Canny Edge Detector
Command
Image
Filters
Canny Edge Detector
Description
Applies a Canny Edge Detector to an image.
The Canny edge detector can detect a wide range of edges in an image.
Dialog box
Sigma: Standard deviation of the Gaussian filter. Good values to start with are between 0.6 and 2.4. Smaller filters cause less blurring, and allow detection of small, sharp lines. A larger filter increases processing time and causes more blurring.
Low and High thresholds: A threshold set too high can miss important information. On the other hand, a threshold set too low will falsely identify irrelevant information (such as noise) as important. 0.2-0.5 are good starting values for the low threshold; 0.6-0.9 are good starting values for the high threshold.
Click Preview to judge the results.
Click OK to proceed.
Examples
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MedCalc
MedCalc Software Ltd