Noise and Restoration

Five questions. Choose one answer for each, then submit to see your score and explanations.

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1. Which explanation matches model the degradation before restoring?A. A relatively uniform region can help estimate noise spread, provided it really lacks meaningful detail.B. A degradation model separates blur, noise, and sampling assumptions before choosing a restoration method.C. Direct inversion amplifies frequencies where the blur response is small; Wiener filtering trades recovery against estimated noise.D. Restoration should be evaluated against held-out originals, known synthetic degradation, or task outcomes when possible.

2. Which explanation matches estimate noise from quiet regions?A. A relatively uniform region can help estimate noise spread, provided it really lacks meaningful detail.B. A degradation model separates blur, noise, and sampling assumptions before choosing a restoration method.C. Direct inversion amplifies frequencies where the blur response is small; Wiener filtering trades recovery against estimated noise.D. Restoration should be evaluated against held-out originals, known synthetic degradation, or task outcomes when possible.

3. Which explanation matches inverse and wiener filtering intuition?A. A degradation model separates blur, noise, and sampling assumptions before choosing a restoration method.B. A relatively uniform region can help estimate noise spread, provided it really lacks meaningful detail.C. Restoration should be evaluated against held-out originals, known synthetic degradation, or task outcomes when possible.D. Direct inversion amplifies frequencies where the blur response is small; Wiener filtering trades recovery against estimated noise.

4. For estimate noise from quiet regions, which result or action fits this practical case: A blank area of paper looks textured in a raw scan.A. Estimate whether camera motion or defocus better explains an edge trail.B. Compare both outputs on a moderately blurred, noisy image.C. Compare intensity variations in several quiet patches, not just one.D. Compare a restored scan with a reference and record both gains and invented-looking details.

5. For test restoration without invented detail, which result or action fits this practical case: The restored manuscript seems to contain letters no reader can verify.A. Estimate whether camera motion or defocus better explains an edge trail.B. Compare a restored scan with a reference and record both gains and invented-looking details.C. Compare intensity variations in several quiet patches, not just one.D. Compare both outputs on a moderately blurred, noisy image.

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Noise and Restoration

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