Video coding and decoding device and method based on image block data rotating and transforming

Abstract

The present invention relates to a video encoding / decoding apparatus as well as a method for rotating and changing image block data. By means of the existing frequency field transformation method for remnant difference or original information, such as DCT / IDCT, the frequency field elements of the image block of sidelong borderline, goods as well as element after transformation are disperse, the concentration of low frequency point is not high, thus, the follow-up entropy encoding efficient will reduce. The present invention implements rotating processing to the sidelong borderline, object as well as element to make them be parallel / vertical to coordinates, or to make the sidelong borderline, object as well as element to be parallel / vertical to coordinates by means of implementing rotation to the coordinates; then to implement frequency transformation to the rotating image block, to make the frequency field elements fasten on the low frequency point, to improve the follow-up entropy encoding efficient.

Description

technical field [0001] The invention belongs to the technical field of image block information conversion, quantization, scanning and entropy coding in digital video encoding and decoding, in particular a video encoding and decoding device and method based on rotating and transforming image block data. Background technique [0002] Video coding technology mainly tries to represent a piece of video with as few information bits as possible, and the original image can be recovered or roughly recovered from these information bits. These information bits can be divided into side information and coefficient information. The side information can be motion vector, encoding mode, transform mode, etc.; the coefficient information refers to the residual value after transform encoding. In existing video standards, such as H.264 (the latest video codec standard of the International Telecommunication Union) and AVS (China's audio and video codec national standard), both intra-frame or int...

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Problems solved by technology

However, for the oblique boundaries, objects and elements in the image block, the transformed frequency domain elements are relatively scattered, and the concentration of low-frequency points is not high, which leads to the low efficiency of subsequent entropy coding, and finally reduces the compression rate of the coding system. reduce

How to improve the phenomenon of low entropy coding efficiency of transformed frequency domain elements when there are oblique boundaries, objects and elements in the image block is a problem that needs to be solved.

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