| 摘要 |
<p>A system for calibrating the output correlation plane of an optical correlator for positional and nonlinearity information to determine the position of an input image in an input image plane (24) of the optical correlator. The optical correlator operates on the principle of projecting the Fourier transform (32) of an input image onto at least one matched filter (34). The inverse Fourier transform (36) of the correlated optical signal is then projected onto a detector to determine the correlation of the input image with the image of interest. A calibration image is positioned in the input image plane of the optical correlator. At least one matched filter (34) is placed in the optical correlator, and has recorded thereon the Fourier transform hologram (32) of the identical target. The positions of the resultant optical signals in the output correlation plane are then correlated with the position of the two dimensional array of identical targets in the input image plane to calibrate the output correlation plane of the optical correlator for positional information and nonlinearity.</p> |
