Method of improving the perceptual contrast of displayed images
First Claim
1. A method of processing an image comprising:
- measuring a set of pixel dependent attributes for a pixelated video frame, each pixel of said frame having a gray level, each gray level associated with a brightness level; and
in response to each and every pixel dependent attribute of said set of pixel dependent attributes meeting a corresponding criteria, decreasing the overall brightness of said video frame in accordance with a global brightness signal and increasing the brightness of the gray level of each pixel of said video frame in accordance with a local brightness control signal, the amount a particular gray level brightness is increased being dependent upon the particular gray level and a function of said measured pixel dependent attributes.
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Abstract
A method of processing an image comprising: measuring a set of pixel dependent attributes for a pixelated video frame, each pixel of the frame having a gray level, each gray level associated with a brightness level; and in response to each and every pixel dependent attribute of the set of pixel dependent attributes meeting a corresponding criteria, decreasing the overall brightness of the video frame in accordance with a global brightness signal and increasing the brightness of the gray level of each pixel of the video frame in accordance with a local brightness control signal, the amount a particular gray level brightness is increased being dependent upon the particular gray level and a function of the measured pixel dependent attributes.
88 Citations
20 Claims
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1. A method of processing an image comprising:
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measuring a set of pixel dependent attributes for a pixelated video frame, each pixel of said frame having a gray level, each gray level associated with a brightness level; and
in response to each and every pixel dependent attribute of said set of pixel dependent attributes meeting a corresponding criteria, decreasing the overall brightness of said video frame in accordance with a global brightness signal and increasing the brightness of the gray level of each pixel of said video frame in accordance with a local brightness control signal, the amount a particular gray level brightness is increased being dependent upon the particular gray level and a function of said measured pixel dependent attributes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for processing an image comprising:
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means for measuring a set of pixel dependent attributes on a pixelated video-frame, each pixel of said frame having a gray level, each gray level associated with a brightness level;
means for decreasing the overall brightness of said video frame by an amount in response to each and every pixel dependent attribute of said set pixel dependent attributes meeting a corresponding criteria; and
means for increasing the brightness of the gray level of each pixel of said video frame by different amounts in response to each and every response to each and every pixel dependent attribute of said set pixel dependent attributes meeting a corresponding criteria, the amount a particular gray level brightness is increased being dependent upon the particular gray level and a function of said measured pixel attributes. - View Dependent Claims (10, 11, 12)
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13. A system for projecting an image onto a display screen comprising:
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a light source;
a light-attenuating device for attenuating light emitted from said light source, said light-attenuating device responsive to a global brightness control signal;
a reflective electro-optical modulating device onto to which exit light from said light-attenuating device is projected, said electro-optical modulating responsive to a local brightness adjusted video signal;
means for projecting light reflected from said electro-optical modulating device onto said display screen;
a histogram analyzer adapted to receive a pixelated video frame of said image and to output said global brightness control signal, said global brightness control signal reducing the brightness of every pixel in said frame, adapted to output said local brightness adjusted video signal, said local brightness adjusted video signal increasing selected gray-levels of said pixelated frame and said histogram analyzer adapted to analyze the pixels of said frame, said global brightness control signal and said local brightness adjusted video signal based on said analysis of said pixels. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification