The joint transform correlator was an effective system for the target detection and recognition, major character was that
the reference template and the target were simultaneous processed; Fourier transform was operated by Fourier transform
lens with the speed of light; the joint transform power spectrum was obtained through the first Fourier transform, then
got the correlation peaks through the second Fourier transform.
The power spectrum of the joint transform correlator was recorded by the Charge Coupled Device (CCD) matrix
camera. The contrast of the power spectrum was relatively lower, so some important information, such as the Young's
interference fringes, were displayed very fuzzy, even couldn't see in some images, the output correlation peaks were
seriously affected. For enhancing the power spectrum's contrast, the power spectrum may be filtered with the high-boost
filtering. By filtering, the contrast of the Young's interference fringes was greatly improved and displayed relatively clear,
so the contrast of the correlation peaks were greatly enhanced, the recognition ratio of the target detection and
recognition by the joint transform correlator was increased. As the experiment examples, the target recognition of a car
and a warship in cluttered scenes were presented. The experiments showed that the contrast of the Young's interference
fringes was improved after the joint transform power spectrum was processed by the high-boost filtering. At the same
time, the output correlation peaks were obviously enhanced too. So the high-boost filtering was very effective method for
filtering in the joint transform power spectrum.