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### Messages - mirco

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##### General / Re: What units PS use for distortion parameters?
« on: May 12, 2012, 03:13:11 PM »
hello,

how can i use the tangential coefficients P1 & P2?? Are they used in the units of focal length, too? How i?ll convert them to use it in pixels or mm??

have you any idea??

ciao mirco

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##### Camera Calibration / use the radial and tangential distortion coefficients
« on: April 24, 2012, 08:43:50 PM »
hi,

i am a student working on a photogrammetry project for my thesis. i work
with a mobile-phone-camera with f4.3 .

for tests i wanted to use the results of your calibration program. i saw in
how to use the coefficients K1,K2 and K3

so, you wrote:
K1, K2, K3 are used in units of focal length and to convert them into mm or
pixels their values need to be divided by fx(in mm or pix)^2 for K1, fx^4
for K2 and fx^6 for K3.

my focal length (x) for example is 3116 (pix) and my radial coefficients
are k1: 0,14... k2: -0,60...   k3:0,72

is it right for k1: (0,14 / 3116)^2 or (0,14 / 3116^2) for example.

i am not really sure how to use the coefficients to get the right radial distortion.

thanks

mirco

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