Patent ID: 6298144
Filing Date: 2001-10-02
Classification: G06T,H04N

Abstract:
A method of detecting motion between a reference image and a test image, comprising the steps of:a) acquiring the reference image;b) acquiring the test image;c) aligning the reference image and the test image;d) dividing the reference image and the test image each into N.times.M blocks, where N and M are user-definable integers;e) masking a user-definable number of blocks of the reference image and the test image;f) differencing each pair of corresponding blocks in the reference image and the test image;g) median filtering each result of the last step;h) low-pass filtering each result of the last step;i) generating a normalized histogram for each result of the last step;j) generating a model of gaussian noise;k) calculating a distance between the model of gaussian noise and each result of step (i);l) comparing the results of the last step to a user-definable threshold; andm) determining that no motion has occurred between the reference image and the test image if a user-definable number of results of the last step where below the user-definable threshold, otherwise determining that motion has occurred between the reference image and the test image.