PC-based Moire for field studies on the human body surface

Haymo Kurz

doi:10.1117/12.2294379

1 August 1990 PC-based Moire for field studies on the human body surface

Haymo Kurz

Proceedings Volume 1395, Close-Range Photogrammetry Meets Machine Vision; 13953S (1990) https://doi.org/10.1117/12.2294379
Event: Close-Range Photogrammetry Meets Machine Vision, 1990, Zurich, Switzerland

Abstract

A projected moire method was realized with image analysis software on a PC/framegrabber configuration. A CCD camera was used for evaluation of paper prints, transparencies or film negatives obtained from photographic moire. Video sequences could be studied using a camcorder and slide projector. The resolution of the CCD was sufficient for a static depth resolution between moire fringes of 10 mm in a field of 60x40 cm. Steps of image analysis were: multiplication of reference grid with distorted line picture, Sobel filtering, unidirectional mean filter. Anatomical landmarks, or predefined points on the moire fringes were marked interactively; from the binarized image, coordinates were extracted directly, or transferred to AutoCAD. 3-D reconstructions and measurements of fringe curvature thus became possible. The method's reduced sensitivity makes it robust, versatile and inexpensive, but quite capable of quantitative studies on the body surface, with the subject in a position at will. Examples are given for the documentation and evaluation of postural problems of musicians, of children at ballet school, and of physiotherapy.

Citation Download Citation

Haymo Kurz "PC-based Moire for field studies on the human body surface", Proc. SPIE 1395, Close-Range Photogrammetry Meets Machine Vision, 13953S (1 August 1990); https://doi.org/10.1117/12.2294379

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