Optical EngineeringVisual secret sharing scheme: prioritizing the secret pixels with different pixel expansions to enhance the image contrast
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A visual secret sharing (VSS) scheme is a secret image sharing scheme that divides a secret pixel into several subpixels (the number of subpixels is called the pixel expansion). The secret image encrypted by the VSS technique can be visually revealed without additional computations. However, the contrast of recovered image is poor and thus the VSS framework is always a research issue and does not have practical applications. We introduce a new framework that prioritizes the pixels with different pixel expansions to enhance the image contrast for practical use. Also, by integrating the optical character recognition with the proposed VSS scheme we show a new visual authentication scheme.