Method for computing perceptible distortion of color image based on DCT field
A color image and calculation method technology, applied in image communication, television, electrical components, etc., can solve the problems that the calculation accuracy needs to be further improved
Inactive Publication Date: 2010-01-06
WUHAN UNIV
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For example, document 2 (see: Yang Hongmei, Liang Yongquan, Liu Lianshan, Ji Shujuan. Evaluation method for visual imperceptibility of color image watermarking based on HVS [J]. Journal of Communications, 2008, 29(2): 95-100.) combines RGB The masking characteristics of color space on vision, a calculation method of JND value of color image is given, but this method does not fully consider the influence of various characteristics such as CSF function, frequency coefficient characteristics, brightness adaptation and contrast masking for color images, Therefore, the calculation accuracy needs to be further improved
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[0052] Below in conjunction with accompanying drawing, the present invention will be further described with specific embodiment:
[0053]The method for calculating perceivable distortion degree of color image based on DCT domain provided by the present invention adopts the following technical scheme, see figure 1 The flowchart shown includes the following steps:
[0054] Step S1: converting the selected color image from RGB color space to Lab color space;
[0055] Step S2: Perform 8×8 DCT transformation on the three components of L, a, and b in the Lab color space, and transform them from the spatial domain to the DCT domain;
[0056] Step S3: In the DCT domain, calculate and obtain the perceived distortion JND value of the luminance component L according to the product of the luminance basic threshold and the modulation factor;
[0057] Step S4: In the DCT domain, calculate and obtain the perceived distortion JND value of the chrominance components a and b according to the ...
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The invention belongs to the technical field of video image communication, in particular to a method for computing the perceptible distortion of a color image based on a DCT field, which comprises the following steps: transforming a selected color image to Lab color space from RGB color space, respectively carrying out 8*8 DCT transformation of the three components L, a and b under the Lab color space, and transforming the three components L, a and b to the DCT field from a spatial field; computing according to the product of a luminance basic threshold value and a modulation factor to acquire a JND value of the perceptible distortion of a luminance component L in the DCT field; and computing according to the product of a chromaticity basic threshold value and the modulation factor to acquire the JND value of the perceptible distortion of the chromaticity components a and b in the DCT field. The method for computing the perceptible distortion of the color image has a lower peak signal-to-noise ratio (PSNR) on the whole and can tolerate more objective distortion.
Description
technical field [0001] The invention relates to the technical field of video image communication, in particular to a method for calculating perceivable distortion degree of color images based on DCT domain. Background technique [0002] The traditional compression coding method is mainly based on the mean square error (MSE) as the criterion. This method has clear physical meaning and simple calculation, and has become the most widely used evaluation criterion in compression coding methods. However, MSE only considers the data distortion of the signal and cannot A good reflection of the local image and the visual characteristics of the human eye, the result is often inconsistent with the subjective visual effect of the human eye. Since the human eye is the ultimate receiver of images and video signals, it is hoped that the subjective visual effects of the human eye will be taken into account during compression coding. [0003] Under the action of certain physiological and ps...
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Inventor 胡瑞敏陈皓胡金晖毛丹王师峥汪欢张岿钟睿
Owner WUHAN UNIV