Is the intensity reading by pixel proportional to the photon count?

OpenMV Products
1

To be more precise, I would like to know for example if I double the integration time, will the reading by pixel will double as well or there is some kind of gamma correction or else processed on board?

2

The camera ISP applies gamma correction. It’s a normal step.

3

I understand. However, is it possible to access the raw data without the gamma correction? The ones that should be proportional to the photon count or the absolute luminosity?

4

Yes, use the RAW BAYER image.

Set the pic format to BAYER.

Note, on the OV5640 the raw bayer image is still processed by default. If you have a MT9V034 sensor then this will be unprocessed.

5

Thanks for the quick reply. I will look for the MT9V034 and test if the readings are linear with the exposure time for a constant light source.