Size calibration and mapping in overhead camera view

Details Size calibration and mapping in overhead camera view Size calibration and mapping in overhead camera view

2011-01-25

2011-01-25

Aggarwal, Yogesh K (Department: 2622)

Television

Camera, system and detail

Combined image signal generator and general image signal...

C348S143000, C348S169000, C348S416100

Reexamination Certificate

active

07876361

ABSTRACT:
To calibrate images from an overhead camera, two equal-length reference lines at different heights relative to the floor plane are imaged. By comparing the resultant image-width of each of these lines in the view provided by the camera, the effective focal point of the camera is determined. In a preferred embodiment, a doorframe is used to provide equal-length lines at different heights parallel to the floor. The threshold of the doorway at the floor plane is used as a reference plane, and a parallel calibration line at a known/measured height in the doorway is defined. The image produced by a vertically oriented camera of these two equal length lines will show a longer line at the elevated position, the different widths of the images of these lines being dependent upon the camera's effective focal point. From these two projections of the equal-length lines at different heights, the camera's focal point distance from the reference floor plane is determined.

REFERENCES:
patent: 6414314 (2002-07-01), Ikeda
patent: 6687386 (2004-02-01), Ito et al.
patent: 6697104 (2004-02-01), Yakobi
patent: 2004/0179736 (2004-09-01), Yin

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