Image encoding and decoding method and encoding and decoding device

Abstract

The embodiment of the invention provides an image encoding and decoding method and an encoding and decoding device, wherein the image encoding and decoding method comprises the steps of determining a second length according to the direction of a division line, a ratio value and a position parameter value, wherein the second length is the distance from a corresponding point of a point of an image block on the boundary of the image block to an end point of the division line; the end point of the division line is an intersection point of the division line and the boundary of the image block or a prolonged line of the boundary; the position parameter value indicates the position of the end point of the division line in the reference direction opposite to a reference end point; determining a division mode of the image block according to the direction of the division line, the first length, the second length and the ratio value; encoding the image block according to the division mode of the image block, wherein the first length is the distance from the point of the image block to the boundary of the image block; and encoding a direction reference value, the ratio value and the position parameter value. By using the technical scheme provided by the embodiment of the invention, the complexity of an image encoding end for determining the division mode of the image block can be reduced.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular to an image encoding and decoding method and encoding and decoding equipment. Background technique [0002] In order to minimize the bandwidth required to transmit video data, multiple video compression methods can be used to compress video data, wherein the video compression methods include: intra-frame compression and inter-frame compression. Nowadays, the inter-frame compression method based on motion estimation is mostly used. Specifically, the image coding end uses the inter-frame compression method to compress and encode the image. The process includes: the coding end divides the image block to be encoded into several sub-image blocks of equal size , and then for each sub-image block, search for the image block that best matches the current sub-image block in the reference image as the prediction block, and then subtract the sub-image block from the correspond...

AI Technical Summary

Problems solved by technology

Since there are more than one modes of arbitrary block division, for example, for a 16x16 size image block, if the above-mentioned angle θ increases from 0 to 360 degrees in units of 11.25 degrees, the distance ρ increases from 0 to 8 in units of 1 (image half of the side length of the block), then there are (360 / 11.25)x8=256 division methods in total. If all division methods need to be fitted by the above formula, the complexity of determining the division method of the image block at the image encoding end will be increased.

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