METHOD FOR PROCESSING LINE DRAWING AND RECORDING MEDIUM WHERE LINE DRAWING PROCESSING PROGRAM IS RECORDED

摘要

PROBLEM TO BE SOLVED: To improve picture quality without spoiling the shape of linearity and to improve the certainty of character recognition by averaging images by using the directivity of a line part area extracted by using a local feature difference. SOLUTION: A line drawing detecting process part 13 makes a square numeral array operate as an image filter on image data 2 including a line drawing and detect the line drawing while making pixels in the area of the square numeral array and pixels of the image of the filter area part of the image data 2 including the line drawing correspond to each other. Denoting the number of line drawing extraction filters as N and the numbers of the filters as n (n=1 to N), the density mean An or density standard deviation Bn of a pixel group corresponding to an area of a numeral '1' is calculated as to all line drawing extraction filters (n) for object pixels of the image data 2 and the density mean Cn or density standard deviation Dn of the pixel group of the whole filter area is calculated (S1, 2). The ratio An/Cn or Bn/Dn is calculated and used to determine an image feature direction and an image direction index (S3, 4).