Method for discriminating between figure and text areas of an im

Details Method for discriminating between figure and text areas of an im Method for discriminating between figure and text areas of an im

1992-08-11

1995-01-10

Ip, Paul

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358456, H04N 140

Patent

active

053812417

ABSTRACT:
The present invention relates to a method for discriminating between figure areas, e.g., half-tone photographs, drawings and the like, and text areas in an image. More specifically, an image is processed to determine the difference between maximum and minimum brightnesses in convolutions thereof. When the difference between the maximum and minimum brightnesses is less than or equal to a predetermined level, the center pixel in the convolution is determined to be a half-tone pixel. A half-tone area is detected by determining areas of the image having at least a predetermined number of half-tone pixels. In another aspect of the invention, contiguous areas of the image having fewer than a predetermined number of configuration pixels are determined to be vacant areas having neither figure nor character information.

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