The Reference Checker is an automated process for checking the quality of point references. Since the quality and correctness of point references are key aspects in multi-photo projects, this system can considerably improve the overall accuracy, quality and robustness of your projects.
The Reference Checker runs automatically as one of the pre-processing stages (i.e. before the Processing Dialog appears). The Reference Checker even works with unoriented and unprocessed photographs making it ideal for catching referencing problems early.
The Reference Checker depends on the Project Marking Quality setting found in the Project Information Dialog. With this setting you tell the program how precisely marked you think the points are. A project with good quality sub-pixel points may have a Project Marking Quality between 0.5 and 1.0 pixels whereas a project of a natural object with some roughly marked points might have a Project Marking Quality has high as 10.0 pixels. A Project Marking Quality of -1.0 turns the Reference Checker off.
The concept behind the Reference Checker is to check photographs pair wise to determine if any points appear to be marked worse than the Project Marking Quality. There are situations where this cannot be determined (for instance if a pair of photos has fewer than 9 correctly referenced points between them).
The Reference Checker has a second stage that runs after Processing is complete. See the Second Stage Results section for more detail.