Update README.md

README.md

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-license: cc-by-4.0
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+---
+license: cc-by-4.0
+---
+
+### Synthetic Signals 
+
+Each signal is \~1M values (1000×1000 or 100×100×100), enabling fair compression analysis.
+
+| Signal Type        | Class Name           | Dim   | Description                                    |
+| ------------------ | -------------------- | ----- | ---------------------------------------------- |
+| Spheres            | `SparseSphereSignal` | 2D/3D | Random circles or spheres with varying scale   |
+| Bandlimited        | `BandlimitedSignal`  | 2D/3D | Low-pass filtered noise with varying frequency |
+| Sierpinski Triangle| `Sierpinski`         | 2D    | Triangle shaped fractal structure              |
+| Star Target        | `StarTarget`         | 2D    | Radial wedges with increasing bandwidth        |
+
+### Real-World Signals
+
+| Dataset       | Class Name      | Description                                                                          |
+| ------------- | --------------- | ------------------------------------------------------------------------------------ |
+| **DIV2K**     | `RealImage`     | 10 high-res images from DIV2K for image fitting, 4× SR, and denoising                |
+| **3D Dragon** | `Voxel_Fitting` | Stanford Dragon. `sparse=True` loads surface version; `False` loads occupancy volume |
+| **CT Scan**   | -               | 2D human chest CT slice for reconstruction under sparsity                            |