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camera calibration

asked 2018-02-21 20:09:16 -0500

Cucchi gravatar image

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

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answered 2018-02-21 22:01:00 -0500

Tetragramm gravatar image

I believe so yes. Any two parallel lines in real life should remain parallel in the image, if it is properly calibrated. Which means straight lines appear straight.

They don't necessarily all have to be in the same row or column of the image, but if you take the pixels that are part of the line, it should be very close to a straight line. Of course, not perfect because pixels are discrete, but close.

Here is a good slide deck on calibration.

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"Any two parallel lines in real life should remain parallel in the image, if it is properly calibrated."

Straight lines have to be straight. Parallel lines in the real world do not necessary need to be parallel in the images (e.g. a road).

Eduardo gravatar imageEduardo ( 2018-02-22 14:13:44 -0500 )edit

Oh, right. I think it's if the plane is parallel to the focal plane then?

Tetragramm gravatar imageTetragramm ( 2018-02-22 16:57:19 -0500 )edit

Yes, I think this is the case for any plane parallel to the focal plane.

Eduardo gravatar imageEduardo ( 2018-02-23 03:26:06 -0500 )edit

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Asked: 2018-02-21 20:09:16 -0500

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Last updated: Feb 21 '18