Method of entropy coding of transformation coefficient in image/video coding

Abstract

The invention belongs to the field of picture / video coding / decoding in the signal processing, relating to an entropy coding method of conversion coefficient in the picture / video coding. The invention extracts the position information and value information of non-zero coefficients from a string of coefficients scanned to make the variable-length coding, and as coding the position information, combines the continuous zero coefficients and non-zero coefficients into two- dimensional combined pairs of zero-coefficient travel and non-zero-coefficient travel and makes variable-length coding on them, and as coding the value information, combines the continuous plus or minus 1 and the values or absolute values of the back coefficients with the absolute values greater than 1 into two-dimensional pairs of the travel of plus or minus 1 and the said value or absolute value, and makes the variable-length coding on them, or uses 1 bit to indicate if the absolute values of the string of non-zero coefficients are all 1. The invention makes further use of the statistical properties in the position information and the value information of the non-zero coefficients, thus obtaining a prior compressing performance to that of the existing entropy coding method.

Description

technical field

[0001] The invention belongs to the field of image / video coding and decoding in signal processing, in particular to entropy coding of scanned coefficients in image / video signal coding. Background technique

[0002] In existing image / video encoding methods, an image of a video sequence is generally divided into several blocks for encoding, and said block is a set of pixels in the image as the basic unit of encoding, and the number of pixels is greater than or equal to A collection of pixels with a square, rectangular or arbitrary shape boundary. The coding steps generally include prediction, transformation, quantization, scanning and entropy coding. Among them, the entropy coding method usually scans the transform coefficients into a coefficient string according to certain rules, and then performs variable-length coding on the coefficient string.

[0003] The entropy coding method adopted in the international video coding standard MPEG-2 is to first combine ...