luminance of an image
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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
2012-4-2
Use rgb2gray() if you're starting with an RGB image.
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Image Analyst
2012-4-3
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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