Endoscope Measurement Marker Calibration for Optical Distortion

The patent performs preliminary calibration by capturing images of a chart with known geometry at multiple positions across the field of view. These calibration images are used to pre-calculate distortion correction parameters and create a lookup table or transformation model that compensates for optical distortion. This preliminary action enables accurate measurement without real-time complex calculations during actual measurement operations.

The patent introduces an intermediary calibration chart with known geometric features as a mediator between the optical system and the measurement process. By capturing images of this chart at various positions and using its known geometry to derive distortion characteristics, the system creates an intermediary reference that enables correction of peripheral distortion without requiring complex real-time optical modeling.

The system performs calibration at multiple distances in advance and stores the calibration data for rapid retrieval during measurement. By pre-computing distortion correction parameters at multiple distances and storing them in a lookup table or database, the system eliminates the need for real-time multi-distance calibration during actual measurement, thus reducing time loss while maintaining precision across different observation distances.

The patent creates copies of calibration data for different distances and stores them for rapid access. Instead of performing time-consuming calibration calculations each time measurement is needed, the system creates pre-computed copies of calibration information at multiple distances, allowing quick selection and application of appropriate calibration data based on the current observation distance.