Loading Image list error: cap_gstreamer.cpp (873), (616) & cap.cpp (164) & cap_images.cpp (253)

[JPark-91]

Hi, all

I am using OpenCV 4.5.4 version on Ubuntu 22.04.
This is my first time, so I am trying to practice the opencv by following this website:
https://docs.opencv.org/4.5.0/d4/d94/tutorial_camera_calibration.html

This example is about how to do camera calibration using XML ( I can tell )
So I copied camera_calibration.cpp file from https://github.com/opencv/opencv/blob/master/samples/cpp/tutorial_code/calib3d/camera_calibration/camera_calibration.cpp

I tried to use XML files, so
https://github.com/opencv/opencv/blob/master/samples/cpp/tutorial_code/calib3d/camera_calibration/in_VID5.xml
https://github.com/opencv/opencv/blob/master/samples/cpp/tutorial_code/calib3d/camera_calibration/VID5.xml

I guess my error is coming from here:
I am not sure how to put the right path in my case.

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From here, this is my working environment

[catree]

I don't have experience with the calibration tutorial code, but with the sample code: https://github.com/opencv/opencv/blob/4.x/samples/cpp/calibration.cpp

If you want to try it, here some instructions.

---

Build the OpenCV examples:

• use ccmake (to install use: cmake-curses-gui) to enable the build of the examples
• switch to ON the BUILD_EXAMPLES variable
• press c to configure
• press g to generate
• make -j8

Create the image list:

• in the OpenCV build folder, run ./example_cpp_imagelist_creator imagelist_opencv_left.yaml <path to>/opencv/samples/data/left*.jpg
• remove the left.jpg line since it is not a calibration image

Run the calibration:

• ./example_cpp_calibration --help for the help
• ./example_cpp_calibration -w=9 -h=6 -pt=chessboard -s=0.25 -o=opencv_left.xml imagelist_opencv_left.yaml
• read the code to understand the meaning of each parameter
• experiment with the other parameters

You should get your calibration file.