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Author Topic: Distortion Coefficients  (Read 8353 times)

mwillis

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Distortion Coefficients
« on: September 13, 2011, 05:02:15 PM »
Hi, can anyone tell me if the K1, K2, P1, and P2 coefficients are expressed in pixels, microns, or mm? 

I am trying to convert from a known camera calibration to Agisoft's format.

Thank you,

Mark

Alexey Pasumansky

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Re: Distortion Coefficients
« Reply #1 on: September 13, 2011, 05:23:08 PM »
Hello Mark,

Distortion model used in Lens and PhotoScan is described in Lens Manual http://downloads.agisoft.ru/lens/doc/en/lens.pdf (last page).
Coefficients are expressed in inverse pixels.

Coefficients could be converted if the model of the original calibration you are using has the same transformation direction (from undistorted to distorted in PhotoScan/Lens). In other case conversion might be too complicated and even almost impossible.

You also can refer to the discussion where these parameters are mentioned - http://www.agisoft.ru/forum/index.php?topic=132.msg594#msg594
Best regards,
Alexey Pasumansky,
Agisoft LLC