Method for correcting digital tongue picture colour cast

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...

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