Method of, and apparatus for image enhancement taking ambient illuminance into account
First Claim
1. An image enhancement method, comprising:
- calculating an original-luminance contrast which is a luminance contrast with respect to an original-luminance of pixels forming an original image;
calculating a fade-luminance by reflecting a variation of perceived luminance based on an ambient illuminance into the original-luminance;
calculating a defade-luminance by converting the fade-luminance to maintain the original-luminance contrast; and
calculating a display-luminance by reflecting the variation of luminance as perceived by the ambient illuminance into the defade-luminance.
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Accused Products
Abstract
A method of and an apparatus for image enhancement taking ambient illuminance into consideration. The image enhancement method includes calculating an original-luminance contrast which is a luminance contrast with respect to an original-luminance of pixels forming an original image, calculating a fade-luminance by reflecting the variation of perceived luminance based on an ambient illuminance into the original-luminance, calculating a defade-luminance by converting the fade-luminance to maintain the original-luminance contrast, and calculating a display-luminance by reflecting the variation of perceived luminance by the ambient illuminance into the defade-luminance. Improving luminance contrast through adjustment of luminance based on ambient illuminance, effectively reduces the fade phenomenon.
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Citations
22 Claims
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1. An image enhancement method, comprising:
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calculating an original-luminance contrast which is a luminance contrast with respect to an original-luminance of pixels forming an original image;
calculating a fade-luminance by reflecting a variation of perceived luminance based on an ambient illuminance into the original-luminance;
calculating a defade-luminance by converting the fade-luminance to maintain the original-luminance contrast; and
calculating a display-luminance by reflecting the variation of luminance as perceived by the ambient illuminance into the defade-luminance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An image enhancement apparatus, comprising:
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an original-luminance contrast calculation part calculating an original-luminance contrast which is a luminance contrast with respect to an original-luminance of pixels forming an original image;
a fade-luminance calculation part calculating a fade-luminance by reflecting a variation of luminance as perceived based on an ambient illuminance into the original-luminance;
a defade-luminance calculation part calculating a defade-luminance by converting the fade-luminance, which is calculated by the fade-luminance calculation part, to maintain the original-luminance contrast which is calculated by the original-luminance contrast calculation part; and
a display-luminance calculation part calculating a display-luminance by reflecting the variation of luminance as perceived by the ambient illuminance into the defade-luminance calculated by the defade-luminance calculation part. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of reducing a fade phenomenon in an image display device, the method comprising:
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inputting a value indicating an ambient illuminance of the display device;
determining a luminance and a contrast of an image being displayed;
adjusting the luminance of the image being displayed based on the input ambient illuminance value, the determined luminance and the determined contrast; and
limiting the adjusted luminance to a predetermined range.
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22. A method of reducing a fade phenomenon in an image display device, the method comprising:
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determining an original-luminance contrast, which is a luminance contrast with respect to an original-luminance of pixels forming an original image;
determining a defade-luminance contrast, which is a luminance contrast with respect to a defade luminance; and
equalizing the defade-luminance contrast and the original-luminance contrast.
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Specification