Good day Laurent,
from a pre-processed version (windowed and DC-free, i.e. the shown image was actually bipolar and the mean gray corresponds to zero) of your sample image
I generated what I call its “Orientation Salience”-function:
It shows the salience of image structures as a function of the orientation angle. The plot starts with the horizontal orientation and the angle increases counter-clockwise. Please note that the salience depends also on the contrast of the structures, i.e. it isn’t a purely geometric measure!
I have very limited knowledge in image post-processing - so any step-by-step input would be greatly appreciated.
This report describes the generation of “Orientation Salience”-functions and you may probably realize that this is not the way you like to go …
So if you think that this kind of analysis is helpful for you and if you have only a limited amout of images to analyze, you could make them accessible for me in the original uncompressed RAW- or TIF-format and I’d return the plots to you.