camera_calibration cameracalibrator.py buttons are disabled

asked 2012-10-02 03:00:06 -0600

aldo85ita
252 ●17 ●18 ●31

Hi everybody! I'm trying to do a monocular camera calibration with camera_calibration package (http://www.ros.org/wiki/camera_calibration). I can start "cameracalibrator.py" but the buttons "CALIBRATE","SAVE" and "COMMIT" are disabled. See: image description

So I can't do the calibration.

These are my commands:

export GSCAM_CONFIG="v4l2src num-buffers=-1 device=/dev/video1 caps=\"video/x-raw-yuv,width=640,height=480,format=(fourcc)YUY2\" ! ffmpegcolorspace"
roscd gscam
cd bin
rosrun gscam gscam &
rosrun camera_calibration cameracalibrator.py --size 9x7 --square 0.039 /image:=gscam/image_raw &

And these are the node connections: image description

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answered 2012-10-02 06:54:55 -0600

aldo85ita
252 ●17 ●18 ●31

I find the fault!! I set the inner squares inside the checkboard (9x7) instead of the inner corners (8x6). So the right command is:

rosrun camera_calibration cameracalibrator.py --size 8x6 --square 0.039 /image:=gscam/image_raw

Thankyou however

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answered 2012-10-02 04:46:41 -0600

Dan Lazewatsky
9115 ●79 ●103 ●160 http://dan.lazewatsky.com/

The buttons are disabled until you've captured enough samples to calibrate.

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You need also different enough samples: try to move your camera or the calibration pattern around. Especially try different levels of zoom and place it around the corners of your image with different orientations...

Thomas ( 2012-10-02 05:01:50 -0600 )edit

worked for me i used the same chessboard print as used here. colorful lines appear on chessboard(actual boxes:9x7). the calibrate button appears only after sufficient(20-25) pics are taken from the video stream. it takes some time to turn blue from grey. when u click the calibrate button then save button will turn blue ,click it and the see the address(in terminal window) where camera calibration result data is saved.(maybe in zip format) extract the zip and you will see there some photos and the yaml file. the yaml file contain the calibration parameters for your camera.