Television – Image signal processing circuitry specific to television – Gray scale transformation
Patent
1994-07-08
1997-02-18
Kostak, Victor R.
Television
Image signal processing circuitry specific to television
Gray scale transformation
348 28, 382169, 382270, H04N 514, H04N 520
Patent
active
056045450
ABSTRACT:
An image enhancement system that efficiently enhances gray scale images, wherein an analog scene is captured and a resulting analog signal is digitized to a raw gray scale image S. Image S is divided into M disjoint non-empty regions R.sub.1 . . . R.sub.M, where S.sub.i identifies region R.sub.i of S. The raw digitized signal S.sub.i is processed in accordance with an enhancement algorithm to obtain a set of enhancement parameters (offsets P.sub.i =(s.sub.ai, s.sub.bi) and weights (w.sub.i)). Digital offsets P.sub.i =(s.sub.ai, s.sub.bi) are converted to analog offsets Q.sub.i =(v.sub.ai, v.sub.bi). The analog signal is stretched and clipped and converted to a digital signal that is an enhanced image signal T.sub.i. The enhanced image signal is multiplied by weight w.sub.i to obtain the final enhanced image U.sub.i. Image U.sub.i forms the region R.sub.i of a final enhanced image U. The multiplied signals are summed to produce an enhanced summed image of the scene.
REFERENCES:
patent: 4561104 (1985-12-01), Martin
patent: 4823194 (1989-04-01), Mishima et al.
patent: 5307425 (1994-04-01), Otsuka
Chatterjee Chanchal
Roychowdhurry Vwani P.
Kostak Victor R.
Miller John W.
Purdue Research Foundation
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