ofxCv calibration artifacts

extend
#1

i am using ofxCv calibration and seeing artifacts in the undistorted images.
am i doing something wrong?

my settings.yml is set to 7x10 with 2.2cm squares.
i am using an A4 piece of paper.

thanks for any advise.

Screen Shot 2016-06-06 at 4.44.26 PM.png2555×1002 769 KB

#2

I’d recommend to use a more rigid support than a cardboard, maybe a thin piece of wood? The surface should be as planar as possible.

#3

thanks for the tip.
tried it, but still seems to have those artifacts

Screen Shot 2016-06-08 at 12.55.57 PM.png2559×1006 723 KB

#4

stillt he same problem

Screen Shot 2017-03-22 at 12.33.15 PM.png3201×1172 1.49 MB

Screen Shot 2017-03-22 at 12.33.15 PM.png792×543 181 KB

Calibrate fisheye lens - ofxCv
#5

use OF 0.9.8

fix this bug
https://github.com/kylemcdonald/ofxCv/issues/175

replace inside Calibartion.cpp
// int calibFlags = 0;
int calibFlags =CV_CALIB_FIX_PRINCIPAL_POINT | CV_CALIB_ZERO_TANGENT_DIST | CV_CALIB_FIX_FOCAL_LENGTH | CV_CALIB_FIX_ASPECT_RATIO | CV_CALIB_FIX_K3 | CV_CALIB_FIX_K4 | CV_CALIB_FIX_K5 | CV_CALIB_FIX_K6;