findChessboardCorners is NOT working for calibration images

Hey all,

I am giving some images as input to findChessboardCorners but it fails to detect the corners. I believe the calibration images are not very challenging for automatic corner extractions. Here are two sample images: http://vlm1.uta.edu/~doliotis/temp/opencv_calibration/9.bmp http://vlm1.uta.edu/~doliotis/temp/opencv_calibration/old_0.bmp

Any ideas why findChessboardCorners is failing? Are the squares too small? Thanks, Paul

p.s. I have verified that the function works with other images. I am using opencv 243

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Paul Doliotis
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I just found out that calling findChessboardCorners with these flags, seems to be working for all images:

found = findChessboardCorners( view, s.boardSize, pointBuf, CV_CALIB_CB_ADAPTIVE_THRESH | CV_CALIB_CB_FILTER_QUADS);

Hi, is it in c++ or python? I'm using python and I'm unable to detect any points at all.

atmadeep ( 2018-01-18 01:46:41 -0600 )edit

Asked: 2013-06-19 15:13:20 -0600

Seen: 4,485 times

Last updated: Jul 17 '13