Multiwavelet transform based license plate detection

The presented framework uses the localization concept of multiwavelet transform and empirical mode decomposition (EMD) to locate number plate from vehicle. Multiwavelet transform is similar to wavelet transform but unlike wavelet, it simultaneously provides orthogonality, symmetry, short-support and vanishing moment. Multiwavelet is used to decompose the image and EMD helps to find the actual wave crest from the projected information provided by multiwavelet transform. The effectiveness of the proposed algorithm is improvised using pre- and post-processing steps which include image enhancement and skew correction respectively. Proposed algorithm has also been tested on single and double line number plate. The performance of the proposed algorithm has been tested on various countries' number plates like Croatia, Austria, France, India and Greece, and in various conditions like shadow, dirt and blurry. Proposed algorithm has detected number plate with high accuracy and in relatively less time.