image processing * Phong´s reflection model * video stabilization * borehole surface

Nowadays, ring-shaped light sources are very often used in combination with digital cameras. The presented paper analyses models of such light sources which are used for the illumination of the cylindrical surface. We can meet this situation e.g. when the borehole surface is monitored. As the motion of the camera is hand-controlled without any stabilization elements, resulting sliding motion is affected by strong instability. The purpose of this research is to eliminate the above-mentioned factors to reconstruct the borehole walls.