Camera calibration problem AR.Drone 2.0

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Thanks for the reply. The problem is that the front camera is terrible. I tried to calibrate using the checkerboard method but the camera could not detect it. I was doing it correctly because I got it working on my webcam so the only problem could be the front camera.

I basically get double images and it looks quite transparent. If I take a snapshot using the app on the phone, it shows a clear image so the camera must not be broken...

When you will be calibrating specify it as a parameter for the calibration package i.e. rosrun camera_calibration cameracalibrator.py --size 8x6 --square 0.108 image:=/ardrone/front/image_raw camera:=/ardrone/front/

Hi, I tried an A4 size check board that was detected when using the webcam. When I changed the camera to the ardrone feed, it would not draw the dots and lines on the checkerboard. What size checkerboard do you recommend?

We used two kinds of calibration patterns, the big one 0.108 and the small one (If am not mistaken 0.024) on A4 paper. It is strange that you pass the same parameters for the webcam and it is detected. Can you check that the parameter are the same.

I ran: rosrun camera_calibration cameracalibrator.py --size 6x6 --square 0.024 image:=/camera/image_raw camera:=/camera for my webcam and: rosrun camera_calibration cameracalibrator.py --size 6x6 --square 0.024 image:= /ardrone/front/image_raw camera:=/ardrone/front for the AR.Drone.

Where did you get the pattern 6 by 6? If the number of comers will not fit the number you pass as a parameter, the board will not be detected.

The checkerboard was a 9x7 board printed on A4 but i folded it so it was a 7x7. The 6x6 refers to the number of inner corners.