McAulay A D
Appl Opt. 2000 May 10;39(14):2300-9. doi: 10.1364/ao.39.002300.
An optical correlator, believed to be novel, adds an x-y mirror image to the input and filter images to perform convolution involving amplitude and phase. The resulting real Fourier transform filters can be loaded into a liquid-crystal device (LCD). In contrast, a complex filter would require high-resolution film. A Hilbert transform and a point source are applied at the filter plane to reduce filter storage and LCD loading time by a factor of 2. An optional spatial filter removes an offset intensity and squares the result. Filters have only twice the number of pixels of the images. Analysis is verified by computer simulation, and performance is discussed.
一种据信具有创新性的光学相关器，会将输入图像和滤波器图像的x-y镜像添加进去，以执行涉及幅度和相位的卷积。由此产生的实傅里叶变换滤波器可被加载到液晶器件（LCD）中。相比之下，复滤波器则需要高分辨率胶片。在滤波器平面应用希尔伯特变换和点源，可将滤波器存储和LCD加载时间减少一半。一个可选的空间滤波器可去除偏移强度并对结果进行平方运算。滤波器的像素数量仅为图像的两倍。通过计算机模拟验证了分析结果，并对性能进行了讨论。
