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 between an original-luminance of pixels forming an original input 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 using the original-luminance contrast and a fade-average luminance with respect to the calculated fade-luminance to maintain the original-luminance contrast; and
calculating a display-luminance for displaying an output image by reflecting the variation of luminance as perceived by the ambient illuminance, into the defade-luminance.
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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
20 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 between an original-luminance of pixels forming an original input 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 using the original-luminance contrast and a fade-average luminance with respect to the calculated fade-luminance to maintain the original-luminance contrast; and calculating a display-luminance for displaying an output image 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 between an original-luminance of pixels forming an original input 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 using the original-luminance contrast and a fade-average luminance with respect to 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 for displaying an output image 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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Specification