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  Why is it a privilege to view vote counts?  




I can see upvotes/downvotes total in Stackoverflow.com. But the same information seems unavailable in other sites (meta.stackoverflow.com, programmers.stackexchange.com, other stackexchange sites).

What is the reason this feature is not enabled of other sites?


Question: How do I change the default checkerboard blocksize in OpenCV
Answer: OpenCV does not make any assumption on the physical size or the pattern size of your pattern.

That is, you can have any pattern with R rows and C columns.
It also doesn't matter if each block is 1 cm or 1 m.

The only thing you give to the calibrateCamera function is the objectPoints and imagePoints.

The array-dimensions (sizes) of these parameters corresponds to the number of corners of your pattern.

objectPoints should contain 3D coordinates (well, planar coordinates in your case, by setting Z=0) of your checkboard corners. These corners should be scaled to the physical size of your checkerboard. That is, if a corner has row-column index (3,1) and each block side is 3 cm then the 3D coordinate would be (0.09, 0.03, 0.00).