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针对不能确定斜模式采样的倾斜角度,与后期纠正处理带来的锯齿、混叠等效应,以及斜模式采样在采样过程中产生的混叠等问题,设计并实现了27°斜模式采样方式以降低采样后处理产生的锯齿等降质效应,通过分析线阵CCD采样过程中混叠的成因,将倒易晶胞应用于复原实际斜采样的遥感图像中。截止频率评价图像的分辨率证明:本文方法复原的图像较常规采样图像的分辨率提高了2.26倍。27°斜模式采样与倒易晶胞的复原方法可以应用到无高分辨率参考图像的遥感图像复原中,并可以减少混叠,使复原图像有更好的效果。
Aiming at the problems of incapability of determining the tilt angle of skew mode sampling, aliasing and other aliasing effects caused by post-correction processing, and aliasing caused by skew mode sampling in the sampling process, a 27 ° skew mode sampling mode is designed Reduce the aliasing effect such as aliasing caused by the sampling and post-processing, and analyze the causes of aliasing in the sampling process of the linear CCD, and apply the inverted unit cell to recover the actual oblique sampling remote sensing image. Cut-off frequency evaluation of the image resolution shows that: the method of image restoration compared with the conventional sampling image resolution 2.26 times. The method of 27 ° oblique mode sampling and reciprocal unit cell recovery can be applied to remote sensing image restoration without high resolution reference image and the aliasing can be reduced so that the restored image has a better effect.