Real-time, localized enhancement of a video image using separabl

Details Real-time, localized enhancement of a video image using separabl Real-time, localized enhancement of a video image using separabl

1984-11-23

1987-05-19

Harkcom, Gary V.

Boots, shoes, and leggings

364807, 364518, 364812, 358160, 358169, G06G 700, H04N 514

Patent

active

046673040

ABSTRACT:
A video signal producing a raster-scanned image is processed in real time to enhance high frequency characteristics of the image generated by the signal, with the enhancement performed according to a local adaptive process implemented in an apparatus including one or more two-dimensional higher-order filters. Each filter provides a signal corresponding to a statistical measure of the raster image at a point in the image centered in a local area. In each case, the measure is a function of characteristics of the image within the centered area. Each filter is synchronized with the video signal to provide its respective statistical signal substantially in real time and in phase with the input video signal.

REFERENCES:
patent: 4057828 (1977-11-01), Monahan
patent: 4081838 (1978-03-01), Wheeler
patent: 4187519 (1980-02-01), Vitols et al.
patent: 4506292 (1985-03-01), Newton et al.
"Local Adaptive Enhancement: A General Discussion and Fast Implementations" by E. C. Driscoll, Jr. and C. Walker, 1983, Machine Processing of Remotely Sensed Data Symposium, pp. 266-271.
"Active RC and Switched Capacitor" by M. S. Ghausi and K. R. Laker, Modern Filter Design, pp. 76-81, 221-226.
"Real-Time Adaptive Contrast Enhancement" by P. M. Narenda and R. C. Fitch, IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. PAMI-3, No. 6, Nov. 1981, pp. 655-661.

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