luminance of an image

6 Ansichten (letzte 30 Tage)
umar siyab
umar siyab am 2 Apr. 2012
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

Melden Sie sich an, um diese Frage zu beantworten.

Antworten (1)

Image Analyst
Image Analyst am 2 Apr. 2012
Use rgb2gray() if you're starting with an RGB image.
  2 Kommentare
umar siyab
umar siyab am 3 Apr. 2012
i know that dear i m talking about the luminance of an image will you get my question?????
Image Analyst
Image Analyst am 3 Apr. 2012
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.

Melden Sie sich an, um zu kommentieren.

Kategorien

Mehr zu Get Started with Image Processing Toolbox finden Sie in Help Center und File Exchange

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by