Method and apparatus for digital halftoning employing density di

Details Method and apparatus for digital halftoning employing density di Method and apparatus for digital halftoning employing density di

1990-04-16

1992-07-14

Moore, David K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358458, 358459, H04N 140

Patent

active

051308215

ABSTRACT:
Apparatus and method for converting digital, gray-level, image input data into binary valued halftone cells and preserving some of the sharpness information of the original data. The data is first converted to input halftone cells in which the pixel density gradient is analyzed to determine the density distribution within the cells. Depending upon the gradient, particular threshold value templates are selected to be used for thresholding the input data. Each template develops the output pixels beginning at different regions of the output halftone cell. The template for each input cell is selected which grows the binary pixels in the same region occupied by the densest pixels in the gray-level input data.

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Young, Tzay Y., Ed., Handbook of Pattern Recognition & Image Processing, 1986, pp. 264-265.

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