In the results we report here, complex periodic and aperiodic illusions are revealed by filtering with filters containing one or more straight edges. Positive definite filters are used both in the frequency domain and in the space domain to reveal each illusion. Rotating slit and half-plane filters are used in the frequency domain, while processing is done in the spatial domain by convolution with a rotating slit. These two' schemes show similar results in revealing the illusory patterns. The implications for human visual processing are discussed.

The perception algorithm classify computer users. Test data was used to was collected interactively-from 5 users over a 5 week period. The times between keystrokes entered in a password formed the measurement vector.Decision functions were derived using part of the data (training data) to compute the weight vectors. The decision functions were applied to the remaining data (testing data) to classify the users. Four users were classified correctly with no error, and one user was misclassified with a 10IZO error resulting in an overall misclassification error of 270.

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