Method and apparatus for acquiring luminance information and for evaluating the quality of a display device image
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United States of America Patent
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-
Apr 26, 2005
Grant Date -
Aug 29, 2002
app pub date -
Feb 13, 2002
filing date -
Feb 23, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for evaluating the quality of an image, for extracting a luminance gradient displayed on a display device and for evaluating local luminance unevenness caused therein. The method includes the steps of: subdividing the image to be used as an evaluation object into a plurality of pixels; acquiring a first luminance information by calculating the difference between the sum of luminance values of predetermined pixels and the luminance value of a predetermined pixel, the predetermined pixels forming a first pixel group surrounding the predetermined pixel; acquiring a second luminance information by calculating the difference between the sum of luminance values of predetermined pixels and the luminance value of the predetermined pixel, the predetermined pixels constituting a second pixel group; acquiring a third luminance information by adding the first luminance information and the second luminance information; and evaluating the luminance of a screen photographed based on the third luminance information.
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