Method for enhancing an image displayed on an LCD device
First Claim
1. A method for controlling a display controller to enhance an image displayed on a display that is controlled by the display controller and illuminated by a lighting device, the image comprising a plurality of pixels, each pixel having an individually adjustable property, the display comprising a transmittance level for each pixel of the image, the method comprising:
- storing a mapping function in a non-transitory machine readable storage medium of the display controller, wherein the mapping function includes a linearly decreasing mapping portion, a non-linear mapping portion, and a constant portion;
determining an illumination level of the lighting device for each pixel;
determining, by use of the mapping function and the illumination level, a respective compensation factor for each pixel, includingusing the linearly decreasing mapping portion to determine the compensation factor when the illumination level is below a first threshold,using the non-linear mapping portion to determine the compensation factor when the illumination level is above the first threshold and below a second threshold; and
using the constant portion to determine the compensation factor when the illumination level is above the second threshold;
adjusting the property of each pixel by the compensation factor of the respective pixel; and
adjusting the transmittance level of the display for each pixel by the adjusted property of the respective pixel.
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Accused Products
Abstract
A method and apparatus for image enhancement in a display illuminated by a lighting device. Enhancement is via use of a non-linear mapping function. An illumination level for the lighting device is determined and used with the mapping function to find a compensation factor for each pixel of the image. The brightness property of each pixel is adjusted by its compensation factor.
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Citations
10 Claims
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1. A method for controlling a display controller to enhance an image displayed on a display that is controlled by the display controller and illuminated by a lighting device, the image comprising a plurality of pixels, each pixel having an individually adjustable property, the display comprising a transmittance level for each pixel of the image, the method comprising:
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storing a mapping function in a non-transitory machine readable storage medium of the display controller, wherein the mapping function includes a linearly decreasing mapping portion, a non-linear mapping portion, and a constant portion; determining an illumination level of the lighting device for each pixel; determining, by use of the mapping function and the illumination level, a respective compensation factor for each pixel, including using the linearly decreasing mapping portion to determine the compensation factor when the illumination level is below a first threshold, using the non-linear mapping portion to determine the compensation factor when the illumination level is above the first threshold and below a second threshold; and using the constant portion to determine the compensation factor when the illumination level is above the second threshold; adjusting the property of each pixel by the compensation factor of the respective pixel; and adjusting the transmittance level of the display for each pixel by the adjusted property of the respective pixel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification