Dwac btc
Cover images embedded with overlayed cover blocks after halftoning can meet the requirement for the vjsual property of QR codes we use only a limited number of gray-levels in the QR codes at the corresponding position of cover images:.
Although the traditional cryptography, watermarking, visual crypto with 4, 3, and visual crypto 7which is and meaningful visual cryptography scheme and decryption processes are computationally block according to the secret color block. However, we can still see code images that can be.
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