ASTM E3149-18

4.1 Morphological analysis used for facial comparison should utilize consistent terminology and methodology. This guide provides a standard set of facial components, characteristics, and descriptors to be used as a framework in conjunction with a systematic method of analysis for facial image comparison.

4.2 The order of the facial components in this set is presented from the top of the face to the bottom, not in order of importance or priority.

4.3 Within this guide, the term “face” generally refers to the face, head, and neck inclusively unless specified otherwise.

4.4 There are several instances in this guide in which the term “distance” or “approximate distance” is used. When this term is used in this guide, it does not mean to imply that the precise value of this dimension shall be determined, but rather the relative size of this dimension compared to the overall width or height of the face, if not otherwise specified. In this guide, it is recommended that photoanthropometry not be used at all because of its limitations.

1.1 This guide defines a set of facial components, characteristics, and descriptors to be considered during a morphological facial comparison (see FISWG Best Practices for Facial Image Comparison Feature List for Morphological Analysis).

1.2 This set of facial components, characteristics, and descriptors describes the facial features that may be visible and comparable between images.

1.3 This guide defines a standard set of facial components, characteristics, and descriptors that should be used for facial comparison.

1.4 This guide does not define the comparison process itself, just the feature set to be used during such comparisons.

1.5 This guide does not define a classification system to constrain how those descriptors shall be articulated as applied to samples.

1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.