Image analysis – Histogram processing – For setting a threshold
Patent
1993-05-21
1997-02-11
Boudreau, Leo
Image analysis
Histogram processing
For setting a threshold
382252, 382299, 358429, 358455, G06K 942
Patent
active
056029411
ABSTRACT:
This disclosure relates to 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 or an image modification 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 bi-tonal, monochromatic, or color input and output devices.
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Charles Patrick D.
McNamara Robert S.
Ulichney Robert A.
Anderson David R.
Boudreau Leo
Digital Equipment Corporation
Fisher Arthur W.
Maloney Denis G.
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