Research Article
TISNet-Enhanced Fully Convolutional Network with Encoder-Decoder Structure for Tongue Image Segmentation in Traditional Chinese Medicine
Table 2
Description of the evaluation metrics.
| Metric name | Abbr. | Range | Interpretation | Category |
| Dice similarity coefficient | DSC | 0–1 | Similarity between masks | Overlap | Hausdorff distance | HD | >0 | Longest Euclidean distance between mask contours (absolute error) | Distance | Symmetric mean absolute | MSD | >0 | Mean Euclidean distance between mask contours (mean error) | Distance | Surface distance precision | PPV | 0–1 | Low values mean that the method tends to over segment | Statistical | Sensitivity | TPR | 0–1 | Low values mean that the method tends to under segment | Statistical | Specificity | TNR | 0–1 | Quality of segmented background | Statistical |
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