基于相移功率谱相减的二元联合变换相关识别

提出基于相移联合功率谱相减的二元联合变换相关识别的新方法：制作特殊的半波片，采用π相移技术，将零级功率谱从联合功率谱中去掉，并进行二值化。与经典联合相关变换和二元联合相关变换相比，基于相移功率谱相减的二元联合相关变换，使输入面的空间带宽得到更充分的利用，还得到了更高、更尖锐的相关峰，更大的相关信噪比，提高了相关识别能力。给出了相应的计算机模拟和光学实验结果。

Binary Joint Transform Correlator Subtracting a Power Spectrum Based on a Phase Shift Technique

In this paper, a binary joint transform correlator subtracting a power spectrum baesd on a phase shift technique (DBJTC) is presented. A special half wave plate is fabricated. The zero order spectra (i.e., the autocorrelation power spectra) are removed form the joint transform power spectrum using the phase shift technique, so that higher diffraction output and more limited size and relative position of the images in the input plan are obtained. Simulation and optical experimental results show that DBJTC has the advantages of higher efficiency, and better peak to sibelabe and signal to noise ratios compared with the classical JTC and binarized JTC.