根据击中击不中运算的定义提出基于光学单通道相关器的灰度腐蚀的概念，证明了图像对具有三个灰度级的结构核的腐蚀操作等价于击中击不中形态学操作；给出选择正确的结构核灰度级的条件；设计了只有一个图像和一个灰度结构核的单通道非相干光学相关器来并行一步取阈完成击中与否运算。最后给出该处理器用于人脸识别的实验结果。 Based on the definition of hitting miss operation, the concept of grayscale corrosion based on optical single-channel correlator is proposed. It is proved that the corroding operation of the image to the structural core with three gray levels is equivalent to the hit-miss morphological operation The condition of selecting the correct gray level of the structure nucleus is given. A single-channel incoherent optical correlator with only one image and one gray-scale structure nucleus is designed to complete the hit or miss operation in one step. Finally, the experimental results of the processor for face recognition are given.