Lasis band image registration method and system based on geometric model

Abstract

The invention provides a LASIS waveband image registration method and system based on a geometric model. The method comprises steps of: enabling a LASIS imaging model to be equivalent to a multi-linear-array push-scan model, performing camera calibration, constructing a parallel observation value by using the overlapped area of different waveband images, detecting platform vibration by using the parallel observation amount of two wavebands, and compensating pixel offset caused by the vibration of other wavebands by using detected vibration features; updating the attitude information of the imaging model, aligning the refined new imaging model to the undistorted imaging model, and resampling the original image to achieve waveband image automatic registration. In a conventional method, every two wavebands are matched and cumulative errors exist in a constructed interference sequence so that a poor precision is presented. The method and system prevent the defect, achieve overall high-precision registration of interference sequence image, improve the conventional method in which each waveband is self-compensated, and greatly increase processing efficiency.

Description

technical field [0001] The invention belongs to the field of image processing of photogrammetry and remote sensing, and relates to a LASIS band image registration method and system based on a strict imaging geometric model and a parallel observation method to eliminate flutter. Background technique [0002] The Large Aperture Static Interferometric Imaging Spectrometer (LASIS) is a push-broom-based Fourier transform imaging spectrometer. This type of spectrometer has the characteristics of high stability, compact structure, etc., and has better performance in orbit. The spectral performance of the LASIS interferometer depends on the registration accuracy of images in different bands. However, due to the characteristics of joint space-time modulation, the imaging time of the same ground object in different bands is inconsistent during the imaging process. Once the satellite platform is disturbed, different Band image pixel positions have different effects. The attitude jitte...

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Problems solved by technology

For example, Yann Ferrec systematically analyzed the factors that reduce the quality of LASIS spectral imaging, and pointed out that attitude flutter will directly affect the quality of the interferogram, but did not give a specific solution

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