Modern Algorithms for Image Processing: Computer Imagery by Example Using C#

© Vladimir Kovalevsky 2019

Vladimir KovalevskyModern Algorithms for Image Processinghttps://doi.org/10.1007/978-1-4842-4237-7_6

6. Edge Detection

Vladimir Kovalevsky¹ 

(1)

Berlin, Germany

 

Among the known methods of edge detection are simple gradient filters containing some kind of smoothing of the image. The Sobel filter is a common example. It is defined by two matrices with weights as shown in Figure 6-1.

Figure 6-1

Weights of Sobel filter

The filter calculates two sums SH and SV of products of the gray values in a gliding 3 × 3 neighborhood of the actual pixel with corresponding weights WH and WV shown in Figure 6-1 and returns the sum of the absolute ...