# Technical Document Extraction: Heatmap Analysis of UNet Variants ## Image Description The image presents four comparative heatmaps labeled **(a) PAM-UNet**, **(b) UNet**, **(c) AttUNet**, and **(d) MobileUNet**. Each heatmap visualizes a matrix of values using a color gradient from **purple (low values)** to **yellow (high values)**. No explicit legend or colorbar is provided to quantify the values. --- ### **Key Labels and Axis Titles** 1. **Y-Axis**: Labeled "PAM-UNet" across all heatmaps. 2. **X-Axis**: Unlabeled in all heatmaps. 3. **Heatmap Labels**: - (a) PAM-UNet - (b) UNet - (c) AttUNet - (d) MobileUNet --- ### **Heatmap Analysis** #### **(a) PAM-UNet** - **Pattern**: Strong diagonal dominance with high values (yellow) along the diagonal from top-left to bottom-right. - **Trend**: Values decrease symmetrically away from the diagonal, forming a gradient. - **Spatial Grounding**: Highest values concentrated along the diagonal axis. #### **(b) UNet** - **Pattern**: Uniform distribution with no clear diagonal trend. - **Trend**: Values are relatively consistent across the matrix, with occasional localized peaks (yellow regions). - **Spatial Grounding**: No dominant axis; values are scattered. #### **(c) AttUNet** - **Pattern**: Similar to UNet but with slightly more pronounced vertical/horizontal striations. - **Trend**: Values cluster in horizontal bands, suggesting feature-group dependencies. - **Spatial Grounding**: Vertical/horizontal groupings dominate. #### **(d) MobileUNet** - **Pattern**: Diagonal trend similar to PAM-UNet but with reduced intensity. - **Trend**: Diagonal values are high (yellow), but off-diagonal regions show more variability than PAM-UNet. - **Spatial Grounding**: Diagonal remains dominant but less pronounced than in PAM-UNet. --- ### **Observations** 1. **Diagonal Dominance**: PAM-UNet and MobileUNet exhibit diagonal patterns, likely indicating self-similarity or identity preservation in feature mappings. 2. **Uniformity**: UNet and AttUNet lack strong diagonal trends, suggesting more distributed feature interactions. 3. **Color Consistency**: All heatmaps use the same purple-to-yellow gradient, but no numerical scale is provided to quantify differences. --- ### **Limitations** - No explicit legend or colorbar to interpret absolute value ranges. - Unlabeled x-axis prevents identification of specific categories or sub-categories. - No textual data or tables present in the image. --- ### **Conclusion** The heatmaps compare feature interaction patterns across four UNet variants. PAM-UNet and MobileUNet show stronger diagonal correlations, while UNet and AttUNet exhibit more uniform or grouped distributions. Further analysis with quantitative metrics (e.g., correlation matrices) is required for precise comparisons.