Digitally directed beams for three-dimensional surface reconstruction using a dynamical filter

A three-dimensional (3D) reconstruction method is proposed that utilizes an imaging system featuring digitally directed illumination beams, generated by a dynamical filter projected through an optical projector equipped with a digital micromirror device (DMD). This projector can digitally change the dynamical filter, thereby altering the directions of the illumination beams. The surface normal of the 3D object can therefore be obtained based on the law of regular reflection for each differently directed beam, and the surface shape can be reconstructed using an inverse matrix method. This method is experimentally validated using a cone with an apex height of 37 µm.