Some general suggestions are involved to outline the implementation of usefull algorithms for edge detection and controur segmentation in the practical vision systems. The model-based approach of analysis is compared against general passive methods of contour extraction and shape recognition. The new approach, proposed in this paper is based ...

A new method for image watermarking is offered, based on 3-level 'verse difference pyramid decomposition ()DP) with 2D complex Hadamard :ansform (20-CHT). The method permits the watermarks, inserted in the Tisecutive pyramid layers, to be practically invisible and inerasable, and together ch this ensures high resistance against tampering, ...