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Method and device for image compression coding and decoding

A compression coding and image technology, which is applied in the field of image compression coding and decoding, can solve the problems such as the inability to eliminate the repetition of data volume and the inability to improve efficiency, and achieve the effects of reducing degradation, improving compression efficiency, and improving compression efficiency

Inactive Publication Date: 2008-06-04
LEJIN ELECTRONICS KUNSHAN COMPUTER CO LTD
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Problems solved by technology

However, the use of DCT information compression cannot eliminate the repetition of the space occupied by most of the data volume in the actual image, so there is a limitation that the efficiency cannot be improved

Method used

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  • Method and device for image compression coding and decoding
  • Method and device for image compression coding and decoding
  • Method and device for image compression coding and decoding

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Embodiment Construction

[0046] Embodiments of the present invention will be described below with reference to the drawings.

[0047] first, figure 2 Shown is the image compression encoding and decoding method of the present invention.

[0048] As shown in the figure, step S211 is a step of selecting seed pixels and forming a seed image. The digital image data is divided into blocks, and subpixels are selected in each block. For example, when performing division processing in units of macroblocks, pixel selection is performed within each macroblock. That is, a pixel located in the center of a macroblock is defined as a sub pixel. There is no restriction on selecting a pixel at a certain position on an appropriate macroblock as a seed pixel. In the selection of the sub-pixels, the applicable system features of the present invention may vary according to different communication or applicable environments. However, in general, it is ideal to select the pixel at the central position of the macrobloc...

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Abstract

The invention relates to a device and a method for compression coding and decoding of an image. The invention processes a digital image signal on the base of a macro-block. A seed pixel is selected on each macro-block to form a different image between the seed pixel and an around pixel, and the seed pixel is formed by inputting an image auxiliary sample according to a specific proportion. The seed image and the different image are respectively processed by discrete cosine transform and quantization and then are compressed. The compressed image data is coded in a lossless manner, and the image is processed by compression coding. The encoding data of the seed image and the different image are respectively decoded. After decoding, the image is decoded through the decoded image obtained by adding the two images in the last step. The invention only utilizes internal information of the image to conduct compression, thus removing the repeatability in the image internal space; therefore, the compression rate can be increased effectively.

Description

technical field [0001] The invention relates to a method and device for image compression encoding and decoding. Background technique [0002] Most video compression standards such as MPEG and H.26x series video coding basically adopt a compression method in terms of motion compensation techniques and conversion. In such motion compensation basic encoding, it is necessary to encode and transmit the motion vector information of each block, and the compression efficiency varies greatly depending on how the motion vector is encoded. [0003] In the general image encoding process, the image signal is processed by DCT (discrete cosine transform), the transform coefficient is quantized, and the lossless encoding is performed. The images are stored in the memory, motion vectors are generated using the images and image images stored in the memory, variable length coding is performed on the motion vectors, and a bit stream is formed together with the coded image information. The im...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N7/30H04N19/124H04N19/44H04N19/625
Inventor 金南浩
Owner LEJIN ELECTRONICS KUNSHAN COMPUTER CO LTD
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