Abstract

To get the most clear security image for optimal security, the relationship of grayscale between the digital grating and host image was studied using the optical properties of the transmission grating. In this anticounterfeiting technology, the correspondence between the digital grating and the host image was analyzed. The same security patterns were embedded into eight host images of different tones. The clarity of the extracted security information was evaluated to determine the best relationship of grayscale between digital grating and host image. Studies have shown that the security of a bright tone image is better. When the grayscale of the host image is 40%, the anticounterfeiting effectiveness is the best; when the grayscale is more than 60%, this anticounterfeiting technology no longer applies. At the same time, the corresponding curves of the grayscale between the digital grating and the host image with common screen size were provided and the mathematical model for expressing their correlation was established.

© 2014 Optical Society of America

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