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Method for encoding and decoding Bell formwork image

A template image and decoding method technology, which is applied in image communication, television, electrical components, etc., to achieve the effect of less hardware resources, easy hardware implementation, and small amount of calculation

Inactive Publication Date: 2009-05-27
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0005] In order to solve the problem that the existing method of directly compressing the original Bell template image data is difficult to achieve a good balance between the compression ratio, the quality and complexity of the reconstructed color image, the present invention provides a Bell template image encoding and decoding method

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  • Method for encoding and decoding Bell formwork image
  • Method for encoding and decoding Bell formwork image
  • Method for encoding and decoding Bell formwork image

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Embodiment Construction

[0034] Bell template image encoding and decoding method, including encoding and decoding process, the encoding process comprises the following steps: 1, separate the red, green and blue components in the Bell template image, and turn the separated red and blue components into a compact rectangular image, and the green component Keep it as a quincunx-shaped image; 2. Losslessly compress the green component data, the first step: use the method of causal interpolation to estimate the left side and For the missing green pixel value at the upper pixel position, the estimated value of the green pixel at the left pixel position of each current original green pixel to be encoded is equal to the average value of the original green pixel values ​​at the left and upper of the pixel position, and each current original green pixel to be encoded The green pixel estimate for a pixel position above the pixel is equal to the average of the original green pixel values ​​to the left and right of ...

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Abstract

The invention relates to digital image compression technology, in particular to a method for encoding and decoding Bayer patter images, and aims to solve the problem of the difficult establishment of good balance between compression ratio, quality and complexity of restructured color images in the prior method which compresses Bayer pattern image data directly. The invention uses LOCO-I technology to perform lossless encoding for a green component; and through estimation of the green component on the site of a red-blue component by a gradient interpolation method, a color difference signal between the small-wave low-frequency subband of the red-blue component and the low-frequency subband of the estimated green component can be acquired, and can undergo lossless or nearly lossless compression by the LOCO-I technology. At the decoding end, the lossless green component should be obtained firstly, then the green component on the site of the red-blue component is estimated through an process identical to the encoding process; the small-wave high-frequency subband of the estimated green component can replace the corresponding small-wave high-frequency subband of the red-blue component, and the rest part is a reverse process of encoding. The method is characterized by high efficiency and low complexity.

Description

technical field [0001] The invention relates to a digital image processing technology, in particular to a digital image compression technology, specifically a Bell template image encoding and decoding method. Background technique [0002] With the wide application of image sensors similar to Bell color filter array (referred to as Bell template) in digital cameras and video cameras, in order to improve the storage and transmission efficiency of digital images, image data compression technology is becoming more and more important. [0003] In traditional digital camera products, the digital image with similar Bell template format (referred to as Bell template image) is interpolated to estimate the other two missing color values ​​at each pixel position, thereby obtaining full-color image data, and then Use JPEG2000 or JPEG international standard based on wavelet transform to compress the interpolated full-color data. Obviously, this traditional method produces new data redun...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N1/64H04N11/02H04N19/63
Inventor 程永强贾新泽续欣莹赵江
Owner TAIYUAN UNIV OF TECH
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