Secret image sharing

By Chih-Ching Thien, Ja-Chen Lin. Computers & graphics, 2002

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Selective scalable secret image sharing with verification (2015, background): “Nevertheless, neither [10] nor [6] can provide a meaningful shadow image.”
Improvements of image sharing with steganography and authentication (2007, methodology): “For further reducing the size of noise-like shadow images, Thien and Lin (2002) embedded the secret pixels in all the coefficients of the (k À 1)-degree polynomials to encrypt the secret image into shadow images with size 1/k times that of the original image.”