| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that while the degree of freedom is required for the installation or photographic circumstances of a camera in the case of recent number plate recognition, and it is necessary to secure recognition precision even under such conditions that the position or size of a number plate in a photographic image are instable, extraction processing costs are increased since various objects such as a background or road surface are photographed in those videos. SOLUTION: In the case of extracting a number plate by scanning a whole image by a prescribed retrieval region size, featured values are calculated in every vertical direction and horizontal direction with respect to an image, and a region with small featured values is discarded from a number plate candidate region. Also, the absolute value of a difference between the featured values of the vertical direction and horizontal direction is calculated, and the region with the large difference is discarded from the number plate region. Thus, it is possible to reduce the retrieval region, and to improve recognition performance and processing performance. COPYRIGHT: (C)2009,JPO&INPIT
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