In this paper, a new block-wise algorithm is proposed for Iranian license plates location. The proposed algorithm uses the density of vertical edges (DVE) in the license plate region as a feature for detecting the candidate license plates. It employs the quad-tree decomposition algorithm to adjust the size of the blocks used for computing local DVEs. According to the experimental results, the algorithm is fairly robust against variations of imaging geometry (e.g. scale and orientation) and illumination conditions. Furthermore, the proposed algorithm provided better performance compared to a well-known method while it was significantly more efficient.

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