Method and apparatus for locally blending gray dot types of the

Details Method and apparatus for locally blending gray dot types of the Method and apparatus for locally blending gray dot types of the

1994-12-08

1999-09-21

Lee, Thomas D.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358457, 358458, 358459, 358465, H04N 140

Patent

active

059561572

ABSTRACT:
A method and apparatus for reproducing an original image includes a scanner or other image source for generating digitized raw image data for each pixel of an image. For each pixel, the raw image data is transformed into a rendering gray level value by comparing the raw image data value with threshold values from a threshold mask set. There are various threshold mask sets that may be used in accordance with a dot type that is selected based on a calculated local contrast index. The dot type being either a mixed dot type or one of a fixed threshold or a partial dot type. A printer or display is controlled to print the digitized image signal by rendering the dot regions in accordance with the selected dot type for each dot region, so that an original image that may contain different types of image regions is satisfactorily reproduced. In regions at the boundaries of two different dot regions a process of blending of the different rendering processes for the two regions is used to reduce the appearance of sharp changes between regions.

REFERENCES:
patent: 4633327 (1986-12-01), Roetling
patent: 4698688 (1987-10-01), Ochi et al.
patent: 4701806 (1987-10-01), Takashima
patent: 5200831 (1993-04-01), Tai
patent: 5258850 (1993-11-01), Tai
patent: 5300960 (1994-04-01), Pham et al.

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