openCV Python相机校准-作物和投资回报率

Question

I am using OpenCV-Python to correct lense distortion on pictures. I use the script given in this tutorial .

If I apply the script on the picture provided by the author of the script, its working.

However, if I use my own picture, I can either get a ROI = (0,0,0,0) or a ROI such that the crop is not good.

I don't understand why. I don't know what to do :./

• Is there a specific way to take picture of the chessboard?
  • chessboard should be close/far from the camera?
  • I should take several pictures?
  • the camera should not move?
• Should I define the size of my chessboard square somewhere?

Thank you in advance for your answer.

M.

Answer 1

Ok, finally it works now, and I'll answer my own question ^^

• Is there a specific way to take picture of the chessboard?

  • chessboard should be close/far from the camera?

    --> The chessboard should be close to the picture edges.

  • I should take several pictures?

    --> At least 10 if not 20

  • the camera should not move?

    --> It could move

• Should I define the size of my chessboard square somewhere?

  --> Apparently not, but it is better if the chessboard is not a square (eg 9x9 little square, it is better to have a 4x8 chessboard).

  --> Still, I don't know the answer of this question

Remarkable things I noticed:

• The pictures should have same orientation (landscape)
• The cropped picture does not have necessarily the same dimension than the original one

Thank you myself :D