A novel method for camera calibration and image alignment of a thermal/visible image fusion system

Bamrungthai, Pongsakon; Wongkamchang, Prasatporn

doi:10.1117/12.2553042

Cited by 3 publications

(3 citation statements)

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“…It was warmed by a heat lamp for recognition purposes. This is significantly simpler and more cost-effective than other methods—for example, the construction of a thermal calibration grid consisting of a heated metal and acrylic plate [ 24 ], using light bulbs as targets [ 25 ], or measuring a blackbody [ 26 ]. Even though the accuracy was lower in comparison, the approach used in this paper was demonstrated to be more than adequate for the current purpose.…”

Section: Discussionmentioning

confidence: 99%

An Anatomical Thermal 3D Model in Preclinical Research: Combining CT and Thermal Images

Schollemann

Pereira

Rosenhain

et al. 2021

Sensors

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Even though animal trials are a controversial topic, they provide knowledge about diseases and the course of infections in a medical context. To refine the detection of abnormalities that can cause pain and stress to the animal as early as possible, new processes must be developed. Due to its noninvasive nature, thermal imaging is increasingly used for severity assessment in animal-based research. Within a multimodal approach, thermal images combined with anatomical information could be used to simulate the inner temperature profile, thereby allowing the detection of deep-seated infections. This paper presents the generation of anatomical thermal 3D models, forming the underlying multimodal model in this simulation. These models combine anatomical 3D information based on computed tomography (CT) data with a registered thermal shell measured with infrared thermography. The process of generating these models consists of data acquisition (both thermal images and CT), camera calibration, image processing methods, and structure from motion (SfM), among others. Anatomical thermal 3D models were successfully generated using three anesthetized mice. Due to the image processing improvement, the process was also realized for areas with few features, which increases the transferability of the process. The result of this multimodal registration in 3D space can be viewed and analyzed within a visualization tool. Individual CT slices can be analyzed axially, sagittally, and coronally with the corresponding superficial skin temperature distribution. This is an important and successfully implemented milestone on the way to simulating the internal temperature profile. Using this temperature profile, deep-seated infections and inflammation can be detected in order to reduce animal suffering.

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Section: Discussionmentioning

confidence: 99%

An Anatomical Thermal 3D Model in Preclinical Research: Combining CT and Thermal Images

Schollemann

Pereira

Rosenhain

et al. 2021

Sensors

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“…To verify DFP measurement with absolute dimensions, two precision machines gauge blocks were purchased for measurement, a popular technique of structured light setup validation [34][35][36]. An 0.5mm thickness Mitutoyo calibration block (MTI-613506-531) was used to verify the DFP measurement setup, placed on an 8mm thickness block (MTI-613204-531) to serve as a reference, shown in Figure 5.…”

mentioning

confidence: 99%

“…This allows the conversion from pixel coordinates to global coordinates, in order to compare measurement of the calibration block to the given specifications provided by Mitutoyo. Using homography, pixel locations of corners of the calibration block were selected, and a homography matrix was automatically generated to correct for viewing angle, a commonly used technique within the machine vision community [34][35][36]. This technique is applicable to the intended spatial calibration technique for in-situ sensor implementation, where the corners of the build platform can be used to establish a ground truth spatial pixel-to-global coordinate transformation matrix.…”

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confidence: 99%

Effects of digital fringe projection operational parameters on detecting powder bed defects in additive manufacturing

O’Dowd

Wachtor

Todd

2021

Additive Manufacturing

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TIRDet: Mono-Modality Thermal InfraRed Object Detection Based on Prior Thermal-To-Visible Translation

Wang,

Colonnier,

Zheng

et al. 2023

Proceedings of the 31st ACM International Conference on Multimedia

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A novel method for camera calibration and image alignment of a thermal/visible image fusion system

Cited by 3 publications

References 0 publications

An Anatomical Thermal 3D Model in Preclinical Research: Combining CT and Thermal Images

An Anatomical Thermal 3D Model in Preclinical Research: Combining CT and Thermal Images

Effects of digital fringe projection operational parameters on detecting powder bed defects in additive manufacturing

TIRDet: Mono-Modality Thermal InfraRed Object Detection Based on Prior Thermal-To-Visible Translation

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