发明名称 |
Positional detector device for a vehicular license plate |
摘要 |
In a positional detector device for a license plate of a motor vehicle, a camera is provided to photograph a front and rear portion of a motor vehicle so as to produce an image signal. An A/D converter converts the image signal into a digital image. A positional detector detects a position of a lisence plate of a motor vehicle based on the digital image. A cut-off treatment device cuts off a specified region from an original image photographed by the camera while scanning the original image when the motor vehicle approaches the camera member within a predetermined distance. An edge refining treatment device emphasizes a contour of a pattern represented by the specified region cut off from the original image. A contraction treatment device contracts an image size of the specified region which was treated with the edge refining treatment device. A calculation treatment device feeds the contracted pattern to a learned neural network so as to calculate an output value for a positional detection neural network. A coordinate transformation device transforms the output value of the positional detection neural network to such a scale as to meet the original image. An addition treatment device adds data at specified points which were multiplied by Gaussian window so as to obtain a projective addition value after carrying out the coordinate transformation. A distinction treatment device recognizes a position of the license plate based on a maximum value on which the projective addition value falls.
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申请公布号 |
US6281928(B1) |
申请公布日期 |
2001.08.28 |
申请号 |
US19980076791 |
申请日期 |
1998.05.13 |
申请人 |
CHUO HATSUJO KABUSHIKI KAISHA |
发明人 |
UMEZAKI TAIZO;KANADE TAKEO;MATSUMOTO NORIYUKI |
分类号 |
G06T5/00;G06T7/00;(IPC1-7):H04N7/18 |
主分类号 |
G06T5/00 |
代理机构 |
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代理人 |
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