Grating-based rainbow hologram chromaticity detection and evaluation method

Abstract

The invention provides a grating-based rainbow hologram chromaticity detection and evaluation method, which mainly comprises the following steps of: determining the type and optical parameters of a diffraction grating, and selecting an optical filter according to the type characteristics of the grating; preserving or shielding specular reflection light according to actual needs by adopting a diffused light source; and testing the reflectance spectrums of a sample, calculating spectral errors and metamerism indexes of a reference and the sample according to the reflectance spectrums of the tested sample, and evaluating the chromaticity information of a grating-based rainbow hologram image according to the spectral errors and the metamerism indexes. The method has the advantages of objectively reflecting the chromaticity information between the sample and the reference and accurately reflecting chromaticity errors between the sample and the reference, along with simplicity and high speed, and is popularized and utilized to effectively control the chromaticity quality of the grating-based rainbow hologram image and promote laser holographic anti-counterfeiting, three-dimensional printing and control over the quality of grating-based high-end products.

Description

Technical field [0001] The invention belongs to the field of image chromaticity quality detection and evaluation, and specifically relates to a grating-based rainbow hologram that uses special light source illumination conditions and calculates the chromaticity information of a grating-based image through spectrum, thereby evaluating the quality of the grating-based image Image chromaticity detection and evaluation method. Background technique [0002] In the increasingly competitive consumer goods market, when consumers buy goods, in addition to paying attention to the quality and performance of the goods, they also have higher and higher requirements for the packaging and decoration of the goods. The raster-based rainbow holographic printing material has a clear and bright effect after printing, as well as the overall anti-counterfeiting function of the rainbow image that cannot be covered after printing, which makes the packaged product appear noble and gorgeous, thereby impro...

AI Technical Summary

Problems solved by technology

Although this method realizes the evaluation of the surface color of laser paper to a certain extent, it fails to explain the regularity of the color of laser paper fundamentally, and the error of color repeat detection is large, and the stability of color detection is poor, which is different from the actual production. There is still a long way to go before it can be widely used in

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