TDI-CCD-based large-aperture long-focal length remote sensing camera distortion measurement device and measurement method

Abstract

The invention relates to a large-aperture long-focal length remote sensing camera distortion measurement device and a measurement method. The device comprises a collimator, a two-dimensional turntable, a mechanical shutter, an integrating sphere, a star point target, and a TDI-CCD long-focal length large-aperture remote sensing camera, wherein the TDI-CCD long-focal length large-aperture remote sensing camera is arranged on the two-dimensional turntable; the collimator is arranged at the entrance pupil place of the TDI-CCD long-focal length large-aperture remote sensing camera; and the light input end of the collimator is sequentially provided with the mechanical shutter, the star point target and the integrating sphere. The TDI-CCD long-focal length large-aperture remote sensing camera works in a planer array imaging mode, the mechanical shutter and the camera are exposed synchronously, the star point target serves as a camera imaging target via the collimator, and for completing each time of star point imaging, the turntable is rotated for an angle in a vertical integrating direction along the TDI sensor. Thus, the whole sensor is traversed, images of multiple of star point images at different positions are acquired, and through carrying out matching calculation between precise positions of the star point images and rotation angles of the turntable, distortion coefficients of the TDI-CCD linear array remote sensing camera in vertical and parallel push-broom directions can be acquired at the same time.

Description

Technical field [0001] The invention relates to the field of optics and machinery, in particular to a TDI-CCD-based large-aperture long-focus remote sensing camera distortion measurement device and method. Background technique [0002] In the imaging process of the camera, the light scattered by the target is collected on the sensor of the camera through the optical system of the camera, and the sensor performs photoelectric conversion and quantization processing, and finally obtains an image similar to the target. In an ideal situation, the image and the target are geometrically similar. In actual imaging, due to the structural characteristics of the optical lens, there is always a certain geometric distortion between the image and the object, which is the distortion of the imaging system. In applications that require high geometric parameters, it is necessary to correct the geometric distortion of the image to eliminate or reduce the impact of camera distortion on imaging. In...

AI Technical Summary

Problems solved by technology

Due to the limited number of reference target settings, the accuracy of the obtained distortion coefficient will not be too high, which will cause a large residual error in the distortion correction of the final image

Images