The proposed images in our database

The proposed images in our database were captured under different
the average accuracy of our VLP detection system is 94.12% and the proposed method is very robust to
illumination changes. Although running the region based filtering takes time, it increases the accuracy for both morphological
filtering and geometrical features by removing most non-plate edges. In order to highlight this property, some examples
of image edges before and after using the region-based filtering are shown in the Fig. 14. As can be seen in Fig. 8, in the image
enhancement section, Zheng’s method [5] is sensitive to real conditions such as long distance and high angle. In the detection
stage, although our accuracy is less than Zheng et al. [5] we believe our image database is more complicated. The performance
of two algorithms can be compared whenever they used exactly the same database. Fig. 15 shows some results of
the region-based procedure and the detected plates for several vehicle images in our database.