Image processing method and system for simulating pencil sketch

The invention discloses an image processing method and system for simulating a pencil sketch. The method includes the followings steps that: histogram statistics is performed on the grey-scale image of an image to be processed, and histogram matching is performed according to the result of the histogram statistics, so that a histogram mapping table can be obtained; mapping processing is performed on the grey-scale image according to the histogram mapping table, so that a ground color image can be obtained; edge detection is performed on the grey-scale image, so that an edge image can be obtained; radial fuzzy processing at eight directions is performed on the edge image, so that obtained radial fuzzy images at the eight directions are subjected to superposition processing, so that a line image can be obtained; multiplication processing is performed on the ground color image and the line image, so that a pencil sketch rendering can be obtained. With the image processing method and system for simulating the pencil sketch, the verisimilitude of the pencil sketch rendering can be improved.