Cardone, D;
Pinti, P;
Di Donato, L;
Merla, A;
(2017)
Warping-based co-registration of thermal infrared images: Study of factors influencing its applicability.
Infrared Physics & Technology
, 83
pp. 142-155.
10.1016/j.infrared.2017.04.020.
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Abstract
A relevant issue for processing biomedical thermal imaging data is the availability of tools for objective and quantitative comparison of images across different conditions or subjects. To this goal, a solution can be offered by projecting the thermal distribution data onto a fictitious template to obtain a common reference for comparison across cases or subjects. In this preliminary study, we tested the feasibility of applying a warping procedure on infrared thermal images. Fifteen thermal images of checkerboard were recorded at three different distances and five different angles in order to evaluate which factor mostly influences the warping accuracy. The accuracy of three different warping transformation models (local weighted mean (LWM), polynomial, affine) was tested by comparing the positioning error between users’ selected fiduciary points on each thermal image and their corresponding reference position assigned on the template image. Fifteen users, divided into three groups upon on their experience in thermal imaging processing, participated in this study in order to evaluate the effect of experience in applying a warping procedure to the analysis of thermal infrared images. The most relevant factor influencing the positioning and thermal errors is the acquisition distance, while the users’ level of experience and the inclination angle do not seem to play the same importance. Comparing the three transformations, the LWM seems to be the best in terms of minimizing the two categories of errors. This preliminary work helps to understand the limits and the possibilities of applying warping techniques for objective, quantitative and automatic thermal image comparisons.
| Type: | Article |
|---|---|
| Title: | Warping-based co-registration of thermal infrared images: Study of factors influencing its applicability |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.infrared.2017.04.020 |
| Publisher version: | https://doi.org/10.1016/j.infrared.2017.04.020 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Technology, Physical Sciences, Instruments & Instrumentation, Optics, Physics, Applied, Physics, Thermal imaging, Warping, Registration, Local weighted mean, Feasibility |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10024994 |
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