How to calculate the radiance of a pixel.

Question

Vanessa 2017-5-8

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https://ww2.mathworks.cn/matlabcentral/answers/339250-how-to-calculate-the-radiance-of-a-pixel

回答： Image Analyst 2017-5-10

Hi all,

I have a grayscale image and I have the intensity values of all the pixels. I need help converting this pixel intensity value to the radiance of the pixel in W/m2/sr. If anyone can help me with this, I will greatly appreciate it.

Kind regards,

Vanessa

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Answer 1

Rahul Goel 2017-5-10

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https://ww2.mathworks.cn/matlabcentral/answers/339250-how-to-calculate-the-radiance-of-a-pixel#answer_266487

Hello Vanessa,

W/m2/sr is a function of camera sensor. It will need a known transfer function/gauge/lookup table to convert grayscale values to radiance for this particular camera sensor. Basically, a function of the camera's sensitivity for each color channel (if it's a color sensor) and then you'd have to also account for the grayscale conversion (red is ~.4, green is something close to that and blue is ~.15)

Hope this helps