5 FBI Laboratory

The results of Section 5 are based on searches of the sequestered dataset FBI Laboratory. This dataset consists of 49 operational latent distal phalanx probes. Examiners at the FBI annotated several of the probe images with EFS features, possibly with algorithm assistance. These examiners then confirmed the ground truth mate. All probes searched were a single sample depicting a region from a distal phalanx. EFS data provided with the probe image may include:

  • Pattern classification
  • Minutia locations (unconfirmed source)

5.1 Failures

Table 5.1 shows the number of failures to create templates. Table 5.2 shows the number of failures to produce a candidate list.

Table 5.1: Number of failures to create templates.
Image Type Content Failures Attempts
Exemplar Image 0 38
Probe EFS 0 48
Probe Image 0 49
Probe Image + EFS 0 49
Table 5.2: Number of failures to produce a candidate list. This number includes any failures to create a probe template from Table 5.1.
Probe Content Failures Attempts
EFS 0 48
Image 0 49
Image + EFS 0 49

5.2 CMC

5.2.1 Plots

5.2.1.1 All Probes

The CMC plots in Figure 5.1 show the FNIR of idemia+0002 when searching FBI Laboratory against enrollment database where a single mated identity for each search probe was present. The plots are faceted by whether probe EFS data was provided. Tabular versions of FNIR at select ranks can be viewed in Table 5.3.

CMC when searching FBI Laboratory probes, faceted by whether probe EFS data was provided.

Figure 5.1: CMC when searching FBI Laboratory probes, faceted by whether probe EFS data was provided.

5.2.1.2 Probes with EFS Data

Not all of the probes in the FBI Laboratory dataset contain EFS data. The plot in Figure 5.2 shows the CMC over only the probes that contained EFS data. This plot also differs from Figure 5.1 with the inclusion of a line for probes where no image was provided when creating the probe template, meaning the only information available was EFS data. Only the region success location is shown.

CMC of region location when searching only the FBI Laboratory probes that contained EFS data.

Figure 5.2: CMC of region location when searching only the FBI Laboratory probes that contained EFS data.

5.2.2 FNIR at Select Rank

5.2.2.1 All Probes

The values in Table 5.3 correspond to Figure 5.1.

Table 5.3: Region FNIR values from CMC plotted in Figure 5.1.
Probe Content Rank 1 Rank  ≤ 2 Rank  ≤ 5 Rank  ≤ 10 Rank  ≤ 50 Rank  ≤ 100
Image 0.102 0.0612 0.0408 0.0408 0.0204 0.0204
Image + EFS 0.102 0.0408 0.0408 0.0204 0.0204 0.0204

5.2.2.2 Probes with EFS Data

The values in Table 5.4 correspond to Figure 5.2.

Table 5.4: Region FNIR values from CMC plotted in Figure 5.2.
Probe Content Rank 1 Rank  ≤ 2 Rank  ≤ 5 Rank  ≤ 10 Rank  ≤ 50 Rank  ≤ 100
EFS 0.3750 0.3333 0.3333 0.2917 0.2292 0.2292
Image 0.1042 0.0625 0.0417 0.0417 0.0208 0.0208
Image + EFS 0.1042 0.0417 0.0417 0.0208 0.0208 0.0208

5.3 DET

5.3.1 Plots

5.3.1.1 All Probes

The DET plots in Figure 5.3 show the false positive and false negative identification rate tradeoffs of idemia+0002 when searching FBI Laboratory against enrollment database where a single mated identity for each search probe was present. The plots are faceted by whether probe EFS data was provided. Tabular versions of FNIR at select FPIR can be viewed in Table 5.5. Annotated values indicate similarity scores, which are tabulated in Table 5.7.

DET when searching FBI Laboratory probes, faceted by whether probe EFS data was provided. Annotated values indicate similarity scores.

Figure 5.3: DET when searching FBI Laboratory probes, faceted by whether probe EFS data was provided. Annotated values indicate similarity scores.

5.3.1.2 Probes with EFS Data

Not all of the probes in the FBI Laboratory dataset contain EFS data. The plot in Figure 5.4 shows the DET over only the probes that contained EFS data. This plot also differs from Figure 5.3 with the inclusion of a line for probes where no image was provided when creating the probe template, meaning the only information available was EFS data. Only the region success location is shown.

DET of region location when searching only the FBI Laboratory probes that contained EFS data.

Figure 5.4: DET of region location when searching only the FBI Laboratory probes that contained EFS data.

5.3.2 FNIR at Select FPIR

5.3.2.1 All Probes

The values in Table 5.5 correspond to Figure 5.3.

Table 5.5: Region FNIR values corresponding to FPIR plotted in Figure 5.3.
Probe Content FPIR = 0.01 FPIR = 0.02 FPIR = 0.1
Image 0.0816 0.0816 0.0612
Image + EFS 0.0816 0.0816 0.0612

5.3.2.2 Probes with EFS Data

The values in Table 5.6 correspond to Figure 5.4.

Table 5.6: Region FNIR values corresponding to FPIR plotted in Figure 5.4.
Probe Content FPIR = 0.01 FPIR = 0.02 FPIR = 0.1
EFS 0.6042 0.6042 0.5417
Image 0.0816 0.0816 0.0612
Image + EFS 0.0816 0.0816 0.0612

5.3.3 Similarity Score Thresholds at Select FPIR

The values in Table 5.7 correspond to similarity score thresholds observed at the select FPIR values from Table 5.5.

Table 5.7: Similarity score thresholds corresponding to select FPIR values from Table 5.5.
Probe Content FPIR = 0.01 FPIR = 0.02 FPIR = 0.1
Image 6 355.61 6 355.61 5 686.92
Image + EFS 6 449.43 6 449.43 5 758.24