Target control point-based satellite CCD array image geometric calibration method

Abstract

The invention discloses a target control point-based satellite CCD array image geometric calibration method. The method comprises the following steps: based on target characteristic information, extracting to obtain the precise position of a target center point, and using the precise position as coordinate information of a target control point; calculating according to the obtained coordinate information of the target control point to obtain a set over matrix RU; introducing the obtained set over matrix into a strict imaging geometry model, and using the coordinate information of the target control point to solve camera distortion parameters to complete satellite CCD array geometry calibration. Through the adopted technical scheme, systematic installation error of external attitude measurement equipment and camera equipment in the satellite imaging process can be well eliminated, distortion error parameters containing physical sense inside a camera can be accurately calculated, positioning and internal geometry precision of an image system can be improved, the geometry quality of a satellite image can be improved, and follow-up processing application is facilitated.

Description

technical field [0001] The invention belongs to the technical field of photographic imaging surveying and mapping, and in particular relates to a method for geometrically checking satellite CCD array images based on target control points. Background technique [0002] The geometric accuracy of satellite imagery is an important basis for subsequent applications, and the geometric accuracy directly represents the location accuracy of image features. If the geometric accuracy of satellite images is low, a large number of control points will be required for correction during subsequent image processing, which requires a lot of manpower, material and financial resources, which will lead to a decrease in image sales. [0003] At present, the domestically-developed domestic satellites have improved in terms of image visual effects and radiation quality, but there is still a large gap in geometric quality compared with similar foreign satellites. For example, the positioning accura...

AI Technical Summary

Problems solved by technology

However, for a certain satellite sensor, it is difficult to correctly select an appropriate model to express its image point offset because people cannot grasp the distortion in the camera in advance; in addition, it is also difficult to correctly select the model for the nonlinear model that may exist inside the camera order, so it is easy to cause excessive parameters due to the selection of too high order, causing the instability of the solution

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