Activity analysis of thermal imaging videos using a difference imaging approach

Tattersall, Glenn J.; Danner, Raymond M.; Chaves, Jaime A.; Levesque, Danielle L.

doi:10.1016/j.jtherbio.2020.102611

Cited by 10 publications

(7 citation statements)

References 30 publications

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“…Raw radiance values from all suitable thermographic images (see below) were converted to surface temperature readings in the software FIJI (https://imagej.net/Fiji) according to Planck's law, and according to methods and equations described elsewhere (Minkina & Dudzik, 2009; Tattersall, 2016; Tattersall et al, 2020). Here, emissivity ( ε ) of the eye region and bill were assumed to be 0.95 (Best & Fowler, 1981) and ambient temperature and relative humidity were assumed to be fixed at 18°C and 40%, respectively.…”

Section: Methodsmentioning

confidence: 99%

Infrared thermography as a technique to measure physiological stress in birds: Body region and image angle matter

et al. 2021

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In vertebrates, changes in surface temperature following exposure to an acute stressor are thought to be promising indicators of the physiological stress response that may be captured noninvasively by infrared thermography. However, the efficacy of using stress‐induced changes in surface temperature as indicators of physiological stress‐responsiveness requires: (1) an understanding of how such responses vary across the body, (2) a magnitude of local, stress‐induced thermal responses that is large enough to discriminate and quantify differences among individuals with conventional technologies, and (3) knowledge of how susceptible measurements across different body regions are to systematic error. In birds, temperature of the bare tissues surrounding the eye (the periorbital, or “eye,” region) and covering the bill have each been speculated as possible predictors of stress physiological state. Using the domestic pigeon (Columba livia domestica; n = 9), we show that stress‐induced changes in surface temperature are most pronounced at the bill and that thermal responses at only the bill have sufficient resolution to detect and quantify differences in responsiveness among individuals. More importantly, we show that surface temperature estimates at the eye region experience greater error due to changes in bird orientation than those at the bill. Such error concealed detection of stress‐induced thermal responses at the eye region. Our results highlight that: (1) in some species, bill temperature may serve as a more robust indicator of autonomic stress‐responsiveness than eye region temperature, and (2) future studies should account for spatial orientation of study individuals if inference is to be drawn from infrared thermographic images.

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Section: Methodsmentioning

confidence: 99%

Infrared thermography as a technique to measure physiological stress in birds: Body region and image angle matter

et al. 2021

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“…FLIR video (CSQ) file formats were converted to AVI (FFMPEG) format while retaining the original frame rate, pixel dimensions and colour palette. The conversion was performed using ThermImageJ plugins for the Fiji (ImageJ) environment ( ) and carried out as outlined in Tattersall et al (2020) . The conversion process first split the video file into its subsequent FLIR file format (FFF) image frames using a custom perl script (available in ThermImageJ; ).…”

Section: Methodsmentioning

confidence: 99%

Vocalization-associated respiration patterns: thermography-based monitoring and detection of preparation for calling

Demartsev

Manser

Tattersall

2022

Journal of Experimental Biology

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Vocal emission requires coordination with the respiratory system. Monitoring the increase in laryngeal pressure, needed for vocal production, allows detection of transitions from quiet respiration to vocalization-supporting respiration. Characterization of these transitions could be used to identify preparation for vocal emission and to examine the probability of it manifesting into an actual vocal production event. Specifically, overlaying the subject's respiration with conspecific calls can highlight events of call initiation and suppression, as a mean of signalling coordination and avoiding jamming. Here we present a thermal-imaging based methodology for synchronized respiration and vocalization monitoring of free ranging meerkats. The sensitivity of this methodology is sufficient for detecting transient changes in the subject's respiration associated with the exertion of vocal production. The differences in respiration are apparent not only during the vocal output but also prior to it, marking the potential time frame of the respiratory preparation for calling. A correlation between conspecific calls with elongation of the focal subject's respiration cycles could be related to fluctuations in attention levels or in the motivation to reply. This framework can be used for examining animals’ capability for enhanced respiration control during modulated and complex vocal sequences, detect “failed” vocalisation attempts and investigate the role of respiration cues in the regulation of vocal interactions.

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“…The use of thermal imaging is a very important and useful research method because, as a method for object diagnosis, it allows fast, safe and also accurate measurements in even restrictive space [52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71]. In a deep mine environment, cameras can be used to work in smoky, dusty and dark environments.…”

Section: Methodsmentioning

confidence: 99%

Thermal Imaging Study to Determine the Operational Condition of a Conveyor Belt Drive System Structure

et al. 2021

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The paper discusses the results of a study carried out to determine the thermal condition of a conveyor power unit using a thermal imaging camera. The tests covered conveyors in the main haulage system carrying coal from a longwall. The measurements were taken with a thermal imaging diagnostic method which measures infrared radiation emitted by an object. This technology provides a means of assessing the imminence and severity of a possible failure or damage. The method is a non-contact measuring technique and offers great advantages in an underground mine. The thermograms were analysed by comparing the temperature distribution. An analysis of the operating time of the conveyors was also carried out and the causes of the thermal condition were determined. The main purpose of the research was to detect changes in thermal state during the operation of a belt conveyor that could indicate failure and permit early maintenance and eliminate the chance of a fire. The article also discusses the construction and principle of operation of a thermal imaging camera. The findings obtained from the research analysis on determining the thermal condition of the conveyor drive unit are a valuable source of information for the mine’s maintenance service.

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Activity analysis of thermal imaging videos using a difference imaging approach

Cited by 10 publications

References 30 publications

Infrared thermography as a technique to measure physiological stress in birds: Body region and image angle matter

Infrared thermography as a technique to measure physiological stress in birds: Body region and image angle matter

Vocalization-associated respiration patterns: thermography-based monitoring and detection of preparation for calling

Thermal Imaging Study to Determine the Operational Condition of a Conveyor Belt Drive System Structure

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