1.1 This standard provides a framework for opinions that can be reached by a practitioner performing comparisons of people, objects, or scenes captured in images, it lists categories for opinions about the relative support that the images provide for the hypothesis that they depict the same source as opposed to the hypothesis that they depict a different source.
1.1.1 This standard does not assign ranges of numerical likelihood ratios for the strength or weight of evidence, to opinion categories or mandate the use of numerical likelihood ratio. However, if a practitioner assigns a numerical likelihood ratio in evaluating evidence, a full description of the statistical models and analysis methods used shall be reported along with the label for the category into which the practitioner determines the likelihood ratio falls.
1.1.2 This standard of opinion categories is not intended for the comparison of images of impressions (e.g., tool marks, friction ridge) for the determination of the origin of the impression.
Keywords
opinion scale; image comparison
Rationale
This standard is addressing the opinions categories that shall be reached for image-based comparisons which do not already have a discipline specific opinion scale. This will provide the Facial Identification and Video Imaging Technology and Analysis disciplines with a scale for use in their image-based comparisons.
