Patent ID: 6281928
Filing Date: 2001-08-28
Classification: G06T

Abstract:
A positional detector device for a license plate of a motor vehicle comprising:a camera member which photographs a front and rear portion of a motor vehicle so as to produce an image signal;an A/D converter which converts the image signal into a digital image;a positional detector member which detects a position of a lisence plate of a motor vehicle based on the digital image;a cut-off treatment member which cuts off a specified region from an original image photographed by the camera member while scanning the original image when the motor vehicle approaches the camera member within a predetermined distance;an edge refining treatment member which emphasizes a contour of a pattern represented by the specified region cut off from the original image;a contraction treatment member which contracts an image size of the specified region which was treated with the edge refining treatment member;a calculation treatment member which 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 member which transforms the output value of the positional detection neural network to such a scale as to meet the original image;an addition treatment member which 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; anda distinction treatment member which recognizes a position of the license plate based on a maximum value on which the projective addition value falls.