Image analysis – Histogram processing – For setting a threshold
Patent
1993-07-07
1996-07-16
Evans, Arthur G.
Image analysis
Histogram processing
For setting a threshold
382254, G06K 1500
Patent
active
055375154
ABSTRACT:
Bit map data stored in an image memory is read every one column by N lines or M columns by one line and is stored in a shift register of M bits by N bits. The data in the shift register is differentiated in the direction of the column direction by edge detectors and extracted as data representing only a contour portion. This contour data is classified into forms of discontinuous points with respect to the horizontal direction and the vertical direction by classifying circuits. As for the classified data, the size of a dot to be printed and a printing position are converted by a determining circuit to a pulse width and a timing at which the dot is to be generated, and the classified data is converted to a pulse width by a pulse-width modulating circuit and is outputted to a laser beam modulating device. As a result, a dot smaller than a normal dot is added in a vacant portion, or a part of a normal dot is shaved, thereby printing a smooth pattern.
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patent: 5029108 (1991-07-01), Lung
Ohmoto Ryuji
Uchino Atsushi
Yokoyama Shoji
Evans Arthur G.
Seiko Epson Corporation
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