Motion Detection Method Based on Motion Vector
A motion vector and motion detection technology, which is applied in the field of motion detection based on motion vector, can solve the problems of complex motion detection calculation, and achieve the effect of reducing storage space.
Inactive Publication Date: 2011-11-30
FUJIAN STAR NET EVIDEO INFORMATION SYST CO LTD +1
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The invention determines the motion state of the currently coded block (its block includes one or more than two macroblocks) by calculating auxiliary parameters and encoding parameters, thereby judging the movement of the block; the motion detection of the method The calculation is more complicated
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[0025] Please refer to figure 1 Shown, the motion detection method based on motion vector of the present invention, comprises the following steps:
[0026] Step 10, every fixed number of frames (wherein it is 4 fixed frames in the present embodiment) carries out a moving object detection to P frame in video sequence (wherein general video sequence is the mixed composition of I frame and P frame, its I frame has no motion vector), extract all the macroblock motion vectors of the P frame, where the size of all macroblocks of the P frame is 8×8 pixel blocks; all macroblocks of the P frame divide a frame image into a motion vector macro block table.
[0027] Step 20, setting the first threshold T 1 ,T 1 As a criterion for judging whether a macroblock is a motion macroblock; start searching from the macroblock in the upper left corner of the motion vector macroblock table by row, calculate and judge the motion vector of each macroblock: calculate Whether the value is greater t...
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The invention provides a mobile detecting method based on a motion vector. The method is characterized by: carrying out a motion object detecting on a P frame every fixed frame numbers in a video sequence; extracting all macro-block motion vectors of the P frame, wherein all the macro blocks of the P frame divides a frame image into a motion-vector macro-block table; searching in rows from a macro block which is in a top left corner of the motion-vector macro-block table; calculating the motion vector of each macro block and determining so as to obtain a vertex macro block of a moving object;comparing the vertex macro block with 3x3 macro blocks which regard the vertex macro block as a center, finding the macro block which is closest to the vertex macro block and taking the macro block as a marginal macro block of the moving object; taking the marginal macro block of the moving object as the center to continuously search the next marginal macro block which is similar to the marginal macro block; continuously searching the next marginal macro block as the above steps till finding a setting threshold number of macro blocks. By using the invention, operation is simple; whether the moving object exists can be effectively determined; the threshold can be adjusted so as to adjust sensitivity.
Description
【Technical field】 [0001] The invention relates to the technical field of intelligent video, in particular to a motion detection method based on motion vectors. 【Background technique】 [0002] Moving target detection refers to extracting the target from the monitoring scene by identifying the image changes of the monitoring screen. It is a key step in video surveillance. Moving target detection is at the bottom of the entire video surveillance system and is the basis for various subsequent advanced applications such as target tracking, target classification, and target behavior analysis. Therefore, moving target detection is a key link in video image processing. [0003] There are currently three mainstream moving target detection methods: [0004] 1. The inter-frame difference method is between two or three adjacent frames in a continuous image sequence, using pixel-based difference between image frames and thresholding to extract the moving area in the image. [0005] 2...
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IPC IPC(8): H04N7/26H04N5/14H04N19/55
Inventor 袁嘉晟焦剑
Owner FUJIAN STAR NET EVIDEO INFORMATION SYST CO LTD