Method for correcting digital tongue picture colour cast

A correction method and tongue image technology are applied in the field of digital correction of tongue image color deviation, which can solve problems such as overall color deviation.

Inactive Publication Date: 2007-04-11
TSINGHUA UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Although the strong light of the flash can shield the interference of natural light in the tongue image taken with the forced flash mode of a digital camera, the strong light of the flash illuminates the surface of the tongue, which will make the overall color of the tongue image deviate, and the whole tongue image tends to be warm red and yellow. hue, so it is necessary to correct this deviation by a certain method

Method used

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  • Method for correcting digital tongue picture colour cast
  • Method for correcting digital tongue picture colour cast
  • Method for correcting digital tongue picture colour cast

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Embodiment Construction

[0096] The method hardware consists of a digital camera and a computer. The software for adjusting the algorithm is realized by Matlab. The imported tongue photo is taken by a doctor of traditional Chinese medicine with a digital camera. When taking the photo, the patient sticks out his tongue, which is convenient for the doctor to take the whole tongue into the photo.

[0097] The Macbeth color card consists of 24 color blocks, distributed in four rows and six columns, arranged in order from left to right and from top to bottom, as shown in Figure 2. in turn denoted as M j =[MR j , MG j , MB j ], j=1~24, the sequence diagram is shown in Figure 3. Among them, MR j , MG j , MB j Respectively represent the values ​​of the red, green and blue channels in the jth color block, and the standard values ​​of the 24 color blocks of the card are listed in the attached instructions, as shown in Figure 4.

[0098] Use Sony Cybershot DSC-W1 digital camera to take pictures indoors,...

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Abstract

This invention relates to a digital correction method of tongue color deflection, the feature is as the following steps: making white equation emendation on the image of Macbeth color adjusting calibration card from flash lamp and switching to the tonality, saturation, lightness space to get the corresponding adjustment parameters by cooperation with the standard value of color card. Then shoot the tongue picture by digital camera, and make white equation emendation switching to the tonality, saturation, lightness space, which is then adjusted by using the above parameter and returned into the red, green and blue spaces. Finally, use gamma value to adjust the pictures of red, green and blue spaces. The gamma value of curve emendation is combined by the least double multiplication with the light value of Macbeth card standard and the average value of picture light.

Description

technical field [0001] The invention belongs to the category of digital correction method for tongue image color shift. Background technique [0002] Since the mid-to-late 1980s, Chinese medicine practitioners and digital imaging practitioners began to combine to try to conduct objective research on tongue diagnosis based on computer technology. The research mainly focuses on the color calibration, storage and output of tongue photos, and the processing of tongue photos with modern image processing and analysis techniques. Among them, the color of the tongue is the most important information in tongue diagnosis. Although the strong light of the flash can shield the interference of natural light in the tongue image taken with the forced flash mode of a digital camera, the strong light of the flash illuminates the surface of the tongue, which will make the overall color of the tongue image deviate, and the whole tongue image tends to be warm red and yellow. Hue, so it is nec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00H04N1/60A61B5/00
Inventor 白净张永红吴佳崔珊珊孙晓静
Owner TSINGHUA UNIV
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