Universitat de Valencia - Burjassot. Constantino F. Mugarra Gonzalez Facultat de Fisica. It is based on taking two or more images from different points of view, making afterwards a 3D reconstruction.
Commercial systems tend to use infrared sources of light, increasing the total cost of the system.
The method proposed has no need of infrared beams or reflectors, hence reducing the complexity of the involved devices. Infrared light sensors are also very sensitive to changes on the reflection angle, leading to increasing problems when measuring dynamic images. Visible light simplifies the patient preparation, and allows using non-invasive marks. Light used is centered in violet for better image thresholding. When two images for stereo vision are taken they are shrank to obtain the points that better represent the marks.