Forensic Photography

Spring, Gale

doi:10.1016/b978-0-240-80740-9.50104-5

Cited by 3 publications

(2 citation statements)

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“…Forensic analysis requires images not only technically correct, but also providing well‐documented detailed information suitable for presentation in court environments . Monochrome images produced by our method fulfill these requirements by producing low noise levels and good contrast with a standardized technique.…”

Section: Discussionmentioning

confidence: 93%

Characterization of Digital Cameras for Reflected Ultraviolet Photography; Implications for Qualitative and Quantitative Image Analysis During Forensic Examination

Garcia

Wilksch

Spring

et al. 2013

Journal of Forensic Sciences

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Reflected ultraviolet imaging techniques allow for the visualization of evidence normally outside the human visible spectrum. Specialized digital cameras possessing extended sensitivity can be used for recording reflected ultraviolet radiation. Currently, there is a lack of standardized methods for ultraviolet image recording and processing using digital cameras, potentially limiting the implementation and interpretation. A methodology is presented for processing ultraviolet images based on linear responses and the sensitivity of the respective color channels. The methodology is applied to a FujiS3 UVIR camera, and a modified Nikon D70s camera, to reconstruct their respective spectral sensitivity curves between 320 and 400 nm. This method results in images with low noise and high contrast, suitable for qualitative and/or quantitative analysis. The application of this methodology is demonstrated in the recording of latent fingerprints.

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Section: Discussionmentioning

confidence: 93%

Characterization of Digital Cameras for Reflected Ultraviolet Photography; Implications for Qualitative and Quantitative Image Analysis During Forensic Examination

Garcia

Wilksch

Spring

et al. 2013

Journal of Forensic Sciences

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“…There are many examples of the use of imaging techniques to record reflected visible (400-700 nm) [1] and invisible radiation, including ultraviolet-A (UVA) (320-400 nm) [2] and near-infrared (NIR) (780-1200 nm) [3], for visualising and collecting information useful as evidence in court rooms [3,4]. However, an important consideration for the use of evidence that might be relied upon by an expert to present an opinion in a court room scenario is that such evidence should be based on well-founded and repeatable scientific principles [1,5,6].…”

Section: Introductionmentioning

confidence: 99%

Hot Shoes in the Room: Authentication of Thermal Imaging for Quantitative Forensic Analysis

2018

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Thermal imaging has been a mainstay of military applications and diagnostic engineering. However, there is currently no formalised procedure for the use of thermal imaging capable of standing up to judicial scrutiny. Using a scientifically sound characterisation method, we describe the cooling function of three common shoe types at an ambient room temperature of 22 • C (295 K) based on the digital output of a consumer-grade FLIR i50 thermal imager. Our method allows the reliable estimation of cooling time from pixel intensity values within a time interval of 3 to 25 min after shoes have been removed. We found a significant linear relationship between pixel intensity level and temperature. The calibration method allows the replicable determination of independent thermal cooling profiles for objects without the need for emissivity values associated with non-ideal black-body thermal radiation or system noise functions. The method has potential applications for law enforcement and forensic research, such as cross-validating statements about time spent by a person in a room. The use of thermal images can thus provide forensic scientists, law enforcement officials, and legislative bodies with an efficient and cost-effective tool for obtaining and interpreting time-based evidence.

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A New Theoretical Framework regarding the Application and Reliability of Photographic Evidence

Porter

2011

The International Journal of Evidence & Proof

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The application of photographic evidence within forensic science and the judicial system has been in practice since the birth of photography itself. However, with more than a century of application, the compelling nexus between photography and physical evidence has no clear theoretical framework that explains this pivotal relationship. From a pragmatic perspective, this article proposes a new theoretical framework that focuses on the reliability of photographic evidence as the central theme of the model. It provides a description of physical evidence as various modes of inquiry and introduces the concept that photographic evidence reliability should be considered based on the source of the photographic material. The theoretical framework introduces taxonomical descriptors of photographic evidence including: (1) analyse, (2) document, (3) describe (visual narrative), and (4) witness forms of photographic modes of inquiry. Visual culture intellectual John Berger 1 said: 'At one level there are no photographs which can be denied. All photographs have a status of fact. What has to be examined is in what way photography can and cannot give meaning to facts.' This article will examine the critical concepts regarding how photographic evidence can be considered as reliable when used as physical evidence.

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Forensic Photography

Cited by 3 publications

References 0 publications

Characterization of Digital Cameras for Reflected Ultraviolet Photography; Implications for Qualitative and Quantitative Image Analysis During Forensic Examination

Characterization of Digital Cameras for Reflected Ultraviolet Photography; Implications for Qualitative and Quantitative Image Analysis During Forensic Examination

Hot Shoes in the Room: Authentication of Thermal Imaging for Quantitative Forensic Analysis

A New Theoretical Framework regarding the Application and Reliability of Photographic Evidence

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