Monochrome Camera Conversion: Effect on Sensitivity for Multispectral Imaging (Ultraviolet, Visible, and Infrared)

Crowther, Jonathan

doi:10.3390/jimaging8030054

Cited by 3 publications

(2 citation statements)

References 33 publications

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“…Figure 2 shows the modified Nikon D3500 camera. The bandpass hot mirror filter—CFA colour filter matrix—has been extracted and replaced by a full spectrum filter, to increase its nominal sensitivity [ 24 ]. The sensor has been conveniently shifted closer to the nodal point of the lens, recalibrating it in order to correct the image focus, important when it is necessary to locate latent traces using infrared illumination.…”

Section: Methodsmentioning

confidence: 99%

Location of Latent Forensic Traces Using Multispectral Bands

Mosquera¹,

Alarcos

Gardel

2022

Sensors

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In this paper, a conventional camera modified to capture multispectral images, has been used to locate latent forensic traces with a smart combination of wavelength filters, capturing angle, and illumination sources. There are commercial multispectral capture devices adapted to the specific tasks of the police, but due to their high cost and operation not well adapted to the field work in a crime scene, they are not currently used by forensic units. In our work, we have used a digital SLR camera modified to obtain a nominal sensitivity beyond the visible spectrum. The goal is to obtain forensic evidences from a crime scene using the multispectral camera by an expert in the field knowing which wavelength filters and correct illumination sources should be used, making visible latent evidences hidden from the human-eye. In this paper, we show a procedure to retrieve from latent forensic traces, showing the validity of the system in different real cases (blood stains, hidden/erased tattoos, unlocking patterns on mobile devices). This work opens the possibility of applying multispectral inspections in the forensic field specially for operational units for the location of latent through non-invasive optical procedures.

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Section: Methodsmentioning

confidence: 99%

Location of Latent Forensic Traces Using Multispectral Bands

Mosquera¹,

Alarcos

Gardel

2022

Sensors

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“…Monochrome sensors do not have the colour filter array (CFA), which generates colour information for each pixel. The dyes used in the CFA reduce sensitivity in the UV spectrum rapidly from 400 nm to around 350 nm [33]. Hence, the monochrome camera has, in general, a higher sensitivity to UV compared to colour cameras.…”

Section: Uv Camera Sensormentioning

confidence: 99%

Design and Development of an Ultraviolet All-Sky Imaging System

Mathanlal,

Martin-Torres

2023

Sensors

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All-sky cameras capture a panoramic view of the full sky from horizon to horizon to generate a wide-angle image of the observable sky. State-of-the-art all-sky imagers are limited to imaging in the visible and infrared spectrum and cannot image in the UV spectrum. This article describes the development of an all-sky imaging system capable of capturing 130° wide-angle sky images from horizon to horizon in the UV-AB spectrum. The design of the UV all-sky imaging system is based on low-cost, accessible, and scalable components to develop multiple images that can be deployed over a wider geographical area. The spectral response of the camera system has been validated in the UV spectrum (280–420 nm) using a monochromatic UV beam with an average power output of 22 nW. UV all-sky imaging systems complement existing infrared and visible all-sky cameras. They have wide applications in astronomy, meteorology, atmospheric science, vulcanology, meteors and auroral monitoring, and the defence sector.

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Compact and low-cost deep-ultraviolet microscope system for label-free molecular imaging and point-of-care hematological analysis

Gorti¹,

Kaza²,

Williams³

et al. 2023

Biomed. Opt. Express

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Deep-ultraviolet (UV) microscopy enables label-free, high-resolution, quantitative molecular imaging and enables unique applications in biomedicine, including the potential for fast hematological analysis at the point-of-care. UV microscopy has been shown to quantify hemoglobin content and white blood cells (five-part differential), providing a simple alternative to the current gold standard, the hematological analyzer. Previously, however, the UV system comprised a bulky broadband laser-driven plasma light source along with a large and expensive camera and 3D translation stage. Here, we present a modified deep-UV microscope system with a compact footprint and low-cost components. We detail the novel design with simple, inexpensive optics and hardware to enable fast and accurate automated imaging. We characterize the system, including a modified low-cost web-camera and custom automated 3D translation stage, and demonstrate its ability to scan and capture large area images. We further demonstrate the capability of the system by imaging and analyzing blood smears, using previously trained networks for automatic segmentation, classification (including 5-part white blood cell differential), and colorization. The developed system is approximately 10 times less expensive than previous configurations and can serve as a point-of-care hematology analyzer, as well as be applied broadly in biomedicine as a simple compact, low-cost, quantitative molecular imaging system.

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Monochrome Camera Conversion: Effect on Sensitivity for Multispectral Imaging (Ultraviolet, Visible, and Infrared)

Cited by 3 publications

References 33 publications

Location of Latent Forensic Traces Using Multispectral Bands

Location of Latent Forensic Traces Using Multispectral Bands

Design and Development of an Ultraviolet All-Sky Imaging System

Compact and low-cost deep-ultraviolet microscope system for label-free molecular imaging and point-of-care hematological analysis

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