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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。
A new method of binary transform correlation recognition based on phase shift combined with power spectrum subtraction is proposed: a special half-wave plate is fabricated and the zero-order power spectrum is removed from the joint power spectrum by π-phase shift technique and binarized . Compared with the classical joint correlation transform and the binary joint correlation transform, the binary joint correlation transform based on the phase shift power spectrum subtraction makes the space bandwidth of the input plane more fully utilized and obtains higher and sharper correlations Peak, a greater correlation of signal to noise ratio, improve the relevant identification ability. The corresponding computer simulation and optical experiment results are given.