Centro de Documentação da PJ
Analítico de Periódico
CD 316
Corneal-smart phone [Recurso eletrónico] : a novel method to intelligently estimate postmortem interval / JiLong Zheng ..[et al.]
Journal of Forensic Sciences, Vol. 66, n. 1 (January 2021), p. 356-364
Ficheiro de 1,18 MB em formato PDF.
EXAME ANATÓMICO, EXAME MÉDICO-LEGAL, ESTUDO DE CASOS
The changes of postmortem corneal opacity are often used to roughly estimate the postmortem interval (PMI) in forensic practice. The difficulty associated with this time estimate is the lack of objective means to rapidly quantify postmortem corneal changes in crime scenes. This study constructed a data analysis model of PMI estimation and implemented an intelligent analysis system for examining the sequential changes of postmortem corneal digital images, named Corneal-Smart Phone, which can be used to quickly estimate PMI. The smart phone was used in combination with an attachment device that provided a darkroom environment and a steady light source to capture postmortem corneal images. By segmenting the corneal pupil region images, six color features, Red (R), Green (G), Blue (B), Hue (H), Saturation (S), Brightness (V) and four texture features Contrast (CON), Correlation (COR), Angular Second Moment (ASM), and Homogeneity (HOM), were extracted and correlated with PMI model. The results indicated that CON had the highest correlation with PMI (R2 = 0.983). No intra/intersubject variation in CON values were observed (p > 0.05). With the increase in ambient temperature or the decrease in humidity, the CON values were increased. PMI prediction error was.
