The LBTEK Fourier Transform Image Recognition System is based on Fourier transform theory, utilizing a Mach-Zehnder interferometer paired with a Fourier lens for image spectrum conversion and correlation output. It enables the recognition of simple targets such as identical and different characters, and obtains their joint power spectra and correlation peak images. This experimental setup can be roughly divided into the following three parts: 1) A highly coherent He-Ne laser combined with an attenuator and beam-expanding collimating lens group to provide laser output; 2) A Mach-Zehnder interferometer composed of various mirrors and beam splitters (combiners), with reference images and images to be identified placed separately in the two optical paths of the interferometer, allowing the two images to be projected onto the Fourier transform lens with equal optical path lengths; 3) The use of lenses and a combination of lenses and spatial light modulators to perform two Fourier transforms, obtaining the joint transform power spectrum of the two images to be identified via CMOS1, and finally obtaining the correlation output via CMOS2.