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A technique for watermarking duplex printed pages is presented. The technique produces visible watermark patterns like conventional watermarks embedded in paper fabric. Watermark information is embedded in halftones used to print images on either side. The watermark pattern is imperceptible when images printed on either side are viewed independently but becomes visible when the sheet of paper is held up against a light. The technique employs clustered dot halftones and embeds the watermarkdoi:10.1117/12.525550 dblp:conf/sswmc/SharmaW04 fatcat:rx6e23cosrhdhf6x7zuccaykra