Preprocessing step for a set of images taken under different illuminations.

Hi Guys!

I have a set of images taken under different illuminations. In order to manipulate for the uniform intensity, do you guys have any suggestions about the preprocessing step?

Thank you.

[darova]

Please explain more. What kind of preprocessing you want to do?

[kittisak phetpan]

I used a smartphone camera to take the plant leaves images under the natural lighting. Based on this, I'm looking for some preprocessing either to normalize these images or do something to diminish the different light effect.

Thank you very much.

Answer 1

[Image Analyst]

You need to have something in your image that is the same from photo to photo, like an X-rite Color Checker chart or some other kind of standard. Then it depends on if there is a color shift or merely a brightness shift. The easiest thing is if there is just a brightness shift. Then you can just multiply by the ratio of the standard values in each image to scale the test photo to match the reference photo. See attached tutuorial for more info.

[kittisak phetpan]

Thank you very much for your information. It is very useful for me.