method for encoding and decoding images thereof. The method comprises the following steps of: acquiring description parameters of moving targets by using an intelligent monitoring module; determining the targets which need differential treatment through the parameters; encoding the targets which need differential treatment differently so as to perform differential treatment; and decoding the targets which need differential treatment and outputting the images. In the method, the targets which need differential treatment are encoded differently and the quality of the whole image does not need to be guaranteed, so that the requirements of a user can be guaranteed under the condition of low code rate.
Description
[technical field]
The present invention relates to the electronic monitoring field, particularly about a kind of intelligent monitor system and decoding method thereof.
[background technology]
Along with socio-economic development increases, the good living environment of society is set up, and people recognize that gradually safety precaution is an indispensable part in the life.The supervisory control system construction develops into every field such as current public place, heavy construction, finance, traffic by guard key target, the key departments at initial stage, even has moved towards family.Built each class hierarchy crime prevention system, more than 400,000,000 yuan of direct economic loss retrieved in annual prevention and crack more than 10,000 of all kinds of case, brought into play huge effect aspect the property safety ensureing that the social public security and the people state.
In the supervisory control system, the quality of video image quality is extremely important for the object of differentiating the monitoring area in the monitored picture.And in some supervisory control system, possible user is the zone that the moving target motion is arranged to the special zone of being concerned about of video quality, and the changeless background area of picture is not then needed the very high monitored picture of video quality.
For example in the supervisory control system of monitoring road, require to have very high video quality for the road area that the motion of people or car is arranged, can tell people's face in the supervisory control system or number-plate number etc., and for trees, the building of road both sides or be parked in background area such as the fixed automobile in there, even if then video image some is fuzzy also unimportant.
Yet, the moving target and the difference of fixed background image that are difficult in the existing video coding position in the video image is constantly changed are come, if guarantee the video quality of user's region-of-interest, because region-of-interest and non-region-of-interest can't be treated with a certain discrimination, it can only be the quality that guarantees general image, so originally, do not need the very yet necessary precision encoding in background area of exact image, cause bit stream data relatively large, that is to say the demand that guarantees the user under the situation that is difficult in low code check.
[summary of the invention]
The object of the present invention is to provide the method for image coding and decoding in a kind of intelligent monitor system.
Another object of the present invention is to provide a kind of intelligent monitor system of optimizing image coding/decoding method that adopts.
For reaching aforementioned purpose, the method for image coding and decoding in a kind of intelligent monitor system of the present invention, it comprises:
Obtain the characterising parameter of moving target in every frame;
Determine the target area that needs to be treated differently according to the characterising parameter of described moving target;
Different coding is carried out so that described target area and other zone are treated with a certain discrimination in the described target area that needs to be treated differently;
Every two field picture is decoded with output image.
Further, the characterising parameter that wherein obtains moving target in every frame comprises the boundary rectangle of moving target and the mask of moving target, and described characterising parameter according to moving target determines that the target area that needs to be treated differently comprises:
Boundary rectangle according to described moving target obtains the cell block that intersects with described moving target;
Mask according to described moving target obtains the cell block that intersects with described moving target;
If the cell block that intersects with described moving target that obtains according to the mask of described moving target obtains the cell block that intersects with described moving target half less than the boundary rectangle according to described moving target, encode in the position of the cell block that intersects with described moving target that then will obtain according to the mask of described moving target, described mask according to described moving target obtains the cell block that intersects with described moving target and is the target area that needs to be treated differently; Do not belong to the cell block that mask according to described moving target obtains the cell block that intersects with described moving target and encode otherwise will obtain the cell block that intersects with described moving target, and be denoted as background according to the boundary rectangle of described moving target.
Further, the characterising parameter that wherein obtains moving target in every frame comprises the type of alarm grade of moving target or the attention rate of image-region of living in, and described characterising parameter according to moving target determines that the target area that needs to be treated differently comprises: trigger different the warning at moving target through zones of different and determine when being provided with that described moving target is the target area that needs to be treated differently.
Further, wherein different coding being carried out in the described target area that needs to be treated differently comprises so that described target area is treated with a certain discrimination with other zone: for the corresponding higher bit rate of other cell blocks of cell block distribution ratio of the target mask that needs to be treated differently.
Further, wherein different coding being carried out in the described target area that needs to be treated differently comprises so that described target area and other zone are treated with a certain discrimination: carry out lossless coding and encode for the target area that needs to be treated differently for described motion target area characterising parameter, at interval predetermined frame or just background is encoded when background changes.
Further, wherein different coding being carried out in the described target area that needs to be treated differently comprises so that described target area is treated with a certain discrimination with other zone: carry out lossless coding and strengthen coding for the corresponding cell block of the target mask that needs to be treated differently and the lossless coding of described motion target area characterising parameter for described motion target area characterising parameter.
Further, wherein every two field picture is decoded and comprises with output image:
If present frame be a background frames decode the back background image updating;
The motion target area characterising parameter of decoding present image, the position of the boundary rectangle of each target area that obtains according to decoding back and each cell block that the decoding of the moving target mask corresponding unit piece that needs to be treated differently is obtained needing to be treated differently;
Decode the image of each cell block to units corresponding piece position;
Decoded target area and background image are merged.
For reaching aforementioned purpose, a kind of intelligent monitor system of the present invention, it comprises:
The moving object detection unit, it detects the characterising parameter of moving target;
Treat the target area identifying unit with a certain discrimination, it judges according to the moving target characterising parameter that described moving object detection unit obtains whether moving target is the target that needs to be treated differently;
Coding unit according to treating the result that the target area identifying unit is judged with a certain discrimination, carries out different coding to target area and other zones of needing to be treated differently;
Decoding unit is decoded with output image to every two field picture.
Video coding-decoding method of the present invention is treated moving target and target context with a certain discrimination according to the characterising parameter of the moving target that intelligent monitored control module obtains, and distinguish coding, can reduce the data volume in the code stream, thereby under low code check situation, also can guarantee the requirement of user video quality.
[description of drawings]
Fig. 1 is the block diagram of intelligent monitor system of the present invention.
Fig. 2 is the flow chart of encoding and decoding in the one embodiment of the invention.
Fig. 3 is for determining to treat with a certain discrimination the flow chart of target area in the one embodiment of the invention.
Fig. 4 is the schematic diagram of the moving target that need treat with a certain discrimination in picture of the present invention.
Schematic diagram when Fig. 5 A is the cell block that intersects with the moving target boundary rectangle that obtains according to the mask of moving target that the cell block that intersects with the moving target mask obtains less than the boundary rectangle according to moving target in the one embodiment of the invention.
Schematic diagram when Fig. 5 B is the cell block that intersects with the moving target boundary rectangle that obtains according to the mask of moving target that the cell block that intersects with the moving target mask obtains greater than the boundary rectangle according to moving target in the one embodiment of the invention.
The three kind methods of Fig. 6 in the one embodiment of the invention target being encoded.
Fig. 7 is the flow chart of decode procedure in the one embodiment of the invention.
[embodiment]
Detailed description of the present invention is mainly come the running of direct or indirect simulation technical solution of the present invention by program, step, logical block, process or other symbolistic descriptions.Be the thorough the present invention that understands, in ensuing description, stated a lot of specific detail.And when not having these specific detail, the present invention then may still can realize.Affiliated those of skill in the art use these descriptions herein and state that the others skilled in the art in affiliated field effectively introduce their work essence.In other words, be the purpose of the present invention of avoiding confusion, because the understanding easily of method of knowing and program, so they are not described in detail.
Alleged herein " embodiment " or " embodiment " are meant special characteristic, structure or the characteristic that can be contained at least one implementation of the present invention.Different in this manual local " in one embodiment " that occur not are all to refer to same embodiment, neither be independent or optionally mutually exclusive with other embodiment embodiment.In addition, represent the sequence of unit in method, flow chart or the functional block diagram of one or more embodiment and revocablely refer to any particular order, also be not construed as limiting the invention.
See also shown in Figure 1ly, it shows the block diagram of intelligent monitor system of the present invention.As shown in the figure, intelligent monitor system of the present invention comprises intelligent monitored control module, treats target area identifying unit, coding unit and decoding unit with a certain discrimination.
Described intelligent monitored control module can be arranged in the intelligent monitoring pick-up head, it can obtain the information of moving object detection and tracking, the sign of target number (ID) for example, various characterising parameters, for example boundary rectangle of moving target, mask, movement velocity, relevant warning message etc.
Because in supervisory control system, possible user is the zone that the moving target motion is arranged to the special zone of being concerned about of video quality, to the changeless background area of picture then is not special care, therefore treat with a certain discrimination the background area that need not too be concerned about the moving target moving region and the user of user's care, intelligent monitor system of the present invention treat the target area identifying unit with a certain discrimination, its moving target characterising parameter that obtains according to intelligent monitored control module is determined the motion target area and the background area that need to be treated differently.
Encode through coding unit through motion target area after judging and background area and since motion target area and background area be subjected to degree of concern different, when coding, also be to carry out different coding discriminatingly therefore.For example can distribute higher bit rate, treat motion target area and background area like this with a certain discrimination the special motion target area of being concerned about of user.The back will be told about in detail.
Through with being divided into the motion target area and the background area of special concern in the frame picture, carrying out different codings respectively like this, is reducible output picture after decoding through decoding unit through the data behind the coding again.
To the concrete steps of the method for encoding and decoding in the whole intelligent monitor system of the present invention be elaborated below;
See also shown in Figure 2ly, it shows the workflow diagram of intelligent monitor system according to an embodiment of the invention, and it comprises the steps: as shown in the figure
Step 21: intelligent monitored control module obtains the information of moving object detection and tracking, the information of wherein obtaining comprises the sign number (ID) of moving target and the various characterising parameters of moving target, wherein said characterising parameter comprises the boundary rectangle of moving target, the grade of the mask of moving target, the movement velocity of moving target and type of alarm, attention rate of moving target image-region of living in or the like.
Step 22: the various parameters of the moving target that obtains according to functional monitoring module are determined the zone that needs to be treated differently.Because possible user is the zone that the moving target motion is arranged to the special zone of being concerned about of video quality, to the changeless background area of picture then is not special care, and therefore treat with a certain discrimination the background area that need not too be concerned about the moving target moving region and the user of user's care.Wherein step 22 further comprises two kinds of situations, and a kind of is that the object of motion and static background are treated with a certain discrimination.Another situation is a moving target process zones of different, triggers different the warning and treats with a certain discrimination when being provided with:
At the step 221 that the object and the static background of motion are treated with a certain discrimination, as shown in Figure 3, it further comprises:
Step 2211: the boundary rectangle according to moving target obtains the cell block that intersects with described moving target.Because present video coding technique normally is divided into many with a frame picture, be based on all for the video coding technique of the picture of whole frame that block encoding realizes.As shown in Figure 4, frame 41 among the figure is the boundary rectangle of moving target, and every frame picture is to be divided into some cell blocks, by seeing among the figure, the boundary rectangle of moving target can intersect with a plurality of cell blocks, and just the frame of each moving target can occupy the picture of a plurality of cell blocks in the background.For example a moving target among the figure has just occupied a plurality of cell blocks such as cell block 42,43 in the frame.
Step 2212: the mask according to moving target obtains the cell block that intersects with the moving target mask.As shown in Figure 4; the image 44 of moving target is the mask of moving target among the figure; cell block in its background that covers in the drawings promptly obtains the cell block that intersects with the moving target mask according to the mask of moving target; obtaining the cell block that intersects with the moving target mask according to the mask of moving target in this step 2212 is the corresponding cell block of moving target, therefore needs to be treated differently.
Step 2213: the cell block that obtains in the cell block that obtains in the step 2211 and the step 2212 is compared; if obtain the cell block that intersects with the moving target mask less than obtain half of the cell block that intersects with described moving target in the step 2211 according to the boundary rectangle of moving target according to the mask of moving target in the step 2212, then encoded in the position that obtains the cell block that intersects with the moving target mask according to the mask of moving target in the step 2212.With one of them moving target among Fig. 4 is example, and in Fig. 5 A, whole square frame then is the cell block that intersects with boundary rectangle moving target that obtain according to step 2211.The cell block that with moving target mask intersect of white portion in the middle of among the figure for obtaining according to step 2212.The cell block number of the white portion in figure is then encoded to the cell block of the white portion among the figure less than a half of the cell block number of whole square frame.
If obtain the cell block that intersects with the moving target mask greater than obtain half of the cell block that intersects with described moving target in the step 2211 according to the boundary rectangle of moving target according to the mask of moving target in the step 2212; then do not belong in the step 2212 cell block that mask according to moving target obtains the cell block that intersects with the moving target mask and encode, and be denoted as background obtaining the cell block that intersects with described moving target according to the boundary rectangle of moving target in the step 2211.Shown in Fig. 5 B, whole square frame then is the cell block that intersects with boundary rectangle moving target that obtain according to step 2211.The cell block that with moving target mask intersect of white portion in the middle of among the figure for obtaining according to step 2212.The cell block number of the white portion in figure is then encoded to the cell block of the black region among the figure greater than a half of the cell block of whole square frame, and these black unit pieces are denoted as background.Bian Ma quantity is that less cell block is encoded all the time like this, and the bit number that the required information of region description takies can be less.
At aforesaid another kind of situation, through zones of different, trigger the different steps 222 of reporting to the police and treating with a certain discrimination when being provided with at moving target, it further comprises:
According to the grade of the type of alarm in the goal description parameter or the attention rate of image-region of living in, when moving target process zones of different, can trigger different the warning and be provided with and motion target area is treated with a certain discrimination.If for example the alarm level of moving target reaches predetermined alarm level simultaneously, then need when encoding, treat with a certain discrimination the image-region at current moving target place, when perhaps if moving target is through bank or golden shop near zone, the ratio that these regional attention rates are provided with is higher, and need treat with a certain discrimination the coding in these zones.
Wherein abovementioned steps 221 and step 222 can all need to carry out, and perhaps only carry out wherein a kind of step and get final product.
Step 23: after the image-region of having determined to need to be treated differently, need encode, when image is encoded, because need take different codings to different zones to image.Can be divided into three kinds of coded systems this moment again.See also shown in Figure 6ly, these three kinds of coded systems are specially:
Method 1:, thereby can use meticulousr quantizing process to obtain the higher-quality image of relative background for the higher bit rate of cell block distribution ratio background cell piece of the moving target mask correspondence of obtaining in the abovementioned steps 2212.Will not encode by the motion target area characterising parameter this moment.Decoding end decoding back obtains the picture rich in detail of respective regions naturally.
Method 2: every frame was only encoded to the zone that needs to be treated differently that obtains according to step 22, and is not encoded in other zones in when coding, and after at interval certain frame, ability was encoded to background when perhaps background had certain variations.Because need to confirm the zone for the treatment of with a certain discrimination, therefore this moment every two field picture code stream in the lossless coding of motion target area characterising parameter is all arranged.
Method 3: the cell block for the moving target mask correspondence of obtaining in the abovementioned steps 2212 strengthens coding, for example gives higher resolution to these cell blocks.This moment every two field picture code stream in the lossless coding of motion target area characterising parameter also as a part that strengthens coding.
Abovementioned steps method 1, method 2, method 3 are to treating three kinds of different coding modes in zone with a certain discrimination, can use wherein a kind of coded system arbitrarily in real process.
Step 24: the image after the coding is decoded with output image.
In wherein aforementioned three kinds of coded systems, method 1 and method 3 described methods do not need special decoding device.And for method 2 described coded systems, as shown in Figure 7, when decoding, comprise the steps:
Step 241: the motion target area characterising parameter of decoding present image, boundary rectangle according to each target area that obtains after the decoding, and in the abovementioned steps 2213 to the decoding of the position of each cell block that needs to be treated differently of moving target mask correspondence, the position of each cell block that obtains treating with a certain discrimination.
Step 242: because during aforementioned coding, be that at interval certain frame or background are just encoded to background when changing, therefore, if present frame is a background frames, then to this frame background image updating afterwards of decoding.Otherwise continuation next step:
Step 243: the image of each cell block that decoding is treated with a certain discrimination is to the corresponding unit block position.
Step 244: decoded target area for the treatment of with a certain discrimination and background image are merged, and form a complete image.
Video coding-decoding method of the present invention is treated moving target and target context with a certain discrimination according to the characterising parameter of the moving target that intelligent monitored control module obtains, and distinguish coding, can reduce the data volume in the code stream, thereby under low code check situation, also can guarantee the requirement of user video quality.
Above-mentioned explanation has fully disclosed the specific embodiment of the present invention.It is pointed out that and be familiar with the scope that any change that the person skilled in art does the specific embodiment of the present invention does not all break away from claims of the present invention.Correspondingly, the scope of claim of the present invention also is not limited only to previous embodiment.
Claims (14)
1. the method for image coding and decoding in the intelligent monitor system, it comprises:
Obtain the characterising parameter of moving target in every frame;
Determine the target area that needs to be treated differently according to the characterising parameter of described moving target;
Different coding is carried out so that described target area and other zone are treated with a certain discrimination in the described target area that needs to be treated differently and other area region;
Every two field picture is decoded with output image.
2. the method for claim 1, the characterising parameter that wherein obtains moving target in every frame comprises the boundary rectangle of moving target and the mask of moving target, described characterising parameter according to moving target determines that the target area that needs to be treated differently comprises:
Boundary rectangle according to described moving target obtains the cell block that intersects with described moving target;
Mask according to described moving target obtains the cell block that intersects with described moving target;
If the cell block that intersects with described moving target that obtains according to the mask of described moving target obtains the cell block that intersects with described moving target half less than the boundary rectangle according to described moving target, encode in the position of the cell block that intersects with described moving target that then will obtain according to the mask of described moving target, described mask according to described moving target obtains the cell block that intersects with described moving target and is the target area that needs to be treated differently; Do not belong to the cell block that mask according to described moving target obtains the cell block that intersects with described moving target and encode otherwise will obtain the cell block that intersects with described moving target, and be denoted as background according to the boundary rectangle of described moving target.
3. the method for claim 1, the characterising parameter that wherein obtains moving target in every frame comprises the type of alarm grade of moving target or the attention rate of image-region of living in, and described characterising parameter according to moving target determines that the target area that needs to be treated differently comprises: trigger different the warning at moving target through zones of different and determine when being provided with that described moving target is the target area that needs to be treated differently.
4. method as claimed in claim 2 is wherein carried out different coding to the described target area that needs to be treated differently and is comprised so that described target area is treated with a certain discrimination with other zone: for the corresponding higher bit rate of other cell blocks of cell block distribution ratio of the target mask that needs to be treated differently.
5. method as claimed in claim 2, wherein different coding being carried out in the described target area that needs to be treated differently comprises so that described target area and other zone are treated with a certain discrimination: carry out lossless coding and encode for the target area that needs to be treated differently for described motion target area characterising parameter, at interval predetermined frame or just background is encoded when background changes.
6. method as claimed in claim 2 is wherein carried out different coding to the described target area that needs to be treated differently and is comprised so that described target area is treated with a certain discrimination with other zone: carries out lossless coding and strengthen coding for the corresponding cell block of the target mask that needs to be treated differently and the lossless coding of described motion target area characterising parameter for described motion target area characterising parameter.
7. method as claimed in claim 5, wherein every two field picture being decoded comprises with output image:
If present frame be a background frames decode the back background image updating;
The motion target area characterising parameter of decoding present image, the position of the boundary rectangle of each target area that obtains according to decoding back and each cell block that the decoding of the moving target mask corresponding unit piece that needs to be treated differently is obtained needing to be treated differently;
Decode the image of each cell block to units corresponding piece position;
Decoded target area and background image are merged.
8. intelligent monitor system, it comprises:
The moving object detection unit, it detects the characterising parameter of moving target;
Treat the target area identifying unit with a certain discrimination, it judges according to the moving target characterising parameter that described moving object detection unit obtains whether moving target is the target that needs to be treated differently;
Coding unit according to treating the result that the target area identifying unit is judged with a certain discrimination, carries out different coding to target area and other zones of needing to be treated differently;
Decoding unit is decoded with output image to every two field picture.
9. intelligent monitor system as claimed in claim 8, the characterising parameter of moving target comprises the boundary rectangle of moving target and the mask of moving target in every frame that wherein said moving object detection unit obtains, and the described target area identifying unit for the treatment of with a certain discrimination determines that according to the characterising parameter of moving target the target area that needs to be treated differently comprises:
Boundary rectangle according to described moving target obtains the cell block that intersects with described moving target;
Mask according to described moving target obtains the cell block that intersects with described moving target;
If the cell block that intersects with described moving target that obtains according to the mask of described moving target obtains the cell block that intersects with described moving target half less than the boundary rectangle according to described moving target, encode in the position of the cell block that intersects with described moving target that then will obtain according to the mask of described moving target, described mask according to described moving target obtains the cell block that intersects with described moving target and is the target area that needs to be treated differently; Do not belong to the cell block that mask according to described moving target obtains the cell block that intersects with described moving target and encode otherwise will obtain the cell block that intersects with described moving target, and be denoted as background according to the boundary rectangle of described moving target.
10. intelligent monitor system as claimed in claim 8, the characterising parameter of moving target comprises the type of alarm grade of moving target or the attention rate of image-region of living in every frame that wherein said moving object detection unit obtains, and the described target area identifying unit for the treatment of with a certain discrimination determines that through different warning of zones of different triggering described moving target is the target area that needs to be treated differently at moving target according to the characterising parameter of moving target when being provided with.
11. intelligent monitor system as claimed in claim 9, wherein said coding unit is to the higher bit rate of other cell blocks of cell block distribution ratio of the target mask correspondence that needs to be treated differently.
12. intelligent monitor system as claimed in claim 9, wherein said coding unit carries out lossless coding for described motion target area characterising parameter and encodes for the target area that needs to be treated differently, at interval predetermined frame or just background is encoded when background changes.
13. intelligent monitor system as claimed in claim 9, wherein said coding unit carries out lossless coding and strengthens coding for the cell block of the target mask correspondence that needs to be treated differently and the lossless coding of described motion target area characterising parameter for described motion target area characterising parameter.
14. intelligent monitor system as claimed in claim 12, wherein decoding unit is decoded to every two field picture and is comprised with output image:
If present frame be a background frames decode the back background image updating;
The motion target area characterising parameter of decoding present image, the position of the boundary rectangle of each target area that obtains according to decoding back and each cell block that the decoding of the moving target mask corresponding unit piece that needs to be treated differently is obtained needing to be treated differently;
Decode the image of each cell block to units corresponding piece position;
Decoded target area and background image are merged.
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| CN105898303A (en) * | 2015-12-24 | 2016-08-24 | 乐视云计算有限公司 | Bit rate control method and device |
| CN106658027A (en) * | 2016-11-28 | 2017-05-10 | 北京理工大学 | Background frame code rate control method and device |
| CN106658027B (en) * | 2016-11-28 | 2019-05-24 | 北京理工大学 | The bit rate control method and device of background frames |
| CN110738224A (en) * | 2018-07-19 | 2020-01-31 | 杭州海康慧影科技有限公司 | image processing method and device |
| CN110708507A (en) * | 2019-09-23 | 2020-01-17 | 深圳市景阳信息技术有限公司 | Monitoring video data transmission method and device and terminal equipment |
| CN113393487A (en) * | 2021-05-26 | 2021-09-14 | 深圳市宏电技术股份有限公司 | Moving object detection method, moving object detection device, electronic equipment and medium |
| CN113393487B (en) * | 2021-05-26 | 2023-12-29 | 深圳市宏电技术股份有限公司 | Moving object detection method, moving object detection device, electronic equipment and medium |
| CN113329227A (en) * | 2021-05-27 | 2021-08-31 | 中国电信股份有限公司 | Video coding method and device, electronic equipment and computer readable medium |
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