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Non contact pulmonary functional testing through an improved photometric stereo approach

Ahmad, Jahanzeb; Sun, jiuai; Smith, Lyndon; Smith, Melvyn

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Authors

Jahanzeb Ahmad

jiuai Sun

Lyndon Smith Lyndon.Smith@uwe.ac.uk
Professor in Computer Simulation and Machine

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Melvyn Smith Melvyn.Smith@uwe.ac.uk
Research Centre Director Vision Lab/Prof



Abstract

A non-contact computer vision based system is developed for Pulmonary Functional Testing. The unique and novel features of the system are that it views the patients from both front and back and creates a 3D structure of the whole torso. By observing the 3D structure of the torso over time, the amount of air inhaled and exhaled is estimated.
The Photometric Stereo method is used to recover local 3D surface orientation. This technique is good for recovering the local 3D surface orientation but provides no absolute
depth information about the observed scene. To calculate absolute depth information from Photometric Stereo a new Lambertian Diffused Maxima Region (DMR) based algorithm
is employed here. A high (0.96) correlation between breathing volume calculated from Photometric Stereo and Spirometer data is observed.

Citation

Ahmad, J., Sun, J., Smith, L., & Smith, M. (2014, July). Non contact pulmonary functional testing through an improved photometric stereo approach. Paper presented at Medical Image Understanding and Analysis 2014, City University London

Presentation Conference Type Conference Paper (unpublished)
Conference Name Medical Image Understanding and Analysis 2014
Conference Location City University London
Start Date Jul 9, 2014
End Date Jul 14, 2014
Publication Date Jul 9, 2014
Publicly Available Date Jun 6, 2019
Peer Reviewed Peer Reviewed
Keywords non contact, pulmonary functional testing, improved photometric stereo
Public URL https://uwe-repository.worktribe.com/output/814710
Publisher URL http://www.city.ac.uk/medical-image-understanding-and-analysis-2014/programme
Related Public URLs http://www.city.ac.uk/medical-image-understanding-and-analysis-2014
Additional Information Title of Conference or Conference Proceedings : Medical Image Understanding and Analysis 2014

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