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Comparison of NLOS imaging computation and memory complexity.
| Algorithms | Computational complexity | Memory complexity | Execution time | ||
|---|---|---|---|---|---|
| CLIP reconstruction (s) | NLOS reconstruction (s) | Total reconstruction (s) | |||
| f-k migration | o(N5logN) + o(N3logN) | ~o(50N3) | 0 | 15.1+ 0.65 (CPU) | 15.7 (CPU) |
| Time-domain phasor field | o(N5) | o(N3) | 0 | 0.40 (GPU) | 0.40 (GPU) |
| Hybrid time–frequency method | o(N4) | o(N3) | 2.0 or 0.01 (adjoint method) | 0.03 (GPU) | 2.03 or 0.04 (GPU) |
