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All printed documents and credentials are potentially subject to counterfeiting and forgery. Conventional counterfeiting solutions such as watermarking or printing with special-quality paper are not cost-effective. Certification via authorized chops/ stamps is low-cost but only provides a false sense of security/ authenticity. While embedding a serial(More)
Color brings extra data capacity for QR codes, but it also brings tremendous challenges to the decoding because of color interference and illumination variation, especially for high-density QR codes. In this paper, we put forth a framework for high-capacity QR codes, HiQ, which optimizes the decoding algorithm for high-density QR codes to achieve robust and(More)
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