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 1 118 10 694 1 118 1 384 1 118 9 364
25 % 14 418 27 186 23 994 12 290 12 024 27 186
Median 22 398 28 782 27 186 14 418 14 152 27 186
Mean 21 874 30 714 25 763 14 448 14 284 28 732
75 % 27 186 33 304 27 186 16 812 16 280 29 314
Max 68 416 54 052 45 274 26 920 27 186 68 416
Failures 2 0 1 1 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 115.1 340.1 159.3 115.1 127.4 308.6
25 % 260.0 509.0 418.1 232.0 230.3 486.6
Median 398.7 526.6 439.1 254.8 257.1 490.0
Mean 384.7 545.5 435.4 255.5 261.7 506.3
75 % 505.2 571.1 462.4 279.8 289.6 513.5
Max 1 063.8 789.2 635.3 388.7 426.8 1 063.8
Failures 2 0 1 1 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 0.5 412.9 0.5 0.9 116.0 297.0
25 % 650.9 697.2 858.4 561.6 509.6 756.7
Median 959.1 1 111.8 1 201.4 755.2 713.8 944.0
Mean 1 087.9 1 241.2 1 352.9 909.5 908.1 1 026.7
75 % 1 373.8 1 514.5 1 737.4 1 232.5 1 305.9 1 198.2
Max 12 473.0 12 473.0 6 904.9 3 233.5 6 012.2 5 436.7
Failures 0 0 0 0 0 0