Digital image characteristics for enhanced interpretation in child sexual violence case examinations
DOI:
https://doi.org/10.13181/mji.oa.247169Keywords:
clinical medicine, forensic medicine, photography, physical examination, sexual child abuseAbstract
BACKGROUND Photography is an integrated part of standard forensic examination procedures, acting as a guide and the evidence itself. Despite its potential, no research has yet explored the use of 35mm format cameras (digital single-lens reflex [DSLR]) in sexual violence cases. This study aimed to assess the impact of DSLR camera image characteristics on the interpretation of child sexual abuse cases.
METHODS This cross-sectional study used 55 digital photos selected through a convenience sampling. The samples were interpreted by two independent forensic experts who were not affiliated with this research and were compared with the results of the doctor’s examination from the medical records.
RESULTS The metadata extraction results (EXIF data) indicated that all characteristic values had an abnormal distribution. The digital photos’ characteristics were associated with the use of a 50mm focal length (p = 0.011). A range of lens opening values (aperture = f7.1–f8.0), shutter speed (1/100–1/125 sec), and sensor sensitivity (ISO = 800–1600) were not associated with the experts’ interpretation conformity. Additionally, the conformity index for the overall interpretation by the two forensic experts differed in each area.
CONCLUSIONS Focal length of 50mm was significantly related to interpretation conformity. The exposure triangle settings, including aperture (f7.1–f8.0), shutter speed (1/100–1/125 sec), and ISO (800–1600), can serve as fundamental guidelines for digital camera settings in examining child sexual violence cases.
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References
Law (UU) Number 11 of 2008 concerning Information and Electronic Transactions, 2008 (Indonesia).
Cossins A, Jayakody A, Norrie C, Parkinson P. Forensic and medical photography, video recording and video transmission for cases of suspected sexual abuse in children: an evidence check review brokered by the Sax Institute (www.saxinstitute.org.au) for NSW kids and families [Internet]. 2015 [cited 2023 Jul 15]. Available from: https://www.saxinstitute.org.au/wp-content/uploads/Forensic-medical-photography-and-sexual-abuse-in-children.pdf.
Herrmann B, Banaschak S, Csorba R, Navratil F, Dettmeyer R. Physical examination in child sexual abuse: approaches and current evidence. Dtsch Arztebl Int. 2014;111(41):692-703. https://doi.org/10.3238/arztebl.2014.0692
Ricci LR. Photodocumentation in child abuse cases. In: Jenny C, editor. Child abuse and neglect, diagnosis, treatment, and evidence. Elsevier; 2011:215-21. https://doi.org/10.1016/B978-1-4160-6393-3.00027-0
Little K. National protocol for sexual abuse medical forensic examinations - pediatric. United States Department of Justice; 2016.
Evans S, Baylis S, Carabott R, Jones M, Kelson Z, Marsh N, et al. Guidelines for photography of cutaneous marks and injuries: a multi-professional perspective. J Vis Commun Med. 2014;37(1-2):3-12. https://doi.org/10.3109/17453054.2014.911152
Muram D, Arheart KL, Jennings SG. Diagnostic accuracy of colposcopic photographs in child sexual abuse evaluations. J Pediatr Adolesc Gynecol. 1999;12(2):58-61. https://doi.org/10.1016/S1083-3188(00)86627-9
Astrup BS, Lauritsen J, Thomsen JL, Ravn P. Colposcopic photography of genital injury following sexual intercourse in adults. Forensic Sci Med Pathol. 2013;9(1):24-30. https://doi.org/10.1007/s12024-012-9394-2
Kane D, Kennedy KM, Eogan M. The prevalence of genital injuries in post-pubertal females presenting for forensic examination after reported sexual violence: a systematic review. Int J Legal Med. 2024;138(3):997-1010. https://doi.org/10.1007/s00414-023-03117-8
Sommers MS. Defining patterns of genital injury from sexual assault: a review. Trauma Violence Abuse. 2007;8(3):270-80. https://doi.org/10.1177/1524838007303194
White J, Sweet T. Chapter 1 - The basics. In: White J, Sweet T, editors. Nikon DSLR: the ultimate photographer's guide. New York: Routledge; 2010. p. 2-25. https://doi.org/10.1016/B978-0-240-52122-0.00001-7
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