Image analysis – Histogram processing – For setting a threshold
Patent
1988-11-29
1991-03-19
Moore, David K.
Image analysis
Histogram processing
For setting a threshold
358453, 358462, 358466, 382 53, G06K 938
Patent
active
050017675
ABSTRACT:
An image processing device capable of processing images containing poorly contrasted letters and/or bold letters in addition to well contrasted letters and pictures such that both resolutions of letters and tones of pictures can be preserved. The device may includes a circuit to distinguish two level images from non two level images according to image concentration related quantity, and a circuit to distinguish picture images out of non two level images according to another image concentration related quantity. The device may include a circuit to distinguish letters from pictures according to the maximum and the minimum values of the image concentration related quantity. The device may includes a circuit to distinguish letters from pictures according to the maximum and the minimum values of changes in the image concentration related quantity. The device may include a circuit to distinguish letters from pictures according to the square sum average of differences in the image concentration related quantity between neighboring picture elements.
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English translation abstract of Japanese Patent Application 58-3374.
Izawa Koji
Kanno Hiroki
Machida Hironobu
Yoneda Hitoshi
Kabushiki Kaisha Toshiba
Mancuso Joseph
Moore David K.
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