Image data accessing and decoding method and decoding device

Abstract

An access method of image data includes storing multiple pixel line of image block into one line of storage space, automatically switching line when storage edge in met and calculating composite address of said image block, continuously storing data of the other image block at blank position of this line storage space if a line space in not fully occupied by data of said image block, picking up data of said image block according to composite address of said image block. Two decoding methods of image data and their devices are also disclosed.

Description

technical field [0001] The invention relates to image processing technology, in particular to image data access and decoding method and decoding device. Background technique [0002] In the currently widely used video image compression standards, the compression ability of moving images is largely due to the motion estimation algorithm adopted, that is, the 16×16 pixel block is defined as a macroblock (MB), and the coding Select some frame images from the video frame sequence as reference frames, and completely encode the pixel data of these reference frames in units of macroblocks; while encoding other non-reference frames, also use macroblocks as units to encode First find out the part most similar to the current macroblock to be coded in the reference frame, and calculate the displacement between the position of the current macroblock in the frame map and the position of the found most similar part in the frame map , the displacement is called the motion vector, and the ...

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Problems solved by technology

[0005] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art : the method is fixedly allocating a row of storage space of a group to a window, and the window probably does not fully occupy the row, which leads to a waste of storage space and increases the area of ​​the memory chip

Moreover, the extraction and reconstruction of image data in this method are performed continuously in order, that is, the method of extracting reference data first and then reconstructing and then extracting, which causes the bus resources to be idle when reconstructing the image, and the bus is not fully utilized.

[0006] In addition, the complex address calculation of this method also occupies a large bus bandwidth, reducing the utilization of the bus

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