Accession Number : ADA258329


Title :   Nonlinear Joint Transform Correlator


Descriptive Note : Final technical rept. Jun 1989-Apr 1992


Corporate Author : CONNECTICUT UNIV STORRS DEPT OF ELECTRICAL ENGINEERING


Personal Author(s) : Javidi, Bahram


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a258329.pdf


Report Date : Jun 1992


Pagination or Media Count : 43


Abstract : Experiments are provided to investigate the nonlinear joint transform correlator (JTC). Experiments are used to determine the correlation peak intensity, signal to noise ratio (SNR), peak to sidelobe ratio (PSR), and correlation width for various degrees of the nonlinearity used at the Fourier plane. The system is implemented using an optically addressed spatial light modulator in the Fourier plane. The experiments show that for the images used here, nonlinear compression of the joint power spectrum is necessary to pull the signal out of scene noise and produce a peak to sidelobe ratio of larger than unity. In addition the sensitivity of the nonlinear JTC to the scaling and rotational changes of the input objects for various degrees of the nonlinearity applied to the joint power spectrum is investigated. The effect of the modulation transfer function of the spatial light modulator on the nonlinear JTC performance in the presence of multiple input targets is discussed.


Descriptors :   *SIGNAL PROCESSING , *SIGNAL TO NOISE RATIO , *NONLINEAR SYSTEMS , *LIGHT MODULATORS , *OPTICAL CORRELATORS , *JOINTS , COMPRESSION , INPUT , FUNCTIONS , LIGHT , SIGNALS , ADDITION , CORRELATORS , SIDELOBES , MODULATORS , MODULATION , TRANSFER , NOISE , POWER , IMAGES , CORRELATION , SENSITIVITY , TARGETS , INTENSITY , RATIOS , TRANSFER FUNCTIONS , PROCESSING


Subject Categories : Cybernetics
      Optics
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE