With phase-shifting joint transform correlation (PSJTC) one uses multiple phase shifts to recover the phase difference between Fourier transforms of the input and the reference. In PSJTC systems the resulting phase-only function is used instead of the joint transform power spectrum (JTPS). Provided it can be recorded linearly, the JTPS reduces to a modulated sinusoidal fringe, especially when the target image matches the reference image. In practice, the JTPS has a wide dynamic range, and a CCD camera has a nonlinear response. Correspondingly, the recorded JTPS turns out to be different from a perfect sinusoidal fringe. Here we study the dynamic range effects of realizing PSJTC with the phase-iterative algorithm.
© 1999 Optical Society of America
Original Manuscript: March 3, 1999
Revised Manuscript: May 25, 1999
Published: September 10, 1999
Hong-Jun Su and Mohammad A. Karim, "Phase-shifting joint transform correlation with phase-iterative algorithm: effect of the dynamic range limit," Appl. Opt. 38, 5556-5559 (1999)