Fig. 3.

Image patch cropping from annotated frozen sections. Contours are annotated and validated by certified pathologists. All regions in the benign slide are considered as benign. A few white background regions are specifically set as benign regions. Benign regions can also exist on uncertain and malignant slides. Benign, uncertain, and malignant patches are randomly cropped from these annotated regions with corresponding categories. The number of cropped patches is set to be proportional to the area of the annotated region.