| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an image processing apparatus capable of excellently extracting pixels configuring edges of characters or line drawings independently of a direction of the edges configured by the edge pixels. <P>SOLUTION: A first filter arithmetic section 1 applies convolution between a series of image data of each pixel configuring a matrix of 5 pixels × 5 lines and a series of coefficients of a first Laplacian filter. Further, a second filter arithmetic section 2 applies convolution between the series of image data of each pixel configuring the matrix of 5 pixels × 5 lines and a series of coefficients of a second Laplacian filter. An edge discrimination section 3 respectively compares the an arithmetic value SS1 by the first filter arithmetic section 1 with a predetermined threshold value TH and an arithmetic value SS2 by the second filter arithmetic section 2 with the predetermined threshold value TH and discriminates that a pixel in a central position (target pixel) of the matrix of 5 pixels × 5 lines is an edge pixel when at least either of the arithmetic values SS1, SS2 is greater than the threshold value TH. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
