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JPEG (Joint Photographic Experts Group) compression method and device of color digital image

A technology of digital image and compression method, applied in the direction of color TV with pulse code modulation, etc., can solve the problems of large cost burden and occupying a large area

Active Publication Date: 2013-06-19
BYD SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Here two 8-row SRAMs occupy a large area in the system-on-chip (SOC) chip design, resulting in a large cost burden

Method used

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  • JPEG (Joint Photographic Experts Group) compression method and device of color digital image
  • JPEG (Joint Photographic Experts Group) compression method and device of color digital image
  • JPEG (Joint Photographic Experts Group) compression method and device of color digital image

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Embodiment Construction

[0021] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0022] figure 2 It is a flowchart of a color digital image JPEG compression method according to an embodiment of the present invention. As shown in the figure, firstly, the luminance data and chrominance data of the digital image are serially input row by row into a memory having n rows (step 102 ). The n rows here are the minimum number of rows required to form an 8*8 luma data block and an 8*8 chrominance data block. For example, for JPEG compression of color digital images in YUV422 format, n is 8. Specifically, a basic unit (MCU)...

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Abstract

The invention discloses a JPEG compression method of a color digital image, which comprises the following steps of: inputting brightness data and chromaticity data of the image in series to n rows of storage devices continuously in rows; carrying out primary one-dimensional DCT (Discrete Cosine Transform) of the brightness data and the chromaticity data in series correspondingly when data of row n are sequentially inputted into the storage devices; respectively setting the brightness data and the chromaticity data which are outputted in a transforming mode into a first channel and a second channel so as to execute correspondent secondary one-dimensional DCT, quantification and coding processing in parallel; and correspondingly fusing data flow processed in the first channel and the secondchannel respectively according to a time sequence and buffering the data flow to the storage devices so as to sequentially output the data flow. The invention can reduce the required space of the storage devices during JPEG compression.

Description

technical field [0001] The invention relates to digital image compression technology, in particular to a JPEG compression method for color digital images. Background technique [0002] The structure of the traditional Joint Photographic Experts Group (JPEG) compression algorithm usually includes four parts. [0003] The first part is the two-dimensional discrete cosine transform (DCT): as figure 1 As shown, the 8*8 block data generated by the static memory (SRAM) storage (block 14) is divided into two one-dimensional cosine transforms (corresponding to block 12 and block 16) and serially implemented, and finally a useful The information is mainly concentrated in the two-dimensional array in the upper left corner. [0004] The second part is quantization (corresponding to figure 1 Box 18): Quantization is an important step to achieve data compression. Select the quantization table to quantize the frequency coefficients obtained through two-dimensional DCT transformation, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N11/04
Inventor 彭茂肖本懿胡文阁
Owner BYD SEMICON CO LTD