Bit rate control video compression method and device on basis of scene switching

Abstract

The invention relates to a bit rate control video compression method and a bit rate control video compression device on the basis of scene switching. When a video is input, a scene switching algorithm is used for calculating whether the scene switching occurs or not; if the scene switching occurs, IDR (Instantaneous Decoding Refresh) frames are inserted and a subsequent bit rate is recalculated; and if the scene switching does not occur, the calculation is carried out according to a normal method and QP value information obtained in the compression encoding calculation is regulated according to information of a macro block obtained after the previous scene switching. Compared with the prior art, the algorithm disclosed by the invention has the advantages that the number of I frames is notadditionally increased; bit rate resources can be effectively saved; and the encoding quality of each subsequent frame of scene switching frames and the encoding quality of an integral sequence are also effectively improved.

Description

technical field [0001] The invention belongs to the technical field of video compression coding, and in particular relates to a video compression method and device based on scene switching with code rate control. Background technique [0002] Rate control technology plays an important role in bandwidth-limited multimedia communication systems. Traditional video communication bit rate control algorithms, such as the bit rate control algorithm used in H.264 / AVC encoders, only consider each frame image itself when allocating bit rate resources to each frame image in a group of pictures (GOP). However, the correlation between each frame image in the GOP is ignored. For example, when encoding a video sequence with frequent scene switching, a certain frame image in the GOP may have no relationship with its reference frame due to scene switching. Correlation, if the traditional code rate control method is still used, it will lead to waste of image coding resources and degradation ...

AI Technical Summary

Problems solved by technology

Because the GOP is too long, it is easy to cause buffer overflow, and cause the encoding performance of the latter part of the GOP to degrade

In the algorithm proposed above, this problem is solved by splitting the overly long GOP into two new GOPs, but the result of this is that an I frame is added, resulting in a waste of bit rate resources

[0006] In the video compression algorithm, the general video compression algorithm does not mention the requirements for scene switching. Due to the use of a fixed-length group of pictures (GOP) structure, it cannot effectively handle the scene switching in the video sequence, resulting in the scene switching frame subsequent The encoding quality of each frame is severely degraded

Although the existing X.264 video compression coding algorithm has done some detection for scene switching, not all scene switching can be detected correctly, and IDR frames are not used every time for images with scene switching detected. (Instantaneous Decoding Refresh instant decoding refresh) to re-encode

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