Skin color evaluating method of certificate digital photo
An evaluation method and technology of skin color, which is applied in the field of skin color evaluation of certificate digital photos, can solve the problems of affecting the accuracy of skin color detection and misjudgment of skin color detection
Active Publication Date: 2014-04-30
SHANDONG SYNTHESIS ELECTRONICS TECH
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Problems solved by technology
[0013] First, the area of the test area is much smaller than the facial area of the portrait, so the statistical data does not represent the situation of the entire face, and there are cases of misjudgment
[0014] Second, when the distance between the eye level and the bottom of the photo exceeds 230, the selected area may include the nose and mouth. Due to the influence of shadow and lip color, it will cause misjudgment of skin color detection
[0015] Third, the hair of some women may fall in this area, which will affect the accuracy of skin color detection
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[0096] Convention: (1) The image m is a matrix, W(m) and H(m) are the number of columns and rows of the image m, and are called the width and height of the image respectively; (x, y) represents the first The coordinates of the element p in column x and row y, the counting of x and y starts from 0, 0≤x≤W(m)-1, 0≤y≤H(m)-1; (2) C(m, x , y) represents the color of image m at pixel (x, y), C(m, p) represents the color of pixel p in image m; (3) K(m) is the color of all pixels in the skin color area of returned image m collection; (4) Indicates the number of elements in the set S, Called the potential of the set S; (5) is the average color function, which returns the average color of image m in area a; (6) function for color and The distance function between, which satisfies , and Constraint conditions; (7) A is the complete set of ideal images, representing the collection of all portrait images that meet the requirements of ID photos in theory; z is the image ...
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The invention relates to a skin color evaluating method of a certificate digital photo. The method includes a. building a sample collection; b. calculating a sample skin color area function K(m); c. calculating a skin color sampling area E; d. calculating a skin color area pixel collection function k (m); f. calculating average color of a sample image S and an area Z to be measured; g. building a color distance calculating formula; j. judging color cast degree of the image to be measured; k. judging contrast degree of an image z; and m. judging image brightness. The method includes first building the sample image S composed of manual modulation pictures, manually calculating various parameters of skin color area characteristics and superficial skin color characteristics of the S, then calculating a skin color area and various parameters of the image z to be measured, finally comparing the figure image to be measured with sample color, brightness and contrast to obtain an evaluating result of the figure image to be measured. Operators can conveniently modify the photo or recollect pictures to conveniently print figure pictures meeting certificate requirements on different printing devices.
Description
technical field [0001] The present invention relates to a method for evaluating the skin color of a certificate digital photo, more specifically, to a method for evaluating the color, brightness and deviation of an image to be tested. Background technique [0002] Due to the color gamut characteristics of the printing equipment, the skin color of the portrait in the ID photo must match the printing equipment in order to have a better printing effect. Therefore, it is necessary to perform necessary inspections on the portrait photos output by the ID photo portrait collection system to ensure that the printing requirements are met. [0003] At present, there is no determination of whether the skin color of the photo matches the exact standard of the printing equipment. In order to check whether the color of the portrait photo is qualified, usually a number of photos that meet the printing requirements are manually produced first, and these are used as learning samples, and the...
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IPC IPC(8): G06K9/00G06T7/40
Inventor 许野平
Owner SHANDONG SYNTHESIS ELECTRONICS TECH