scholarly journals Convolutional Neural Networks for Semantic Segmentation as a Tool for Multiclass Face Analysis in Thermal Infrared

2021 ◽  
Vol 40 (1) ◽  
Author(s):  
David Müller ◽  
Andreas Ehlen ◽  
Bernd Valeske
Keyword(s):  
Neural Networks ◽  
Convolutional Neural Networks ◽  
Semantic Segmentation ◽  
Thermal Infrared ◽  
Relative Temperature ◽  
Face Analysis ◽  
Image Translation ◽  
The Face ◽  
Live Image ◽  
Quantitative Thermography

AbstractConvolutional neural networks were used for multiclass segmentation in thermal infrared face analysis. The principle is based on existing image-to-image translation approaches, where each pixel in an image is assigned to a class label. We show that established networks architectures can be trained for the task of multiclass face analysis in thermal infrared. Created class annotations consisted of pixel-accurate locations of different face classes. Subsequently, the trained network can segment an acquired unknown infrared face image into the defined classes. Furthermore, face classification in live image acquisition is shown, in order to be able to display the relative temperature in real-time from the learned areas. This allows a pixel-accurate temperature face analysis e.g. for infection detection like Covid-19. At the same time our approach offers the advantage of concentrating on the relevant areas of the face. Areas of the face irrelevant for the relative temperature calculation or accessories such as glasses, masks and jewelry are not considered. A custom database was created to train the network. The results were quantitatively evaluated with the intersection over union (IoU) metric. The methodology shown can be transferred to similar problems for more quantitative thermography tasks like in materials characterization or quality control in production.

Automatic interference method for measuring transparent film thickness

1993 ◽  
Vol 32 (13) ◽  
pp. 2292 ◽  
Author(s):  
A. González-Cano ◽  
E. Bernabéu
Keyword(s):  
Film Thickness ◽  
Interference Method ◽  
Transparent Film

A device for measuring the taper of plates by an interference method

2011 ◽  
Vol 78 (3) ◽  
pp. 227
Author(s):  
B. E. Moshkin ◽  
S. V. Maksimenko
Keyword(s):  
Interference Method

The Electrically Controlled Birefringence Measurement Influence of Liquid Crystal Caused by Absorption Effect in Infrared Region

2014 ◽  
Vol 875-877 ◽  
pp. 467-471
Author(s):  
Ning Wang ◽  
Xiao Xia Li
Keyword(s):  
Liquid Crystal ◽  
Absorption Coefficient ◽  
Approximate Method ◽  
Nematic Liquid Crystal ◽  
Infrared Region ◽  
Interference Method ◽  
Absorption Coefficients ◽  
Absorption Effect ◽  
Ordinary Light

The electrically controlled birefringence of nematic liquid crystal BL-009 was measured by polarized interference method. The influence of LC absorption effect, the birefringence variation, is discussed in this paper. The experiments results showed the influence to birefringence is big in infrared region. Not only the birefringence value is greatly different with that of unconsidering absorption effect, but also the gradient changing of birefringence curves is obvious. Furthermore, the electrically controlled birefringences of two conditions are compared when the absorption coefficients of ordinary light and the extraordinary light are nearly same and greatly different. The analysis demonstrated the approximate method of absorption coefficient is feasible.

Interference method for certifying and testing IPPK-3M involute cams

1974 ◽  
Vol 17 (11) ◽  
pp. 1690-1692
Author(s):  
G. Ya. Gafanovich ◽  
T. G. Gatskalova
Keyword(s):  
Interference Method

Cuprophane membrane permeability to urea studied by optical interference method

2007 ◽  
Vol 136 (1-2) ◽  
pp. 35-37 ◽  
Author(s):  
Zenon Woźniak ◽  
Michał S. Kaczmarek ◽  
Zdzisław Błaszczak
Keyword(s):  
Membrane Permeability ◽  
Interference Method ◽  
Optical Interference
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