Error when using calibration

[1gen100]

Getting error when running the calibration for pictures that I have taken.

./calibrate -w 11 -h 16 -n 10 -s 0.015 -d "../calib_imgs/1/" -i "left" -o "cam_left.yml" -e "jpg"

Starting Calibration
OpenCV Error: Assertion failed (nimages > 0) in calibrateCamera, file /tmp/binarydeb/ros-kinetic-opencv3-3.3.1/modules/calib3d/src/calibration.cpp, line 3334
terminate called after throwing an instance of 'cv::Exception'
what(): /tmp/binarydeb/ros-kinetic-opencv3-3.3.1/modules/calib3d/src/calibration.cpp:3334: error: (-215) nimages > 0 in function calibrateCamera

Aborted (core dumped)

I used this code to take images:
rosrun image_view image_view image:=/kinect2/hd/image_color_rect

Because i wasn't able to use Kincet v2 with the read function.

[1gen100]

What worked for me was to make a code to take images and resize to 640x360 and save as "jpg" just the same size and type as the test images and using a chessboard with the same size as the test: 6x9 24.23mm
in the code you need to -1 with both the weight and height of the chessboard just as in the lines down here.

left:
./calibrate -w 5 -h 8 -n 10 -s 0.02423 -d "../calib_imgs/1/" -i "left" -o "cam_left.yml" -e "jpg"
right:
./calibrate -w 5 -h 8 -n 10 -s 0.02423 -d "../calib_imgs/1/" -i "left" -o "cam_left.yml" -e "jpg"

But now I have trouble with the calibrate_stereo function:
OpenCV Error: Assertion failed (scn == 3 || scn == 4) in cvtColor, file /tmp/binarydeb/ros-kinetic-opencv3-3.3.1/modules/imgproc/src/color.cpp, line 11111
terminate called after throwing an instance of 'cv::Exception'
what(): /tmp/binarydeb/ros-kinetic-opencv3-3.3.1/modules/imgproc/src/color.cpp:11111: error: (-215) scn == 3 || scn == 4 in function cvtColor

[1gen100]

I found a solution. Here I had my left files in folder 1 and my right files in folder 2, solve it by changing the right folder to "2".
./calibrate_stereo -n 7 -u cam_left.yml -v cam_right.yml -L ../calib_imgs/1/ -R ../calib_imgs/2/ -l left -r right -o cam_stereo.yml -e jpg

Conlusion:

• If the chessboard is 9x6 you should use 8 and 5 for the function. Look here
• Have all your images in one folder.
• and everthing should work fine ;)