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Against vertical Sobel operator that most license plate detection (LPD) algorithms adopt, this paper presents a robust and real-time preprocessing method to enhance both edge density and intensity of license plates under various outdoor and indoor environments. The proposed method applies HL subband feature of 2D discrete wavelet transform (DWT) twice to significantly highlight the vertical edges...
A novel approach is proposed for tracking occluded vehicles in real road traffic environment. The third-level DWT is inducted into background difference to filter the high frequency noises in the background, decrease the resolution of frame and detect motion regions. A scene model and a box adjustment model are built to help predict and interpret the occlusion and tracking procedure. A 2-dimensional...
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