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Apparatus-for-allowing-operator-selection-of-a-color-region-of-a-video-image-for-receiving-color-corrections

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Details

Inventors: Fearing, Craig; Orsburn, Michael L.;
Assignee: Utah Scientific Advanced Development Center, Inc. (Ft. Lauderdale, FL)
Primary Examiner: Shepperd; John W.
Assistant Examiner:
Attorney, Agent or Firm: Jones, Askew & Lunsford

A video parameter control system operative for correcting hue, saturation and luminance of a color video signal. Circuitry for generating and positioning a cursor on a video monitor displaying an uncorrected input video signal allows selection of a colored region on the monitor. Circuitry responsive to the cursor location selects one of a plurality of color correction circuits to become operative for directing video parameter correction such as hue, saturation and luminance only to regions in the video image corresponding to the hue selected by the cursor. In one embodiment, prestored digital correction values are retrieved from memory and converted into analog correction signals which modify the phase, amplitude and DC level of the composite video signal. In another embodiment, independent color derivative signals are employed in conjunction with the location of the cursor to route signals from operator controls to a channel carrying video signals of the selected hue.

DETAILED DESCRIPTION The present invention overcomes certain disadvantages in the control-per-hue approach employed in the referenced copending application and the Belmares-Sarabia patent by allowing selection of a hue or colored region in the video image without requiring the operator of the system to mentally associate a hue with a set of controls.
In particular, the video image is displayed on a color monitor, and a portion of the video image over which control is to be effectuated is selected by placing a cursor over a colored region of interest whose colorimetry characteristics require correction.
A single set of hue, saturation and luminance controls then is automatically rendered operative to provide corrections only for the range of hues within the window represented by the hue selected by the cursor.
Briefly described, the present invention comprises in a video color correction system, an improved apparatus for selecting a color for correction including means for selecting a colored region for correction and color correction means responsive to affect the selected region only.
In the preferred embodiment, a track ball or other operator control means is provided for selecting a region on a color monitor displaying an image of the input video signal for which color correction is required.
A cursor which is variably positionable with respect to the displayed image is generated for selecting a color of interest and is moved with the track ball.
Circuitry responsive to the location of the cursor selects one of a plurality of video signal correction signals corresponding to a parameter of the selected region, for example, the hue, saturation or luminance as a function of the selected color.
Finally, color correction means responsive to the selected correction signal corrects video parameters of the input video signal to provide a corrected video output signal.
More particularly described, the present invention provides an apparatus for correcting a video parameter of a portion of a video image at least partially defined by a predetermined hue

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