Fig. 9
From: Robust surface normal estimation via greedy sparse regression
Angular error of normal maps recovered using various methods (a–c). Red horizontal lines indicate medians. Upper and lower border of the blue boxes represent third (Q3) and first quartile (Q1), respectively. Upper and lower whiskers show 1.0 interquartile range (the difference between the upper and lower quartiles, the IQR) extended from Q3 and Q1, respectively. The whiskers show the quantile Q1 and Q3 extended by 1.0 IQR (as opposed to the typically shown 1.5 IQR)