https://community.intel.com/t5/Intel-Integrated-Performance/Camera-calibration-error-using-zhang-s-method/m-p/785263#M1930 <P>Hi, </P><P></P><P>I am now using the openCv function's to do the Camera calibration. But all the distortion coefficient parameters are incorrect especially the radius distortion. k2 and k3 often be the value greater than1 while the focal length and principal point seem correct. I cannot explain the reason and Does anyone know the reason and help me to solve this problem? </P><P></P><P>The parameters below is my intrinsic parameters in one experiment under the windows size is (640*480),using 8-by-8 chessboard, the square size is 2 centimeter and all the chessboard corners can be found correctly. </P><P></P><P>k1=0.0796868 , k2=1.64119 , k3= -38.8437, p1=-0.00536427 , p2=-0.00200758 </P><P>principal point: 231.794 , 252.236 </P><P>focal length: 1062.22, 1055.18 </P><P></P><P>Thanks, </P><P></P><P>Jihang </P> Tue, 16 Nov 2010 01:36:59 GMT wangjihang88 2010-11-16T01:36:59Z https://community.intel.com/t5/Intel-Integrated-Performance/Camera-calibration-error-using-zhang-s-method/m-p/785263#M1930 <P>Hi, </P><P></P><P>I am now using the openCv function's to do the Camera calibration. But all the distortion coefficient parameters are incorrect especially the radius distortion. k2 and k3 often be the value greater than1 while the focal length and principal point seem correct. I cannot explain the reason and Does anyone know the reason and help me to solve this problem? </P><P></P><P>The parameters below is my intrinsic parameters in one experiment under the windows size is (640*480),using 8-by-8 chessboard, the square size is 2 centimeter and all the chessboard corners can be found correctly. </P><P></P><P>k1=0.0796868 , k2=1.64119 , k3= -38.8437, p1=-0.00536427 , p2=-0.00200758 </P><P>principal point: 231.794 , 252.236 </P><P>focal length: 1062.22, 1055.18 </P><P></P><P>Thanks, </P><P></P><P>Jihang </P> Tue, 16 Nov 2010 01:36:59 GMT https://community.intel.com/t5/Intel-Integrated-Performance/Camera-calibration-error-using-zhang-s-method/m-p/785263#M1930 wangjihang88 2010-11-16T01:36:59Z https://community.intel.com/t5/Intel-Integrated-Performance/Camera-calibration-error-using-zhang-s-method/m-p/785264#M1931 Hello,<BR /><BR />I would recommend you ask OpenCV related questions on <A href="http://opencv-users.1802565.n2.nabble.com/">OpenCV forum</A>. Intel Integrated Performance Primitives forum dedicated for IPP related topics.<BR /><BR />Regards,<BR /> Vladimir Tue, 16 Nov 2010 11:28:25 GMT https://community.intel.com/t5/Intel-Integrated-Performance/Camera-calibration-error-using-zhang-s-method/m-p/785264#M1931 Vladimir_Dudnik 2010-11-16T11:28:25Z