The cuCIM whole-slide image reader should support reading by microns-per-pixel (MPP) or by magnification. Currently, the user has to perform calculations to determine if a level with the desired resolution is stored in the WSI, and if not, determine which other level to read and perform resizing to the desired resolution.

cuCIM should allow the user to specify the MPP (ex. 0.25) or magnification (ex. 40) when reading a region. If a level with matching resolution is not available, cuCIM should read the appropriate level (typically next higher) and perform the resizing operation for the user. Since we are dealing with floats, the level MPP or objective might not match exactly, and possibly a tolerance is needed to determine a match.

This functionality is implemented in the TIAToolBox and the large_image libraries. @manthey and @shaneahmed can provide inputs on how their interfaces are designed.