Geometric correction and image de-warping
The two following images show the effect of placing the camera at an angle to the target, resulting in the squared grid becoming a diamond shape. Notice the original shadowing. In the right image the distortion is corrected by software.
The next image shows the distorted effect when a label attached to a cylindrical container needs to be inspected. The label is first de-warped in software, simplifying the demand on the inspection using OCR.