Use of both SlidingPatchWSIDataset and MaskedPatchWSIDataset

[sweenke4]

I am wanting to use SlidingPatchWSIDataset to extract patches from my whole slide images during inference (patch size 224x224, overlap 0.25).
However, I also require the WSI to be masked so as to remove the unwanted background patches from analysis. Is there any way to incorporate the two?

I am using Otsu's thresholding method to create my tissue mask at an MPP of 16 (currently save in both numpy file and geoPandas df as a polygon), and am wanting my patches to be extracted at mpp of 1.008 (level 0). How do I use this mask in my dataset?

These two classes look very useful but I cannot find any examples of their usage online.