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Method, system and software product for color image encoding

A color image and product technology, applied in the field of color image coding, can solve problems such as reducing the compression rate

Active Publication Date: 2007-10-31
BLACKBERRY LTD
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Problems solved by technology

[0005] On the other hand, when encoding is considered, it is usually assumed that the palette and pixmap are given, and the aim is to design efficient codes for indexed sequences in order to reduce the compression ratio

Method used

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  • Method, system and software product for color image encoding
  • Method, system and software product for color image encoding
  • Method, system and software product for color image encoding

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Embodiment Construction

[0018] Referring to FIG. 1, a block diagram of a computer system 10 is shown in accordance with aspects of the present invention. The computer system includes: a memory 12 for storing color image data; a monitor 14 for displaying digital color images; a CPU 16 for image processing, and while maintaining low computational complexity and compatibility with GIF / PNG decoders Simultaneously, compression of color data jointly optimizing quantization, distortion and compression weights is provided; The data is encoded.

[0019] The joint optimization problem of color image coding can be defined as follows: Set Ω={(r, g, b)|0≤r, g, b≤255} is the RGB color space. Suppose O={o 1 , o 1 ,...,o N-1} is the palette of the original color image with N different colors. If the total number of pixels in the original image is n, the index sequence I=(i 0 , i 1 ,...,i n-1 ), where i k The color vector representing the kth pixel is o ik . If it is restricted to reproduce the original co...

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Abstract

The present invention relates to the compression of color image data. A combination of hard decision pixel mapping and soft decision pixel mapping is used to jointly address both quantization distortion and compression rate while maintaining low computational complexity and compatibility with standard decoders, such as, for example, the GIF / PNG decoder.

Description

technical field [0001] The invention relates to a color image coding method, system and software product. Background technique [0002] In recent years, the amount of color image data on the Internet has grown rapidly. In particular, color image data has become a major part of Internet traffic due to the accelerated popularity of web pages, digital video cameras, and online games. On the other hand, accessing color images through wireless channels or through low-power small devices is still time-consuming and inconvenient, mainly due to limitations in image display devices, storage and transmission bandwidth that become the bottleneck for most multimedia applications, see for example J .Barrilleaux, R.Hinkle and S.Wells, "Efficient vector quantization for color image encoding," Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP'87, vol.12, pp740-743, April 1987 (hereinafter referred to as "Reference [1]"), M.T.Orchard and C.A.Bouman, "Color q...

Claims

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Application Information

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IPC IPC(8): G06T9/00G06T9/40H04L12/28H04N7/26
CPCH04N19/00969H04N19/00315H04N19/00963H04N19/00096H04N19/00139H04N19/00351G06T9/40H04N19/126H04N19/136H04N19/186H04N19/19H04N19/96H04N19/94H04N1/41
Inventor 杨恩辉曾剑分
Owner BLACKBERRY LTD
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