CN101854547A - Motion frame in video collection and transmission system, method and system for detecting prospects - Google Patents
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Abstract
The invention provides a motion frame in a video collection and transmission system, a method and a system for detecting prospects. The system comprises a video compression unit and a prospect detection unit which comprises an information extraction unit and a motion detection unit, wherein the information extraction unit acquires a coding mode, a motion vector and a direct current component coefficient in a compression code flow, and sets the output result matrix of the current frame; the motion detection unit judges the motion of the block base of the current frame according to the coding mode, the motion vector and the direct current component acquired by the information extraction unit and inputs the result matrix; and the result matrix is utilized to judge the motion of the current frame to realize prospect detection.
Description
[technical field]
The present invention relates to the electronic monitoring field, particularly about the method and the device of motion frame and foreground detection in a kind of video acquisition transmission system.
[background technology]
In the video acquisition transmission system of prior art, because the amount of image information of video acquisition is very big, for reducing the image transmission amount of information of video acquisition, existing video acquisition transmission system, for example in the supervisory control system, the normally coding video data compression of at first image collecting device of front end in the supervisory control system being gathered, wherein utilize inter-frame prediction method in the piece base frame to remove redundancy on the video data space time in the cataloged procedure, like this can be little more a lot of than the data data volume of not passing through encoding compression through the view data after the encoding compression, can save the amount of information of transfer of data like this, raise the efficiency.
When coding video data is compressed, video data can be divided into the coding mode of frame in inter-frame or the frame usually, obtain the residual sum motion vector and realize and utilize near current block position facing in the reference frame mutually to carry out motion estimation search in the interframe encode.So can comprise various information such as coding mode, motion vector among the code stream result to output after the coding video data compression.
Whether there is the foreground detection method of moving object can adopt the method for frame difference or background subtraction usually in the existing detection one frame picture; but the data volume that these methods need is very big, causes existing monitoring frontend owing to be subjected to the constraint of calculation of equipments ability and memory space to be difficult in front end and realizes detection of motion and warning function.
Therefore, be necessary to provide a kind of demand data amount littler foreground detection method, to overcome the defective described in the background technology.
[summary of the invention]
The object of the present invention is to provide the method for foreground detection in a kind of video acquisition transmission system, it can make full use of the compressed bit stream information of encoder, only needs view data still less, and computing is simple.
Another object of the present invention is to provide the device of foreground detection in a kind of video acquisition transmission system, it can make full use of the compressed bit stream information of encoder, only needs view data still less, and computing is simple.
A further object of the present invention is to provide the detection method of motion frame in a kind of video acquisition transmission system.
Another purpose of the present invention is to provide the device that motion frame detects in a kind of video acquisition transmission system.
For reaching aforementioned purpose, the method for foreground detection in a kind of video acquisition transmission system of the present invention, it comprises: the video data of gathering is carried out the video coding compression;
Obtain the information in the video data compression code stream after the encoding compression;
Coding mode according to the present frame in the aforementioned information of obtaining is set, if present frame is an interframe encoding mode, then set the output matrix of consequence of present frame, wherein each of matrix put each piece of corresponding present frame, further judge whether each piece in the present frame moves, be when motion when described, change the numerical value to point that should piece in the described matrix of consequence into non-zero values, otherwise be zero; With
Export described matrix of consequence, the image of the piece correspondence of the non-zero values correspondence in the described matrix of consequence is prospect.
Further, the described information of obtaining comprises the motion vector of piece, describedly further judge whether in the present frame each piece moves and comprise: motion vector and described position at current matrix according to certain piece that obtains obtain described in the position of former frame corresponding reference piece in the previous frame matrix, check whether reference block moves, if reference block is motion, then current block is motion.
Further, the described information of obtaining comprises the motion vector and the DC component of piece, describedly further judges whether in the present frame each piece moves and comprises: the move distance of asking for piece according to the motion vector of the piece that obtains; Move distance is carried out threshold segmentation, surpass the moving mass that is judged as of threshold values; For move distance less than the further value of judging DC component of threshold values whether greater than pre-set threshold value, if greater than then described be moving mass.
Further, the described information of obtaining comprises the coding mode of frame of video and piece, describedly further judge whether in the present frame each piece moves and comprise: the coding mode according to each piece that obtains judges whether each piece moves, if then described of piece is a moving mass in the frame.
According to one embodiment of the invention, it further is included in each piece of judgement for after the motion described matrix of consequence being carried out smothing filtering described method.
For reaching aforementioned another purpose, foreground detection device in a kind of video acquisition transmission system of the present invention, wherein said video acquisition transmission system comprises the video acquisition unit of gathering video, the video data of video acquisition unit collection is carried out the video coding compression unit of video coding compression, described foreground detection device comprises the foreground detection unit that the video data after the compression is carried out foreground detection, described foreground detection unit comprises information extraction unit and motion detection unit, and the information extraction unit of described foreground detection unit is obtained the information in the video data compression code stream after the encoding compression; The coding mode of the present frame that the motion detection unit of foreground detection unit is obtained according to information extraction unit, if interframe encoding mode, then set the output matrix of consequence of present frame, wherein each of matrix put each piece of corresponding present frame, further judge whether each piece in the present frame moves, when piece is motion, change the numerical value to point that should piece in the described matrix of consequence into non-zero values, otherwise be zero, data are that the image of the piece correspondence of non-zero values correspondence is prospect in the described matrix of consequence.
For reaching the aforementioned purpose again of the present invention, motion frame checkout gear in a kind of video acquisition transmission system of the present invention, wherein said video acquisition transmission system comprises the video acquisition unit of gathering video, the video data of video acquisition unit collection is carried out the video coding compression unit of video coding compression, described motion frame checkout gear comprises the foreground detection unit that the video data after the compression is carried out foreground detection, described foreground detection unit comprises information extraction unit and motion detection unit, and the information extraction unit of described foreground detection unit is obtained the information in the video data compression code stream after the encoding compression; The video data encoding information that the motion detection unit of foreground detection unit is obtained according to information extraction unit judges whether present frame moves; Wherein the coding mode of the present frame that obtains according to information extraction unit of motion detection unit judges whether present frame moves, if present frame is that intra-frame encoding mode judges that then present frame is motion, if present frame is an interframe encoding mode, whether each piece of then further judging present frame moves, if there be any to be motion, then described frame is motion; Motion detection unit judges whether continuous some frames all are motion, if continuous some frames all move and judge that then present frame is a motion frame.
For reaching another object of the present invention, the detection method of motion frame in a kind of video acquisition transmission system of the present invention, it comprises:
The video data of gathering is carried out the video coding compression;
Obtain the information in the video data compression code stream after the encoding compression;
Coding mode according to the present frame in the aforementioned information of obtaining judges whether present frame moves, if present frame is an intra-frame encoding mode, judge that then present frame is motion, if present frame is an interframe encoding mode, judge further then whether each piece in the present frame moves, if have any for motion, judge that then present frame is motion;
Judge whether continuous some frames all are motion, if continuous some frames are motion and judge that then present frame is a motion frame.
Foreground detection method of the present invention and device have made full use of the information such as piece based encode pattern, piece base motion vector and DC component of the compressed bit stream of encoder, judge by these information whether a frame moves, can judge according to the packed data of a frame and whether move, than the needs view data still less of frame difference and background subtraction, computing is simple.
[description of drawings]
Fig. 1 is the structured flowchart of video acquisition transmission system according to an embodiment of the invention.
Fig. 2 is the flow chart of foreground detection method according to an embodiment of the invention.
Fig. 3 is the workflow block diagram of motion detection unit according to an 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 structured flowchart of video acquisition transmission system according to an embodiment of the invention.As shown in Figure 1, video acquisition transmission system of the present invention comprise the video acquisition unit of gathering video image, to the video image of video acquisition unit collection carry out encoding compression video compression unit, foreground detection unit, detect information transmission unit and Video Transmission Unit.
Wherein video acquisition unit can be the front end image collecting device of a supervisory control system, and for example monitoring camera also can be external camera of desktop computer or the first-class device with video acquisition function of the shooting in the notebook computer.
The video compression unit can be a video encoder, and the coding video data that video acquisition unit is gathered compresses.An encoder, it generally includes: utilizes the discrete cosine transformer that redundancy is come compression data on the space, utilizes temporal redundancy to come the dynamic estimator and the dynamic compensator of compression data, and variable length coder etc.Through the video compression data after the video encoder encodes, the coding mode that it can comprise usually to each frame picture for example is intraframe coding, or interframe encode, and motion vector, DC component coefficient or the like the relevant parameter of different masses base in each frame.About the principle of video encoder and structure the present invention detailed explanation no longer.
According to one embodiment of the invention, described foreground detection unit comprises information extraction unit, motion detection unit and alarm decision unit.
Described information extraction unit is responsible for resolving the information through in the code stream of encoding compression, obtain the relevant information in the compressed bit stream, the compressed encoding pattern that mainly comprises the piece base of each frame of video data and each frame, it for example is frame in the frame, or inter-frame, the motion vector of the piece base in each frame and the DC component coefficient of each piece base.
Motion detection unit judges according to the information of each frame that information extraction unit is obtained whether each frame picture is motion, if for the motion represent that there are objects moving in the picture, promptly so-called prospect.
When motion detection unit sends information judged to an alarm decision unit, can judge whether to report to the police according to alarm region of setting and detected moving region by the alarm decision unit.Just report to the police when there are objects moving in secret places such as monitoring shop that for example has or bank.
Motion detection unit can and need the information of warning to send to monitor terminal by detecting information transmission unit together with detected movable information.Certainly, in other embodiments, also the alarm decision unit can be set, and the information that only will detect is transferred to monitor terminal by detecting information transmission unit.
As shown in Figure 1, in one embodiment, the workflow of video acquisition transmission system of the present invention is, video acquisition unit is gathered after the video data, the video compression unit carries out encoding compression to the video image of video acquisition unit collection, can directly be transferred to the terminal that need watch described video image by Video Transmission Unit through the video image of encoding compression.
And in another embodiment, can directly transmit through the video of encoding compression by Video Transmission Unit except aforementioned, if desired the video data of being gathered is directly carried out foreground detection, judge whether object of which movement is arranged in the monitored picture, then the video data through overcompression can be passed through the foreground detection unit, carry out foreground detection, and terminal is sent detection information by detecting information transmission unit.
See also shown in Figure 2ly, it shows the workflow diagram of video acquisition transmission system of the present invention.As shown in Figure 2, video acquisition transmission system of the present invention, it comprises the steps:
Step 21: video acquisition unit is gathered video.
Step 22: the coding video data compression that the video compression unit is gathered video acquisition unit, video data through encoding compression, the motion vector that wherein comprises each piece base in the coding mode, each frame of each piece base in each frame picture and each frame, the DC component coefficient of each piece base.
Step 23: the information extraction unit of foreground detection unit is resolved the relevant information in the compressed bit stream of exporting the video compression unit, the motion vector that mainly comprises each piece base in the coding mode that obtains each piece base in each frame picture and each frame, each frame, the DC component coefficient of each piece base.
Step 24: the motion detection unit of foreground detection unit detects judges whether present frame is motion frame.
See also shown in Figure 3ly, wherein step 24 further comprises again:
Step 241: the coding mode of each frame picture that motion detection unit is obtained according to information extraction unit, judge whether present frame moves, if present frame is a frame in the frame, judge that then present frame is a motion frame.Judge that present frame is in the frame after the frame, then change step 246 pair present frame over to and carry out time smoothing filtering, judge promptly whether continuous N (N 〉=2 usually) frame all be motion, if continuous N frame all is to move, judges that then motion has taken place the object in these frames really.If present frame is inter-frame then carries out next step judgement.
For inter-frame, the image size according to present frame is divided into some with present frame, and according to different coded systems, the size of piece may be different, and piece is the macro block of 16*16 usually.The matrix of setting N*N is as output matrix of consequence, wherein each piece in the numerical value correspondence image of the point of each in the matrix.The initial value of each point in the matrix of consequence all is 0, when one of them piece for motion time then in the matrix of consequence numerical marker to point that should piece be 1, represent that this piece is a moving mass.
Step 242: the coding mode of each piece of the present frame that obtains according to information extraction unit judges whether present frame is motion frame.The coding mode of each piece of the present frame that motion detection unit is obtained according to information extraction unit is judged, if a certain of present frame is the interior piece of frame of intra-frame encoding mode, judge that then current this piece is a moving mass, correspondingly will represent in the matrix of this frame point that should piece is denoted as 1.Can carry out smothing filtering to matrix of consequence then.If a certain is the interframe block of interframe encode then can further further judges by following step 243 or 244.
Step 243: the reference block according to the interframe block of present frame judges whether present frame is motion frame.Motion detection unit is obtained the position of current block base at the piece base (can be called reference block) of former frame correspondence according to the current location and the motion vector of the interframe block in the present frame, check that then the position of reference block in the matrix of consequence of previous frame is 1 or 0, if 1 expression reference block is a moving mass, judge also that then piece corresponding with described reference block in the present frame is a moving mass in previous frame.Then matrix of consequence is carried out smothing filtering.
Step 244: the motion vector according to the interframe block of present frame judges whether present frame is motion frame.Motion detection unit according to the motion vector of the interframe block in the present frame ask for current block move distance MV=(| MV
X|+| MV
Y|), preestablish the threshold values of move distance, if the move distance of the current block base of being obtained surpasses the threshold values of described move distance, judge that then the current block base is a moving mass.If the move distance of being obtained is less than predefined move distance threshold values, can further set the threshold values of a piece base DC component, if the DC component of current block judges then that greater than the DC component threshold values of setting current block is a moving mass, carries out smothing filtering to matrix of consequence then.
In abovementioned steps 242, judge when current block is interframe block, follow-up selection step 243 or 244 steps all can or execution in step 243,244 is also passable simultaneously.
Step 245: the result that abovementioned steps 242,243,244 is judged is input in the matrix of consequence of present frame, if comprise 1 in the matrix of consequence, represents that then present frame is a motion frame.
Step 246: video data is carried out time smoothing filtering, judge promptly whether continuous N (N 〉=2 usually) frame all is motion,, judge that then these frames are motion frame really if continuous N frame all is motion.
Step 25: whether the present frame that the alarm decision unit is judged according to motion detection unit moves, and judges whether to report to the police according to the alarm region of setting, and reports to the police if desired, then produces alarm signal.
Step 26: detection information and warning message that the foreground detection unit is produced send follow-up unit to by detecting information transmission unit.
More than be to judge whether a frame picture is the step of motion frame, wherein, judge in the step whether a frame picture move, for inter-frame, be set with the output matrix of consequence, wherein each piece in the numerical value correspondence image of the point of each in the matrix aforementioned.The initial value of each point in the matrix of consequence all is 0, when one of them piece for motion time then in the matrix of consequence numerical marker to point that should piece be 1, represent that this piece is a moving mass.When doing foreground detection, can be according to the Data Detection of described matrix, numerical value is that the image of 1 some correspondence is prospect in the matrix.
In the aforementioned embodiment, numerical value 1 expression in the output matrix of consequence is motion, and the non-motion of 0 expression certainly in other embodiments, also can be represented motion with other non-zero values, and the non-motion of 0 expression.
Foreground detection of the present invention unit can be applied to be used for the headend equipment of video acquisition and compression, also can be used for the backstage video code flow that receives is analyzed.
Foreground detection method of the present invention and device have made full use of the information such as piece based encode pattern, piece base motion vector and DC component of the compressed bit stream of encoder, judge by these information whether a frame moves, can judge according to the packed data of a frame and whether move, needs view data still less than frame difference and background subtraction, computing is simple, therefore can be applied in the headend equipment of video acquisition and compression.
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 (12)
1. the method for foreground detection in the video acquisition transmission system, it comprises:
The video data of gathering is carried out the video coding compression;
Obtain the information in the video data compression code stream after the encoding compression;
Coding mode according to the present frame in the aforementioned information of obtaining is set, if present frame is an interframe encoding mode, then set the output matrix of consequence of present frame, wherein each of matrix put each piece of corresponding present frame, further judge whether each piece in the present frame moves, be when motion when described, change the numerical value to point that should piece in the described matrix of consequence into non-zero values, otherwise be zero; With
Export described matrix of consequence, the image of the piece correspondence of the non-zero values correspondence in the described matrix of consequence is prospect.
2. the method for claim 1, it is characterized in that: the described information of obtaining comprises the motion vector of piece, describedly further judge whether in the present frame each piece moves and comprise: motion vector and described position at current matrix according to certain piece that obtains obtain described in the position of former frame corresponding reference piece in the previous frame matrix, check whether reference block moves, if reference block is motion, then current block is motion.
3. the method for claim 1, it is characterized in that: the described information of obtaining comprises the motion vector and the DC component of piece, describedly further judges whether in the present frame each piece moves and comprises: the move distance of asking for piece according to the motion vector of the piece that obtains; Move distance is carried out threshold segmentation, surpass the moving mass that is judged as of threshold values; For move distance less than the further value of judging DC component of threshold values whether greater than pre-set threshold value, if greater than then described be moving mass.
4. as the described method of claim 1 to 3, it is characterized in that: the described information of obtaining comprises the coding mode of frame of video and piece, describedly further judge whether in the present frame each piece moves and comprise: the coding mode according to each piece that obtains judges whether each piece moves, if then described of piece is a moving mass in the frame.
5. the method for claim 1, it further is included in judges that each piece is for carrying out smothing filtering to described matrix of consequence after the motion.
6. the foreground detection device in the video acquisition transmission system, wherein said video acquisition transmission system comprises the video acquisition unit of gathering video, the video data of video acquisition unit collection is carried out the video coding compression unit of video coding compression, it is characterized in that: described foreground detection device comprises the foreground detection unit that the video data after the compression is carried out foreground detection, described foreground detection unit comprises information extraction unit and motion detection unit, and the information extraction unit of described foreground detection unit is obtained the information in the video data compression code stream after the encoding compression; The coding mode of the present frame that the motion detection unit of foreground detection unit is obtained according to information extraction unit, if interframe encoding mode, then set the output matrix of consequence of present frame, wherein each of matrix put each piece of corresponding present frame, further judge whether each piece in the present frame moves, when piece is motion, change the numerical value to point that should piece in the described matrix of consequence into non-zero values, otherwise be zero, data are that the image of the piece correspondence of non-zero values correspondence is prospect in the described matrix of consequence.
7. foreground detection device as claimed in claim 6, it is characterized in that: the information that described foreground detection unit obtains comprises described motion vector, described motion detection unit is obtained described in the position of former frame corresponding reference piece in the previous frame matrix according to the position and the motion vector at current matrix of certain piece that information extraction unit is obtained, check whether reference block moves, if reference block is motion, then current block is motion.
8. foreground detection device as claimed in claim 6, it is characterized in that: the information that described foreground detection unit obtains comprises the motion vector and the DC component of piece, and the motion vector of the piece that described motion detection unit is obtained according to information extraction unit is asked for the move distance of piece; Move distance is carried out threshold segmentation, surpass the moving mass that is judged as of threshold values; For move distance less than the further value of judging DC component of threshold values whether greater than pre-set threshold value, if greater than then described be moving mass.
9. as the described foreground detection device of claim 6 to 8, it is characterized in that: the information that described foreground detection unit obtains comprises the coding mode of frame of video and piece, described motion detection unit judges according to the coding mode of each piece that information extraction unit is obtained whether each piece moves, and is that then described of intra-frame encoding mode is moving mass as if described.
10. foreground detection device as claimed in claim 6 is characterized in that: further comprise the alarm decision unit in the foreground detection unit, in order to judge whether to report to the police according to alarm region of setting and the detected moving region of motion detection unit.
11. the motion frame checkout gear in the video acquisition transmission system, wherein said video acquisition transmission system comprises the video acquisition unit of gathering video, the video data of video acquisition unit collection is carried out the video coding compression unit of video coding compression, it is characterized in that: described motion frame checkout gear comprises the foreground detection unit that the video data after the compression is carried out foreground detection, described foreground detection unit comprises information extraction unit and motion detection unit, and the information extraction unit of described foreground detection unit is obtained the information in the video data compression code stream after the encoding compression; The video data encoding information that the motion detection unit of foreground detection unit is obtained according to information extraction unit judges whether present frame moves; Wherein the coding mode of the present frame that obtains according to information extraction unit of motion detection unit judges whether present frame moves, if present frame is that intra-frame encoding mode judges that then present frame is motion, if present frame is an interframe encoding mode, whether each piece of then further judging present frame moves, if there be any to be motion, then described frame is motion; Motion detection unit judges whether continuous some frames all are motion, if continuous some frames all move and judge that then present frame is a motion frame.
12. the detection method of motion frame in the video acquisition transmission system, it comprises:
The video data of gathering is carried out the video coding compression;
Obtain the information in the video data compression code stream after the encoding compression;
Coding mode according to the present frame in the aforementioned information of obtaining judges whether present frame moves, if present frame is an intra-frame encoding mode, judge that then present frame is motion, if present frame is an interframe encoding mode, judge further then whether each piece in the present frame moves, if have any for motion, judge that then present frame is motion;
Judge whether continuous some frames all are motion, if continuous some frames are motion and judge that then present frame is a motion frame.
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| CN102043949A (en) * | 2010-12-28 | 2011-05-04 | 天津市亚安科技电子有限公司 | Method for searching region of interest (ROI) of moving foreground |
| CN102043949B (en) * | 2010-12-28 | 2015-02-11 | 天津市亚安科技股份有限公司 | Method for searching region of interest (ROI) of moving foreground |
| CN106023346A (en) * | 2016-07-06 | 2016-10-12 | 福州瑞芯微电子股份有限公司 | Dynamic frame rate driving record system and vehicle speed judgment device |
| CN112969078A (en) * | 2021-03-23 | 2021-06-15 | 统信软件技术有限公司 | Bullet screen anti-blocking method in video, computing equipment and readable storage medium |
| CN112969078B (en) * | 2021-03-23 | 2023-02-28 | 统信软件技术有限公司 | Bullet screen anti-blocking method in video, computing equipment and readable storage medium |
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