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Date Posted:
Monday October 16, 2006 10:05:31 AM
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Computer scientists Samir Kumar Bandyopadhyay (University of Calcutta), Debnath Bhattacharyya (Heritage Institute of Technology) and Anindya Jvoti Pal (Heritage Institute of Technology) examine digital watermarking, the process that embeds data called a watermark into an object such that the watermark can be detected and extracted later to make an assertion about the object. Watermarking is either ²visible² or ²invisible². Although visible and invisible are visual terms watermarking is not limited to images, it can also be used to protect other types of multimedia objects. The research work of these authors is on watermarking techniques in particular, and they note that many of the proposed techniques share three specific weaknesses:
complexity of copy detection, vulnerability to mark removal after revelation for ownership verification, and mark integrity issues due to partial mark removal. Their paper for Ubiquity presents a method for watermarking Handwritten Signature that achieves robustness by responding to these three weaknesses. They say the key techniques involve using secure functions to generate and embed image marks that is more detectable, verifiable, and secure than existing protection and detection techniques.
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