Backing color and luminance nonuniformity compensation for linea

Details Backing color and luminance nonuniformity compensation for linea Backing color and luminance nonuniformity compensation for linea

1992-08-12

1995-06-13

Groody, James J.

Television

Image signal processing circuitry specific to television

Special effects

348592, H04N 975

Patent

active

054247810

ABSTRACT:
A linear image compositing system which corrects for nonuniform luminance and/or color of the colored backing without incurring the penalties of edge glow, edge darkening, loss of edge detail and other anomalies. A control signal is created directly proportional to the luminance of the colored backing and controls the level of the BG scene. Unless the control signal is corrected, the background scene will contain all the brightness and color variations occurring on the colored backing. Correction factors are developed by comparing the RGB video obtained from the backing before the subject is put in place, with the ideal values of RGB that would have been obtained from a perfect backing. These correction factors correct the RGB video when the scene is scanned with the subject in place. The control signal, being zero in the subject area, may be used to inhibit the corrections in the subject area.

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