Development and validation of a quantitative model for the subjective and objective minimum resolvable temperature difference of thermal imaging systems

Khare, Sudhir; Singh, Manvendra K.; Kaushik, Brajesh Kumar

doi:10.1117/1.oe.58.10.104111

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…The studies in [13,14] discussed the possibilities for objective measurements and alternative MRTD measurement methods. Some researchers [15][16][17] used an indirect method to evaluate the MRTD by computing the modulation transfer function and the noise equivalent temperature difference (NETD) of the thermal imager. Furthermore, a mathematical model [18] for numerical estimation of the MRTD has been proposed, while other scientists have attempted to use indirect methods to generate the four-rod targets using computer simulations [19] or a controlled blackbody [20].…”

Section: Related Work Mrtd Measurement Developmentmentioning

confidence: 99%

Multiscale Deblurred Feature Extraction Network for Automatic Four-Rod Target Detection in MRTD Measuring Process of Thermal Imagers

Guo

Guan

2023

Sensors

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The minimum resolvable temperature difference (MRTD) at which a four-rod target can be resolved is a critical parameter used to assess the comprehensive performance of thermal imaging systems, which is important for technological innovation in military and other fields. Recently, there have been some attempts to use an automatic objective approach based on deep learning to take the place of the classical manual subjective MRTD measurement approach, which is strongly affected by the psychological subjective factors of the experimenter and is limited in accuracy and speed. However, the scale variability of four-rod targets and the low pixels of infrared thermal cameras have turned out to be a challenging problem for automatic MRTD measurement. We propose a multiscale deblurred feature extraction network (MDF-Net), a backbone based on a yolov5 neural network, in an attempt to solve the aforementioned problem. We first present a global attention mechanism (GAM) attention module to represent strong images of the four-rod targets. Next, a Rep VGG module is introduced to decrease the blur. Our experiments show that the proposed method achieves the desired effect and state-of-the-art detection results, which innovatively improve the accuracy of four-rod target detection to 82.3% and thus make it possible for the thermal imagers to see further and to respond faster and more accurately.

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Section: Related Work Mrtd Measurement Developmentmentioning

confidence: 99%

Multiscale Deblurred Feature Extraction Network for Automatic Four-Rod Target Detection in MRTD Measuring Process of Thermal Imagers

Guo

Guan

2023

Sensors

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“…Some research shows that NETD is a critical aspect to show the performance of a thermal camera [ 31 , 32 , 33 , 34 ]. The value of NETD is also an essential variable in using low-cost thermal cameras for applications in the medical field.…”

Section: System Architecture In Generalmentioning

confidence: 99%

Implementation of Thermal Camera for Non-Contact Physiological Measurement: A Systematic Review

Manullang

Lin

Lai

et al. 2021

Sensors

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Non-contact physiological measurements based on image sensors have developed rapidly in recent years. Among them, thermal cameras have the advantage of measuring temperature in the environment without light and have potential to develop physiological measurement applications. Various studies have used thermal camera to measure the physiological signals such as respiratory rate, heart rate, and body temperature. In this paper, we provided a general overview of the existing studies by examining the physiological signals of measurement, the used platforms, the thermal camera models and specifications, the use of camera fusion, the image and signal processing step (including the algorithms and tools used), and the performance evaluation. The advantages and challenges of thermal camera-based physiological measurement were also discussed. Several suggestions and prospects such as healthcare applications, machine learning, multi-parameter, and image fusion, have been proposed to improve the physiological measurement of thermal camera in the future.

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Development and validation of a quantitative model for the subjective and objective minimum resolvable temperature difference of thermal imaging systems

Cited by 2 publications

References 10 publications

Multiscale Deblurred Feature Extraction Network for Automatic Four-Rod Target Detection in MRTD Measuring Process of Thermal Imagers

Multiscale Deblurred Feature Extraction Network for Automatic Four-Rod Target Detection in MRTD Measuring Process of Thermal Imagers

Implementation of Thermal Camera for Non-Contact Physiological Measurement: A Systematic Review

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