Hi guys, general question here. I think this might have been questioned many times but my searches always end up in some rabbit hole.
As per the title, is there an objective way to establish the power intensity in mW of an ROI in a camera feed?
I've been using the method to convert the readings from my camera using the mean of the ROI (the code is something like follows:)
mean = cv::mean(ROI);
But the intensity, as far as I understood it, is relative or in arbitrary units (a.u.).
Is the measure of intensity, if need be in mW, the sum of all the pixel intensities in an array ROI?
My golden standard is if possible, we can make the measurement comparable to a photodiode or a power meter.
How do we link the scalar value with an absolute unit of power?
Thanks. Vizier87