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Table 4 Results of the three comparison methods in image tests under variable illumination

From: Automated optical inspection system for digital TV sets

Results of image tests--variable illumination
Number Test LAE NCC NCC-BB
1 Correct image 1657.58 473.74 84.16
2 Similar image 1 1722.57 348.17 84.04
3 Similar image 2 1724.35 348.17 84.04
4 Different image 1972.48 272.48 108.86
5 Constant black 1691.07 2.53 77.93
6 Constant white 1696.50 - 2.50 77.26
  1. This table summarizes the results for LAE, NCC and NCC-BB comparison methods in image tests under variable illumination. NCC method showed the best vulnerability to these artificial and easily avoidable conditions in test environments. NCC-BB failed to detect the correct image because of its block-based properties--part where illumination is different dominated.