Control points are specific features or markers with a precisely known location and identifiable in an image that are used as reference points for accurate measurement and alignment. Often, they are manually identified and marked in the images, which is a time-consuming and labor-intensive process. ArcGIS Reality Studio speeds up the process of measuring control points by effectively transferring initial manual image measurements to the rest of the image candidates. By automating this process, it saves time and ensures consistency in measurements across multiple images.