Method for computing perceptible distortion of color image based on DCT field
A technology of color image and calculation method, which is applied in the direction of image communication, television, electrical components, etc., and can solve the problem that the calculation accuracy needs to be further improved.
Inactive Publication Date: 2011-01-26
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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[0057] The present invention will be further described below with specific embodiments in combination with the drawings:
[0058] The method for calculating the perceptible distortion degree of color image based on DCT domain provided by the present invention adopts the following technical solutions, see figure 1 The flow chart shown includes the following steps:
[0059] Step S1: Convert the selected color image from RGB color space to Lab color space;
[0060] 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;
[0061] Step S3: In the DCT domain, the perceptible distortion JND value of the luminance component L is calculated according to the product of the basic luminance threshold and the modulation factor;
[0062] Step S4: In the DCT domain, the perceptible distortion JND values of the chrominance components a and b are calculated according to the product of the basi...
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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 present invention relates to the technical field of video image communication, and in particular to a method for calculating perceptible distortion of color images based on the 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 extensive evaluation criterion in the compression coding method. However, MSE only considers the data distortion of the signal and cannot be very It reflects the visual characteristics of the part of the image and the human eye, and 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 should be taken into consideration during compression coding. [0003] Under certain physiological ...
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IPC IPC(8): H04N17/00
Inventor 胡瑞敏陈皓胡金晖毛丹王师峥汪欢张岿钟睿
Owner WUHAN UNIV