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Abstract: Computers can not determine the exact size of the edge simply according to a bitmap image of the brick-carved to be processed, making it difficult to set up a three-dimensional digital model. To solve this problem, we proposed to process manual diagrams, the traditional processing materials of carved bricks, through adaptive median filtering, image sharpening, Canny edge operator, gray-scale image processing and other computer technologies. Simulation experiments of CNC engraving showed that three-dimensional model established by gray-scale image information could be effectively applied to CNC engraving. [Copyright &y& Elsevier]