Image processing apparatus

Details Image processing apparatus Image processing apparatus

1995-03-16

1997-12-23

Coles, Sr., Edward L.

Image analysis

Image segmentation

Distinguishing text from other regions

382235, 3582611, 358462, G06K 934, H04N 1419

Patent

active

057013640

ABSTRACT:
A run length which is the length of a run representing continuous black pixels is calculated on the basis of binary image data, and an extending process is performed for the run using a target pixel as an object to generate an extended run. An extended run length representing the length of the extended run and a maximum run length representing the length of the longest run in the range of the extended run are calculated. If a difference between the extended run length and the maximum run length is smaller than a predetermined value, an image near the target pixel is determined as a character image. If the difference is equal to or larger than the predetermined value, the image is determined as a half-tone image. In this manner, accuracy in separation between the half-tone area and the character area in a document image can be improved.

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patent: 4682215 (1987-07-01), Adachi
patent: 4879753 (1989-11-01), El-Sherbini
patent: 5016118 (1991-05-01), Nannichi
patent: 5048096 (1991-09-01), Beato
patent: 5335290 (1994-08-01), Cullen et al.
patent: 5465304 (1995-11-01), Cullen et al.

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