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A bayer image compression method

An image compression and image technology, applied in the field of image processing, can solve the problems of unfavorable real-time image compression of space cameras, reduce the quality of restored images, and increase the number of coding bits, so as to reduce the computational complexity, eliminate the correlation, and reduce the number of bits. Effect

Active Publication Date: 2021-08-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Although there are several possible interpolation algorithms, they all lead to increased redundancy from an information-theoretic point of view
[0003] At present, most of the CMOS image compression methods on civilian digital cameras are image compression after the image is interpolated. The amount of compressed data is three times that of the original Bayer image, which is not conducive to the real-time performance of space camera image compression. The existing Bayer image compression method , or convert two green pixels into one, which reduces the quality of the restored image, or design a complex structural transformation for the Y matrix, which increases the number of bits required for encoding

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Embodiment Construction

[0067] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0068] The present invention provides a kind of Bayer image compression method, wherein involves one-dimensional DCT change, known one-dimensional DCT change can be expressed in matrix form:

[0069]

[0070] Among them, C represents the transformation matrix, y represents a vector composed of significant digits, x represents a vector composed of values ​​to be inserted, and the coefficients with the highest frequencies in the DCT domain are 0, then:

[0071]

[0072] change the location of the x interpolation such that C 11 The condition number is the smallest, assuming C 11 When the condition number is minimum denoted as P n ,but:

[0073] x=P n *y

[0074] Among them, n is the number of valid digits.

[0075] Based on this, the Bayer image compression method in the present embodiment is as figure 1 shown, including the follow...

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Abstract

The invention belongs to the technical field of image processing, and is specifically a Bayer image compression method; to overcome the existing Bayer image compression method, either two green pixels are converted into one, which reduces the quality of the restored image, or it is designed for the Y matrix Complex structural transformations increase the number of bits required for encoding. In the present invention, firstly, by G of the Bayer image 1 RBG 2 The color arrangement is transformed to a new color arrangement Y 1 UVY 2 , eliminates the correlation of the RGB color space, can improve the compression ratio, and ensure the quality of the restored image; then, do DCT transformation on the Y matrix by rearranging-column filling-column DCT-row filling-row DCT without any loss At the same time, the existing information reduces the number of bits required for encoding the Y matrix; in summary, the present invention has a larger compression ratio under the condition of the same restored image quality, and the method is simple, which significantly reduces the computational complexity.

Description

technical field [0001] The invention belongs to the technical field of image processing, in particular to a Bayer image compression method. 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. Of the several different color filter arrays (CFAs), the Bayer-CFA being the most commonly used, there is only one color component in each pixel, so the other two color components for a given pixel must be interpolated using neighboring pixel information. Although there are several possible interpolation algorithms, they all lead to increased redundancy from an information-theoretic point of view. [0003] At present, most of the CMOS image compression methods on civilian digital cameras are image compression after the image is interpolated. The amount of compressed data is three times that of the original Bayer image, which is not conducive to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/625H04N19/182H04N19/186H04N19/124H04N19/42
CPCH04N19/124H04N19/182H04N19/186H04N19/42H04N19/625
Inventor 朱树元贺康刘光辉曾兵
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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