Image-area identifying system for a color image processing appar

Details Image-area identifying system for a color image processing appar Image-area identifying system for a color image processing appar

1994-12-21

1998-06-16

Couso, Jose L.

Image analysis

Color image processing

Pattern recognition or classification using color

382162, 382164, 358467, 358520, 348396, G06K 900

Patent

active

057684030

ABSTRACT:
An image-area identifying system for a color image processing apparatus comprises: image area identifying means for identifying a character area or a half-tone image area by using characteristic values of pixels in each pixel block of an image area; hue determining means for determining, every pixel, hue of received color image data to produce a necessary color switch signal or an unnecessary color switch signal; and data reset means for resetting unnecessary image data on the basis of the results of the block-basis area identifying determination by the image area identifying means and the pixel-basis hue determination by the hue determining means. The image area identifying means may be nonlinear quantitizers for quantitizing three characteristic values, "in-block average value", "number of in-block high-level pixels" (Ph), and "number of in-block medium-level pixels" (Pm) for reducing the quantities of data representing the three characteristic values, and a three-dimensional look-up table accessed by the output data of the nonlinear quantitizers, to produce a character area data signal or a half-tone image data signal.

REFERENCES:
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patent: 4743959 (1988-05-01), Frederiksen
patent: 4930007 (1990-05-01), Sugiura
patent: 4982342 (1991-01-01), Moribe
patent: 5014124 (1991-05-01), Fujisawa
patent: 5113252 (1992-05-01), Horie et al.
patent: 5162860 (1992-11-01), Nami et al.

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