Pixel's edge strength

How to find out the pixel's edge strength so that we can compare it with a threshold value.

Answer 1

[Image Analyst]

Use imgradient().

[Balkar Singh]

Thank you

Answer 2

[Manish M]

Hi

There is no such thing as a pixel's edge strength. You would just compare the pixel value with the threshold. If you are trying to implement Canny edge detector, you just compare the pixel value with the neighbouring pixels along the normal to the edge.

[Image Analyst]

Not sure why you say that. There certainly are metrics that are related to the edge strength of the image on a pixel-by-pixel basis, for example imgradient():

[Gmag,Gdir] = imgradient(I) returns the gradient magnitude, Gmag, and the gradient direction, Gdir, for the grayscale or binary image I.

and

mask = GMag < someThreshold;

will certainly not give you the same image as where you "just compare the pixel value with the threshold":

mask = I < someThreshold;

[Balkar Singh]

Thank you