| Popis: |
In recent years, the foot sole anatomy has been used in applications such as footwear manufacturing, person identification, foot deformation and health care (Xiong S., et. al 2010). Typically, the foot sole shape is used to make profitable shoes (Lee Au E. Y., et. al 2007). Nowadays, several researches have been developed in computer vision to detect the foot sole. Methods such as multiple camera, photogrametry, laser trinagulation, fringe projection habe been used to determine the foot sole. The ligthings methods, compute the surface of foot sole based on the calibration via perspective projection. Thus, the calibration provides the vision parameters to compute the object surface. These lighting methods provide a smoothed surface of the foot sole and some details are not profiled (Chen M. J. L. et. al, 2003). Furthermore, these systems do not provide the fitting of the shoe sole mould to the foot sole. The laser line technique can be used to improve these matters. In this technique, the three-dimensional surface is computed based on laser triangulation and the calibration via perspective projection model (Zhou F., et. al, 2005). The calibration includes the measurement of the distances of the setup geometry, focal distance, camera orientation, pixel scale and image centre. Typically, the calibration is performed by an external procedure to the vision system. This procedure is carried out by the recognition of the calibrated references. Typically, the setup geometry is modified online. In this case, a recalibration is necessary to compute the three-dimensional surface (Wang G. et. al, 2004). But, the calibration references do not exist online and the calibration should be repeated. In this case, the perspective projection does not provide online re-calibration. |
