Douklias N, Shamir J
Appl Opt. 1973 Feb 1;12(2):364-7. doi: 10.1364/AO.12.000364.
It is well known that the optical Fourier spectrum of an object does not depend on its position in the object space. One generally concludes that the correlation with a Vander-Lugt filter is likewise invariant with respect to object position. The present investigation shows that the correlation signal is not object position independent, at least, when the filter is recorded on a recording material of nonvanishing thickness. For a conventional photographic emulsion, we show that the correlation signal depends very strongly on object position.
众所周知，物体的光学傅里叶光谱不取决于其在物空间中的位置。人们通常得出结论，与范德 - 卢格特滤波器的相关性同样相对于物体位置是不变的。目前的研究表明，至少当滤波器记录在具有非零厚度的记录材料上时，相关信号并非与物体位置无关。对于传统的照相乳胶，我们表明相关信号非常强烈地依赖于物体位置。
