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

A video encoding and decoding, image block technology, applied in the direction of digital video signal modification, image communication, television, etc., can solve the problems of reduced compression rate of encoding system, scattered elements in frequency domain, low concentration of low frequency points, etc., and achieves entropy encoding efficiency. The effect of improving and improving the compression ratio

Inactive Publication Date: 2008-04-02
张燕生 +1
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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 fina

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

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[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] In Figure 1, the digital TV image is divided into 16×16 macroblocks, and each macroblock is further divided into 8×8 or smaller blocks. Encoding is performed one by one from left to backward in the order of macroblocks. Perform intra-frame or inter-frame prediction for each image block according to standard regulations, perform frequency domain transformation on the predicted residual or original information coefficients, and then perform quantization, scanning and entropy coding on the transformed frequency domain coefficients.

[0025] Please refer to FIG. 2 for the main flow chart of the present invention. First, perform intra-frame or inter-frame prediction on each image block, and generate coefficient residuals or original information in FIG. 2-1. Perform oblique boundary on the predicted residual or original information ...

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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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Application Information

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IPC IPC(8): H04N7/26H04N7/32H04N19/547H04N19/55H04N19/60
Inventor 张燕生李革
Owner 张燕生
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