Fig. 3From: Development of a modified 3D region proposal network for lung nodule detection in computed tomography scans: a secondary analysis of lung nodule datasetsIllustration of the nearest anchor method. The IoU-based method could recognize both blue and yellow anchor boxes as positive samples. In contrast, the nearest anchor method recognized the blue anchor as the positive anchor, because it had an anchor point closest to the ground truth (green)Back to article page