Removed Sphinx documentation files
This commit is contained in:
@@ -1,62 +0,0 @@
|
||||
.. _CameraCalibrationSquareChessBoardTutorial:
|
||||
|
||||
Camera calibration with square chessboard
|
||||
*****************************************
|
||||
|
||||
.. highlight:: cpp
|
||||
|
||||
The goal of this tutorial is to learn how to calibrate a camera given a set of chessboard images.
|
||||
|
||||
*Test data*: use images in your data/chess folder.
|
||||
|
||||
#.
|
||||
Compile opencv with samples by setting ``BUILD_EXAMPLES`` to ``ON`` in cmake configuration.
|
||||
|
||||
#.
|
||||
Go to ``bin`` folder and use ``imagelist_creator`` to create an ``XML/YAML`` list of your images.
|
||||
|
||||
#.
|
||||
Then, run ``calibration`` sample to get camera parameters. Use square size equal to 3cm.
|
||||
|
||||
Pose estimation
|
||||
===============
|
||||
|
||||
Now, let us write a code that detects a chessboard in a new image and finds its distance from the camera. You can apply the same method to any object with known 3D geometry that you can detect in an image.
|
||||
|
||||
*Test data*: use chess_test*.jpg images from your data folder.
|
||||
|
||||
#.
|
||||
Create an empty console project. Load a test image: ::
|
||||
|
||||
Mat img = imread(argv[1], IMREAD_GRAYSCALE);
|
||||
|
||||
#.
|
||||
Detect a chessboard in this image using findChessboard function. ::
|
||||
|
||||
bool found = findChessboardCorners( img, boardSize, ptvec, CALIB_CB_ADAPTIVE_THRESH );
|
||||
|
||||
#.
|
||||
Now, write a function that generates a ``vector<Point3f>`` array of 3d coordinates of a chessboard in any coordinate system. For simplicity, let us choose a system such that one of the chessboard corners is in the origin and the board is in the plane *z = 0*.
|
||||
|
||||
#.
|
||||
Read camera parameters from XML/YAML file: ::
|
||||
|
||||
FileStorage fs(filename, FileStorage::READ);
|
||||
Mat intrinsics, distortion;
|
||||
fs["camera_matrix"] >> intrinsics;
|
||||
fs["distortion_coefficients"] >> distortion;
|
||||
|
||||
#.
|
||||
Now we are ready to find chessboard pose by running ``solvePnP``: ::
|
||||
|
||||
vector<Point3f> boardPoints;
|
||||
// fill the array
|
||||
...
|
||||
|
||||
solvePnP(Mat(boardPoints), Mat(foundBoardCorners), cameraMatrix,
|
||||
distCoeffs, rvec, tvec, false);
|
||||
|
||||
#.
|
||||
Calculate reprojection error like it is done in ``calibration`` sample (see ``opencv/samples/cpp/calibration.cpp``, function ``computeReprojectionErrors``).
|
||||
|
||||
Question: how to calculate the distance from the camera origin to any of the corners?
|
Reference in New Issue
Block a user