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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