Mr. Jobin J. Mathew Profile

Jobin J. Mathew

Doctoral Candidate

SPIE Involvement:

Author

Publications (3)

Proceedings Article | 25 May 2018 Presentation + Paper

Multi-spectral change detection methods: evaluation on simulated and real-world satellite imagery

Jobin Mathew, John Kerekes

Proceedings Volume 10644, 1064411 (2018) https://doi.org/10.1117/12.2305221

KEYWORDS: Satellite imaging, Satellites, Earth observing sensors, Computer simulations, Detection and tracking algorithms, Principal component analysis, Signal to noise ratio, Image registration, Human-machine interfaces, Image segmentation

Read Abstract +

Proceedings Article | 17 May 2016 Paper

Comparison of algorithms for blood stain detection applied to forensic hyperspectral imagery

Jie Yang, David Messinger, Jobin Mathew, Roger Dube

Proceedings Volume 9840, 98400X (2016) https://doi.org/10.1117/12.2223293

KEYWORDS: Hyperspectral imaging, Detection and tracking algorithms, Blood, Forensic science, Principal component analysis, Imaging systems, Scene simulation, Cameras, RGB color model, Visualization

Read Abstract +

Proceedings Article | 17 May 2016 Paper

Spectral feature characterization methods for blood stain detection in crime scene backgrounds

Jie Yang, Jobin Mathew, Roger Dube, David Messinger

Proceedings Volume 9840, 98400E (2016) https://doi.org/10.1117/12.2224099

KEYWORDS: Blood, Forensic science, Near infrared, Absorption, Liquids, Bidirectional reflectance transmission function, Hyperspectral imaging, Target detection, Spectroscopy, Cameras

Read Abstract +

Blood stains are one of the most important types of evidence for forensic investigation. They contain valuable DNA information, and the pattern of the stains can suggest speciﬁcs about the nature of the violence that transpired at the scene. Blood spectral signatures containing unique reﬂectance or absorption features are important both for forensic on-site investigation and laboratory testing. They can be used for target detection and identiﬁcation applied to crime scene hyperspectral imagery, and also be utilized to analyze the spectral variation of blood on various backgrounds. Non-blood stains often mislead the detection and can generate false alarms at a real crime scene, especially for dark and red backgrounds. This paper measured the reﬂectance of liquid blood and 9 kinds of non-blood samples in the range of 350 nm - 2500 nm in various crime scene backgrounds, such as pure samples contained in petri dish with various thicknesses, mixed samples with diﬀerent colors and materials of fabrics, and mixed samples with wood, all of which are examined to provide sub-visual evidence for detecting and recognizing blood from non-blood samples in a realistic crime scene. The spectral diﬀerence between blood and non-blood samples are examined and spectral features such as “peaks” and “depths” of reﬂectance are selected. Two blood stain detection methods are proposed in this paper. The ﬁrst method uses index to denote the ratio of “depth” minus “peak” over“depth” add“peak” within a wavelength range of the reﬂectance spectrum. The second method uses relative band depth of the selected wavelength ranges of the reﬂectance spectrum. Results show that the index method is able to discriminate blood from non-blood samples in most tested crime scene backgrounds, but is not able to detect it from black felt. Whereas the relative band depth method is able to discriminate blood from non-blood samples on all of the tested background material types and colors.

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years