Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1997-01-24
1999-04-27
Wong, Peter S.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358457, 382270, 395109, H04N 1405
Patent
active
058985050
ABSTRACT:
A print apparatus performs a halftoning action on a raster pixel image. The print apparatus includes a super-pixel data base for storing plural n.times.n superpixels, each superpixel corresponding to a subset (or "bucket") of gray level pixel values. The method comprises the steps of: logically tiling a dither matrix across the raster pixel image and outputting a threshold value which, logically and positionally corresponds to a given image pixel value. The given image pixel value is then quantized into a selected bucket of pixel values which encompass the given image pixel value. A proportionality value is then determined which identifies the relative position of the given image pixel value within the selected bucket of pixel values. The outputted threshold value is then compared to the determined proportionality value, and the selected bucket number is incremented to a next sequential bucket number if the proportionality value exceeds the threshold value. A superpixel is next selected that is identified by the selected bucket number or the next sequential bucket number, as the case may be. A superpixel includes plural halftone pixel values and the method selects one of those halftone pixel values that is positioned at a location determinable from the coordinates of the given image pixel value. The selected halftone pixel value from the superpixel is then passed to the print engine of the printer for rendering. The method of the invention is carried out, preferably, by an application specific integrated circuit so as to enable high speed halftoning of the raster image.
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Hoffmann Brian
Lin Qian
Trask Jeffrey L.
Hewlett--Packard Company
Toatley , Jr. Gregory J.
Wong Peter S.
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