- I have a current threshold range of [0.1 0.15] for the image.
Canny Edge Detection Threshold Values Meaning
213 visualizzazioni (ultimi 30 giorni)
Mostra commenti meno recenti
Chloe O'Mahony
il 22 Giu 2020
Commentato: darova
il 26 Giu 2020
I am using the Canny edge detection method on an image. I am setting the threshold values myself. I have a grayscale image with pixel values in the range 0 to 255. I have a current threshold range of [0.1 0.15] for the image.
My question: what do these two numbers actually mean? (i.e. do they represent a percentage value? so if the pixel value is 15% of 255 it turns it into an edge? This doesnt really make sense as 15% is very low compared to the pixel value that is getting considered an edge in the image)
1 Commento
darova
il 23 Giu 2020
Also threshold value is a single value (not range)
Risposta accettata
Aakash Mehta
il 25 Giu 2020
The 'Canny' method uses two thresholds.
For example, if the threshold is [0.1 0.15] then the edge pixels above the upper limit(0.15) are considered and edge pixels below the threshold(0.1) are discarded.
Now, you may have a question "what about the pixels in between upper and lower threshold"?
They are considered only if they are connected to pixels in the upper threshold. Thus we get a clean edge.
For more details, refer to input arguments section of below link.
Più risposte (0)
Vedere anche
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!