What Is a Zero Cross Circuit?

Zero-crossing filters are a method to identify edges on multiple scales. The specific operation is to use a Laplacian-ofGaussian (LOG) filter to calculate the second derivative of its change value to identify its important change. One of the main limitations of the previously mentioned local edge extraction filter is that it only uses the information of adjacent pixels around each pixel, and the boundaries on large scales often span many pixels, and are only identified by connecting a single edge pixel Often, it is difficult to extract the boundary. ^[1]