Chapter 1
The math of the outline
Chapter 2
Teaching neural networks to see like artists
Chapter 3
Real world superpowers of edge detection
YOUR GOAL
Master of How computers draw the lines of our world
Ch 1 · The math of the outline
007skaty The Canny edge detector suppresses noise using a Gaussian filter and applies two mathematical thresholds to decide which
007skaty Glowing neon lines trace the sharp cliffs where colors change on a dark screen
Fun Fact
Pixel speed: A computer can find edges in a photo in less than a millisecond, but it has no idea what the picture actually shows.
Glossary
gradient (noun)
An inclined part of a road or railway, or the rate of such a slope. In 1968, Irwin Sobel introduced an operator at Stanford that calculates pixel gradients to locate object boundaries.
An inclined part of a road or railway, or the rate of such a slope. In 1968, Irwin Sobel introduced an operator at Stanford that calculates pixel gradients to locate object boundaries.
Quiz
What size is the classic grid, or kernel, used by the Sobel operator to scan pixels?
Quiz
Who invented the widely used 1968 mathematical operator that highlights image gradients?
Quiz
Which major limitation did traditional edge detection face when analyzing real-world scenes?