Hough Transform

A good description is on this page.

Wikipedia also has its own Hough Transform article.

Pros

• Able to detect dashed lines

Cons

• Can only detect straight lines, making it almost useless for curved lines - which will probably be common
  • Useless for detecting curved lines
• Designed to detect lines as opposed to detecting line segments
• Computationally expensive (when compared to simple filters)

Input

• A binary/grayscale image hilighting the line-pixels in the input image

Output

• A list of the positions/orientations of the lines detected in the input image

Pictures

Two solid straight lines

One solid curvy line

Two solid curvy lines

Two dashed curvy lines