Focal Length and Principal Point

Focal Length

Here is a visualization of the effect of the focal length to the perspective rays: as the focal length increases, the perspective rays converge more and more to parallel rays.

The Principal Point (green point) is kept constant at the image center (640/2, 480/2)=(320,240).

Principal Point

Here is a visualization of the effect of different locations of the principal point: as the principal point changes its position, the perspective projection rays change their orientation accordingly.

Only at the location of the principal point there is one perspective projection ray that is perpendicular to the image plane.

 
public/focal_length_and_principal_point.txt · Last modified: 2011/08/22 11:36 (external edit) · []
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