结果表明：直接对无透镜傅里叶数字全息图进行傅里叶逆变换可同时得到与物体完全相同的再现像及其共轭像；
The experimental result shows: In the digital Fourier holography, the reconstructed image and the conjugate image can be obtained by use of Fourier inverse transform directly.
利用傅里叶有限差分算子可保证在复杂构造的波场延拓中，地震波场不失真，成像质量高。此外，本文对傅里叶有限差分算子作了必要的优化。
Fourier finite difference operator can be adopted to ensure good fidelity of seismic wave field in wave field continuation of complicated geology structure, bringing high quality image.
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