Super resolution, classical
[](https://www.python.org/)
Result
| Sr | Scene | Nearest | Bilinear | Bicubic | Lanczos-4 | Edge-dir. | **Back-proj.** | Reference |
|---|---|---|---|---|---|---|---|---|
| 1 | hawk in scrub · high-freq 39.0% | 29.8 | 30.4 | 30.8 | 30.8 | 30.8 | **34.6** | 34.2 |
| 2 | rider and herd · high-freq 48.1% | 20.4 | 20.7 | 20.9 | 21.0 | 20.9 | **23.5** | 23.8 |
| 3 | longtail boats · high-freq 54.7% | 23.5 | 23.8 | 23.9 | 24.0 | 23.9 | **25.8** | 26.3 |
| 4 | parasols and willows · high-freq 60.0% | 20.8 | 21.0 | 21.1 | 21.1 | 21.1 | **22.3** | 22.6 |
The finding
One scanline says it better than the table
The truth (dashed) swings between 36 and 243 across four pixels. Every method draws a smooth line through the middle of it. Nearest visibly steps and the rest ramp — that difference is the 0.49 dB — but next to the original they are the same curve.
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Figures
Elsewhere
Code and full results on GitHub (code private)
Every number is read from the file the run produced. github.com/hammasbuilds · kaggle.com/muhammadhammas13