Table 3 Image quality test requirements [40] and experiment results
From: A parallel camera image signal processor for SIMD architecture
Metric | MTF30 | Over-sharpening | Edge roughness |
|---|---|---|---|
Requirements (20 lx) | 0.33~0.8 | ≤20 % |  |
Requirements (200 lx) | 0.35~0.7 | ≤20 % | ≤0.15 pixel |
The proposed ISP (20 lx) | 0.335~0.512 | 0 % | – |
The proposed ISP (200Â lx) | 0.448~0.568 | 0Â % | 0.058Â pixel |
Metric | Texture acuity | Exposure error | Gamma |
Requirements (20 lx) | ≥0.65 | −1.2~0.5 | 0.4~0.9 |
Requirements (200 lx) | ≥0.65 | −0.5~0.5 | 0.4~0.7 |
The proposed ISP (20 lx) | 0.886 | −1.2 | 0.425 |
The proposed ISP (200 lx) | 0.880 | −0.34 | 0.488 |
Metric | SNR | DR | Light falloff |
Requirements (20 lx) | ≥30 dB | ≥33 dB |  |
Requirements (200 lx) | ≥30 dB | ≥33 dB | 70 % ≤ RI ≤ 130 % |
The proposed ISP (20Â lx) | 34.1Â dB | 44Â dB | Â |
The proposed ISP (200Â lx) | 42.0Â dB | 44Â dB | 76.6Â % |
Metric | Color uniformity | SMIA | |
Requirements (20Â lx) | Â | Â | |
Requirements (200 lx) | Max ∆C ≤ 10 | |SMIA| < 6 % | |
The proposed ISP (20Â lx) | Â | Â | |
The proposed ISP (200 lx) | 3.06 | −2.83 | |
Metric | Delta C00 | ||
2900Â K | 3500Â K | 5500Â K | |
Requirements (20 lx) | Mean ≤ 15 Max ≤ 20 | Mean ≤ 10 Max ≤ 15 |  |
Requirements (200 lx) |  | Mean ≤ 10 Max ≤ 15 | Mean ≤ 10 Max ≤ 15 |
The proposed ISP (20 lx) | Mean = 8.35 Max = 13.6 | Mean = 6.91 Max = 15.0 |  |
The proposed ISP (200 lx) |  | Mean = 6.45 Max = 11.7 | Mean = 6.33 Max = 11.0 |