基于微变焦法的超分辨率成像技术及实验研究

从空间域的角度分析了微变焦法的原理,微变焦过程可等效为改变每个光敏元所对应物辐射率分布区域的位置和大小,由此建立微变焦过程的空域模型为一个线性方程组,由该模型可描述观察图像和目标高分辨率图像之间的关系,并通过求解该方程组得到目标图像。最后做了面阵CCD的超分辨率成像实验,结果表明微变焦法可明显提高成像系统的分辨率。

A Research on Spatial Model of the Superresolution Imaging by Micro-Zooming and Its Experiments

The principle of micro-zooming is analyzed in the spatial domain. Micro-zooming is the method that changes imaging focal length of the optical system gradually to obtain a series of images of the same scene with different amplified multiples, and reconstruct a high resolution image through these images. It can be used to realize superresolution imaging of opto-electronic imaging systems. Micro-zooming imaging can be equivalent to change the area and position of the sensor element's corresponding object radiance distribution region, which are related to the magnification and the location of the sensor elements respectively. So the spatial model can be established and the relationship between the observed images and the ideal high resolution image can be given as linear equations. The high resolution image can be obtained by solving the equations. The experiment of the superresolution imaging of area-array CCD by micro-zooming is described in the end of the paper. It denotes that the resolution of the image increases markedly.