Mosaic image compression method based on novel color space conversion

A color space conversion and mosaic image technology, applied in the field of image processing, can solve the problems of low quality of restored images and complex algorithms, and achieve the effect of eliminating correlation, improving restoration quality and reducing the number of bits.

Active Publication Date: 2020-09-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0005] The purpose of the present invention is to provide a mosaic image compression method based on a novel color space conversion for the problems of low image quality, complex algorithm and only applicable to a certain format of RGGB type CFA image in the prior art, which is simple to implement , can bring higher recovery quality under the condition of the same number of coded stream bits, and is suitable for RGGB type CFA in any format

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  • Mosaic image compression method based on novel color space conversion
  • Mosaic image compression method based on novel color space conversion
  • Mosaic image compression method based on novel color space conversion

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Embodiment Construction

[0042] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0043] This embodiment provides a mosaic image compression method based on novel color space conversion, and its process is as follows figure 1 Shown; The present embodiment takes Bayer-CFA as an example, specifically comprises the following steps:

[0044] Step S1, the G in the RGGB type CFA image 1 RBG 2 The components are combined into one channel separately, and become a four-channel model, so that each component forms a matrix independently, eliminating the complex structure of CFA;

[0045] Specifically, Bayer-CFA such as figure 2 As shown, the Bayer-CFA is divided into 2×2 pixel blocks; as image 3 As shown, select all the elements in the upper left corner of the 2×2 pixel block and combine them into G 1 Component, select all the elements in the upper right corner of the 2×2 pixel block to form the R component, select all the elem...

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Abstract

The invention belongs to the technical field of image processing, and particularly provides a mosaic image compression method based on novel color space conversion, which is used for solving the problems of low recovered image quality, complex algorithm and only suitability for an RGGB type CFA image in a certain specific format in the prior art. According to the method, the G1RBG2 of the CFA is converted into a four-channel model, and then novel color space conversion is used, so that the correlation between pixels is eliminated, the bit number of an encoding code stream is greatly reduced, and the encoding code stream can be encoded directly through a traditional encoding framework; in addition, the method is suitable for RGGB type CFA in any format; meanwhile, the color space conversionmatrix and the inverse conversion matrix are both true values instead of approximate results, so that rounding errors caused by the conversion matrixes are eliminated; in addition, the brightness component needing to be coded is updated in a mathematical optimization mode, and better recovery quality is brought.

Description

technical field [0001] The invention belongs to the technical field of image processing, in particular to the field of RGGB type CFA compression coding, and specifically provides a mosaic image compression method based on novel color space conversion. Background technique [0002] To produce color images, most digital cameras use a CMOS board with several different color filters and use interpolation techniques to produce full-color images. RGGB color filter array (Color Filter Array, CFA) refers to the general term of CFA with two green color filters, one red color filter and one blue color filter in a 2×2 area; among them, Bayer-CFA is the most commonly used , in each 2×2 region, the upper left and lower right are green color filters, the upper right is red color filter, and the lower left is color filter. If a full-color image is interpolated, there is only one color component in each pixel of the CFA, so the other two color components of a given pixel must be interpolat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/186H04N19/625
CPCH04N19/186H04N19/625
Inventor 朱树元贺康王忠荣刘光辉王正宁
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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