Topography Moire using phase stepping method with CCD camera

Dorota Zawieska

doi:10.1117/12.2294398

1 August 1990 Topography Moire using phase stepping method with CCD camera

Dorota Zawieska

Proceedings Volume 1395, Close-Range Photogrammetry Meets Machine Vision; 13954B (1990) https://doi.org/10.1117/12.2294398
Event: Close-Range Photogrammetry Meets Machine Vision, 1990, Zurich, Switzerland

Abstract

Moire projection method enables non-contact measurement of the shape or deformation of different surfaces and constructions by fringe pattern analysis. The fringe map aquisition of the whole surface of the object under test is one of the main adventage comparing with "point by point" methods. The computer analyzes the shape of the whole surface and next user can select different points or cross sections of the object map. Instananeous image recoquition gives another advantage, measurement of transient events e.g. during technical process. In this paper will be presented a few typical examples of an application of the moire projection techique in solving different medical problems. Equipment for determining posture defects using moire projection onto a CCD camera will be described. Because the analysis of moire images by conventional methods is tedious the moire fringe is digitized and analysed in real time using a phase stepping method. The technique has been applied experimentally for the analysis of osseo-muscular deformities. For this purpose the equipment was installed in The Rehabilitation Clinic for Children and Youth in Katowice.

Citation Download Citation

Dorota Zawieska "Topography Moire using phase stepping method with CCD camera", Proc. SPIE 1395, Close-Range Photogrammetry Meets Machine Vision, 13954B (1 August 1990); https://doi.org/10.1117/12.2294398

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