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The space-variant optical information processing can be performed through spatialfiltering of transforms other than Fourier transform.One of the authors and coworkershave demonstrated that the general optical linear transforms can be realized withholographic lenses systems,and such system can be obtained by the iterative method.Walsh transform is an important linear transform,some authors applied it to optic-al problems such as image improvement,but they rcalized Walsh transform with electr-onic computers.The realization of Walsh transform with optical methods is one of the
The space-variant optical information processing can be performed spatial filtering of transforms other than Fourier transform. One of the authors and coworkershave demonstrated that the general optical linear transforms can be realized withholographic lenses systems, and such systems can be obtained by the iterative method. Walsh transform is an important linear transform, some authors applied it to optic-al problems such as image improvement, but they rcalized Walsh transform with electro- onic computers. The realization of Walsh transform with optical methods is one of the