Smart Forensic Phone: Colorimetric analysis of a bloodstain for age estimation using a smartphone

Shin, Jong‐Shik; Choi, Seoyeon; Yang, Jung Sik; Song, Jaewoo; Choi, Jong Soon; Jung, Hyo Il

doi:10.1016/j.snb.2016.11.142

Cited by 78 publications

(28 citation statements)

References 12 publications

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“…By imaging the color pattern on Figure 1 It is well known in the literature that color evaluation by distinct mobile-phones leads to significant difference of color values [7]. The obtained color values of an acquired picture are influenced by the ambient illumination, the camera color filters, and the white balance algorithms explored [24].…”

Section: Results and Discursionmentioning

confidence: 99%

“…However, the color analysis of an object using distinct cell-phones and Apps leads to disparate results [6]. The popularization of mobile-phones and the improvement of their components allowed the implementation of different colorimetric analysis techniques in several areas such as forensic science [7], biotechnology [8] [9], and life sciences [10]. Colorimeters base on mobile-phone can be classified as: 1) applications with hardware components and 2) standalone devices [11].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Self-Referencing Method for Relative Color Intensity Analysis Using Mobile-Phone

Souza¹,

Oliveira²,

Oliveira³

et al. 2018

OPJ

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Mobile-phones have been widely explored on colorimetric evaluations. However, their use with different built-in image systems and acquisition configuration, in an environment with non-controlled illumination, limits the establishment of an accurate color analysis. To overcome this restriction, the determination of the absolute color of an object can be overlooked and a relative color value determined. In this work, we establish a new approach for spectroscopic evaluation based on cell-phone imaging, with no previous calibration, determining relative color values. The standalone relative color intensity method is evaluated under the use of four distinct mobile-phones and different illumination conditions. The capability to distinguish different color shades exploring the proposed self-referenced relative color intensity technique is appraised. Moreover, the potential use of the method is demonstrated by evaluating the chemical-adsorption process of Cysteamine molecules on gold nanoparticle surfaces. The proposed self-referenced technique can improve and expand the use of mobile-phones in spectroscopic applications.

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Section: Results and Discursionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Self-Referencing Method for Relative Color Intensity Analysis Using Mobile-Phone

Souza¹,

Oliveira²,

Oliveira³

et al. 2018

OPJ

View full text Add to dashboard Cite

show abstract

“…Many modern smartphone models are equipped with high-resolution cameras and applications are available to measure the RGB output from images, allowing for colorimetric analysis. Researchers have devised a novel method ("Smart Forensic Phone") of estimating the age of bloodstains using a colorimetric analysis of bloodstain images taken with a smartphone over a fixed time period [107]. However, this analysis can only be performed on bloodstains <42 hours old which severely limits its potential use and requires more optimisation to be used on older bloodstains.…”

Section: Synthetic Biologymentioning

confidence: 99%

Field-based detection of biological samples for forensic analysis: Established techniques, novel tools, and future innovations

Morrison

Watts

Hobbs

et al. 2018

Forensic Science International

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Field based forensic tests commonly provide information on the presence and identity of biological stains and can also support the identification of species. Such information can support downstream processing of forensic samples and generate rapid intelligence. These approaches have traditionally used chemical and immunological techniques to elicit the result but some are known to suffer from a lack of specificity and sensitivity. The last 10 years has seen the development of field-based genetic profiling systems, with specific focus on moving the mainstay of forensic genetic analysis, namely STR profiling, out of the laboratory and into the hands of the non-laboratory user. In doing so it is now possible for enforcement officers to generate a crime scene DNA profile which can then be matched to a reference or database profile. The introduction of these novel genetic platforms also allows for further development of new molecular assays aimed at answering the more traditional questions relating to body fluid identity and species detection. The current drive for field-based molecular tools is in response to the needs of the criminal justice system and enforcement agencies, and promises a step-change in how forensic evidence is processed. However, the adoption of such systems by the law enforcement community does not represent a new strategy in the way forensic science has integrated previous novel approaches. Nor do they automatically represent a threat to the quality control and assurance practices that are central to the field. This review examines the historical need and subsequent research and developmental breakthroughs in field-based forensic analysis over the past two decades with particular focus on genetic methods Emerging technologies from a range of scientific fields that have potential applications in forensic analysis at the crime scene are identified and associated issues that arise from the shift from laboratory into operational field use are discussed.

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“…However, this method was inappropriate for forensic practice because it in actual cases it is difficult to extract an adequate amount of serum from dried bloodstains. Additionally, several novel techniques have been explored to determine the age of bloodstains, including fluorescence lifetime measurements 10 , 11 , atomic force microscopy 12 and the use of smartphones for quantifiable colour change correlations 13 .…”

Section: Introductionmentioning

confidence: 99%

Estimation of the age of human bloodstains under the simulated indoor and outdoor crime scene conditions by ATR-FTIR spectroscopy

Lin

Zhang

Wang

et al. 2017

Sci Rep

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Estimation of the age of human bloodstains is of great importance in forensic practices, but it is a challenging task because of the lack of a well-accepted, reliable, and established method. Here, the attenuated total reflection (ATR)-Fourier transform infrared (FTIR) technique combined with advanced chemometric methods was utilized to determine the age of indoor and outdoor bloodstains up to 107 days. The bloodstain storage conditions mimicked crime scene scenarios as closely as possible. Two partial least squares regression models—indoor and outdoor models with 7–85 days—exhibited good performance for external validation, with low values of predictive root mean squared error (5.83 and 4.77) and high R2 values (0.94 and 0.96) and residual predictive deviation (4.08 and 5.14), respectively. Two partial least squares–discriminant analysis classification models were built and demonstrated excellent distinction between fresh (age ≤1 d) and older (age >1 d) bloodstains, which is highly valuable for forensic investigations. These findings demonstrate that ATR-FTIR spectroscopy coupled with advanced chemometric methods can be employed as a rapid and non-destructive tool for age estimation of bloodstains in real-world forensic investigation.

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Smart Forensic Phone: Colorimetric analysis of a bloodstain for age estimation using a smartphone

Cited by 78 publications

References 12 publications

Self-Referencing Method for Relative Color Intensity Analysis Using Mobile-Phone

Self-Referencing Method for Relative Color Intensity Analysis Using Mobile-Phone

Field-based detection of biological samples for forensic analysis: Established techniques, novel tools, and future innovations

Estimation of the age of human bloodstains under the simulated indoor and outdoor crime scene conditions by ATR-FTIR spectroscopy

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