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JND (Just Noticeable Difference) value measurement method of image brightness

A technology of image brightness and measurement method, which is applied in image communication, testing optical performance, TV, etc., and can solve the problem that the parameters related to display brightness cannot quantitatively evaluate the impact of image display quality, etc.

Inactive Publication Date: 2013-09-25
HOHAI UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the inability to quantitatively evaluate the impact on image display quality when improving display brightness related parameters, and provide a JND value measurement method for image brightness, which can quantitatively evaluate the effect of human eyes when improving display parameters. Perceivable impact on image brightness, thus providing a basis for the design and research of display technology

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  • JND (Just Noticeable Difference) value measurement method of image brightness
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  • JND (Just Noticeable Difference) value measurement method of image brightness

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Embodiment Construction

[0022] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0023] The JND value measuring method of image brightness of the present invention comprises the following steps:

[0024] Step A, process the original image according to the following method to obtain the test image:

[0025] Step A1, converting the original image to a linear space through gamma correction; in this specific embodiment, γ=2.2;

[0026] Step A2, then convert the original image from RGB space to xyY space through XYZ space;

[0027] The conversion formula from RGB space to XYZ space is as follows:

[0028] (1)

[0029] in,

[0030]

[0031] (Xr, Yr, Zr), (Xg, Yg, Zg) and (Xb, Yb, Zb) are the coordinates of the three primary colors of red, green and blue in the XYZ space, and (Xw, Yw, Zw) are the white field point in the XYZ space coordinate of;

[0032] Transform from XYZ space to xyY space, where the Y co...

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Abstract

The invention discloses a JND (Just Noticeable Difference) value measurement method of image brightness, which comprises the following steps of: converting an original image into an xyY space, respectively carrying out linear compression to a component Y according to different compression coefficients to obtain a group of test images; carrying out visual perception experiment, and finding at least one test pattern to be as a JND critical image; dividing the original image and the JND critical image into a plurality of image blocks, respectively selecting the image blocks with the largest average gray level in the original image and the JND critical image; computing the difference of the accrual display brightness corresponding to the average gray level value of the image blocks with the largest average gray level in the original image and the JND critical image, wherein the average value of the difference is the JND value of a participant to be tested to the original image brightness; and carrying out average computing to the brightness JND values of the different original images of different participants to determine a final JND value. According to the invention, when the parameter of the display is changed, the influence to the image brightness, which can be observed by the human eyes, can be quantitatively evaluated and improved, thus, evidences can be provided for the design and the research of display technology.

Description

technical field [0001] The present invention relates to a method for measuring image brightness, in particular to a method for measuring a JND (Just Noticeable Difference: just noticeable difference) value of image brightness. 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 rec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N17/00G01M11/02
Inventor 秦少玲曹宁
Owner HOHAI UNIV
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