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Image compression / decompression method and system

An image compression and decompression technology, applied in the field of computing, can solve the problems of high cost and poor real-time performance of pure hardware methods, and achieve the effect of reducing design difficulty, low cost and high real-time performance

Active Publication Date: 2009-12-23
ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD
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  • Claims
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Problems solved by technology

[0049] The purpose of the present invention is to provide a high real-time and low-cost image compression / decompression method and system to overcome the problems of poor real-time performance of pure software and high cost of pure hardware in the prior art

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  • Image compression / decompression method and system
  • Image compression / decompression method and system
  • Image compression / decompression method and system

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Embodiment Construction

[0109] Below according to accompanying drawing and embodiment the present invention will be described in further detail:

[0110] according to figure 1 , the present invention includes a DCT module 1, a quantization module 2, a Zig-Zag scanning module 3, a HUFFMAN module 4, a stream sorting module 5 which are sequentially connected, a memory 6 and a main control module 7.

[0111] like figure 1As shown, the DCT module 1 performs discrete cosine transform and inverse transformation on the data, the quantization module 2 completes the quantization or dequantization calculation of the data, the Zig-Zag scanning module 3 completes the concatenation or deserialization of the data, and the HUFFMAN module 4 completes the HUFFMAN of the data Encoding or decoding, the code stream finishing module 5 completes the packing or subpackaging of data;

[0112] like figure 1 As shown, relevant entries are stored in memory 6, wherein the entries include quantization tables QT0-DC, QT0-AC, QT...

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Abstract

The system comprises: a DCT module, a quantization module, a Zig-Zag scan module, a HUFFMAN module, and a bit-stream processing module. It also comprises a memory module and a main control module. The main control module is used for controlling the working state of each working module and completing the block-truncation-coding for the original image or extracting compressed data block; said main control module calls the list items in the memory, and loads the information to the quantization module and HUFFMAN module. The compression method comprises: a) leading in the quantization table and the HUFFMAN coding table; b) extracting the data unit, and sending it to DCT module; c) DCT module make discrete cosine transform for the data unit; d) quantization module makes quantization calculation for the data unit to the quantization coefficient; e) Zig-Zag scan module makes Zig-Zag scan for the coefficient; f) making HUFFMAN coding for the coefficient; after HUFFMAN coding, the package is made for the data to complete the compress.

Description

technical field [0001] The present invention relates to computing, in particular to an image compression / decompression method and system. Background technique [0002] JPEG (Joint Photographic Experts Group) is an international standard that uses digital methods to compress still pictures, which emerged in the 1990s. The compression ratio can be as high as about ten times. Still picture compression-decompression standard devices or circuits have become an integral part of these devices. [0003] When compressing, the original image data needs to be converted from RGB Color domain to YUV or YCbCr domain. The entire JPEG compression standard is defined in the YUV domain rather than the RGB domain. The definition in the YUV domain is due to the use of human visual characteristics. Y becomes Luminance, while U and V become Chrominance, because the number of light-sensitive cells and color-sensitive cells in the human eyeball is comparable. The degree of difference (the sensit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N1/41H04N19/122H04N19/124H04N19/129H04N19/156H04N19/176H04N19/423
Inventor 倪武学李小明
Owner ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD
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