A novel video-based method using projected light to measure trunk volumes during respiration

Angélica Lodovico, Pietro Cerveri, Giancarlo Ferrigno and Ricardo Barros

Computer Methods in Biomechanics and Biomedical Engineering, 2011, vol. 14, issue 08, 707-713

Abstract: This paper proposes and evaluates an innovative video-based method for measuring the trunk volume during respiration, using projected light and surface reconstruction. The method consists of the following main steps: (a) to project a grid of circular light markers on the anterior and posterior human body trunk surface during breathing, (b) to register the subject's trunk surface using two pairs of pre-calibrated digital video cameras, (c) to segment the video stream and track the projected markers using pre-processing techniques, morphological operators and detection algorithms, (d) to label the corresponding markers in the video sequences registered by each pair of stereo cameras, (e) to reconstruct the 3-D coordinates of all markers, (f) to reconstruct the surfaces from the unordered cloud of points using the Power Crust method and (g) to calculate the trunk volume in function of time using the divergence theorem. The evaluation of the method was based on two experiments. (1) Comparison of the volume of a trunk model (mannequin) by immersion and using the proposed optical method. (2) Analysis of the applicability of the method for measuring a subject’s trunk volume during a vital capacity respiratory manoeuvre. The results showed that the method was able to automatically measure more than 2000 projected points per image and to provide a very detailed representation of the subject's trunk. The relative accuracy of the volume measurement was estimated to be better than 3%. The analysis of the experiments revealed that signals coherent with the respiratory cycles could be identified through this method. In conclusion, the method based on light projection and surface reconstruction provides an accurate, non-invasive and useful means to calculate human trunk volumes during breathing.

Date: 2011
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
http://hdl.handle.net/10.1080/10255842.2010.493518 (text/html)
Access to full text is restricted to subscribers.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:taf:gcmbxx:v:14:y:2011:i:08:p:707-713

Ordering information: This journal article can be ordered from
http://www.tandfonline.com/pricing/journal/gcmb20

DOI: 10.1080/10255842.2010.493518

Access Statistics for this article

Computer Methods in Biomechanics and Biomedical Engineering is currently edited by Director of Biomaterials John Middleton

More articles in Computer Methods in Biomechanics and Biomedical Engineering from Taylor & Francis Journals
Bibliographic data for series maintained by Chris Longhurst ().