Schönleber M, Cedilnik G, Tiziani H J
Appl Opt. 1995 Nov 10;34(32):7532-7. doi: 10.1364/AO.34.007532.
The optically generated joint Fourier transform (JFT) of a test image and a reference image is processed using a new method: the JFT is recorded twice. In the second recording the reference image is phase shifted by π with respect to the first recording. The two JFT's are subtracted and binarized with a threshold of zero. Strong correlation peaks are obtained, and correlations within the test image are suppressed. Some results of optical implementation are presented, using a ferroelectric liquid crystal display with 128 × 128 pixels for data input. The phase shift of the reference was implemented by the contrast-inverted reference input on the binary light-modulating device. Processing of the JFT is done by a CCD camera, a frame grabber, and a personal computer.
使用一种新方法处理测试图像和参考图像的光学生成联合傅里叶变换（JFT）：对JFT进行两次记录。在第二次记录中，参考图像相对于第一次记录相移了π。将这两个JFT相减并用零阈值进行二值化处理。得到了强相关峰，并且测试图像内的相关性被抑制。给出了一些光学实现的结果，使用具有128×128像素的数据输入的铁电液晶显示器。参考图像的相移通过在二元光调制器件上输入对比度反转的参考图像来实现。JFT的处理由电荷耦合器件（CCD）相机、图像采集卡和个人计算机完成。
