question about CalibrateCamera2

tang1102 — Thu, 24 Aug 2006 15:36:22 GMT

I find some problem of CalibrateCamera2(), I think the coordinates of 3D object points CvMat* object_points and their correspondent 2D projections CvMat* image_points isn't correspondent. If I set the CvMat* object_points correspondent to CvMat* image_points the result is wrong, could you give me some more information about this function,e.g. the coordinate system of image and object applied in this fuction or the right correspondent sample of CvMat* object_points and CvMat* image_points.

Re: question about CalibrateCamera2

Intel_C_Intel — Thu, 24 Aug 2006 23:10:32 GMT

Actually, here I just rephrase what's writtein in the OpenCV reference manual. object_points is array of the feature points of the calibration patern in the pattern coordinate space. The array is duplicated as many times, as the number of the pattern views captured. For example, if the pattern is planar, such as the checkerboard, X and Y axes are usually set parallel to the board sides with the coordinate origin at one of the board corners, and Z axis is orthogonal to the board plane. In this case object_points is{(X_k,Y_k)=(square_size*(k mod ), square_size*(k / )}. image_points is the projection of the object_points to the image view. It should be retrieved using a specialized algorithm, such as cvFindChessboardCorners. There is see opencv/tests/cv/src/acameracalibration.cpp, opencv/filters/calibfilter/calibfilter.cpp and opencv/cvaux/src/cvcalibfilter.cpp for examples how to use cvCalibrateCamera2. There will be also a simple example added to opencv/samples/c/ that wil demonstrate the function use.

topic question about CalibrateCamera2 in Intel® Integrated Performance Primitives

question about CalibrateCamera2

Re: question about CalibrateCamera2