Image geometric distortion self-calibration method under any orientation condition

• Main Authors: WANG SHITAO, FANG XUEQING, LU XING, PENG QINGYU
• Format: Patent
• Language: Chinese; English
• Published: 05.04.2024
• Subjects: CALCULATING; COMPUTING; COUNTING; GYROSCOPIC INSTRUMENTS; IMAGE DATA PROCESSING OR GENERATION, IN GENERAL; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING DISTANCES, LEVELS OR BEARINGS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; NAVIGATION; PHOTOGRAMMETRY OR VIDEOGRAMMETRY; PHYSICS; SURVEYING; TESTING

The invention discloses a self-calibration method for geometric distortion of an image under any orientation condition, which relates to the technical field of celestial body measurement and comprises the following steps of: obtaining an astronomical image pixel coordinate (x0, y0) based on an image obtained by jitter observation; obtaining a celestial coordinate (# imgabs0 #) in the reference star catalogue, and obtaining a matching list of (# imgabs1 #) and (x0, y0); obtaining a standard coordinate theoretical value corresponding to the celestial coordinate through cardiographic projection; subtracting the current distortion from the pixel coordinates of the astronomical images to obtain observation position pixel coordinates, fitting parameters of a four-constant model in combination with a standard coordinate theoretical value, calculating a standard coordinate observation value corresponding to each astronomical image, and further obtaining a residual error of each astronomical image under the standard c