US PATENT SUBCLASS 382 / 270
.~ Variable threshold, gain, or slice level

Current as of: June, 1999
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382 /   HD   IMAGE ANALYSIS

254  DF  IMAGE ENHANCEMENT OR RESTORATION {7}
270.~ Variable threshold, gain, or slice level {3}
271  DF  .~.~> Based on the results of a count
272  DF  .~.~> Based on a local average, mean, or median
273  DF  .~.~> Based on peak levels

DEFINITION

Classification: 382/270

Variable threshold, gain or slice level:

(under subclass 254) Subject matter wherein quantization of an input analog or gray scale image to produce an output gray scale image or bit map utilizes a threshold, gain or slice level which self-adjusts according to characteristics such as the contrast or brightness of the image or portion of the image being processed.

(1) Note. For the purpose of this subclass, "quantization" refers strictly to amplitude quantization or digitization (i.e. assigning to each pixel* an integer value corresponding to a brightness level).

SEE OR SEARCH THIS CLASS, SUBCLASS:

251, through 253, for spatial quantization or sampling.

SEE OR SEARCH CLASS

307, Electrical Transmission or Interconnection Systems,

350+, for solid-state circuits or systems that employ variable thresholds.

358, Facsimile, 466, for variable thresholding in facsimile systems.