Detection method of an automobile number plate using optical rank order HMT

Ha-Woon Lee; Jung-Tag Gong; Jong-Chan Kim; Soo-Joong Kim

doi:10.1117/12.270356

27 March 1997 Detection method of an automobile number plate using optical rank order HMT

Ha-Woon Lee, Jung-Tag Gong, Jong-Chan Kim, Soo-Joong Kim

Proceedings Volume 3073, Optical Pattern Recognition VIII; (1997) https://doi.org/10.1117/12.270356
Event: AeroSense '97, 1997, Orlando, FL, United States

Abstract

A new method to detect an automobile registration plate using optical rank order hit-miss transform (HMT) is proposed. In this method, the optimal structuring elements are designed to recognize the corners of the registration plate and then they are applied to the optical rank order HMT. Optical rank order HMT gives better performance than the standard HMT in noisy or cluttered images. We present that whether the input images have random noise, clutter or not, the proposed method can easily detect automobile registration plates, and also when the detected plate have noise or clutter, they are presented after eliminating the noise or clutter from the detected plates by morphological opening and closing. Computer simulation shows the proposed method has good detection capability and we confirmed this by optical experiment.

Citation Download Citation

Ha-Woon Lee, Jung-Tag Gong, Jong-Chan Kim, and Soo-Joong Kim "Detection method of an automobile number plate using optical rank order HMT", Proc. SPIE 3073, Optical Pattern Recognition VIII, (27 March 1997); https://doi.org/10.1117/12.270356

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KEYWORDS

Image registration

Computer simulations

Structural design

Optical components

Computer generated holography

Optical correlators

Computing systems

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