Method and device for generating video interpolation frame

Abstract

The invention discloses a method and device for generating a video interpolation frame, relating to video processing. The method comprises the following steps: detecting whether the brightness of the current frame is changed abruptly relative to the previous frame by calculating the difference of the average brightness value of the current frame and the average brightness value of the previous frame image; if so, selecting to copy the current frame or the previous frame as an interpolation output frame, otherwise, searching the motion vector of the interpolation frame corresponding to each subblock through bilateral movement of block matching; and then filtering the motion vector, and generating a movement compensation interpolation frame serving as the interpolation output frame according to the motion vector. According to the invention, large arithmetic amount caused by a great deal of errors during the movement searching of the two adjacent frames with relatively larger brightness difference is avoided, and a false searching result is avoided, therefore, the video with suddenly changed brightness can be effectively processed.

Description

technical field [0001] The invention relates to video processing, in particular to interpolation frame generation technology in video processing. Background technique [0002] When a video is displayed on an existing display device, such as a Liquid Crystal Display ("LCD"), since the working method of these display devices is to keep displaying the previous frame signal until the next frame of video is refreshed, the display The effect depends largely on the high or low frame rate of the video. [0003] Existing experiments have found that the lower the frame rate of the video, the worse the display effect, especially the video with fast moving objects. When watching this kind of video, the human eye will appear "flickering" in the moving area. Eye fatigue is more noticeable on large displays. In addition, due to factors such as low image sensor acquisition frequency, limited hardware processing capability, and insufficient network bandwidth, the frame rate of some existin...

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Problems solved by technology

[0005] However, the inventors of the present invention have found that the existing ME / MC-based interpolation frame generation method has two disadvantages: first, for some videos, due to the problem with the exposure control of the video capture device, the captured two frames of video There is a big difference in brightness. At this time, if ME is performed on the two frames of video before and after, a large number of misjudgments will be caused. In order to reduce the amount of calculation, ME often uses a fast search algorithm, and misjudgments will lead to the failure of the search algorithm. The number of times increases greatly, which greatly increases the amount of calculation, and the final result of the search is often wrong, which makes the effect of motion compensation interpolation frame worse

Second, for some videos with global motion, if there are large areas with similar textures in the video (such as the outer surface of a building with white tiles), the existing methods are prone to a large number of misjudgments, and the final interpolated video is in these Area prone to flickering, causing undesirable visual effects

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