US PATENT SUBCLASS 382 / 263-- .~.~ Highpass filter (i.e., for sharpening or enhancing details)

US PATENT SUBCLASS 382 / 263
.~.~ Highpass filter (i.e., for sharpening or enhancing details)

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

254	DF	IMAGE ENHANCEMENT OR RESTORATION {7}
260	DF	.~ Image filter {5}
263		.~.~ Highpass filter (i.e., for sharpening or enhancing details)

DEFINITION

Classification: 382/263

Highpass filter (i.e., for sharpening or enhancing details):

(under subclass 260) Subject matter wherein low-frequency components of the image are attenuated or eliminated.

(1) Note. Generally, highpass filtering reduces overall contrast and average intensity as it sharpens edges and other sharp details.

(2) Note. Examples of highpass filters are the Laplacian,

Sobel, Roberts and Prewitt operators.

SEE OR SEARCH CLASS

348, Television,

606, and 625 through 631 for edge sharpening in television.