Method and system for coding, decoding and reconstructing video image blocks

Abstract

The invention discloses a method and a system for coding, decoding and reconstructing video image blocks, wherein the coding method comprises the following steps: selecting a prediction mode, and generating predicted blocks according to the reconstructed pixels around image blocks; calculating the difference between the pixels corresponding to the image blocks and the predicted blocks to obtain residual values, wherein all the residual values constitute a residual block; selecting the arrangement sequence of at least one residual value from a group of rearrangement sequences of the residual values to be selected, and rearranging the residual values in the residual block; transforming the rearranged residual block by selecting a transformation function to obtain the indication of the transformation coefficient of the residual block; and further scanning, quantifying and carrying out entropy-coding on the transformation coefficient. By rearranging the residual sampling values in the residual block in a null field, the characteristics of residual statistics in different modes can be similar or identical, thus achieving the performance similar to the transformation related to the modes by using fewer transformation functions and reducing the storage complexity of a coder and a decoder at the same time.

Description

technical field [0001] The present invention relates to the field of image coding, in particular to a method and system for coding, decoding and reconstructing video image blocks. Background technique [0002] Under the framework of existing video coding standards, the new generation of video coding standard H.264 / AVC has greatly improved the coding efficiency and will become the mainstream standard of video information compression format in the future. [0003] In a video encoder, video data is first divided into several 16×16 blocks, each of which is called a macroblock (Macroblock), and the process of video coding is based on a macroblock (Macroblock) unit carried out. In the process of encoding a macroblock, the encoder will further divide the macroblock into multiple smaller units, such as 16 4×4 blocks, such as figure 1 as shown, or four 8×8 blocks, etc. Take the intra-frame coding of 4×4 blocks in H.264 / AVC as an example, such as figure 2 As shown, the encoder fi...

AI Technical Summary

Problems solved by technology

These methods have significantly improved the performance of H.264 / AVC intra-frame coding, but at the same time increased the complexity of the encoder and decoder. One of the main aspects is that the significant increase in the number of transform functions leads to higher codec performance. storage complexity

Images