Under coherent illumination, the interference between signal and noise produces an amplification of the noise. That is why image processing by optical methods may be done better with incoherent light than with coherent light. A method is described where image deblurring is performed in spatially incoherent illumination. The two main features are an additional step of illuminance subtraction to simulate negative intensities, and the use of computer-generated holograms of a low number of cells.
© 1976 Optical Society of America
P. Chavel and S. Lowenthal, "A method of incoherent optical-image processing using synthetic holograms*," J. Opt. Soc. Am. 66, 14-23 (1976)