Adaptive macro-block grade code rate control system and control method for video compression

Abstract

The invention relates to an adaptive macro-block grade code rate control system and control method for video compression. The adaptive macro-block grade code rate control system for video compressionincludes an image segmentation module which is used for segmenting one frame of image into 16*16 macro-blocks, an image complexity calculation module which is used for inputting the segmented macro-blocks into the mage complexity calculation module and calculating the fluctuation change frequency of the image pixel value in the macro-block domain by calculating the absolute error sum of the pixelvalue in the frame of image and the pixel value in the area so as to obtain the image complexity MAD, and a macro-block quantization parameter calculation module which includes a precision selection module and a QP section determination module, wherein the preset section threshold, the precision control parameter and the image complexity MAD are input into the precision selection module to calculate the precision; and the macro-block image complexity MADout having determined the precision is sent to the QP section determination module to determine the QP section to which the macro-block belongs and calculate the macro-block QP offset, and the macro-block grade QP value can be obtained by stacking the frame grade QP with the macro-block QP offset, and then the adaptive macro-block grade code rate control can be realized.

Description

technical field [0001] The present invention relates to a code rate control system and method, in particular to an adaptive macroblock-level code rate control system and control method suitable for video compression, which is applied to macroblock-level code allocation control during video encoding and decoding, and belongs to video Codec technology field. Background technique [0002] Bit rate control in video coding directly affects bit stream bandwidth and image quality, is one of the important technologies of video coding, and plays an important role in applications such as video storage and transmission. Under the condition of meeting the bandwidth constraints of video transmission, improving the quality of encoded images and obtaining uniform image quality in line with human visual characteristics is an expected goal of bit rate control. [0003] In the currently existing video encoding rate control methods, in order to make the video output bit rate more accurate dur...

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Problems solved by technology

[0004] The present invention provides a method that can effectively improve the quality of video images, effectively solve the problem of distortion caused by video images during decoding, and can well eliminate the block effect caused by video image playback and decoding and the jamming phenomenon caused during video transmission. An adaptive macroblock-level code rate control system and control method suitable for video compression

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