赋形像元探测器在超分辨重建中的应用

大多数光电成像系统的空间分辨率都与探测器的元数密切相关,增加探测器的元数是提高成像系统空间分辨率的核心问题之一.在不增加探测器元数的前提下,提高空间分辨率的技术途径之一就是超分辨重建技术,它通过增加探测器采样频率来提高探测器的空间分辨率.考虑到探测器的空间分辨率并不完全取决于采样作用,且受像元孔径效应的影响,提出了一种赋形像元探测器.基于巴比涅原理中的互补屏原则,将原有的红外探测器中的每个正矩形像元去掉1/4,用剩余部分来等效获取去掉部分的高截止频率;同时利用两列赋形像元探测器进行亚像元推扫,结合像元细分算法,实现超分辨重建.通过同时提高系统采样频率和探测器的截止频率来实现红外系统最终的高分辨率重建成像.

Application of special-shaped-pixel detectors in super resolution reconstruction

For most electro-optical imaging systems, spatial resolution is mainly related to the detector number of imaging systems. Increasing the detector number is one of the key technologies to improve the spatial resolution.However,the technology called super resolution reconstruction could improve resolution without increasing the detector number, which was realized by increasing sampling frequency. Considering that the spatial resolution of the detector didn't depend entirely on the sampling effect, but also on the pixel aperture effect,a special-shaped-pixel detector was proposed.Based on the complementary screens in Barbinet' s principle, the original IR detectors were deducted a quarter at specific place of each rectangle pixel and the remnant was used to equal the quarter on cut-off frequency. Then two special-shaped-pixel arrays were placed parallelly to push-scan with sub-pixel pace for pixel subdivision.So a grayscale matrix inversion was computed in the post-detection processing and used to realize super resolution reconstruction. Finally it is proved that the super resolution reconstruction with special-shaped-pixel detectors should enhance spatial resolution further.