luminance of an image

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umar siyab
umar siyab 2012 年 4 月 2 日
how can i take the luminance of an image in matlab if i have i 256x256 image and i want the luminance of gray scale... what procedure for that can anyone tell me
thnx in advance regards

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Image Analyst
Image Analyst 2012 年 4 月 2 日
Use rgb2gray() if you're starting with an RGB image.
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umar siyab
umar siyab 2012 年 4 月 3 日
i know that dear i m talking about the luminance of an image will you get my question?????
Image Analyst
Image Analyst 2012 年 4 月 3 日
Then if you REALLY want luminance (http://en.wikipedia.org/wiki/Luminance) in units of candela per square meter, you're going to have to do a radiometric calibration. Basically make a relationship between your recorded gray level and the "known" luminance from a light emitting source that has been measured with an instrument that measures in candelas per square meter or nits.

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