Finding the Edges (Sobel Operator) – Computerphile

Our eyes can spot edges with no problems, but how do computers determine what’s an edge and what’s not? Image Analyst Dr Mike Pound explains the Sobel Edge detector.

How Blurs & Filters work:
The Problem with JPEG:
Secrets Hidden in Images (Steganography):
Man in the Middle Attacks:

Mike’s Code in a zip file:

This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham:

Computerphile is a sister project to Brady Haran’s Numberphile. More at

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