OpenCV Q&A Forum - RSS feedhttp://answers.opencv.org/questions/OpenCV answersenCopyright <a href="http://www.opencv.org">OpenCV foundation</a>, 2012-2018.Mon, 20 May 2019 08:34:54 -0500Point correspondences for camera calibration using non-standard patternhttp://answers.opencv.org/question/213217/point-correspondences-for-camera-calibration-using-non-standard-pattern/So here's my hypothesis:
I plan to calibrate a camera (as a first step) using a non-checkerboard pattern. What I kind of hypothesise is using one marker point per image, for which I know exactly where it is located in 3D coordinates. So basically I have the (x,y) in camera coordinates and (X,Y,Z) in world coordinates. I then take a certain amount( say 30-40) images of the marker in different locations there by generating 30 image points and 30 world points.
Would the calibrateCamera method work in such a case? Any inputs?
Before anyone starts asking try it out, I do plan to try it out during the weekends when I get time off my university schedule. This question is just to get a head start by then.
Cheers,
SanjaySanjayKamathMon, 20 May 2019 08:34:54 -0500http://answers.opencv.org/question/213217/Finding the distortion coefficient and camera matrix : cvCalibrateCamera 2 error!http://answers.opencv.org/question/15104/finding-the-distortion-coefficient-and-camera-matrix-cvcalibratecamera-2-error/Hi,
I was trying to find out the camera matrix and distortion coefficients using cvCalibrateCamera2. There were no compilation errors, but when I am trying to execute the program it gives :
OpenCV error: Sizes of input arguments do not match( both matrices must have the same number of points) in cvConvertPointsHomogenous, file /build/buildd/opencv-2.3.1/modules/calib3d/src/fundam.cpp
size of the matrix storing object points in 4 x 3 and that of the matrix storing image points in 4 X2 , what could be wrong?
newbie111Thu, 13 Jun 2013 00:29:13 -0500http://answers.opencv.org/question/15104/2D pixel coordinate to 3D world coordinate conversionhttp://answers.opencv.org/question/13982/2d-pixel-coordinate-to-3d-world-coordinate-conversion/Hii I want to convert pixel coordinates from an image to real world 3D coordinates . I have used camera calibration using a chessboard and have found Rotation Matrix , Translation matrix , Intrinsic matrix . What should be my next step for conversion ?? Essentially I want the 3D projection of a pixel of an image . Is it possible ?? Please Explainsachin_rtSun, 26 May 2013 21:47:25 -0500http://answers.opencv.org/question/13982/