cant find the white pixels

2 min readFeb 7, 2023

Hi all, i try to detect the edges of my image. I use canny edge detector.

Then i tried [c,r]=find(Image==1) to detect the white pixels. I thought in a b/w image the edges would be the white pixels, but this not works quite good. For example the vector with the coordinates is the follwing:

I made a grid for every pixel in image using the method that Steves proposed

As you can see the first pixel [64,2] is not laying on a white pixel while some other are on whites.

Does anyone have any idea why this is happening? Are the edges on a binary image the white pixel or not? If yes then why i get also black pixels coordinates.

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I suspect you’re getting confused with your coordinates. In particular, the names of the variables in your line:

[c, r] = find(...rest does not matter

are very misleading, as c is going to be the rows and r the columns where white pixels are found. Typically, one writes:

[r, c] = find(...rest does not matter.

Also, note that the upper left corner of the image is..

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