Enhancing contrast
First Claim
Patent Images
1. A method of preparing a video signal for a display, comprising:
- processing the video signal by;
detecting ambient light levels; and
performing local contrast enhancement processing on the video signal based on the detected ambient light levels to produce a processed video signal, wherein the local contrast enhancement processing comprises a spatial filtering operation to determine luminance on a pixel-by-pixel basis; and
presenting the processed video signal to the display.
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Abstract
Video processing for enhancing contrast includes detecting the ambient light levels on a display, performing local contrast enhancement processing to emphasize the luminance component based on the detected ambient light levels to provide a processed video signal, and presenting the processed video signal on the display.
55 Citations
28 Claims
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1. A method of preparing a video signal for a display, comprising:
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processing the video signal by; detecting ambient light levels; and performing local contrast enhancement processing on the video signal based on the detected ambient light levels to produce a processed video signal, wherein the local contrast enhancement processing comprises a spatial filtering operation to determine luminance on a pixel-by-pixel basis; and presenting the processed video signal to the display. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A video processing system having a display and video signal comprising:
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a device for detecting ambient light levels on the display and for providing a detected ambient light level signal; a processor responsive to the detected ambient light level signal for; processing the video signal, and performing pixel-by-pixel contrast enhancement processing on the video signal based on the detected ambient light levels to provide a processed video signal, the contrast enhancement processing comprising performing a spatial filtering operation on the video signal to determine luminance on a pixel-by-pixel basis; and a display device having an active screen area for presenting the processed video signal on the display and surrounding areas. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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Specification