Summary of image edge detection

Edge is one of the most fundamental and significant features. Edge detection is always one of the most classical studying projects of computer vision and image processing field. The fist step of image analysis and understanding is edge detection. The goal of edge detection is to recover information about shapes and reflectance or transmittance in an image. It is one of the fundamental steps in image processing, mage analysis, image patter recognition, and computer vision, as well as in human vision. The correctness and reliability of its results affect directly the comprehension machine system made for objective world. The summary for basic edge detection methods was made. It involved the detection methods only but not filtering, edge location, analysis of algorithm complexity and functional evaluation about a detector.