光纤耦合的亚像元超分辨率扫描成像图像处理

Sub-pixel processing for a super-resolution scanning imaging system with fiber bundle coupling

遥感成像时,采用六角形排列叠层结构的光纤束耦合图像,微扫描工作方式使目标图像依次通过各层光纤。六角形排列的光纤束邻近层光纤之间的错位属亚像元量级,采用亚像元图像处理能获取超分辨率图像。亚像元处理时,首先分离邻近层光纤耦合的图像,以其中一幅图像为基准对另一图像进行配准处理得到中间图像,然后对中间图像和基准图像进行傅里叶变换。考虑仪器及人眼分辨极限,设定图像信号为带限信号,将光纤束邻近层半个像元的错位转化为两幅图像频谱的相位差,从而确定图像融合的插值函数。实验结果表明,针对光纤束六角形排列的亚像元处理获取了超高空间分辨率的图像。

A kind of multilayer fiber bundle was used to couple the image in a remote sensing imaging system.The object image passed through all layers of fiber bundle respectively with micro-scanning mode.The displacement of adjacent layers arranged in a hexagonal pattern was at sub-pixel scale,which could improve the spatial resolution of the image when used to process image.Firstly,the images coupled by the adjacent layer fibers were separated.Secondly,the intermediate image was obtained by histogram registration based on one of the separated image called base image.Finally,the intermediate image and the base image were processed in frequency domain.The displacement of the adjacent layers fiber was converted to the phase difference in Fourier transform.Considering the limited sensitivity of the experimental instruments and human sight,the image was set to be band-limited signal and the interpolation function of image fusion was found.The experimental result shows that a super-resolution image is obtained.