Image processing apparatus

Details Image processing apparatus Image processing apparatus

1997-11-07

2000-02-15

Lee, Thomas D.

Image analysis

Histogram processing

382169, 382171, 358455, 358462, 358464, G06K 900

Patent

active

060261811

ABSTRACT:
An image signal representing the data picked up from an original is input from the input terminal and stored in the memory. A feature data extracting circuit produces a density value histogram showing the number of pixels (distribution frequency) with respect to density level in accordance with the image data stored in the memory. The feature data extracting circuit extracts the modal density value 1p and a quotient per1 which is obtained by dividing the number of pixels relating to this density value 1p by the total number of pixels used for preparation of the histogram, as feature data for recognizing the features of an original. From these two pieces of feature data, the original is recognized as text, photography or other features, and based on a density correction table selected in accordance with the recognition, a density correcting circuit performs density correction of the input image signal to output the result from the output terminal.

REFERENCES:
patent: 4962433 (1990-10-01), Matsushima et al.
patent: 5748773 (1998-05-01), Tashiro et al.
patent: 5831748 (1998-11-01), Tsukada et al.
patent: 5953450 (1999-09-01), Kanamori

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