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(11) | EP 0 403 193 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Method and apparatus for traffic monitoring |
| (57) A method of traffic monitoring is described which comprises forming at least first
and second scene images of a scene in which traffic may be present, the images being
formed at instants of time separated by a time interval. At least one of the first
and second scene images is processed to form an edge image representing the occurrence
of edges in the scene, and a determination is made on the basis of the edge image
of the presence or absence, and spatial location, of traffic in the scene. A difference
image is formed in which each pixel represents the difference between the intensity
of the pixels of the first and second scene images at the corresponding point in the
image, and a determination is made from the distribution of pixels of different intensities
in the difference image of the presence or absence of movement in the scene. |