Method for generating a gray-scale pattern

Details Method for generating a gray-scale pattern Method for generating a gray-scale pattern

1991-07-23

1993-04-13

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 18, 382 47, 382 51, G06K 936

Patent

active

052029360

ABSTRACT:
A method for generating a low-resolution gray-scale pattern representing a high-resolution original character image. A sampling pattern is generated having plural sampling windows arranged in columns and rows, the number of columns and rows being determined by the resolution of the gray-scale pattern. The sampling pattern is sequentially positioned at plural positions separated by a predetermined distance along a column direction and a row direction on the original character image to count, at each position, the total number of black pels in predetermined portions of the rows of the sampling pattern and the total number of black pels in predetermined portions of the columns of the sampling pattern. The total number of black pels counted at each of the positions is compared to detect a position at which the largest total number of black pels in the column is detected and at which the largest total number of black pels in the row portions is detected. The sampling window is positioned at the detected position on the original character image, and the number of black pels in each sampling window of the sampling pattern is counted to assign a gray-scale value to the sampling window. Characters such as kanji characters consisting primarily of horizontal and vertical strokes are further processed by shifting selected rows and columns to match the sampling pattern.

REFERENCES:
patent: 4490851 (1984-12-01), Gerhart et al.
patent: 4688088 (1987-08-01), Hamazaki et al.
patent: 4829587 (1989-05-01), Glazer et al.

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