Title:
車両およびそれらのナンバープレートを同時に撮像するシステム
Document Type and Number:
Japanese Patent JP4209593
Kind Code:
B2
Abstract:
A vehicle video imaging system comprises a white-light LED array for illuminating reflective painted parts of a vehicle's license plate, a powerful flash with a visual spectrum cutout filter and a polarizing filter for illuminating any non-reflective license plate paint and the vehicle itself. A video camera with a polarizing filter turned 90 DEG relative to the one in front of the flash receives the illuminated image of the vehicle and its license plate. The reflective paint of a license plate will return polarized light as it is received, so the white-light LED array will provide all the illumination needed by the camera to get a good high-contrast picture of the license plate. The polarizing filters will combine to block out most of the light from the flash that was returned still-polarized by the reflective-paint license plate. All other surfaces that do not have reflective paint will bounce-back and scatter the light from both the polarized flash and white-light LED array.
Inventors:
James Francis Oves
Application Number:
JP2001003678A
Publication Date:
January 14, 2009
Filing Date:
January 11, 2001
Export Citation:
Assignee:
PULNIX AMERICA,INC.
International Classes:
G03B15/00; G03B15/02; G03B15/05; G08G1/017; G08G1/054; H04N5/225; H04N5/238; H04N7/18
Domestic Patent References:
| JP1276385A | ||||
| JP3090979A |
Foreign References:
| US4731854 |
Attorney, Agent or Firm:
Shinichi Iizuka
Shoichi Kadoma
Shoichi Kadoma