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We propose a novel semi-fragile multiple-watermarking algorithm based on quantization index modulation. This algorithm utilizes two quantization steps to yield the non-uniform intervals in the real-number axis. Each interval corresponds to one binary symbol, includes stable-zero (S 0 ), unstable-zero (U 0 ), stable-one (S 1 ), and unstable-one (U 1 ). In addition, visual cryptography is integrated with the watermarking algorithm to increase the watermark capacity. Therefore, the host image isdoi:10.1145/1128817.1128843 dblp:conf/ccs/PeiZ06 fatcat:ukn4jqyhwrfldfvokcoq3g4uzq