Fig. 3From: Accuracy of advanced deep learning with tensorflow and keras for classifying teeth developmental stages in digital panoramic imagingThe example of constructed radial lines in the schematic diagram forms a closed contour on ROI. Image a depicts the assumption of radial lines emerging from the centroid, b the detected \(N{i}_{th}\) point on \({M}_{{i}_{th}}\), c the contour with the greatest directional gradient strength, (d) the region mask obtained after performing polygon to binary conversion, and e delineated ROI based on a region mask on the original input imageBack to article page