The edge is the most important information in the image, and is an important basis for pattern recognition, image segmentation and scene analysis. Edge detection is an important field of image processing technologies and tasks. Edge in the image is usually interpreted as grayscale values ​ ​ sudden changes in pixel gradient local maxima. Many classic edge detection operators such as: Roberts, Sobel, Prewitt, Frei-Chen and Laplacian, etc., are the image of local regional characteristics specific edge pattern matching based on the definition of a number of directional derivative template (usually a window), the image convolution operation of edge detection with a template. They have a simple, fast speed, easy to apply. When the template direction and the edge direction matches, can achieve very efficient edge detection result.

waveletanalysis.caj

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