The most significant bit- (MSB-) plane of an image is least likely to change by the most signal processing operations. This paper\r\npresents a novelmultibit logo-based signature, using the most significant gray-scale bits, which is then used to develop an extremely\r\nsimple but robust copyright protection scheme, where images along with their signatures are sent to a trusted third party when a\r\ndispute arises. Different ways of processing the MSB-plane before calculating the robust signature have been developed. This paper\r\nthen presents an innovative classifier-based technique to test the robustness and uniqueness of any signature-based scheme. A new\r\nMSB-based attack, which would defeat our scheme most, has also been proposed. Experimental results have clearly demonstrated\r\nthe superiority of the proposed scheme showing the high robustness of different MSB-based signatures over the existing signaturebased\r\nschemes.
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