Estimation of Human Age Group by Morphology-based Method Form Fingerprints: A Preliminary Study

There are few morphological methods for fingerprint age analysis, and it is not certain that the mastoid line morphology of fingerprint is correlated with age. Through statistical and correlated analysis of quantifiable feature information, it is found that the number of wrinkles and fine line, the density of mastoid line, the width of mastoid line and small furrow, and other indicators are correlated with age, but the use of these indicators is not enough to analyze the age of the hand imprint remnant. The purpose of this paper is to study the performance characteristics of fingerprints in different age groups, especially the age-related characteristic information that is difficult to be quantified in fingermarks at the present stage, such as the fuzzy phenomenon of fingermarks, the symmetry degree of the edge of friction ridges, and the change rule of sweat holes with age. We explore the specific method of age analysis by fingerprints through observing and summarizing. The fingerprints were observed through the microscope, and the typical examples were visually displayed by fingerprint atlas. Fingerprints are extracted from a large number of samples and represent the characteristics of most samples of the corresponding age. In this paper, the characteristics and performance of different age groups are introduced through text, and the characteristics of fingerprinting performance in different age groups are displayed more intuitively and vividly with the fingerprint atlas. After observing a large number of fingerprint samples in different age groups in the fingerprint archives, the morphological characteristics of fingerprint in different age groups were summarized, and the specific steps and methods of age analysis are preliminarily formed. The specific process of such analysis was showed in combination with practical cases. The map of fingerprint contains the various typical and atypical manifestations of the fingermark samples at the corresponding age. Detailed steps are proposed for a morphological method of age analysis using handprints, which, like a code of practice, can be used by an experienced fingerprint analyst to make a preliminary estimate of the age of the person left behind. This paper provides a direction for researching fingerprint-based age analysis.