Image deblurring with computer generated double phase holograms

摘要

We explore a method of producing a deblurring filter developed by Hsueh and Sawchuk which uses two unit vectors in each cell of a computer generated hologram, to give on addition, both the amplitude and phase of the required filter function, the amplitude being scaled to be less than one. The resolution of such a filter is limited by the quantization errors in drawing the hologram. We suggest a method for reducing this error by reducing the amplitude contrast range of the filter, while maintaining its phase range. The filter is then backed with an amplitude only filter to correct for this reduction of the amplitude range. Experiments show a clear improvement in resolution in the second case. The original computer generated hologram filter has also been heterodyned to give a much increased space bandwidth product and used to deblur a large object.