diff --git a/README.md b/README.md index f6d995a..3472570 100644 --- a/README.md +++ b/README.md @@ -297,6 +297,7 @@ If you already have a calibration file, set `calibration_type` type to `convert` - Make sure that the board:\ is filmed from different angles, covers a large part of the video frame, and is in focus.\ is flat, without reflections, surrounded by a white border, and is not rotationally invariant (Nrows ≠ Ncols, and Nrows odd if Ncols even). + - 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.