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Table 2 Distance values of the matching process between 10 thumbnails (query images) and their corresponding visually protected images. The thumbnail size was 200 × 200 pixels

From: A secure online image trading system for untrusted cloud environments

  Thumbnails (queries)
Image 1 Image 2 Image 3 Image 4 Image 5 Image 6 Image 7 Image 8 Image 9 Image 10
Visually protected images
Image 1 61.5043 17.1736 35.4991 58.3845 24.3850 34.1974 16.8766 9.6885 40.4713 6.1305
Image 2 73.7492 28.0326 59.4003 47.3329 43.9759 87.7005 40.2979 13.3583 48.8846 8.0870
Image 3 52.0151 27.3603 37.5624 43.0131 43.3199 54.9353 27.2397 8.5423 38.8602 3.1863
Image 4 50.3825 28.9227 37.8932 44.1265 36.5985 51.9405 24.1728 6.8419 43.6390 13.5317
Image 5 73.5381 38.7909 48.0761 60.4244 51.4285 73.3088 35.5317 15.2689 59.8085 19.8409
Image 6 43.2402 32.3024 30.7378 43.4939 18.9351 40.6727 16.9871 14.1854 37.9260 9.3787
Image 7 70.5254 37.1785 48.5439 45.5184 36.7016 60.7536 36.9330 19.5183 58.4514 18.9622
Image 8 83.9371 58.4279 71.4194 83.1694 59.6877 79.7380 51.4882 31.0528 71.7856 46.3062
Image 9 47.7183 24.7508 47.6969 36.3379 26.7633 45.0160 15.7848 6.5863 53.1393 7.2226
Image 10 107.0481 57.1520 82.9739 81.9254 74.0595 89.6267 52.5808 41.8910 85.5333 42.6746