A new method to find five parameters of an ellipse from the optical Hough transform results is described. The method employs the Hough transform for detection of a straight line and the one-dimensional analysis of the resultant parameter domain. By using this algorithm, we simulated about the ellipses with different positions, and we obtained the information of the ellipse with 94% accuracy in the worst case. To compare the simulation results with the experimental results, we performed optical experiments by using a HT CGH filter. Through the experiments, we showed that our results were very similar to those ofthe simulation results.

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