Fig. 3
From: Robust surface normal estimation via greedy sparse regression
Outliers identified by orthogonal matching pursuit. a Outliers with great non-Lambertian error (red circles) detected in iterations 4–10. b Outliers with medium to great error (red circles) detected in iterations 4–18. c All outliers (red circles) detected as of iteration 28. Blue dotted lines show actual luminance observations in all three plots