Method and apparatus for enhancing sharpness of a sequence of im

Details Method and apparatus for enhancing sharpness of a sequence of im Method and apparatus for enhancing sharpness of a sequence of im

1993-03-22

1994-12-20

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

348240, H04N 140

Patent

active

053749952

ABSTRACT:
A bandpass enhancement filter has a pass-band that tracks changes in spatial frequency due to the use of a zooming process upon a digital image signal. The primary pass-band of the enhancement filter is derived from a combination of a plurality of secondary bandpass filter sections, each having a different frequency response and each responsive to a gain adjustment. A control signal reflecting a particular zoom ratio is used in the adjustment of the gain applied to the filter sections, thereby proportioning the output of each filter section so that the combined output tracks the zooming process.

REFERENCES:
patent: 4970593 (1990-11-01), Cantrell
patent: 5257121 (1993-10-01), Steinberg

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