In most deaths caused by explosions, the fragment of explosive remained on the victim's body can provide valuable clues to forensic investigation. However, the examination of the skin and appendages at the scene of explosion, which may reveal clue to the identity of an individual, has not been extensively studied. Compared with visual appearance of the epidermis surface that affected by various wounds, skin adnexa embedded in the dermis has a more stable morphology as an inner biometric. Hair follicles are formed when a fetus is 5 months old and distributed fairly evenly throughout the body, with the exception of hairless palms and soles. Therefore, we focus on the distribution of hair follicles in order to infer information of age, gender, and race/ethnicity. Optical coherence tomography (OCT) is a novel forensic imaging method, which achieves non-destructive, high-resolution and most importantly cross-sectional imaging. In this study, we design and develop a custom-built spectral-domain three-dimensional (3D) OCT system with a portable handheld probe to detect and reconstruct the hair follicles in the facial skin. We test our system on the forehead and preauricular skin of 2 adult volunteers and demonstrate the high quality visualization of hair follicles beneath the epidermis. The diameter, orientation, density and shape of hair follicles can be extracted from the 3D volume data. The preliminary analysis suggests that these parameters vary from different part of body and have individual difference. Eventually, we believe 3D OCT is promising tool for the examination of hair follicles for forensic purpose.
Purpose to find an efficient, non-destructive examining method for showing the disappearing words after writing with automatic disappearance pen. Method Using the imaging spectrometer to show the potential disappearance words on paper surface according to different properties of reflection absorbed by various substances in different bands. Results the disappeared words by using different disappearance pens to write on the same paper or the same disappearance pen to write on different papers, both can get good show results through the use of the spectral imaging examining methods. Conclusion Spectral imaging technology can show the disappearing words after writing by using the automatic disappearance pen.
Vehicle paint chip is a common evidence that plays a significant role in many criminal cases. This paper introduced a novel imaging technology - optical coherence tomography (OCT), which can realize non-invasive, rapid, high-resolution and cross-sectional imaging for the identification of vehicle paint chips. In this paper, a 1310nm swept-source OCT system was adopted to implement the paint imaging. The results show that, compared with conventional spectroscopy and SEM methods, OCT technology can directly obtain the tomographic images of the paints without slicing. In addition, the optical attenuation properties were analyzed to provide a new feature for separating different paint samples. The OCT technology and traditional methods can be combined to further narrow the scope of investigation, providing a comprehensive means to determine or rule out the suspect vehicles.
Spectral imaging technology research is becoming more extensive in the field of examination of material evidence. Near-Infrared spectral imaging technology is an important part of the full spectrum of imaging technology. This paper finished the experiment contents of the Near-Infrared spectrum imaging method and image acquisition system Near-Infrared spectral imaging technology. The experiment of Near-Infrared spectral imaging method obtains the image set of the Near-Infrared spectrum, and formats a pseudo-color images to show the potential traces successfully by processing the set of spectral images; Near-Infrared spectral imaging technology explores the technology method of obtaining the image set of Near-Infrared spectrometer and image acquisition system, and extensive access to the Near-Infrared spectrum information of latent blood, stamp and smear fingerprints on common objects, and study the characteristics of the Near-Infrared spectrum. Near-Infrared spectroscopic imaging experiments explores a wide variety of Near-Infrared reflectance spectra of the object material curve and its Near-Infrared spectrum of imaging modalities, can not only gives a reference for choosing Near-Infrared wavelength to show the object surface potential traces of substances, but also gives important data for the Near-Infrared spectrum of imaging technology development.
Fingerprints are the most important evidence in crime scene. The technology of developing latent fingerprints is one of the hottest research areas in forensic science. Recently, multispectral imaging which has shown great capability in fingerprints development, questioned document detection and trace evidence examination is used in detecting material evidence. This paper studied how to eliminate background interference from non-porous and porous surface latent fingerprints by rotating filter wheel ultraviolet multispectral imaging. The results approved that background interference could be removed clearly from latent fingerprints by using multispectral imaging in ultraviolet bandwidth.
Spectral imaging technology research is becoming more popular in the field of forensic
science. Ultraviolet spectral imaging technology is an especial part of the full spectrum of imaging
technology. This paper finished the experiment contents of the ultraviolet spectrum imaging method
and image acquisition system based on ultraviolet spectral imaging technology. Ultraviolet spectral
imaging experiments explores a wide variety of ultraviolet reflectance spectra of the object material
curve and its ultraviolet spectrum of imaging modalities, can not only gives a reference for choosing
ultraviolet wavelength to show the object surface potential traces of substances, but also gives
important data for the ultraviolet spectrum of imaging technology development.
Spectral imaging technology research is becoming more extensive in the field of examination of material evidence. UV spectral imaging technology is an important part of the full spectrum of imaging technology. This paper summarizes the application of the results of UV imaging technology in the field of evidence examination, explores the common object of potential fingerprints of UV spectra characteristic for the research objectives, which shows the potential traces of criminal using the ultraviolet spectrum imaging method.
In this study, the potential of visible and near-infrared spectral imaging as a technique of document inspection was
examined. Doubtful documents are often found in economic cases, distinguished between original and added strokes and
detected blurry characters are very useful for judgment. Burned, covered and rinsed documents in which the characters
can't be identified with naked eyes were experimentally studied with a visible spectral imaging technique. Meanwhile,
the same color inks were detected by both visible and near-infrared imaging spectrometers. Classification of spectral
images was carried out in specialist spectral imaging software packager Misystem provided by Institute of Forensic
Science. The technique significantly improved the detection of many documents, especially those that might be
considered of poor quality or borderline characters. The visible spectral imaging was successful in detecting the burnt
Chinese characters produced using pencils. It was possible to form spectral images showing the strokes even covered by
Chinese ink by means of imaging at characteristic frequencies. As inks have very different spectral from the clothes,
contribution and contrast of the rinsed lines and illegible seal words on clothes were clearly enhanced. By examining the
spectral images from the inks, it was possible to determine whether the same color inks were written by the different
pens. The results also show that the near-infrared spectrometer is better than visible one in distinguishing the same inks.
In blind testing, spectral imaging was shown to achieve an average 85.1% chance of success. The results reveal the wide
applications of spectral imaging in document evidence analysis. The potential of this technique in forensic science will
be more apparent along with the further and deeper studies.
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