根据数学形态学的基本思想，采用离焦的卷积光学系统，利用电子俘获材料的饱和特性和图像减法功能实现图像微分。这一种方案具有清晰度高、实时性、全并行性的优点，取阈和减法运算都用一片电子俘获薄膜来实现 According to the basic idea of ​​mathematical morphology, a defocused convolution optical system is used to realize image differentiation by using the characteristics of electron capture material saturation and image subtraction. This kind of scheme has the advantages of high definition, real-time, and full parallelism. Both the threshold and the subtraction are realized by using an electron capture film