종이에 부착된 잠재지문의 세기 평가 방법 연구
Estimation of the latent fingermark intensity deposited on the surface of paper
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초록
잠재지문 현출방법을 개발하려면 지문의 세기를 객관적으로 평가할 수 있는 시스템을 갖추고 있어야 한다. 따라서 본 연구에서는 지문의 세기를 객관적으로 평가할 수 있는 방법을 개발하였다. 잉크젯 프린터와 인공땀을 이용하여 출력세기를 알고 있는 인공잠재지문을 출력한 후 ninhydrin 혹은 DFO로 현출하고, Photoshop의 광도 측정 기능을 이용하여 지문이 현출된 세기를 평가하였다. 그 결과 진하게 출력한 인공잠재지문일수록 histogram intensity가 증가하는 것을 확인할 수 있었다. 또한 선택한 지문의 크기가 감소할수록 광도가 직선적으로 감소하였다. 하나의 지문을 4등분한 후 각 부분의 지문 세기를 측정한 결과 각 부분의 세기가 조금씩 다르게 나타났다. 이 결과를 통해 하나의 손가락이라도 지문의 융선 분포는 균질하지 않다는 것을 알 수 있었다. 그러나 그 차이는 크지 않았기 때문에 splitting 방법을 이용해 동일한 지문을 만드는 방법을 여전히 유효한 방법이라는 것을 알 수 있었다.
Abstract
To study latent fingermark development methods, it is necessary to have a system that objectively evaluates the intensity of the fingermark. Therefore, a fingermark intensity measurement method was devised. Using a printer, the artificial latent fingermarks having known intensities were printed. Artificial latent fingermarks were developed with ninhydrin or DFO, and the development intensities were measured using the image histogram intensity measurement function of Photoshop, and correlation with the fingermark printing intensities and histogram intensities was confirmed. It can be seen that the histogram intensity decreases linearly as the area of the selected area decreases. In addition, the histogram intensity of each part after dividing one fingerprint into four quarters was measured, and the measured values of four parts were slightly different. This is a result of showing that the ridge distribution of one fingermark is not homogeneous. However, because the difference was not significant, the authors think that the fingermark splitting method is still a convenient and effective way to compare the sensitivity of various latent fingermark developing methods.
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