Wuhan University

Mi Wang

Bo Yang

Yingdong Pi

Guo Ye

Jun Pan

Ying Zhu

A robust on-orbit geometric calibration (GC) method based on the rational polynomial coefficient (RPC) model for spaceborne segmented linear-array camera is proposed. Through a series of processing steps, including obtaining reliable ground control point (GCP) observations based a priori gross error elimination, constructing the adjustment model for GC parameters, GC for absolute geometric distortion, GC for relative geometric distortions among segmented charge-coupled devices (CCDs), and the correction for the created bias field-of-view (FOV) distortion, this invention is able to achieve robust GC for camera distortion, as well as accurate geometric splicing and registration of segmented CCDs under the same geometric benchmark.

RPC-based on-orbit geometric calibration method for spaceborne segmented linear-array camera

A method of jitter detection and image restoration for high-resolution TDI CCD satellite images. The method includes: obtaining a parallax image after a sub-pixel matching method relying on a correlation coefficient and least squares algorithm; transferring a jitter offset from an image space to an object space by an integral transformation function (ITF); dealing with a continuous push-broom mode of cameras in a discrete way with a denser sampling strategy according to a continue dynamic shooting model (CDSM), obtaining a specialized CDSM and feeding it back to the ITF; applying the accurate ITF to the obtained parallax image and conducting the jitter curve fitting to achieve the jitter detection; estimating a correspondent partial PSF according to the CDSM and the obtained jitter curve; carrying out an adaptive restoration based on context through optimal window Wiener filtering, by means of multiple input and single output to completes the image restoration.

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Wuhan, China

Mi Wang