A quick selection method for macro block mode

Abstract

The invention relates to a rapid selection method of macro-block mode during video information processing procedure, particularly a rapid selection method suitable for P-slice macro-block mode. The method comprises the following steps: step 1, determining the size of continuous macro-block according to the size of on-chip memory in the beginning, dividing all macro-blocks in one frame into a plurality of continuous 16is multiplied by16 macro-blocks, all macro-blocks in each continuous macro-block being positioned in the same row in the same one frame, and distributing the desired on-chip buffer zone; step 2, copying the brightness and colority data required for the mode selection of continuous macro-blocks in the current frame and the reference frame to the on-chip buffer zone; step 3, calculating the mode of each macro-block in the continuous macro-blocks to determine the final mode of each macro-block; and step 4, if all macro-blocks in the current continuous macro-block are processed, stopping the selection procedure of the current continuous macro-block, otherwise returning to the step 1 to continue. The inventive technical proposal can efficiently accelerate the speed of video compression and calculation, thereby realizing the real-time compression of video.

Description

technical field [0001] The invention relates to a method for quickly selecting a macroblock mode in the process of video information processing, in particular to a method for quickly selecting a macroblock mode suitable for P-slices. Background technique [0002] AVS (Audio-Video Standard) digital audio and video codec technical standard is the common basic technical standard of digital audio and video industries such as digital TV, high-definition video disc, streaming media and multimedia in my country, and represents the current international advanced level. H.264 is a new generation of video compression coding standard formulated by the Joint Video Team (JVT) composed of ISO / IEC and ITU-T. Based on the previous video compression standard, H.264 has introduced many advanced technologies and is currently recognized internationally. One of the advanced video technology standards. [0003] P-slice is the most commonly used slice in standards such as AVS and H.264. AVS, H.26...

AI Technical Summary

Problems solved by technology

From the perspective of the prior art, there are mainly the following methods for the selection of the macroblock mode: (1) rate-distortion optimization (RDO: Rate-DistortionOptimization) method is used to calculate the rate-distortion cost (RDCost: Rate-DistortionOptimization) of various macroblock modes Cost), and take the mode with the smallest rate-distortion cost as the final coding mode. This method improves the coding efficiency and image quality, but it needs to calculate the rate-distortion optimization for each possible macroblock mode, which makes the calculation amount sharply. Increase

(2) Calculate the cost function value according to the motion search, and select the macroblock mode with the smallest value as the final mode. This method can ensure the quality of the decoded image well, but the amount of calculation is also very large, making motion estimation an integral part of the process. One of the most time-consuming parts of video encoding

(3) The degree of detail of the macroblock image is used to divide the macroblock of the Inter mode into subblocks, thereby determining the final mode of the inter macroblock (the subblock type of the inter macroblock). The calculation amount of this method is small, but not It is easy to make a choice between intra or inter coding mode, so that the macroblock mode of p-slice cannot be effectively selected

Images