|
|
|
|
|
|
|
|
|
|
|
|
View
transformations for efficient, vision-based, traffic monitoring |
|
Brief description |
Advances
in machine vision techniques have led to algorithms and integrated systems
that can be applied in transportation engineering to improve surveillance and
control. Despite these advances, certain problems in the effective
integration of machine-vision based systems at complex intersections and
complex freeway sections still remain.
These are related to increasing system performance in the
identification, analysis and detection of the traffic state in real
time. This work examines the
feasibility of providing transformed visual input to existing machine-vision
based systems, in order to gain increased efficiency and cost-effectiveness
of integrated transportation systems. Two transformations are developed, homography-based transformation and panoramic image reprojection. Homography-based transformation operates on video of the road scene,
provided by classical cameras, and seeks to transform any view to a top-down
view. This transforms the three-dimensional
problem of image analysis for, e.g., road event detection to a
two-dimensional one. Panoramic
image
reprojection employs panoramic cameras to reduce required
hardware, and the complexity and cost incurred in obtaining the desired road
view. The image re-projection technique allows the reconstruction of
undistorted,
perspectively correct views from panoramic images in real time. Tests at sites
in |
|
|
Contributions |
Eleytheria Tzamali, Antonis Argyros |
|
|
Sample results |
|
|
|
Oblique view of traffic ( |
Transformed, top-down view of
the left view |
|
|
|
|
|
|
Panoramic view of traffic ( |
Transformed,bird-ey view of the
left view |
|
|
Related publications
and documents |
·
E. Tzamali, G. Akoumianakis, A.A. Argyros, Y. Stephanedes, “Improved Design for Vision-based
Incident Detection in Transportation Systems Using Real-Time View
Transformations”, Journal of
Transportation Engineering, American Society of Civil Engineers, in press. The electronic versions of the above publications can be downloaded
from my publications
page. |
|
|
Last update |
29 August 2006,
Antonis Argyros, argyros@ics.forth.gr |
|
|
|
|
|
|
|
|
|
|
|