Image area determining apparatus

Details Image area determining apparatus Image area determining apparatus

1992-02-27

1994-01-11

Mancuso, Joseph

Image analysis

Histogram processing

For setting a threshold

358453, 358462, 358465, 382 28, 382 50, G06K 934

Patent

active

052789195

ABSTRACT:
An image area determining apparatus acquires a multi-value image to determine to which one of a picture area and a character area an image signal of the multi-value image belongs. A density detecting unit detects whether or not a density value of the multi-value image is within a range between two preset density threshold values. A density variation amount detecting unit detects whether or not a variation amount of the density value of the multi-value image is less than a preset density variation threshold value. The determining apparatus determines that the multi-value image is related to a picture area when the density value of the received multi-value image is within the range between the two density threshold values and the density value variation amount of the multi-value image is less than the density variation threshold value.

REFERENCES:
patent: 4503556 (1985-03-01), Scherl et al.
patent: 4547811 (1985-10-01), Ochi et al.
patent: 4741046 (1988-04-01), Matsunawa et al.
patent: 4750209 (1988-07-01), Shimura et al.
patent: 4893188 (1990-01-01), Matakami et al.
patent: 4905294 (1990-02-01), Sugiura et al.

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