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Image quality evaluation method based on visual characteristic

A technology for image quality evaluation and visual characteristics, applied in image analysis, image data processing, instruments, etc., can solve problems such as the inability to quantitatively evaluate the impact of image display quality, and achieve the effect of high practical application value

Inactive Publication Date: 2012-08-08
HOHAI UNIV
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art that cannot quantitatively evaluate the impact on image display quality when improving related parameters such as display brightness and chromaticity, and provide an image quality evaluation method based on visual characteristics, which can Quantitatively evaluate the impact on the display image quality that the human eye can perceive when improving the display parameters, so as to provide a basis for the design and research of display technology

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  • Image quality evaluation method based on visual characteristic

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Embodiment Construction

[0050] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0051] The image quality evaluation method based on visual characteristics of the present invention specifically follows the steps below:

[0052] Step A, measure the JND value of image brightness according to the following method:

[0053] Step A1, process the original image according to the following method to obtain the test image:

[0054] Step A101, converting the original image into a linear space through gamma correction; in this specific embodiment, γ=2.2;

[0055] Step A102, then converting the linearly converted original image from RGB space to xyY space through XYZ space;

[0056] Step A103. In the xyY space, keep other components unchanged, and only compress the component Y according to a group of different

[0057] The coefficients are respectively linearly compressed, and the set of compression coefficients are distributed at equal inte...

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Abstract

The invention discloses an image quality evaluation method based on a visual characteristic. The method is characterized by: firstly, converting original images into a xyY space or a LCH space, processing a component Y or a component C so as to obtain a group of test images; then, finding at least one JND (just noticeable difference) critical image; calculating differences of brightness (BR), color saturation (CS) and Gaussian function variance parameters in the original images and the JND critical image, wherein average values of the differences are the JND values of the BR, CS and contour rendering (CR) of the original images respectively; and then, carrying out mean calculation on the JND values of the different original images and determining the final JND values; taking the JND as a unit to change different attributes of the image at different degrees respectively; using a visual perception test to test the subjective image quality; then, using a regression analysis to establish a relation model of the image quality and the image attributes; and researching influences of the different attributes of the images according to a variance analysis. By using the method of the invention, influence on image quality which can be perceived by human eyes when improving the display parameter can be quantitatively evaluated.

Description

technical field [0001] The invention relates to an image quality evaluation method, in particular to an image quality evaluation method based on visual characteristics. Background technique [0002] Display technology can not only realize accurate, intuitive, clear and fast information output, but also provide a friendly interface for man and machine to exchange information for the information age. Market research shows that display image quality is one of the most important determinants for end users to purchase electronic display devices. Therefore, the evaluation of information display quality is an important content in the field of display technology. Since all displayed information is observed by the observer through human eyes, people's judgments on image quality are different for different environments and uses. Therefore, the human factor must be considered in the evaluation of display image quality. In recent years, with the rapid increase in the number and diver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
Inventor 秦少玲曹宁
Owner HOHAI UNIV
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