Non-contact type color detecting method based on digital image technology

Abstract

The invention discloses a non-contact type color detecting method based on a digital image technology. The non-contact type color detecting method comprises the following steps: collecting image color data of a standard color card under a standard light source in a color matching observation box through a digital camera, and obtaining a conversion relation between the image color data and the standard color card by combining with an XYZ spectrum tristimulus value of the standard color card; measuring image color data of a standard sample and a batch sample under the standard light source in the color matching observation box by using the digital camera, computing XYZ spectrum tristimulus values of the standard sample and the batch sample through the conversion relation obtained by the standard color card, computing related chromatic aberration based on the XYZ spectrum tristimulus values of the standard sample and the batch sample, and judging whether the color meets the requirement or not according to the requirement on quality of a detected article. According to the non-contact type color detecting method based on the digital image technology, disclosed by the invention, the artificial influence factors of visual inspection are removed, and compared with a visual inspection mode, the accuracy of a testing result is higher and more reliable; the color of a colorful picture, a curved surface or the surface of an article which is uneven and is mixed in colors and nonuniform or irregular in coloring can be measured, and the using range is wider.

Description

technical field [0001] The invention relates to a detection method, in particular to a non-contact color detection method based on digital image technology. Background technique [0002] In daily industrial and agricultural production practice, it is often necessary to evaluate and control the quality of the reproduction and reproduction of the appearance of the tested object. Currently, the commonly used technical means are visual observation with the naked eye or measurement with color measuring instruments. Visual observation with the naked eye is to place the standard sample and the batch sample in the standard light source color observation box, and trained skilled technicians will compare the difference with the naked eye, and make a judgment on whether it meets the requirements. Colorimetric instrument measurement is to use the instrument to obtain the respective colorimetric parameters of the standard sample and the batch sample, calculate the color difference betwee...

AI Technical Summary

Problems solved by technology

[0004] Although the measurement method of color measuring instruments can minimize the influence of human factors and give reliable, objective and repeatable measurement and identification results, traditional color measuring instruments cannot measure color images, curved surfaces, etc. due to the limitations of the principle and structure of the instrument itself. or bumpy, mixed, unevenly colored, or irregularly colored surfaces

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