Traffic congestion measuring method and apparatus and image proc

Details Traffic congestion measuring method and apparatus and image proc Traffic congestion measuring method and apparatus and image proc

1998-07-10

1999-12-07

Johns, Andrew W.

Image analysis

Applications

Vehicle or traffic control

340934, 348149, G06K 900

Patent

active

059996358

ABSTRACT:
The present invention measures traffic congestion by utilizing a video camera to capture images of vehicles travelling on a road and analyzing sample points that are assigned to different aspects of the images. For example, presence and movement sample points correspond to the expected location and motion of the vehicles respectively. The sample points adjacent to one another form either movement or congestion blocks. The blocks that have a ratio of movement sample points to all other sample points within the block greater than a predetermined level are movement blocks. The remaining presence sample points in the images signify congestion sample points and form congestion blocks. Congestion blocks have a ratio of congestion sample points to all other sample points within the block greater than a predetermined level. Therefore, the state of traffic congestion is measured based upon the resultant movement and congestion blocks.

REFERENCES:
patent: 4214265 (1980-07-01), Olessen
patent: 4847772 (1989-07-01), Michalopoulos et al.
patent: 5301239 (1994-04-01), Toyama et al.
patent: 5402118 (1995-03-01), Aoki
patent: 5509082 (1996-04-01), Toyama et al.
patent: 5590217 (1996-12-01), Toyama
English translation of Internatioanal Preliminary Examination Report from WIPO.

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