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基于微扫描的超分辨成像技术在成像系统光学参数不变的基础上提高图像分辨率,常用于红外成像领域。目前,在基于微扫描的红外超分辨成像研究中,采用理想的正方形模型来仿真红外探测器的感光面形状。但是,由于读出电路的存在,实际探测器产品中像素感光面形状并非严格的正方形,使用正方形模型仿真会导致仿真结果和研究结论的不准确。推导了长方形和“折形”两种感光面模型对成像的影响,并通过与正方形模型的仿真对比确定相应的误差,最后结合实验对前述研究成果进行了验证。结果表明:极限情况下,相对于“折形”模型,使用方形模型仿真的误差高达41%;相同像素填充率时,“折形”感光面越远离中心,对成像的MTF影响越大;基于探测器真实感光面形状的仿真模型能有效提高对红外超分辨成像研究的准确性。
The super-resolution imaging technology based on micro-scanning improves the resolution of the image based on the constant optical parameters of the imaging system and is often used in the field of infrared imaging. At present, in the research of infrared super-resolution imaging based on micro-scanning, an ideal square model is used to simulate the shape of the light-sensing surface of the infrared detector. However, due to the existence of the readout circuit, the shape of the pixel sensing surface in the actual detector product is not strictly square. Using the square model simulation can lead to inaccuracies in the simulation results and the research conclusions. The effects of the rectangular and “zigzag ” models on the imaging are deduced. The corresponding errors are determined by the simulation with the square model. Finally, the above research results are verified with the experiments. The results show that the error of square model simulation is as high as 41% in the limit case compared with that of the “zigzag” model. The farther away from the center of the “zigzag” photosensitive surface at the same pixel filling rate, the MTF effect on the imaging The simulation model based on the real photoreceptor shape of the detector can effectively improve the accuracy of infrared super-resolution imaging.