A binary coded grating with error diffusion and its application in 3D sensing

摘要

With the development of computer technology and CCD sensor, 3D sensing with sinusoidal structure illumination are widely used. To obtain the shape information of a 3D object, a procedure called spatial modulation is performed. In most practical methods usch as PMP, FTP, SPD or MMP, sinusoidal structured illumination is utilized as the carrier of spatial modulation, and the quality of it plays an important role in the measurement result. But it is very difficult to produce a perfect sinusoidal grating. The idea of Error Diffusion algorithm is first used to produce a better sinsoidal illumination structure. 1D and 2D sinusoidal module is designed. A computer simulation system base on PMP mdoel is established to implement Error Diffusion modulation to structured light field. Computer simulations have verified the efficiency of Error Diffusion grating.