Image analysis – Histogram processing – For setting a threshold
Patent
1991-01-24
1992-03-31
Moore, David K.
Image analysis
Histogram processing
For setting a threshold
382 50, 358432, 358462, G06K 934
Patent
active
051014386
ABSTRACT:
An image area discriminating method surely distinguishes a character image area and a halftone image area printed on a single document in response to image data outputted by an image reader. An image of interest is divided into N.times.N blocks and subjected to two-dimensional orthogonal transform block by block to produce an N.times.N coefficient pattern. The blocks each is compared with coefficient patterns prepared beforehand and matching the characteristics of character images to see if the block lies in a character image area or in a halftone image area. The N.times.N coefficients may be replaced with N.times.N vectors. Then, a necessary number of vectors are selected out of the N.times.N vectors to generate a .upsilon.-dimensional coefficient vector, and it is compared with vecotrs prepared beforehand for character identification and matching the characteristics of character images.
REFERENCES:
patent: 4293920 (1981-10-01), Merola
patent: 4403257 (1983-09-01), Hsieh
patent: 4447830 (1984-05-01), Stoffel
patent: 4504860 (1985-03-01), Nicol et al.
patent: 4741046 (1988-04-01), Matsunawa et al.
Ichimura Hajime
Ishii Hitoshi
Kanda Yoshimichi
Couso Jose L.
Moore David K.
Ricoh & Company, Ltd.
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