Update README.md
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@ -297,6 +297,7 @@ If you already have a calibration file, set `calibration_type` type to `convert`
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- Make sure that the board:\
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is filmed from different angles, covers a large part of the video frame, and is in focus.\
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is flat, without reflections, surrounded by a white border, and is not rotationally invariant (Nrows ≠ Ncols, and Nrows odd if Ncols even).
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- A common error is to specify the external, instead of the internal number of corners. This may be one less than you would intuitively think.
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<img src="Content/Calib_int.png" width="600">
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