Camera Calibration in 2D DIC

I tried to calibrate the images with Camera calib tool in software, The auto corner extraction some times work and some times not, what are the guidline for calibration target images, how can we implement the calibration result into 2d DIC results.

There are 2 possible reasons

Tthe calibration function doesn't work because:
- The number of inner rows and column are incorrect
-The image may be blurred that some corners can't be detected.

2D DIC does not need camera calibration

Only 3D DIC needs it.

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