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A method for establishing a suprathreshold psychological scale of image brightness jnd

A technology of image brightness and psychological scale, applied in image communication, TV, electrical components, etc., can solve the problem of not being able to confirm the amount of change in psychological perception, and achieve the effect of improving the ability to adjust technical parameters

Inactive Publication Date: 2017-05-24
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the problem faced by this method is: when changing the brightness of the image to a multiple of a JND variation, it is impossible to confirm that the amount of change it feels psychologically is the corresponding multiple of changing the brightness of the image by 1 JND variation

Method used

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  • A method for establishing a suprathreshold psychological scale of image brightness jnd
  • A method for establishing a suprathreshold psychological scale of image brightness jnd
  • A method for establishing a suprathreshold psychological scale of image brightness jnd

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Embodiment Construction

[0034] Below in conjunction with accompanying drawing of description, the present invention will be further described.

[0035] The invention provides a method for establishing a suprathreshold psychological scale of image brightness JND, comprising the following steps:

[0036] Step A, process the original image according to the following method to obtain the test image;

[0037] Step A1, converting the original image into a linear space through gamma correction; in this specific embodiment, γ=2.2 is adopted, and γ is the physical property parameter of the display;

[0038] Step A2, then convert the linearly converted original image processed through step A1 from RGB space to xyY space through XYZ space;

[0039] The conversion of RGB space to XYZ space is a prior art, and its conversion formula is as follows (1),

[0040] [X Y Z]=[R G B][M] (1)

[0041] in,

[0042]

[0043] x r =x r / y r Y r = 1 Z r =(1-x r -y r ) / y r

[0044] x g =x g / y gY g = 1 Z g ...

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Abstract

The invention discloses a supraliminal psychological scale building method for image brightness JND, and the method comprises the steps: firstly enabling an original image to be converted to an xyY space, respectively carrying out linear compression of a component Y according to different compression coefficients, and obtaining a group of test images, wherein the selection range of the compression coefficients is corresponding to the change range of image brightness from zero to 2R; secondly carrying out a visual perception test, finding one test image, considering that the brightness change of the image is between the brightness change of the original image and the brightness change of the center of the test image with the biggest change range, and taking the multiple of the corresponding brightness change of the image and the JND change as a subjective mid-value; thirdly carrying out the repeated testing of different image contents and the change range of the test images, and recording the tested subjective mid-value; finally carrying out the statistics of the mean value of the subjective mid-values and 95% confidence intervals, taking the subjective mid-values as the basis, and building the supraliminal psychological scale of image brightness. The method can quantitatively evaluate the impact, which can be seen by human eyes, on the image brightness during the parameter design of improving the brightness and contrast of a display.

Description

technical field [0001] The invention relates to a method for measuring image brightness, in particular to a method for establishing a suprathreshold psychological scale of image brightness JND, which belongs to the technical field of image display. Background technique [0002] In the information age, display technology provides a friendly way of human-computer interaction. Market research shows that display image quality is one of the important determinants for end users to purchase display devices. However, new technologies and new applications may change observers' evaluation of display image quality. To this end, Engeldrum introduced the "image quality loop" model, which links the image display quality that consumers care about with the technical parameters of the display system through some intermediate steps. Consumers' subjective perception of image quality is the weighted sum of the observed image quality attributes. These image quality attributes include sharpnes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N17/00
CPCH04N17/00
Inventor 秦少玲
Owner HOHAI UNIV