to find length of edges

is there any function for finding out the length of the edges and average number of edges...?actually i hav to determine the edges using canny edge detection method.So how can i find out the length and average number of edges?

[Walter Roberson]

The number of edges averaged over what?

Answer 1

[Image Analyst]

The edge image returned by edge() is a logical image. So to get the length of all the edges, you do

lengthOfEdges = sum(edgeImage);

To get the number of edges:

[labeledImage numberOfEdges] = bwlabel(edgeImage);

To get average edge length (which you didn't ask for but I'm giving you anyway in case you need it), it's

averageEdgeLength = lengthOfEdges  / numberOfEdges;

To get the average number of edges you have to define (like Walter asked) what you're averaging over.

[David Young]

I think you mean sum(edgeImage(:)) or sum(sum(edgeImage))

[Image Analyst]

Correct - good catch!

Answer 2

[David Young]

Guessing a little, but I suspect that the following functions will be sufficient:

• sum
• bwlabel
• regionprops

[christian bale]

thks..