Downsampling decoding method for MPEG2-format video

Abstract

The invention relates to a downsampling decoding method for an MPEG2-format video, which comprises a downsampling inverse discrete cosine transform program and a downsampling motion compensation program, wherein the downsampling inverse discrete cosine transform program is used for transforming discrete cosine transform coefficients of a data block arranged in an 8*8 matrix mode into an YUV-format pixel value arranged in a 4*8 matrix mode in a representative image to obtain a home block with 1 / 2 horizontal dimension, and then is used for carrying out vertical 1 / 2 downsampling on the home block to generate an internal coded image with 1 / 4 resolution; the downsampling motion compensation program is used for carrying out motion compensation on the current home block by using the previously stored home block as the reference block so as to obtain a predicted data block with 1 / 2 horizontal dimension; a residual data block is obtained by using the method identical to the home block; the predicted data block is added to the residual data block to obtain an intermediate block which is arranged in a 4*8 matrix mode; and vertical 1 / 2 downsampling is carried out on the intermediate block to output a predicted coded image with 1 / 4 resolution and a bidirectional predicted coded image.

Description

technical field [0001] The present invention relates to a video decoding method, in particular to a method that can perform inverse discrete cosine transformation (Inverse Discrete Cosine Transformation, referred to as IDCT) program and Motion Compensation (Motion Compensation) program on MPEG2 format video at the same time. Down-sampling processing to greatly reduce the amount of data processing and computational complexity, and effectively increase the decoding speed to solve the problem of low efficiency when playing high-resolution video on low-performance processors. Background technique [0002] Video compression technology has sprung up since 1990. At that time, the video compression standard proposed by the ISO MPEG (Moving Picture Experts Groups) organization was the mainstream in this field. Until 1994, the ISO MPEG organization formulated the MPEG-2 After the standard, because the MPEG-2 standard adopts a relatively new compression technology, it can not only supp...

AI Technical Summary

Problems solved by technology

[0029] In view of the fact that many electronic devices have the characteristics of slow processor operation speed, small memory storage capacity and small display screen size, when using traditional MPEG2 video decoding methods to play high-resolution videos, the decoding cannot be completed quickly, and The problem of being unable to present video films and programs on the display screen in real time, the inventor finally developed and designed a method for down-sampling and decoding MPEG2 format video of the present invention after long-term hard research

Images