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The proposed post-processing stages reduce the mean error of tooth count to 6.15%, whereas the error without post-processing is 26.81%. A dice overlap score of 95.4 - 0.3% is obtained in overall teeth segmentation. The post-processing consists of grayscale morphological and filtering operations, which are applied to the sigmoid output of the network before binarization. In this study, we propose a post-processing stage to obtain a segmentation map in which the objects in the image are separated, and apply this technique to tooth instance segmentation with U-Net network. Automatic teeth segmentation in panoramic x-ray images is an important research subject of the image analysis in dentistry. |
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