JPS5668876A - Feature extraction processing system - Google Patents

Abstract

PURPOSE: To discriminate the character pattern with a complicated structure, by classifying the intersection frequency M of the scanning line and the character part into two on the basis of N displaying the level element of each white point binary, and by increasing this base N in steps as required to form a primary phase feature.

CONSTITUTION: Scanning part 20 scans the paper surface according to the instruction of control part 60, and binary signals for regions including one character on the form are stored successively in prescribed addresses of multilevel Loci pattern memory 71 of intersection frequency counting circuit 70 with one word at one point. Further, memory 71 is raster-scanned by circuit 70 and the frequency of intersection between white points of memory 71 and character parts is stored. Next, coder 90 reads contents of memory 71 successively according to the instruction of control part 60, and code 1 and 0 are set for frequency M of intersection in each direction M≥N and M<N respectively on a basis of intersection frequency threshold N set in intersection frequency threshold control part 80, and the binary coded pattern in each direction is transmitted to pattern memory 30, thus discriminating the character pattern in discriminating part 50.

COPYRIGHT: (C)1981,JPO&Japio