Digital halftoning with minimum visual modulation patterns
October 19, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3916096 Electronic screening Variable angle electronic halftone screening Electronic halftone screening Method and apparatus for reduction of false contours in electrically screened images Halftone contact screen and photographic method of making the screen Apparatus and method for generating a dispersed dot half tone picture from a continuous tone picture Imaging by varying the placement of elements in the pixels Apparatus for processing video signals Method and apparatus for half-tone reproduction of a varying tone original image InventorsApplicationNo. 259940 filed on 10/19/1988US Classes:358/3.19, Stochastic or random dithering358/3.21, Adaptive multi-level image reproduction358/463, Noise elimination382/270Variable threshold, gain, or slice levelExaminersPrimary: Harkcom, Gary V.Assistant: Bayerl, Raymond J. Attorney, Agent or FirmInternational ClassesH04N 001/40G06F 015/62 AbstractA digital halftone image is produced by providing a binary bit image pattern having a minimum visual noise for each density level in an image. The patterns are produced by employing a stochastic combinatorial minimization technique and a human visual system modulation transfer function (MTF) weighting function to generate a halftone pattern for each density level of the multi-level digital image signal. A halftone image is produced by modularly addressing these patterns with each pixel value in the image.Other References
Field of SearchNoise elimination | |
