Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-10-15
1994-07-26
Shaw, Dale M.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358448, G06F 1520
Patent
active
053332601
ABSTRACT:
Disclosed is an image processing system which relies upon quantization and dithering techniques to enable an output device, which has a given number of output levels, to accurately reproduce a image which is generated by an input device, which has a greater or equal number of input levels. Generally, neither the number of input nor output levels need to be a power of two. The present invention is implemented in a number of different embodiments. These embodiments generally rely upon an image processor which, depending on the particular implementation, includes memory devices and an adder, a comparator, or a bit shifter. Additional embodiments use an image adjustment system to refine the raw input levels of the input device, in order to create an improved output image. Also, the particular embodiments of the image processors can be used in connection with imaging systems having hi-tonal, monochromatic, or color input and output devices.
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Cefalo Albert P.
Digital Equipment Corporation
Hudgens Ronald C.
Shaw Dale M.
Tung Kee M.
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