KEYWORDS: 3D modeling, Thermal modeling, Thermography, 3D image processing, 3D acquisition, Infrared cameras, Temperature metrology, Cameras, Infrared imaging
Thermography is a highly beneficial non-invasive and non-contact tool that finds applications in various fields, such as building inspection, industrial equipment monitoring, quality control, and medical evaluations. Analyzing the surface temperature of an object at different points in time, and under varying conditions, can help detect defects, cracks, and anomalies in industry components. In this study, we propose a framework for reproducible and quantitative measurement of surface temperature changes over time using thermal 3D models created with low-cost and portable devices. We present the application of this framework in two cases: to analyze temperature changes over time in a plastic container and to analyze temperature changes before and after medical treatment of a chronic wound. The results on a plastic container and on a chronic wound, show that our approach for multi-temporal registration of thermal 3D models could be a cost-effective and practical solution for studying temperature changes in various applications.
Color, shape (size and volume), and temperature are important clinical features for chronic wound monitoring that could impact diagnosis and treatment. Noninvasive 3D measurement are better and more accurate than those in 2D, but expensive equipment and complexity of the setup prevent their use at hospitals. Therefore, the use of affordable and lightweight devices with straightforward protocol to acquire images for evaluations is fundamental to provide a functional and useful evaluation of the wound. In this work, an automated methodology to generate color and thermal 3D models is presented by using portable devices: a commercial mobile device with a connected portable thermal camera. The 3D model of the wound surface is estimated from a series of color images using structure-from-motion (SfM) while thermal information is overlaid to the ulcer’s relief for multimodal wound evaluation. The proposed methodology contributes with a proof of concept for multimodal wound monitoring in the hospital environment with a simple hand-held shooting protocol. The system was used efficiently with 5 patients on wounds of various sizes and types.
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