A ruler detection method for auto-adjusting scales of shoeprint images

IF 1.9 4区医学 Q2 MEDICINE, LEGAL

Science & Justice Pub Date : 2024-08-02 DOI:10.1016/j.scijus.2024.07.005

Zhijian Wen , Rian Morgan Smith , Mark Connor , J.M. Curran

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引用次数: 0

Abstract

Digital shoeprint comparison often requires the calibration of the image resolution so that features, such as patterns in shoeprints, can be compared on the same scale. To enable scaling, a shoeprint photograph can be taken with a forensic ruler in the same frame to obtain the pixel distance between two nearby graduations. However, manually measuring the number of pixels is a time-consuming process. Additionally, the measurement process might not be conducted accurately when the image is noisy or there is distortion in the ruler. In this study, we present an automated ruler detection method for adjusting the image scale. We show that this method can accurately estimate the image scale with a mean absolute percentage error of 3%. We also conducted automated shoeprint retrieval experiments on scale-unadjusted shoeprint images to show how the automated image scaling might be used in a common forensic process. Our results from these experiments show an increase in the retrieval performance from 0.735 to 0.929 at $S_{1}$ by employing this approach to adjust the shoeprint image scales.

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用于自动调整鞋印图像比例的标尺检测方法

数字鞋印对比通常需要校准图像分辨率，以便在同一比例尺上对比鞋印中的图案等特征。为实现缩放，可在拍摄鞋印照片时在同一画面中使用法医尺，以获取附近两个刻度之间的像素距离。然而，手动测量像素数是一个耗时的过程。此外，当图像有噪声或尺子变形时，测量过程可能无法准确进行。在本研究中，我们提出了一种用于调整图像刻度的自动标尺检测方法。结果表明，该方法可以准确估计图像比例，平均绝对百分比误差为 3%。我们还对未调整比例尺的鞋印图像进行了自动鞋印检索实验，以展示如何在常见的取证过程中使用自动图像比例尺。实验结果表明，采用这种方法调整鞋印图像比例后，检索性能从 0.735 提高到 0.929。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science & Justice 医学-病理学

CiteScore

4.20

自引率

15.80%

发文量

审稿时长

81 days

期刊介绍： Science & Justice provides a forum to promote communication and publication of original articles, reviews and correspondence on subjects that spark debates within the Forensic Science Community and the criminal justice sector. The journal provides a medium whereby all aspects of applying science to legal proceedings can be debated and progressed. Science & Justice is published six times a year, and will be of interest primarily to practising forensic scientists and their colleagues in related fields. It is chiefly concerned with the publication of formal scientific papers, in keeping with its international learned status, but will not accept any article describing experimentation on animals which does not meet strict ethical standards. Promote communication and informed debate within the Forensic Science Community and the criminal justice sector. To promote the publication of learned and original research findings from all areas of the forensic sciences and by so doing to advance the profession. To promote the publication of case based material by way of case reviews. To promote the publication of conference proceedings which are of interest to the forensic science community. To provide a medium whereby all aspects of applying science to legal proceedings can be debated and progressed. To appeal to all those with an interest in the forensic sciences.