Intra-frame coding method based on rolling hush and block-level intra-frame prediction

A technology of intra-frame prediction and intra-frame coding, which is used in television, electrical components, image communication, etc., and can solve problems such as insufficient utilization.

Inactive Publication Date: 2013-09-04
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0007] However, none of the above methods can take full advantage of the large number of image block repetitions in the screen image—that i

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  • Intra-frame coding method based on rolling hush and block-level intra-frame prediction
  • Intra-frame coding method based on rolling hush and block-level intra-frame prediction
  • Intra-frame coding method based on rolling hush and block-level intra-frame prediction

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Embodiment 1

[0044] Such as figure 1 As shown, this embodiment includes the following steps:

[0045] In step 1, it is first necessary to select an appropriate coding block size T and W. If the coding block is selected too large, the possibility of finding repeated blocks in the image will be reduced, but if the coding block is selected too small, the number of blocks to be coded will increase, thereby increasing the total number of coded information to be transmitted. According to the experimental results, it is relatively appropriate to choose 8x8.

[0046] Step 2: Add appropriate numbers of pixel columns and pixel rows to the right and bottom of the input image, respectively, the numbers are W columns and T rows, and the pixel values ​​are arbitrary. This step is for subsequent processing when the currently processed pixel segment or image block part exceeds the boundary of the original image without special processing.

[0047] Step 3: Calculate the BUZ hash values ​​of all pixel s...

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Abstract

The invention provides an intra-frame coding method based on a rolling hush and block-level intra-frame prediction of the technical field of image processing. A hash function with a rolling type calculation characteristic and a corresponding rolling type algorithm are selected and utilized to set up an image block lookup table about positional information contained in an image coded area of various image blocks with different pixel contents and hash values of the pixel contents of the image blocks, the image block lookup table is used for judging whether a current image block to be coded is a stored image block in the image block lookup table or not, and two-tuples further serve as coding information of the current image block to be coded or adding is carried out on the image block lookup table. According to the intra-frame coding method, a number of repeated image blocks existing in screen images are fully utilized to further improve intra-frame compressibility, on the premise that calculation expenditures at worst are guaranteed, little calculation expenditures are used for determining whether a prediction block the same as the current image block to be coded exists in the image coded area or not, and when a number of repeated image blocks exist in the screen images, the intra-frame coding method can obtain higher compressibility compared with an existing method.

Description

technical field [0001] The present invention relates to a method in the technical field of image compression processing, in particular to an intra-frame encoding method based on rolling hash and block-level intra-frame prediction. Background technique [0002] Intra-frame coding refers to a type of coding method that does not need to rely on information in other frames when coding a certain area of ​​a frame of image. The intra coding method plays an important role in various video coding and still image coding. [0003] The image sequence processed by video coding technology can be divided into natural scene video (Natural Scene) and screen video (Screen Content) according to its signal source. The former refers to a sequence of images captured from the physical world; the latter refers to a sequence of computer-generated images displayed on a screen. In the encoding of screen video, since the screen video has less movement between frames, its overall compression rate mai...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/32
Inventor 谢伟凯鲁晨平申瑞民
Owner SHANGHAI JIAO TONG UNIV
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