# Training Image Coordinate System and Calibration

If the training and run-time images have different coordinate systems or calibrations, then identical patterns in the run-time images will be found at different scale or angle than the trained pattern.

For example, if the same optical and mechanical configurations are used to acquire training-time and run-time images, but the training-time image selected coordinate space units are one half the size of the run-time image selected coordinate space units, the pattern in the run-time image will be found at a scale of 0.50.

You should make sure that the same calibration has been computed for both pattern training and run-time images. If you have not calibrated the pattern training and run-time images, then you should make sure that the optical and mechanical configurations used to acquire the images are the same.