Age Estimation of the Bloodstains on Different Substrates Based on the Hyperspectral Imaging Technology

Ying Feng; Jing Cai

doi:10.3788/LOP57.053004

Laser & Optoelectronics Progress, Volume. 57, Issue 5, 053004(2020)

Age Estimation of the Bloodstains on Different Substrates Based on the Hyperspectral Imaging Technology

Ying Feng¹ and Jing Cai^1,2,3、*

Author Affiliations

¹Department of Forensic Science, Zhejiang Police College, Hangzhou, Zhejiang 310053, China

²Key Laboratory of Public Security Information Application Based on Big-Data Architecture Ministry of Public Security, Peoples Republic of China, Hangzhou, Zhejiang 310053, China

³Key Laboratory of Drug Prevention and Control Technology of Zhejiang Province, Hangzhou, Zhejiang 310053, China

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Figures & Tables(5)

Fig. 1. Bloodstain samples on three substrates. (a) White ceramic tile; (b) white paper; (c) white cotton cloth

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Fig. 2. Flow chart of proposed method

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Fig. 3. Spectral curves of bloodstains in three substrates with different aging time. (a) White ceramic tile; (b) white paper; (c) white cotton cloth

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Fig. 4. Prediction error comparison of white ceramic tile, white paper, and white cotton cloth in different spectral bands. (a)(c)(e) 400-1000 nm; (b)(d)(f) 550-800 nm

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Table 1. Quantitative analysis of different spectral bands of bloodstains to predict the effect of performance indicators

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Table 1. Quantitative analysis of different spectral bands of bloodstains to predict the effect of performance indicators

Substrates	400-1000 nm					550-800 nm
Substrates	$\begin{matrix} R_{c}^{2} \end{matrix}$	RMSEC /min	$\begin{matrix} R_{P}^{2} \end{matrix}$	RMSEP /min	δ_M /%	$\begin{matrix} R_{c}^{2} \end{matrix}$	RMSEC /min	$\begin{matrix} R_{P}^{2} \end{matrix}$	RMSEP /min	δ_M /%
Tile	0.9999	5.74	0.9998	6.22	3.20	0.9998	7.29	0.9999	6.13	2.18
Paper	0.9981	22.24	0.9993	13.67	6.71	0.9991	14.69	0.9993	13.17	4.99
Cloth	0.9902	51.98	0.9916	43.53	17.62	0.9896	49.00	0.9935	35.57	16.98

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Ying Feng, Jing Cai. Age Estimation of the Bloodstains on Different Substrates Based on the Hyperspectral Imaging Technology[J]. Laser & Optoelectronics Progress, 2020, 57(5): 053004

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Paper Information

Category: Spectroscopy

Received: May. 8, 2019

Accepted: Sep. 4, 2019

Published Online: Mar. 5, 2020

The Author Email: Jing Cai (caijing@zjjcxy.cn)

DOI:10.3788/LOP57.053004

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology