edge pixel frequency of image

How is edge pixel frequency of an image found?

Answer 1

[Image Analyst]

I never heard of it. Seems like maybe you have, and that maybe it's defined in some paper. If I had to guess, I'd call imgradient() and threshold to get a map of where edges are. And then get the area fraction of the edge pixels to see what percentage of the entire image it is.

[Elysi Cochin]

I too used imgradient() to find edges. Then I guessed frequency might be histogram.

[Image Analyst]

That would be the histogram (frequency) of the strength of the edges. If that's what you want, then fine. What do you really want? Let's say you had this thing that you think you need -- okay then what? How will you use it to do the next step in the process? Because if I knew what the next steps were, then I can say whether or not you really need the histogram of the edge strengths or if you need something completely different.

[Elysi Cochin]

In the paper they have not given details or any reference just mentioned, pixel frequency. I am not sure if it is histogram, that's why asked, to confirm

[Image Analyst]

I have no idea. "Pixel frequency" is very vague. Each pixel shows up exactly once in the image so the frequency of every pixel is one over the number of pixels in the image. If you want to group some pixels together, like based on their value or something, then you will get a frequency of occurrence of those values by doing a histogram. I can't really say anymore unless you make it less vague.