UDC 623.4.023.41
LINEAR OPERATOR TO DETECT OBJECT EDGES WITH A PRIORI SPECIFIED ANGULAR ORIENTATION IN A DIGITAL IMAGE
I. S. Kholopov, Ph.D. (Tech.), associate professor, Department of Radio Engineering Systems, RSREU, Ryazan, Russia;
orcid.org/0000-0001-5220-0811, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
T. S. Kislitsyna, assistant, Department of Radio Engineering Systems, RSREU, Ryazan, Russia;
orcid.org/0000-0003-0374-8316, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
E. S. Shtrunova, Ph.D. (Tech.), associate professor, Department of Radio Engineering Systems, RSREU, Ryazan, Russia;
orcid.org/0000-0003-1878-8011, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
The aim of the work is to develop a linear two-dimensional operator that implements the calculation of a brightness gradient in a digital image in a priori given angular direction. The geometric statement of the problem and the algorithm for calculating the weight coefficients of linear filter mask are given. It is shown that the developed linear operator makes it possible to successfully detect edges with user-defined angular orientation when signal-to-noise ratio is more than 10. An example of using a linear operator in an applied task of measuring the distance to objects on a railway using information from a single camera frame is given.
Key words: brightness gradient, edge detector, Prewitt operator, Nevatia – Babu operator.