I want to normalize several images in imageJ using the mean pixel value in a ROI (located in the same position in all the images), so that after applyng a normalization factor the mean pixel value in this ROI is the same in all the images. For example, dividing the pixel values on each image by the mean PV in the ROI and multiply by 10000 so that in all the images the mean PV in this region is 10000).
Alternatively, it may be sufficient if I use the pixel value of a point in a fixed coordinate (the same in all images) instead of a ROI.
How can I do it? (preferably a method that can be easily implemented with a macro)