在遥感、**侦察和医疗成象等领域,需要得到目标的高分辨率图像.而像面离焦直接影响了成像质量、降低了空间分辨率.为了得到高分辨率图像,往往采用自动焦面补偿装置或温控系统来克服离焦现象,但这又不利于仪器的小型化和轻量化.本文提出,在光学系统光路中加入一特殊设计的非球面掩模板,并对经过位相掩模板后的图像进行图象处理得到清晰图像.使光学系统在大离焦量的情况下仍可获取高分辨率的图像.这对于光学遥感器在复杂的空间环境中获取高分辨率图像具有十分重要的意义.

In domain of reconnaissance, remote sensing etc., people want to get high resolution image. There has a conflict between the resolution and optical system defocus. In order to acquire high resolution image, some ways are taken to minish the defocus, but these ways affect the cost and weight of the system. In this paper, a novel technology was described for extending the depth of focus of incoherent optical systems that does not decrease the resolution of the image. This technology uses generalized aspheric optics to encode images to be invariant to defocus, and digital signal processing to decode the images. It is significant for optical remote sensor to acquire high resolution image under complicated space environment.