Robust Signature-Based Copyright Protection Scheme Using the Most Significant Gray-Scale Bits of the Image

Figure 3

Original images (a) Lena and (b) Elaine with their ROIs used; original logos (c) Monash and (d) NUS; mapped logos by TROI-based scheme [12] (e) Monash (15.19 dB, 53%) and (f) NUS (17.47 dB, 55%); and coded logos by VQ-based scheme [13] (g) Monash (23.40 dB, 64%) and (h) NUS (25.35 dB, 66%). Note that all images (512×512) and logos (64×64) are 8-bit gray-scale. Request granted to use logos for research purposes only.

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