57 Figure 2 – Rocks with labeled minerals (left), red scale bar = 1 mm. Number of mineral labels (right) Figure 3 – Mineral identification and measurement model: Detectron2 (Honda, 2020) and scikitimage. Region Proposal Network (RPN): Composed of three CNNs, it generates regions of interest with potential object presence. Anchors of different sizes are placed at each pixel of the P2-P6 feature maps. Two loss functions are used: objectness loss (loss_rpn_cls), which evaluates object presence, and localization loss
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