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Table 1 Distance values of the matching process between 10 thumbnails (query images) and their corresponding visually protected images. The thumbnail size was 64 × 64 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 39.7189 13.7239 32.6606 39.1072 16.0546 38.3149 26.1712 24.3939 32.9669 13.0074
Image 2 74.6377 39.1847 45.9280 42.6521 51.1529 47.1137 42.1569 11.2891 55.4061 29.9876
Image 3 46.0236 21.9212 25.3841 45.8017 35.9153 30.9343 21.1973 5.6480 51.804 3.9774
Image 4 51.8784 23.7847 47.4008 56.1663 28.6371 46.6445 14.9005 6.4785 50.0290 12.3105
Image 5 81.8966 34.1338 77.5687 54.1198 55.4902 68.1009 43.1274 16.1991 52.1721 26.5318
Image 6 46.7303 22.7267 36.2143 49.1851 17.6216 46.8785 29.0792 9.9819 36.8837 5.2726
Image 7 72.3930 45.8260 65.1096 52.7709 48.9887 60.1583 36.2682 12.3805 71.6876 7.0817
Image 8 98.7694 49.9285 84.5833 76.0566 58.5684 85.4906 47.4281 45.9970 79.7815 31.1651
Image 9 59.3159 23.1605 35.8060 50.8272 32.1720 51.2894 26.2252 6.8737 46.0803 5.6870
Image 10 77.8870 62.6029 66.7996 71.1085 71.4843 88.5928 59.5243 49.7886 73.1289 36.0710