![]() To cope with small geometric attacks, a replica of the watermark is embedded by dividing the image into sub-blocks and taking the DCT of these blocks. Since the coefficients are selected at random, the powers of the low magnitude coefficients are increased to enhance their immunity against image attacks. ![]() ![]() The original phases of the selected coefficients are removed and the new phases are set in accordance with the embedded watermark. A key is used to randomly select a group of coefficients from that subset for watermark embedding. The technique embeds the watermark in a subset of low to mid frequency coefficients. We present a new oblivious digital watermarking technique for copyright protection of still images. A digital watermark is a short sequence of information containing an owner identity or copyright information embedded in a way that is difficult to erase.
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