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讨论了基于绝对差度量的灰阶图像识别问题；利用光学相关原理和循环编码方法实现了基于绝对差度量的灰阶图像快速匹配处理；基于差异度矩阵和λ截集的概念来描述匹配结果，提高了灰阶目标识别抵抗各种畸变干扰的稳定性。此方法可以适用于任何的相干光和非相干光相关系统，给出了实验示例。
The problem of grayscale image recognition based on absolute difference measure is discussed. The gray relational image fast matching algorithm based on absolute difference measure is realized by using optical correlation principle and cyclic coding method. The matching result is described based on the concept of difference degree matrix and λ- Improve the stability of gray-scale target recognition to resist various distortions. This method can be applied to any coherent light and incoherent light-related systems, given experimental examples.