We propose and demonstrate parallel subtraction of the Fourier power spectrum of two images with the use of real-time holographic interferometry. The subtraction, which exhibits shift invariance, is achieved by employing a Mach—Zehnder interferometer and a photorefractive crystal. The results are presented and discussed.
© 1992 Optical Society of America
Pochi Yeh, Dapeng Zhang, and Claire Gu, "Parallel subtraction of Fourier power spectrum using holographic interferometry," Opt. Lett. 17, 70-72 (1992)