Perceptionbased Reversible Watermarking for 2DVector Maps This paper presents an effective and reversible watermarking approach for digital copyright protection of 2Dvector maps. To ensure that the embedded watermark is insensitive for human perception, we only select the noise nonsensitive regions for watermark embedding by estimating vertex density within each polyline. To ensure the exact recovery of original 2Dvector map after watermark extraction, we introduce a new reversible watermarking scheme based on reversible highfrequency wavelet coefficients modification. Within the formerselected nonsensitive regions, our watermarking operates on the lowerorder vertex coordinate decimals with integer wavelet transform. Such operation further reduces the visual distortion caused by watermark embedding. We have validated the effectiveness of our scheme on our realworld city riverbuilding 2Dvector maps. We give extensive experimental comparisons with stateoftheart methods, including embedding capability, invisibility, and robustness over watermark attacking.

Perceptiondriven Watermarking with Evolutionary Block Mapping This paper presents a perceptiondriven, blockbased wavelet watermarking algorithm, which merits in both perceptual invisibility and robustness against watermark attacking. First, attentionbased region saliency analysis is adopted to select perceptually unconcerned regions for watermark embedding. Second, wavelet transform is carried out to embed secret message into high frequency coefficients within the perceptually unconcerned regions. Especially, we present an optimal block mapping substitution method, which adopts genetic algorithm to reduce PSNR cost. Its main idea is to minimize the degradation of the watermarked image by learning a best mapping function between original image blocks and secret messages at global scope. Extensive experiments are conducted to validate both the perceptual invisibility and robustness against Gaussian Noise and JPEG compression attacks. We also give PSNR comparison with stateoftheart methods to demonstrate our advantages.