dicengine
how can I convert pixel units to millimeters
There is also a question about camera calibration. After my camera is calibrated, does it have to photograph the object to be measured in the calibrated posture?
To convert from pixels to mm you need to either be doing a stereo analysis or use calibration for a single camera. For either one, it's best not to move the camera once it has been calibrated. If you specify a calibration file, for mono or stereo, you will see a MODEL_COORDINATAES field in the exodus output file that will have the physical coordinates of the subset locations. You can use this to convert from px to mm (the SUBSET_COORDINATES field is in px for these same points)
For example, in this picture, I see the MODEL_COORDINATEES field in the exodus output file. How else can I convert it from px to mm?
The unit is in mm for MODEL_CORRDINATES if that's what you used in the calibration.
Sorry, I don't quite understand what you mean。Do you mean that as long as it is calibrated, the unit in MODEL_CORRDINATES will be mm?
Then the MODEL_COORDINATEES shown in the picture above is already in the calibrated exodus output file, so its unit is mm?
The units are set in the calibration. If millimeters were used in the calibration (which is most common), then the units in the MODEL_COORDINATES field will be in mm. For some applications, for example large-scale DIC, the units are set in meters.
How to obtain the result in physical units (mm) after calibration？I hope you can reply to me as soon as possible. Thank you.