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Coarse-to-fine registered images: (a1). H&E images (20× magnification), (a2). H&E masks, (b1). CD31 images (40× magnification), (b2). CD31 masks. For each set, left to right: i. Original image/mask, ii. Coarsely registered image/mask using Thevenaz’s algorithm, iii. Finely registered images/masks using spatial transformers. The x axis applies to the respective column. The values are specified in pixels.
