Among these are a phase coding technique, a new type of binary hologram and a way of making continuous holograms.
Emphasis is given to holograms that are used in a filtering system with a large input format.
CGH's are widely used in optical filtering systems. However, due to the sampled nature of the CGH, several diffraction orders occur in the output plane. This may result in overlapping of different orders in the output plane if the size of the input object is large. This problem can be avoided by sampling the filter at a rate determined by the sum of the input size and the impulse response size. This is essentially an oversampling in the transform domain.