Video image enhancement utilizing a two-dimensional digital aper

Details Video image enhancement utilizing a two-dimensional digital aper Video image enhancement utilizing a two-dimensional digital aper

1989-08-28

1990-11-13

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358177, 358 37, H04N 514, H04N 5204

Patent

active

049705938

ABSTRACT:
A video camera system has a modulation transfer function (MTF). Video image data are stored in frame grabbers and converted in a digital signal processor from the image domain to the spatial domain by a two-dimensional digital Fourier transform. The spatial data are filtered by a two-dimensional aperture correction filter that has an MTF inverse to the uncorrected system MTF. The filtered spatical data are converted back into the image domain by a two-dimensional inverse digital Fourier transform. The two-dimensional digital aperture correction filter is stored in the form of software in the digital signal processor.

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patent: 4747157 (1988-05-01), Kurakake et al.
patent: 4764974 (1988-08-01), Woods
patent: 4805031 (1989-02-01), Powell
patent: 4811097 (1989-03-01), Ritter et al.
patent: 4846187 (1989-07-01), Siegel
patent: 4855829 (1989-08-01), Kihara

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