Checkerboard marking failed

[zhanglei0715]

Hello, sir, your software is really great to use，It helps me a lot. I have a question to ask you during use. The checkerboard image I took can be previewed and the intersection can be found, but why does the software prompt me to fail when I calibrate the image. This problem has bothered me for a long time. I look forward to your help. Thank you.

[dicengine]

Are you able to upload a few of your calibration images? That would allow me to debug what's going on.