Video mode recognition method based on edge detection
A video mode and edge detection technology, applied in the field of interlaced video scanning format conversion, can solve the problems of easy to cause misjudgment, low judgment accuracy, and traditional methods are not delicate enough, and achieve fast switching and good anti-noise interference characteristics. Effect
Inactive Publication Date: 2011-11-23
SICHUAN PANOVASIC TECH
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[0008] Only two adjacent video fields with different polarities are used to calculate the field difference. Such a field difference cannot reflect the characteristics of the duplicate field in the 3:2 pull-down mode, so the judgment accuracy of this mode is not high;
[0009] The algorithm uses a fixed threshold value, which limits the range of use of the algorithm. For videos with large field difference fluctuations, it cannot be changed with the video, which may easily cause misjudgment;
[0010] In static scenes or videos with only a small amount of motion, the processing of traditional methods is not delicate enough;
[0011] If the video image is disturbed by noise, traditional methods cannot correctly detect
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[0043] Such as figure 2 As shown, the system for detecting film mode of the present invention includes a median filter module 1, a threshold generation module 2, an edge processing module 3, a field difference calculation module 4, a field mark sequence generation module 5, and a mode judgment module 6. The system judges the input video The specific steps for whether it is movie mode or not are:
[0044] 1. In the median filtering module 1, the input video image is carried out median filtering, the purpose is to remove the noise in the input video image, and avoid producing non-edge points in the subsequent edge extraction process;
[0045] 2. In the threshold generation module 2, calculate the mean square error of the input video image:
[0046] σ = 1 M × N - 1 Σ i ...
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The invention relates to a method to identify whether an input video is a 3:2 pull-down movie mode or a common interlaced scanning video. The invention discloses a video mode identifying method based on edge detection aiming at deficiency of low accuracy of prior art. It identifies the video mode by using the edge detection technology according to the 3:2 pull-down movie mode characteristic. The invention detects the movie mode based on an idea that edge displacement is generated by movement, which can accurately differentiate whether the video is a 3:2 pull-down movie mode or a common interlaced scanning video. The invention has great noise disturb resisting characteristic, which can switch rapidly from the movie mode to the non movie mode. It is applied to de-interlacing video mode identifying field.
Description
Technical field: [0001] The invention relates to an interlaced video scanning format conversion technology, in particular to a method for identifying whether an input video is a 3:2 pull-down movie mode or an ordinary interlaced scanning video. technical background: [0002] Due to the limitation of transmission bandwidth, the video signal sent by the TV station is not a complete image, but a frame is divided into odd field and even field and transmitted successively. At the user terminal, the TV is also scanned one by one. , to realize the display of the image. This technology is called interlaced scanning technology, although it saves transmission bandwidth, it damages the picture quality. With the continuous development of TV technology and the continuous improvement of the audience's requirements for the picture quality of watching TV programs, progressive scan TVs have become popular, but the TV signals sent by broadcasting stations are still dominated by interlaced sc...
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IPC IPC(8): H04N7/01
Inventor 陈涛刘强
Owner SICHUAN PANOVASIC TECH