Zhu Z, Liu L
Appl Opt. 1994 Aug 10;33(23):5328-34. doi: 10.1364/AO.33.005328.
Because of the advances made in optical technology, an extension can be made from the well-known stack filter to a new kind of gray-scale filter by using arbitrary Boolean functions instead of positive Boolean functions in the second step of a three-step process. Applications of these threshold-decomposed Boolean-based gray-scale filters in image processing include image smoothing and feature detection. A general optical implementation approach of nonlinear threshold-decomposed Boolean-based gray-scale filters is also described that utilizes area coding, gray scale correlation and lookup table thresholding techniques. Some experimental results are demonstrated.
由于光学技术取得的进展，通过在三步过程的第二步中使用任意布尔函数而非正布尔函数，可以从著名的堆栈滤波器扩展到一种新型的灰度滤波器。这些基于阈值分解布尔函数的灰度滤波器在图像处理中的应用包括图像平滑和特征检测。还描述了一种基于非线性阈值分解布尔函数的灰度滤波器的通用光学实现方法，该方法利用了面积编码、灰度相关和查找表阈值技术。展示了一些实验结果。
