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Ｘ 射线编码三维成像系统中，减少观察层上的重叠噪声是提高图像信噪比的有效方法。该文描述了一种新的解码方法，该方法通过对编码图像在频域进行梳状滤波并在空间重建，可以获得较低重叠噪声的观察层图像。理论分析表明： 所获得的观察层图像的重叠噪声残余能量小于１／ｍ （ｍ为编码图像的数量）。实验中对采用相关解码法和频域梳状滤波法所获得的层析图像进行了比较。结果表明： 采用频域梳状滤波法所获得图像的信噪比要高于采用相关解码法所获得图像的信噪比，与理论分析相符。
In X-ray-encoded three-dimensional imaging systems, reducing overlapping noise on the observation layer is an effective method to improve the signal-to-noise ratio of the image. A new decoding method is described in this paper. By comb filtering the coded image in the frequency domain and reconstructing it in space, a low overlap noise observation layer image can be obtained. Theoretical analysis shows that the residual energy of the overlapping noise of the obtained observation layer image is less than 1/m (m is the number of encoded images). In the experiment, the tomographic images obtained by the correlation decoding method and the frequency domain comb filtering method were compared. The results show that the signal-to-noise ratio of the image obtained by the comb filtering method in the frequency domain is higher than the signal to noise ratio of the image obtained by the correlation decoding method, which is consistent with the theoretical analysis.