2 Timing Sample Dataset

A fixed sample of images randomly selected from the PFT III datasets are used to assess whether or not an implementation adheres to the minimum timing requirements set forth in the PFT III test plan. This sample is also used to provide an estimate on template size. The images and comparisons are identical to the “1K Sample Evaluation” from NIST’s PFT II evaluation, with the exception of the “IARPA N2N” dataset, which is new in PFT III. Table 2.1 shows information about the maximum dimensions and resolutions of the images in each of the timing sample datasets.

Table 2.1: Maximum dimensions in pixels and capture resolution in pixels per inch (PPI) for the images in each of the subsets comprising the timing sample dataset.
AZ LA County DHS 2 POE+BVA IARPA N2N
Max Dimensions (pixels) 800 x 800 412 x 1 000 368 x 368 500 x 500 1 600 x 1 500
Resolution (PPI) 500 500 500 500 1 000

2.1 Template Size

Figure 2.1 and Table 2.2 show the distribution of file sizes of templates. Failures of any kind reported during template generation result in NIST code writing 0 byte files. These files are excluded from the template size analysis in this section.

Box plots of template sizes in bytes of templates created from a fixed sample of data from the PFT III evaluation. An overall plot is shown, as well as individual plots per data origin. Tabular versions of this data are shown in Table 2.2.

Figure 2.1: Box plots of template sizes in bytes of templates created from a fixed sample of data from the PFT III evaluation. An overall plot is shown, as well as individual plots per data origin. Tabular versions of this data are shown in Table 2.2.

Table 2.2: Sizes in bytes of templates created from a fixed sample of data from the PFT III evaluation. The bottom row, Failures, shows the number of failures to create a template, which are not included in these statistics. Box plots of this data are shown in Figure 2.1.
Overall AZ LA County DHS 2 POE+BVA IARPA N2N
Min 1 224 1 224 2 424 4 599 1 299 14 274
25 % 24 699 58 224 40 149 21 099 20 124 45 474
Median 37 374 66 474 46 374 24 699 23 574 55 899
Mean 42 067 67 106 46 914 24 851 24 041 58 151
75 % 57 174 75 624 53 292 28 317 27 624 68 274
Max 115 899 115 899 95 649 49 299 50 949 115 524
Failures 0 0 0 0 0 0

2.2 Template Creation Time

Figure 2.2 and Table 2.3 show the distribution of durations of time consumed when creating templates. Failures of all kinds are incorporated into these statistics, since this time would be observed by the end user of a template creation algorithm.

Times are measured by running a single process on an isolated compute node equipped with an Intel Xeon Gold 6254 CPU.

Box plots of elapsed milliseconds when creating templates from a fixed sample of data from the PFT III evaluation. All times are used, even if a failure occurred. Tabular versions of this data are shown in Table 2.3.

Figure 2.2: Box plots of elapsed milliseconds when creating templates from a fixed sample of data from the PFT III evaluation. All times are used, even if a failure occurred. Tabular versions of this data are shown in Table 2.3.

Table 2.3: Elapsed milliseconds when creating templates from a fixed sample of data from the PFT III evaluation. All times are used, even if a failure occurred. The bottom row, Failures, shows the number of failures to generate a template. Failures are included in these statistics. Box plots of this data are shown in Figure 2.2.
Overall AZ LA County DHS 2 POE+BVA IARPA N2N
Min 123.1 189.2 123.1 154.0 130.8 244.9
25 % 208.3 460.3 345.7 195.5 177.7 410.1
Median 324.7 519.5 389.2 205.2 205.8 488.3
Mean 346.2 530.3 388.2 205.7 206.2 509.2
75 % 458.4 591.0 429.9 217.5 225.7 591.8
Max 1 130.2 957.4 948.6 596.3 707.2 1 130.2
Failures 0 0 0 0 0 0

2.3 Template Comparison Time

Figure 2.3 and Table 2.4 show the distribution of durations of time consumed when comparing templates. Failures of any kind are incorporated into these statistics, since this time would be observed by the end user of a template comparison algorithm.

Times are measured by running a single process on an isolated compute node equipped with an Intel Xeon Gold 6254 CPU.

Box plots of elapsed microseconds when comparing two templates from a fixed sample of data from the PFT III evaluation. All times are used, even if a failure occurred. Tabular versions of this data are shown in Table 2.4.

Figure 2.3: Box plots of elapsed microseconds when comparing two templates from a fixed sample of data from the PFT III evaluation. All times are used, even if a failure occurred. Tabular versions of this data are shown in Table 2.4.

Table 2.4: Elapsed microseconds when comparing two templates from a fixed sample of data from the PFT III evaluation. The bottom row, Failures, shows the number of failures to compare. Failures are included in these statistics. Box plots of this data are shown in Figure 2.4.
Overall AZ LA County DHS 2 POE+BVA IARPA N2N
Min 120.4 412.7 1 970.6 915.5 120.4 2 113.8
25 % 2 697.7 5 345.5 3 552.2 1 912.7 1 601.3 4 411.2
Median 4 095.6 6 748.4 4 231.2 2 811.8 2 203.3 5 718.7
Mean 5 177.9 7 892.0 5 256.9 3 721.3 2 538.2 6 502.2
75 % 6 190.9 8 980.1 5 635.9 3 538.7 2 562.4 7 359.7
Max 1 313 636.6 686 279.6 655 520.6 1 313 636.6 638 673.4 644 088.2
Failures 0 0 0 0 0 0