A Tenprint Cards (“TwoInch” Data)

A.1 Bootstrap Confidence for Segmentation Statistics

This section shows the same detailed results of segmentation of TwoInch data from Section 2.3, but with an added bootstrap confidence interval. For each observation, a bootstrap routine with 1 000 replicates was run, and a 95 % confidence interval extracted. The lower and upper confidence from that confidence interval are printed in each column within square brackets.

In Table A.1, results are shown of how successful nec+0003 segmented fingers for each subject in the test corpus. Table A.2 shows success for specific finger positions over the entire test corpus. Similarly, Table A.3 shows success for segmenting the same finger position from both hands.

The remainder of the tables show success per subject when considering combinations of subsets of the fingers in each slap image. Table A.4 shows success for combinations of all fingers, Table A.6 for the all except the little finger, and Table A.5 for just the index and middle fingers.

Table A.1: For each subject, the percentage that at least Number of Fingers fingers were correctly segmented, regardless of hand, for a maximum of eight correctly-segmented fingers. In Standard Scoring, scoring rules are followed exactly. In Ignoring Bottom Y, the bottom left and bottom right Y coordinates are ignored. Ignoring Bottom X and Y only checks the locations of the top left and top right coordinates. Values in square brackets represent a 95 % confidence interval after bootstrapping with 1 000 replicates.
Number of Fingers Standard Scoring Ignoring Bottom Y Ignoring Bottom X and Y
1 99.8 [99.7, 99.8] 99.8 [99.7, 99.8] 99.8 [99.8, 99.9]
2 99.3 [99.2, 99.5] 99.4 [99.2, 99.5] 99.6 [99.5, 99.7]
3 98.6 [98.4, 98.8] 98.7 [98.5, 98.9] 99.1 [98.9, 99.3]
4 96.3 [95.9, 96.6] 96.5 [96.1, 96.7] 97.3 [97.0, 97.6]
5 92.3 [91.8, 92.7] 92.5 [92.0, 92.9] 93.5 [93.1, 93.9]
6 88.6 [88.0, 89.1] 89.0 [88.4, 89.6] 90.7 [90.2, 91.2]
7 78.2 [77.5, 78.9] 79.2 [78.4, 79.9] 81.7 [81.1, 82.4]
8 46.6 [45.7, 47.4] 47.7 [46.8, 48.7] 50.7 [49.8, 51.6]
Table A.2: For all subjects, Percentage that a particular friction ridge generalized position was correctly segmented. In Ignoring Bottom Y, the bottom left and bottom right Y coordinates are ignored. Ignoring Bottom X and Y only checks the locations of the top left and top right coordinates. Values in square brackets represent a 95 % confidence interval after bootstrapping with 1 000 replicates.
Finger Standard Scoring Ignoring Bottom Y Ignoring Bottom X and Y
Right
Index 93.2 [92.8, 93.5] 93.7 [93.4, 94.0] 94.6 [94.3, 94.9]
Middle 95.0 [94.7, 95.2] 95.3 [95.0, 95.6] 95.8 [95.5, 96.0]
Ring 95.8 [95.6, 96.1] 96.3 [96.1, 96.5] 97.4 [97.2, 97.6]
Little 85.3 [84.8, 85.8] 85.9 [85.5, 86.4] 88.0 [87.5, 88.4]
Left
Index 92.8 [92.4, 93.1] 93.0 [92.7, 93.4] 93.8 [93.4, 94.1]
Middle 93.7 [93.4, 94.0] 94.0 [93.7, 94.3] 94.6 [94.3, 94.9]
Ring 95.7 [95.4, 96.0] 96.2 [95.9, 96.4] 96.9 [96.6, 97.1]
Little 65.5 [64.8, 66.1] 65.8 [65.2, 66.5] 68.8 [68.2, 69.5]
Table A.3: Percentage that a particular type of fingerprint was correctly segmented on Either or Both hands. In Ignoring Bottom Y, the bottom left and bottom right Y coordinates are ignored. Ignoring Bottom X and Y only checks the locations of the top left and top right coordinates. Values in square brackets represent a 95 % confidence interval after bootstrapping with 1 000 replicates.
Fingers Standard Scoring Ignoring Bottom Y Ignoring Bottom X and Y
Index
Either 98.0 [97.7, 98.2] 98.0 [97.8, 98.3] 98.4 [98.2, 98.7]
Both 83.7 [83.0, 84.3] 84.3 [83.7, 84.9] 85.6 [85.0, 86.2]
Middle
Either 98.0 [97.8, 98.3] 98.1 [97.9, 98.3] 98.5 [98.3, 98.7]
Both 86.4 [85.9, 87.0] 86.9 [86.4, 87.5] 87.6 [87.1, 88.2]
Ring
Either 98.7 [98.5, 98.9] 98.9 [98.7, 99.1] 99.3 [99.1, 99.4]
Both 88.9 [88.3, 89.4] 89.6 [89.1, 90.1] 91.1 [90.5, 91.6]
Little
Either 91.5 [91.1, 92.0] 91.8 [91.4, 92.3] 93.6 [93.2, 94.0]
Both 54.3 [53.5, 55.2] 54.9 [54.0, 55.8] 58.4 [57.5, 59.2]
Table A.4: Percentage of segmentation success by hand for combinations of all eight fingers of a TwoInch slap. In Ignoring Bottom Y, the bottom left and bottom right Y coordinates are ignored. Ignoring Bottom X and Y only checks the locations of the top left and top right coordinates. Values in square brackets represent a 95 % confidence interval after bootstrapping with 1 000 replicates.
Fingers Standard Scoring Ignoring Bottom Y Ignoring Bottom X and Y
Right
Any 99.1 [99.1, 99.3] 99.1 [99.2, 99.3] 99.5 [99.4, 99.6]
At Least Two 97.5 [97.4, 97.7] 97.6 [97.5, 97.8] 98.5 [98.3, 98.5]
At Least Three 94.0 [92.9, 93.4] 94.3 [93.2, 93.7] 95.4 [94.4, 94.9]
All Four 78.7 [68.9, 69.8] 80.2 [70.0, 70.9] 82.4 [72.6, 73.5]
Left
Any 99.3 [99.1, 99.3] 99.4 [99.2, 99.3] 99.6 [99.4, 99.6]
At Least Two 97.6 [97.4, 97.7] 97.8 [97.5, 97.8] 98.3 [98.3, 98.5]
At Least Three 92.1 [92.9, 93.4] 92.5 [93.2, 93.7] 93.8 [94.4, 94.9]
All Four 58.6 [68.9, 69.8] 59.4 [70.0, 70.9] 62.3 [72.6, 73.5]
Table A.5: Percentage of segmentation success by hand when only considering combinations of index and middle fingers. In Ignoring Bottom Y, the bottom left and bottom right Y coordinates are ignored. Ignoring Bottom X and Y only checks the locations of the top left and top right coordinates. Values in square brackets represent a 95 % confidence interval after bootstrapping with 1 000 replicates.
Fingers Standard Scoring Ignoring Bottom Y Ignoring Bottom X and Y
Right
Either Index or Middle 97.1 [96.6, 96.9] 97.2 [96.6, 97.0] 97.6 [97.1, 97.4]
Both Index and Middle 91.0 [90.3, 90.9] 91.8 [91.0, 91.5] 92.8 [91.9, 92.4]
Left
Either Index or Middle 96.3 [96.6, 96.9] 96.3 [96.6, 97.0] 96.8 [97.1, 97.4]
Both Index and Middle 90.2 [90.3, 90.9] 90.7 [91.0, 91.5] 91.5 [91.9, 92.4]
Table A.6: Percentage of segmentation success by hand when only considering combinations of index, middle, and ring fingers. In Ignoring Bottom Y, the bottom left and bottom right Y coordinates are ignored. Ignoring Bottom X and Y only checks the locations of the top left and top right coordinates. Values in square brackets represent a 95 % confidence interval after bootstrapping with 1 000 replicates.
Fingers Standard Scoring Ignoring Bottom Y Ignoring Bottom X and Y
Right
Any 98.5 [98.6, 98.8] 98.6 [98.6, 98.8] 99.2 [99.2, 99.3]
At Least Two 96.4 [95.8, 96.1] 96.5 [95.9, 96.3] 97.2 [96.6, 97.0]
All Three 89.1 [88.2, 88.8] 90.2 [89.1, 89.7] 91.4 [90.2, 90.8]
Left
Any 98.9 [98.6, 98.8] 99.0 [98.6, 98.8] 99.3 [99.2, 99.3]
At Least Two 95.5 [95.8, 96.1] 95.7 [95.9, 96.3] 96.3 [96.6, 97.0]
All Three 87.8 [88.2, 88.8] 88.5 [89.1, 89.7] 89.6 [90.2, 90.8]

A.2 Jaccard Index

Boxplot of Jaccard similarity indices as compared to the traditional success metrics. Outliers have been removed for clarity.

Figure A.1: Boxplot of Jaccard similarity indices as compared to the traditional success metrics. Outliers have been removed for clarity.

Boxplot of Jaccard similarity indices for each friction ridge generalized position. Outliers have been removed for clarity.

Figure A.2: Boxplot of Jaccard similarity indices for each friction ridge generalized position. Outliers have been removed for clarity.

Table A.7: For each subject, the percentage that at least Number of Fingers fingers were segmented with a Jaccard index in the indicated range.
Number of Fingers ≥0.5 ≥0.6 ≥0.7 ≥0.8 ≥0.9 ≥0.95 ≥0.98
1 99.9 99.9 99.9 99.3 76.0 7.0 0.1
2 99.9 99.9 99.6 98.2 47.2 0.4 0
3 99.8 99.7 99.2 96.1 23.3 0.0 0
4 99.5 99.1 97.9 91.8 8.8 0 0
5 95.5 95.1 93.9 86.0 2.2 0 0
6 94.9 94.0 91.9 77.5 0.4 0 0
7 92.3 91.2 87.4 59.0 0.0 0 0
8 89.8 86.4 73.6 25.0 0 0 0
Table A.8: For all subjects, percentage that a particular friction ridge generalized position was segmented with a Jaccard index in the indicated range.
Finger 0-0.5 0.5-0.6 0.6-0.7 0.7-0.8 0.8-0.9 0.9-1.0
Right
Index 2.0 0.4 1.5 11.2 65.2 19.7
Middle 1.6 0.5 1.3 7.9 64.3 24.4
Ring 0.4 0.5 1.2 6.4 54.9 36.6
Little 0.6 0.6 2.5 19.5 70.9 5.9
Left
Index 3.3 0.7 1.4 8.2 59.0 27.4
Middle 2.2 1.0 2.1 9.2 57.2 28.3
Ring 0.3 0.4 1.5 8.8 70.7 18.3
Little 0.9 1.7 8.6 42.7 45.5 0.6
Table A.9: Percentage of segmentation obtaining a Jaccard index in the indicated ranges, by hand, for combinations of all eight fingers of a TwoInch slap.
Fingers ≥0.5 ≥0.6 ≥0.7 ≥0.8 ≥0.9 ≥0.95 ≥0.98
Right
Any 99.9 99.8 99.5 98.0 58.4 4.1 0.0
At Least Two 99.7 99.3 98.6 94.8 23.0 0.1 0.0
At Least Three 98.4 97.9 97.0 87.3 4.8 0.0 0.0
All Four 97.4 96.4 91.9 61.7 0.3 0.0 0.0
Left
Any 100.0 99.9 99.7 97.6 53.5 3.4 0.0
At Least Two 99.8 99.5 98.5 92.9 18.3 0.1 0.0
At Least Three 97.8 97.1 95.5 80.5 2.8 0.0 0.0
All Four 95.7 93.0 82.2 35.9 0.0 0.0 0.0
Table A.10: Percentage of segmentation obtaining a Jaccard index in the indicated ranges, by hand, for combinations of index and middle fingers of a TwoInch slap.
Fingers ≥0.5 ≥0.6 ≥0.7 ≥0.8 ≥0.9 ≥0.95 ≥0.98
Right
Either Index or Middle 98.5 98.2 97.7 94.9 37.8 1.7 0.0
Both Index and Middle 97.8 97.3 95.0 78.7 6.3 0.0 0
Left
Either Index or Middle 98.0 97.4 96.7 93.7 45.7 2.8 0.0
Both Index and Middle 96.5 95.5 92.7 78.3 10.1 0.0 0
Table A.11: Percentage of segmentation obtaining a Jaccard index in the indicated ranges, by hand, for combinations of index, middle, and ring fingers of a TwoInch slap.
Fingers ≥0.5 ≥0.6 ≥0.7 ≥0.8 ≥0.9 ≥0.95 ≥0.98
Right
Any 99.8 99.4 98.9 97.2 56.6 4.0 0.0
At Least Two 98.5 98.1 97.5 92.5 20.5 0.1 0
All Three 97.7 97.0 94.3 75.3 3.5 0.0 0
Left
Any 99.9 99.7 99.1 96.8 53.2 3.4 0.0
At Least Two 98.0 97.3 96.3 90.9 18.1 0.1 0
All Three 96.4 95.2 91.8 73.3 2.7 0 0