Image analysis – Applications – Vehicle or traffic control
Patent
1993-12-07
1996-04-16
Boudreau, Leo
Image analysis
Applications
Vehicle or traffic control
340917, 340934, 340937, G06K 900, G08G 107, G08G 1065, G08G 1017
Patent
active
055090826
ABSTRACT:
A video camera is placed so as to overlook vehicles' attitudes at an intersection and in the vicinity of the intersection. Video signals provided by the video camera are sent to the main body of a vehicles movement measuring apparatus. An A/D converting unit in the main body converts the video signals into digital data. Digital data in two frames, one of which is taken a certain length of time after the other, is stored in image memory units. Another image memory unit stores data of an input image including no vehicle image. An image data processing unit performs image processing on the data stored in the image memory units and extracts data about vehicles from the processed data. Information relating to speeds, tracking, etc., of vehicles is output from a data input-output unit. This processing of the obtained image data measures vehicles' movement as the degree of traffic jam or the smoothness of the downstream traffic flow on a road with detection of data regarding vehicles presence or speeds.
REFERENCES:
patent: 3195126 (1965-07-01), Barker
patent: 4847772 (1989-07-01), Michalopoulas
patent: 5161107 (1992-11-01), Mayeaux et al.
patent: 5283573 (1994-02-01), Takatou et al.
patent: 5296852 (1994-03-01), Rathi
Hasegawa Yuji
Toyama Masakazu
Bella Matthew C.
Boudreau Leo
Matsushita Electric - Industrial Co., Ltd.
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