Vehicle movement measuring apparatus
First Claim
1. A vehicles movement measuring apparatus comprising:
- a video camera, oriented to face in a direction corresponding to a downstream direction of traffic flow along a road, for outputting first video signals indicative of a first video imaging area of said road and second video signals indicative of a second video imaging area of said road, said first and second video imaging areas being spaced apart from one another and said first video imaging area being located closer than said second video imaging area to said video camera;
A/D converting means for converting said first and second video signals of said first and second video cameras into first and second digital image data;
a plurality of image memory means for separately storing said first and second digital image data, wherein a first one of said plurality of said image memory means stores said first digital image data, and a second one of said plurality of said image memory means stores said second digital image data; and
image processing means for processing, in response to passage of time, (i) said first digital image data stored in said plurality of image memory means so as to provide data on presence and movement of vehicles within said first imaging area and (ii) said second digital image data stored in said plurality of image memory means so as to provide data on a degree of traffic jam within said second imaging area.
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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.
130 Citations
15 Claims
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1. A vehicles movement measuring apparatus comprising:
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a video camera, oriented to face in a direction corresponding to a downstream direction of traffic flow along a road, for outputting first video signals indicative of a first video imaging area of said road and second video signals indicative of a second video imaging area of said road, said first and second video imaging areas being spaced apart from one another and said first video imaging area being located closer than said second video imaging area to said video camera; A/D converting means for converting said first and second video signals of said first and second video cameras into first and second digital image data; a plurality of image memory means for separately storing said first and second digital image data, wherein a first one of said plurality of said image memory means stores said first digital image data, and a second one of said plurality of said image memory means stores said second digital image data; and image processing means for processing, in response to passage of time, (i) said first digital image data stored in said plurality of image memory means so as to provide data on presence and movement of vehicles within said first imaging area and (ii) said second digital image data stored in said plurality of image memory means so as to provide data on a degree of traffic jam within said second imaging area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification