Abstract
The subpixel dynamic imaging technique of a beam splitter is one of the most effective super-resolution imaging methods. Aiming to create a linear time delay integration charge coupled device (TDI–CCD) subpixel imaging system based on the optical assembly method, its modulation transfer function (MTF) is analyzed based on the spatial over-sampling theory. Firstly, Fourier transformation of the sampling point is used to describe the frequency domain characteristics of TDI–CCD, which transform a unit cell of the spatial sampling lattice into a bandwidth cell in the spatial–frequency domain. Considering the effects of velocity mismatch and misalignment, the best subpixel staggering position of the linear TDI–CCD pair is given. Moreover, according to the analysis of the MTF of super-resolution reconstruction results from multiple subpixel images with random spatial offsets, the condition of sampling in the limitation of the enhancement of MTF is obtained. The numerical simulation and real experimental analysis reveal results that are consistent with the theoretical model.
Highlights
IntroductionObtaining high resolution is an important goal of optical satellite remote-sensing technology
Obtaining high resolution is an important goal of optical satellite remote-sensing technology.At present, the second-generation transmission type of remote sensing satellite is equipped with discrete imaging sensors, such as time delay integration charge coupled device (TDI–CCD)
The second-generation transmission type of remote sensing satellite is equipped with discrete imaging sensors, such as time delay integration charge coupled device (TDI–CCD)
Summary
Obtaining high resolution is an important goal of optical satellite remote-sensing technology. The second-generation transmission type of remote sensing satellite is equipped with discrete imaging sensors, such as time delay integration charge coupled device (TDI–CCD). The resolution of the image can be improved by improving the area and spatial density of the optical sensor or using various complex optical systems such as free surface design [2,3], the expense is excessive. The technique of subpixel dynamic super-resolution imaging can overcome the under-sampling effect partially without changing new charge coupled device (CCDs) [4,5]. It use a set of undersampled (aliased) low-resolution (LR) images with subpixel shift to reconstruct a high-resolution (HR)
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