An ICA-Based Polygonal Curves Watermarking Algorithm

An ICA-based polygonal curve watermarking algorithm is proposed.The algorithm consists of the following parts:Firstly,the contour points of polygonal curves are extracted by an edge tracking technique,then an affine-invariant descriptor is computed from the extracted contour points by the ICA.Secondly,the watermark,which is orthogonal to the descriptor,is generated and embedded into the descriptor.Finally,the watermarked contour is recovered by applying the inverse process.The proposed algorithm is experimental shown robust enough to common image processing operations,especially to affine operations.