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四、非相干光学图像重建技术在相干光学处理技术中,应用光的相干性的同时将引起难以消除的相干噪声,如闪斑现象,造成图像质量下降。非相干光学处理法就没有这种缺点,因此,采用这种方法重建断层图更引人注目。但是,在非相干光处理中,只得到无相位信息的光强信号。为了弥补这一缺点,在这种非相干重建中,空间域和时间域分别进行处理是必要的。 1.双底片复合滤波正弦图重建法 Eaholm用摄影方法获得卷积正弦图,然后用它进行反投影迭加而形成吸收断层图
Fourth, incoherent optical image reconstruction technology In coherent optical processing technology, the application of light coherence will cause coherent noise is difficult to eliminate, such as the phenomenon of flash spots, resulting in decreased image quality. This is not the case with incoherent optical processing methods, so it is even more compelling to reconstruct the tomograms using this method. However, in incoherent light processing, only the light intensity signal without phase information is obtained. In order to remedy this shortcoming, in this incoherent reconstruction, it is necessary to deal with the spatial domain and the time domain separately. 1. Double Negative Complex Filtering Sinus Reconstruction Method Eaholm obtained a convolution sinogram by photographic method and then used it for back projection superimposition to form an absorption tomogram