list available image levels in wsi

[mhoibo]

Hi!
I was wondering if there is an easy way to list all available image levels in a wsi with fast? Or if I have to check if a level exist by testing, for example through extracting a patch from a level or visualizing a level?

I want to extract patches from random levels in wsis, using the fast PatchGenerator, and thus want to know which levels already exist, to avoid the script from crashing when trying to extract from levels that does not exist.
Thank you in advance :)

[mhoibo]

I think I figured it out, getNrOfLevels() on the image pyramid

[smistad]

Yes you can use image.getNrOfLevels().
With this you can also loop over all levels if you wish to inspect the size of each level:

for i in range(image.getNrOfLevels()):
    print(i, image.getLevelWidth(i), image.getLevelHeight(i))

You can see all the methods available for image pyramids here: https://fast.eriksmistad.no/classfast_1_1ImagePyramid.html#a2d796e7933254635ce4a7a0fa5e45cb1

[mhoibo]

Thank you!