Normalization over multiple images

[Bulkilol]

Hello,

We have aerial images that we want to aggregate to do an orthophoto (we use Photoscan to do it). However, we want to improve the contrast before doing so, using Imagemagick. For this we use the command

Code: Select all

convert in.jpg -normalize out.jpg

where I script over all the images we have. While the result looks great for individual pictures, the contrast is not great for the whole set.
Indeed, we fly over snow, water and vegetation, so two consecutive sometimes go darker because there is a patch of snow (so it is saturated in white). This makes it harder for Photoscan to register correctly those images, and the result looks weird (an area of the orthophoto is darker for no reasons).

Is it possible to normalize each individual image, but taking into account that it is part of a whole folder of images?

[snibgo]

You can append the images together, normalize, then split them. However, if the camera settings change between the photos (eg the aperture closes down for the snow) this probably doesn't solve your problem. You probably want to adjust some images so they match the others.

See related thread viewtopic.php?f=1&t=23727