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[Grayscale] Boundary Detection Benchmark: Algorithm "Brightness Gradient"

This algorithm uses local brightness gradients to detect boundaries. A logistic is used to model the posterior probability of a boundary. The brightness gradient is computed as the chi-squared difference in the distribution of pixel luminance values in two half discs centered at a pixel and divided in half at the putative boundary orientation. See our NIPS and PAMI papers in the Grouping area of the Berkeley Vision Group web pages for additional details.

Click on an image for additional details.

#1 (119082) F=0.71
#2 (170057) F=0.68
#3 (58060) F=0.47
#4 (163085) F=0.46
#5 (42049) F=0.86
#6 (167062) F=0.77
#7 (157055) F=0.74
#8 (295087) F=0.64
#9 (24077) F=0.73
#10 (78004) F=0.77
#11 (220075) F=0.59
#12 (45096) F=0.72
#13 (38092) F=0.72
#14 (43074) F=0.68
#15 (16077) F=0.51
#16 (86000) F=0.68
#17 (101085) F=0.74
#18 (219090) F=0.65
#19 (89072) F=0.67
#20 (300091) F=0.76
#21 (126007) F=0.70
#22 (156065) F=0.58
#23 (76053) F=0.62
#24 (296007) F=0.60
#25 (175032) F=0.53
#26 (253027) F=0.68
#27 (304034) F=0.37
#28 (86016) F=0.46
#29 (103070) F=0.55
#30 (8023) F=0.30
#31 (260058) F=0.61
#32 (41033) F=0.66
#33 (291000) F=0.54
#34 (109053) F=0.57
#35 (130026) F=0.51
#36 (241004) F=0.78
#37 (108082) F=0.35
#38 (285079) F=0.69
#39 (147091) F=0.75
#40 (69040) F=0.48
#41 (14037) F=0.59
#42 (54082) F=0.54
#43 (189080) F=0.79
#44 (229036) F=0.70
#45 (62096) F=0.77
#46 (271035) F=0.71
#47 (167083) F=0.54
#48 (12084) F=0.51
#49 (69015) F=0.76
#50 (148089) F=0.69
#51 (160068) F=0.70
#52 (145086) F=0.69
#53 (216081) F=0.78
#54 (97033) F=0.67
#55 (182053) F=0.75
#56 (208001) F=0.63
#57 (19021) F=0.64
#58 (227092) F=0.84
#59 (134035) F=0.72
#60 (223061) F=0.56
#61 (253055) F=0.63
#62 (148026) F=0.53
#63 (210088) F=0.72
#64 (86068) F=0.60
#65 (3096) F=0.87
#66 (41069) F=0.68
#67 (21077) F=0.68
#68 (196073) F=0.72
#69 (108070) F=0.33
#70 (123074) F=0.50
#71 (376043) F=0.55
#72 (306005) F=0.66
#73 (38082) F=0.58
#74 (33039) F=0.58
#75 (108005) F=0.44
#76 (106024) F=0.68
#77 (302008) F=0.59
#78 (102061) F=0.55
#79 (197017) F=0.80
#80 (299086) F=0.71
#81 (37073) F=0.81
#82 (241048) F=0.68
#83 (65033) F=0.64
#84 (55073) F=0.56
#85 (66053) F=0.71
#86 (143090) F=0.68
#87 (85048) F=0.73
#88 (42012) F=0.54
#89 (351093) F=0.72
#90 (361010) F=0.72
#91 (175043) F=0.29
#92 (87046) F=0.51
#93 (105025) F=0.49
#94 (236037) F=0.34
#95 (101087) F=0.74
#96 (304074) F=0.61
#97 (296059) F=0.88
#98 (159008) F=0.58
#99 (385039) F=0.74
#100 (69020) F=0.65

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