Different color patterns of quick response (QR) codes, suchas RGB, grayscale, and binaryQR codes, are widely used in applications.\nIn this paper, we propose a novel XOR-based visual secret sharing (VSS) scheme using grayscale QR codes as cover images and\nbinary QR code as secret image. First, all the codewords of the secret QR code image are encoded into n temporary binary QR code\nimages, which are substituted for the second significant bit planes of the grayscale QR code cover images to generate n shares. Each\nshare is a grayscale QR code image, which can be decoded by a standard QR code decoder, so that it may not attract the attention\nof potential attackers when distributed in the public channel.The secret image can be recovered by XORing the codewords regions\nof QR codes which are extracted from the second significant bit planes of the grayscale shares. More importantly, the proposed\nscheme is robust to JPEG compression, addition of different noises, rotation, resizing, and cropping, which is useful in practice.\nThe effectiveness and robustness of our scheme are shown by the experimental results. The application of QR code is suitable for\nwireless multimedia data security.
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