Fourier domain phase retrieval for 2D image frames

摘要

An iterative method of retrieving phase information in the Fourier domain representative of a current (nth) frame from a sequence of 2D image frames, the method comprising using at least one parameter related to retrieval of phase information in the Fourier domain of the previous (n-1th) frame as a starting point for the iterative method. The parameter used may be Fourier domain phase information, Fourier domain amplitude information or gain/attenuation control parameters. By using parameters related to retrieval of phase information for the previous frame, phase information for the current frame may be derived via an iterative process. The phase information thus retrieved may be used to drive a phase-modulating spatial light modulator (SLM) to display data representative of a Fourier transform of the current frame. This frame is inverse-transformed into the spatial domain using a Fourier transform lens, which enables a holographic reconstruction to be formed at a replay field for viewing by a viewer. The display of images so formed may be implemented in a projector display system such as a head-up or head-mounted display.