Frei-Chen basis characteristics.
| W | Block feature |
|---|---|
| W1 | Vertical Gradient |
| W2 | Horizontal Gradient |
| W3 | Vertical Ripple |
| W4 | Horizontal Ripple |
| W5 | Vertical Line |
| W6 | Horizontal Line |
| W7 | Vertical Discrete Laplacian |
| W8 | Horizontal Discrete Laplacian |
| W9 | Constant Area |
| W | Block feature |
|---|---|
| W1 | Vertical Gradient |
| W2 | Horizontal Gradient |
| W3 | Vertical Ripple |
| W4 | Horizontal Ripple |
| W5 | Vertical Line |
| W6 | Horizontal Line |
| W7 | Vertical Discrete Laplacian |
| W8 | Horizontal Discrete Laplacian |
| W9 | Constant Area |
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