I have a stack of image tiles (taken from a drone) that I want to mosaic to a single image. I want to do exposure compensation to reduce the variation in illumination between the image tiles before mosaicking due to variations within each image. I have seen the following formula used for such a task:
where:
p' is the correct pixel
p is the original uncorrected pixel
k is the aperture F number
t is the exposure time
K is the ISO
From my EXIF metadata data I am getting the following values:
k = 2.200000078
t = 0.002007692122
K = 100
This gives me a correction factor of 24.1072836326 (based on the above equation), which if I use to multiple against all the pixels (p) in the image, results in a drastic change in pixel values (p'). Is there something I am doing incorrectly here? For example are my units correct?