The book "Canny Edge Detector" by Betascript Publishing offers a comprehensive introduction to the Canny edge detection operator, developed by John F. Canny in 1986. It covers the multi-stage algorithms used to detect a variety of edges in images. A central element of the book is the explanation of the computational theory of edge detection, which sheds light on how this technique works. Canny utilized calculus to find a function that optimizes a given functional. This theory is supported by the description of an optimal function represented by the sum of four exponential terms, but it can also be approximated by the first derivative of a Gaussian function. The book is aimed at professionals and students who wish to gain a deeper understanding of image processing and edge detection techniques.