Apparatus and method for automatically adjusting white point during video display
First Claim
1. A method for making automatic white point adjustments during video display, comprising:
- providing a display system for displaying video images, the display system having a first white point;
measuring ambient light conditions, the ambient light having a second white point, whereby the second white point corrupts the first white point such that an input video signal has a third white point corresponding to the corrupted first white point;
applying a correction to the input video signal to shift the third white point toward the first white point.
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Abstract
The present disclosure relates to systems and processes for automatically adjusting the white point of displayed images to account for changes in ambient light. In one embodiment, a display system includes a display device having sensors for recording the red (R), green (G) and blue (B) values for ambient light and measuring the intensity of such light. The sensors feed these values into a processor, which calculates R, G, B gain values to be applied to the video input R, G, B values. In this manner, the display device can account for changes in ambient light to adjust the perceived white point accordingly. Related methods for automatically adjusting the white point of a perceived image are also described.
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Citations
20 Claims
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1. A method for making automatic white point adjustments during video display, comprising:
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providing a display system for displaying video images, the display system having a first white point;
measuring ambient light conditions, the ambient light having a second white point, whereby the second white point corrupts the first white point such that an input video signal has a third white point corresponding to the corrupted first white point;
applying a correction to the input video signal to shift the third white point toward the first white point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for making automatic white point adjustments during video display, comprising:
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providing a display system for displaying video images, the display system having an intended white point;
measuring ambient light conditions to account for corruption of the intended white point by ambient light;
storing three or more three-dimensional gain maps in a processor associated with the display system, the gain maps having gain values corresponding to shifts in white point; and
extracting gain values from the gain maps and applying the gain values to an input video signal, thereby adjusting the input video signal to compensate for ambient light corruption. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A system for making automatic white point adjustments during video display, comprising:
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a display system having an intended white point, the display system operable to receive a video input signal;
one or more sensors associated with the display system, the one or more sensors operable to measure ambient light; and
a processor associated with the display system, the processor being operable to determine a correction to be applied to the video input signal to compensate for corruption of the intended white point by ambient light. - View Dependent Claims (19, 20)
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Specification