Automatic color correction matrix algorithm based on the least square method

A technology of least squares and color correction, applied in the field of image processing, which can solve the problems of insufficient hardware precision, error, discrete vision of the photosensitive curve, etc.

Active Publication Date: 2018-03-27
TIANJIN TIANDY DIGITAL TECH
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Problems solved by technology

However, there are problems such as visual errors caused by factors such as insufficient hardwa

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  • Automatic color correction matrix algorithm based on the least square method
  • Automatic color correction matrix algorithm based on the least square method
  • Automatic color correction matrix algorithm based on the least square method

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[0022] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0023] The present invention will be described in detail below in conjunction with examples.

[0024] An automatic color correction matrix algorithm based on the least square method, the process is as follows:

[0025] First, according to the RAW data of ISO12233 of the target image and the comparison image, two sets of color correction matrix (Color Correction Matrix, hereinafter referred to as CCM) CCM are extracted. dest and CCM source . It can be seen from the formula:

[0026] CCM dest =K*CCM Source

[0027] Where K is a 3 by 3 coefficient matrix, and the element in row i and column j in the matrix is ​​k ij .

[0028] so k ij The polynomial representation of is as follows:

[0029]

[0030] where a ij for CCM dest The element in row i and column j in the matrix; and b ji for CCM Source...

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Abstract

The invention provides an automatic color correction matrix algorithm based on the least square method. The algorithm performs sampling statistics on two images with differences, outputs respective standard color correction matrixes, and fits a polynomial matrix satisfying the difference of sensors according to the basic principle of the least square method. The problem of visual error caused by insufficient precision of the sensor, the optical filter, the lens and other hardware, and such factors as sensitometric curve discreteness is solved.

Description

technical field [0001] The invention belongs to the field of image processing, in particular to an automatic color correction matrix algorithm based on the least square method. Background technique [0002] With the in-depth development of image fusion technology, more and more fields have begun to use image fusion technology, but due to the lack of hardware precision such as sensors, filters, lenses and other factors such as the discreteness of the sensitivity curve, the spliced ​​image and There will be differences in color and brightness between images, which will affect the image effect of the entire splicing and fusion. [0003] The existing color correction matrix is ​​to restore the deviation between the RGB components and the human eye's response to the spectrum due to the corresponding difference of the CMOS and other image sensors for the spectrum. Usually, a color correction matrix is ​​used to correct the cross-response and response intensity of the spectral res...

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Application Information

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IPC IPC(8): H04N1/60H04N9/67
CPCH04N1/6033H04N1/6077H04N9/67
Inventor 王景彬张帆王思俊石行
Owner TIANJIN TIANDY DIGITAL TECH
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