Interpol review of questioned documents 2016–2019

Deviterne-Lapeyre, Capitaine Marie

doi:10.1016/j.fsisyn.2020.01.012

Cited by 17 publications

(12 citation statements)

References 170 publications

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“…In real scenarios, skilled forgery detection is a challenging task, particularly for forensic document examiners (FDEs) [6], [7].…”

Section: Experiments a Methodsmentioning

confidence: 99%

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Online Signature Verification Using Locally Weighted Dynamic Time Warping via Multiple Fusion Strategies

Okawa

2022

IEEE Access

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Online signature verification is the process of using a dynamic signature verification system to confirm the writer's identity. It can be used as a security system to confirm entrance applications and password substitutes, as well as a forensic tool to assist an expert's investigation. This study proposes a novel online signature verification system based on a single-template strategy to improve performance in real-world scenarios. It employs discriminative mean signature template sets as well as fusion strategies of multiple local weighting and warping schemes, for dynamic time warping (DTW). The first step is to generate a set of user-specific mean signature templates for each feature using a recent time-series averaging method, namely, Euclidean barycenter-based DTW barycenter averaging. Then, using multiple and direct matching points between the mean signature templates and references for dependent and independent DTW, we obtain a local weighting estimate considering local stability sequences. Furthermore, we develop fusion strategies for calculating locally weighted DTW sets and concatenating them as a feature vector for each warping, followed by the construction of a support vector machine (SVM) classifier. Finally, in the verification phase, we use the single-template technique to compute a discriminative fused score using SVMs between the mean signature template sets and a query sample. The effectiveness of the proposed method is demonstrated by extensive experimental results obtained using three public online signature datasets: SVC2004 Task1/Task2 and MCYT-100.

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“…In real scenarios, skilled forgery detection is a challenging task, particularly for forensic document examiners (FDEs) [6], [7].…”

Section: Experiments a Methodsmentioning

confidence: 99%

“…, ŷ(t) = y(t) − y g y max − y min (6) where x g , y g is the centroid of a signature; {x min , y min } and {x max , y max } are the minimum and maximum values of {x(t), y(t)} for t = 1, 2, . .…”

Section: B Preprocessingmentioning

confidence: 99%

Online Signature Verification Using Locally Weighted Dynamic Time Warping via Multiple Fusion Strategies

Okawa

2022

IEEE Access

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“…Besides, Forensic Chemistry is an interdisciplinary science involving many fields of knowledge such as drugs, , toxic materials, fibers, , fires and explosions, paints, ballistics, fingerprints, or documents, among others, in which a broad set of chemically different analytes can be determined by many types of analytical techniques, such as HPLC, − absorbance, or fluorescence . Specifically, questioned documents are of interest since they can be involved in cases of counterfeit currency, kidnappings, homicides, suicides, blackmail, and the verification of the authenticity of pieces of art, lottery tickets, or historical documentation. , …”

Section: Introductionmentioning

confidence: 99%

Inks in the Analytical Laboratory: A Forensics Activity for Undergraduate Students

Sáiz,

Rupérez-Pascualena

2023

J. Chem. Educ.

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Here, we present a laboratory activity in which the students work on an analysis of a questioned document that was written with one out of five possible pens. As a forensics study, the activity applied chemistry and analytical chemistry tools to solve the case. The students were able to apply polarity and solubility concepts to select and discard some pens. They also learned the basics of fluorescence and the possibilities of using it to detect falsifications. Then, they were able to set up the detection conditions for the HPLC-UV analysis by studying the absorbance behavior of the blue dyes. Finally, the students identified the pen used to write the suicide note and partially characterized the composition of the ink. This multipurpose activity perfectly suits subjects involving analytical techniques and forensics for students with basic knowledge of chemistry that are studying instrumental techniques for the first time.

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“…The absolute dating of documents is still one of the most important challenges for forensic document examiners (FDE) [1][2][3][4]. In the last years, considerable progress has been achieved in the absolute dating of ink and the relative dating of writing and printing sequences [4]. By contrast, the dating of the paper substrate was until now rarely possible or too inaccurate to be useful in court.…”

Section: Introductionmentioning

confidence: 99%

New method for the absolute dating of paper by radiocarbon measurements

Pigorsch

Kießler

Hüls

2022

Journal of Forensic Sciences

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The absolute dating of documents is still one of the most important challenges for forensic document examiners (FDE). The potential difference between the date on a questioned document and the actual year of production of the used paper can be only 1 to 5 years. Until now, there was no analytical method with this accuracy available.This study demonstrates a method for an absolute dating of paper by using the 14 C bomb peak and dating the starch in the paper. Accelerator mass spectroscopy (AMS) radiocarbon measurements were performed on starch extracts and cellulose fibers from 50 paper samples with known production year from 1950 to 2018. For most

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Interpol review of questioned documents 2016–2019

Cited by 17 publications

References 170 publications

Online Signature Verification Using Locally Weighted Dynamic Time Warping via Multiple Fusion Strategies

Online Signature Verification Using Locally Weighted Dynamic Time Warping via Multiple Fusion Strategies

Inks in the Analytical Laboratory: A Forensics Activity for Undergraduate Students

New method for the absolute dating of paper by radiocarbon measurements

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