camera calibration

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Hi, To make sure I understand this correctly and by looking at calibrated images the following should be true: 1. I calibrate my camera as described in the camera calibration routines. 2. If I pulled a piece of string across my image field (plum). I would see the following: A straight image visually on my monitor, the pixel points that however make up that string will change and not be in a single physical row or column. The co-efficient s will take over and control of the re-mapped pixels in the display. This remapping is the wok of the co-efficient s during calibration.
This may be a very simplistic question, but is it true?? Thank You