FRIF TE Quality functionality. More...

Classes
class	VerboseQuality
	Detailed quality information for a sample. More...
class	Interface
	Interface for quality calculation implemented by participant. More...

Enumerations
enum class	Component { Amputated , AnatomicalCluesPresent , Bandaged , ClearCoreDeltaRidgeCount , ComplexMatrix , ComplexSubstrate , CompressedRidges , Condensation , CorePresent , DeltaPresent , DevelopmentArtifacts , DistinctiveClusterPresent , EvenPressure , EvidenceOfFraud , ExcessiveDistortion , ExtremeTip , FocalPointsPresent , Ghosting , IsolatedRidgeClusters , Level3Present , MinutiaePresent , Movement , MultipleNonOverlappingImpressions , MultipleOverlappingImpressions , NumHighConfidenceMinutiae , NumMinutiae , OpenField , OrientationCertaintyLevel , OrientationClue , PatternClassification , PatternForceMinutiae , RidgeColorUncertain , RidgeFlowContinuity , RidgeValleyClarity , RidgeValleyUniformity , SpatialSamplingRatePPI , SpottyRidges , TonalReversal , WetRidges }
	Quality components. More...

Functions
LibraryIdentifier	getLibraryIdentifier ()

Variables
uint16_t	API_MAJOR_VERSION {0}
	API major version number.
uint16_t	API_MINOR_VERSION {0}
	API minor version number.
uint16_t	API_PATCH_VERSION {1}
	API patch version number.

Detailed Description

FRIF TE Quality functionality.

Enumeration Type Documentation

◆ Component

enum class FRIF::Evaluations::Quality::Component

strong

Quality components.

Note: All images sourced from NIST Special Databases 300, 301, and 302.; Some components and component descriptions are based on work by Heidi Eldridge and Christophe Champod for Irregular Warfare Technical Support Directorate Task Number FE-TE-4766.

Enumerator
Amputated	Evidence of finger amputation. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. Note Algorithms should detect information such as an obstructed pattern or only flat ridges when curved ridges are expected. Algorithms should not necessarily recognize the letters "AMP" that are often typed or handwritten on a fingerprint card to indicate amputation.
AnatomicalCluesPresent	Presence of a feature that indicates the anatomical source. An "egg" shape might indicate a thumb, or a series of deltas might indicate an interdigital palm area. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block.
Bandaged	Evidence of full or partial bandage. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. Bandage on the right of the fingerprint
ClearCoreDeltaRidgeCount	Confidence that the computed core-delta ridge count is within two ridges of the true value. This implies clear and unobstructed ridge flow between the core and delta. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. See also CorePresent DeltaPresent PatternClassification Clarity of ridges between core and delta.
ComplexMatrix	The matrix makes the impression difficult to interpret. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. See also ComplexSubstrate
ComplexSubstrate	The substrate (e.g., pattern, texture) makes the impression difficult to interpret. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. Substrate pattern makes ridges hard to see. See also ComplexMatrix
CompressedRidges	Ridges appear wider than normal and potentially overlap, limiting the area of the valleys between. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. See also EvenPressure RidgeValleyClarity Large area of compressed ridges.
Condensation	Presence of condensation. Primarily present in exemplar impression images. Often referred to as a "halo," as in a halo of condensation around a finger. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block.
CorePresent	One or more cores are present or implied. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. See also PatternClassification Image with core present. Image with core implied.
DeltaPresent	One or more deltas are present or implied. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. Image with delta present.
DevelopmentArtifacts	Artifacts introduced in development of the impression have caused damage. Examples include brush strokes, tape, labels, specular reflection, and image compression. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. Tape bubble artifacts affect interpretation of the mark. Photograph is out of focus.
DistinctiveClusterPresent	Presence of areas with unique clusters of minutiae. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. A distinctive cluster of minutiae northwest of the core.
EvenPressure	Friction ridges are deposited with an even pressure. This implies a consistent grey level of ridges across the image. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. See also CompressedRidges RidgeValleyClarity Image depicting even pressure. Image depicting uneven pressure in the fingerprint core.
EvidenceOfFraud	Evidence that impression has been placed by artificial means. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. Note This is not intended to be a full presentation attack detection system (though it could be), more that the impression was not left by a natural touch on the substrate.
ExcessiveDistortion	Evidence of excessive distortion. All impressions will have some distortion. This quality component should be selected if the print contains so much distortion that it impacts the overall interpretation of the impression. This is typically due to movement of some kind that affects the shape of the impression. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. Major movement causing ridge compression and directional inconsistency.
ExtremeTip	Extreme tips or other regions not typically imaged in an exemplar impression. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. See also AnatomicalCluesPresent An image of an extreme tip that is likely not present in an exemplar.
FocalPointsPresent	Distinctive features other than cores or deltas are present. Features may include scars, warts, or creases, amongst others. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. Scarring and wart provide a distinct focal point.
Ghosting	Evidence of non-primary impression in image. Primarily present for exemplar images due to residue remaining on platen. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. Image with "ghost" of previous impression.
IsolatedRidgeClusters	Significant portion of mark is not connected to other portions. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. Two segmented areas of the same fingerprint.
Level3Present	Pores, incipient ridges, and/or edge shapes are clear. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. See also MinutiaePresent Image with pores present.
MinutiaePresent	Ridge endings and bifurcations are present or implied. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. See also Level3Present Image with minutiae present.
Movement	Twists, pulls, slips, and other movement is present. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. Ridges are smeared, depicting motion.
MultipleNonOverlappingImpressions	Multiple impressions in ROI that do not overlap. Typically fixed by better segmentation. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. See also MultipleOverlappingImpressions Two impressions that do not overlap.
MultipleOverlappingImpressions	Multiple impressions in ROI that overlap. The impressions may be from the same source. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. See also MultipleNonOverlappingImpressions Ghosting Overlapping impressions.
NumHighConfidenceMinutiae	Number of highly-certain minutiae (i.e., minutiae in high clarity areas). Value shall be 0 or a positive integer, and less than or equal to NumMinutiae. See also NumMinutiae
NumMinutiae	Total number of minutiae discovered. Value shall be 0 or a positive integer. See also NumHighConfidenceMinutiae
OpenField	Large area without minutiae. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block.
OrientationCertaintyLevel	Consistency of orientations of ridges within subregions. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. See also ISO/IEC 29794-4:2024, Clause 6.2.2
OrientationClue	Information present to help orient the impression. One or more features (e.g., pattern classification, ridge flow, interphalangeal joint) that help determine orientation. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. Ridge flow helps determine the proper orientation. Pattern classification helps determine the proper orientation.
PatternClassification	Pattern classification can be determined. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. Pattern classification can be readily determined.
PatternForceMinutiae	Impression contains mostly pattern force region. Pattern force is a region of friction ridge skin in which minutiae were forced to form due to pattern type and existing ridge fields during friction ridge formation (source: ASB Technical Report 12). Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. Small area around delta imaged, showing pattern-forced minutiae only.
RidgeColorUncertain	Inability to determine the ridge color in a large portion of the image. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. See also TonalReversal Area of image where ridge color is uncertain or completely inverted.
RidgeFlowContinuity	Orientation differences between a region and its neighbors. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. See also ISO/IEC 29794-4:2024, Clause 6.2.6
RidgeValleyClarity	Percentage of usable area with good ridge-valley contrast. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. See also ISO/IEC 29794-4:2024, Clause 6.2.3
RidgeValleyUniformity	Consistency between ridge and valley widths. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. See also ISO/IEC 29794-4:2024, Clause 6.2.5
SpatialSamplingRatePPI	Estimate of pixels per inch resolution of image. Value shall be a positive integer. Note Do not use EFS::Features::ppi in estimate. Instead, make use of internally-derived calculations (e.g., ridge width, known object size measurement).
SpottyRidges	Ridges are spotty, regardless of reason. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. See also DevelopmentArtifacts Spotty ridges.
TonalReversal	Valleys appear darker than ridges. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block. Areas of ridge tonal reversal.
WetRidges	Ridges that are wet or deposited in a liquid matrix, including blood. Value shall be an integer [0, 100] as encoded in an ISO/IEC 29794-1:2024 quality block.