Video compression/decompression device and method
A technology of a compression device and a compression method, which is applied to image communication, electrical components, etc., can solve the problems of poor output image quality, high software and equipment costs, and inability to display fax files.
Inactive Publication Date: 2005-09-07
PRIMAX ELECTRONICS LTD
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However, due to the limitations of the current use of fax machines, it also exposes its own problems: (1) the inhomogeneity of the resolution of the terminal
At present, due to the limitation of the resolution of general computer terminals, fax files cannot be displayed on the screen as a whole.
(2) There is no progressive function to browse image data immediately
The B method mentioned above is often applied to the compression of black and white data. Its advantage is that the bit correlation between the same bit planes is large, and it can have a high compression ratio. The disadvantage of this method is that the data needs to be divided and The processing of reorganization takes a long time and the cost of software and equipment is relatively high
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[0037] A digital image is represented by a two-dimensional array of pixels, where each pixel has a position in the image grid and, in the case of a color digital image, a color value. For the sake of clarity, only a 3×3 pixel black and white image 400 is shown in FIG. 4 , but in fact, an image should contain more pixels with more possible colors. For example, in one embodiment, an image It is formed by 1024×1024 pixels, and each pixel can be selected from a color wheel of 168,000 colors (24-bit color).
[0038] FIG. 4A is a 3×3 pixel image 400 formed by each pixel with a label indicating the position of the pixel in the image. The first number indicates the column position of the pixel, and the second number indicates the position of the pixel in the image. The row position of the pixel.
[0039] For the convenience of description, each pixel in Figure 4A is assumed to be represented by 4 bits, but in fact, the pixel can be represented by 2 bits, 6 bits, 8 bits, etc., dependi...
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The invention relates to a video compressing / decompressing device and method, and the device comprises: a video converter to convert each pixel in the input video data into a bit array with an a binary numerical value, where the same line in the bit array is on the same bit plane; a content mould, coupled to the video converter, comprising a content model sample plate and a content model and obtaining many reference content bits with the same bit plane from an input bit in the bit array, to be compressed; and an arithmetic coder, coupled to the content mould to cooperate with the content mould, so as to code the bit to be compressed, according to the information provided by these reference content bits.
Description
technical field [0001] The present invention relates to a data compression / decompression device and its method, in particular to an image compression / decompression method, the compressor used, the content mold contained in the compressor, and the content contained in the content mold Model templates and content models. Background technique [0002] Like static image compression, Joint Bi-level Image Group (JBIG) is basically a data processing method, and generally includes a restoration (decompression) method. However, its difference from static image compression is that binary image compression uses distortion-free compression, which can completely restore the compressed binary image. The most well-known binary image compression specifications in the past were mostly the compression standards of G3 and G4 facsimile machines. Under the strong demand of office automation, fax machines have become the new darling of office affairs machines. However, due to the limitation of...
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IPC IPC(8): H04N1/64
Inventor 姚舜晏毛清龙范美华
Owner PRIMAX ELECTRONICS LTD