Optimal angle in tilting mode super resolution imaging
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摘要: 斜模成像是一种从采样模式上提高影像空间分辨率的方法，斜模成像角度的大小与成像质量密切相关。着重分析了斜模超分成像角度与斜模影像的有效分辨率、混叠、模糊以及噪声的关系，并确定斜模超分辨率最佳成像角度。首先，模拟分析了成像角度为1~90的混叠指数、视场幅宽以及有效分辨率，并提出了用交叉复原方法对影像的分辨率、混叠、模糊以及噪声进行定量评估；然后，利用调制传递函数（MTF）结合倒易晶胞的方法对斜模影像复原，最终确定了最佳成像角度为72；最后，用实际实验验证分析结果表明，当斜模成像角度为72时影像的分辨率提升约1.41倍。Abstract: Tilting mode imaging is a method to improve the spatial resolution of images from the sampling mode, and the imaging angle of tilting mode is closely related to the image quality. This paper was focused on the analysis of the relationship between the angle of the tilting mode and the effective resolution, aliasing, blur, and noise of the tilting mode image, and determined the best imaging angle of the tilting mode superresolution imaging. Firstly, the aliasing index, field width and effective resolution of imaging angle 1-90 were simulated and analyzed, and the resolution, aliasing, blur, and noise of the image were evaluated quantitatively by the cross-restoration method. Then, the modulation transfer function (MTF) was used to restore the tilting mode image by combining the method of the reciprocal cell, and the optimum imaging angle was finally determined to be 72. Finally, the results of the analysis were verified by practical experiments, which show that the resolution of the image is increased by about 1.41 times when the angle of tilting mode imaging is 72.
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