CannyEdgeDetectorCommand Class

Summary

Performs Canny edge detection for the master channel of the image, or for one or more of the three channels (Red, Green, Blue) if the image is colored.

Syntax

Objective-C

C++/CLI

Java

Python

public class CannyEdgeDetectorCommand : RasterCommand

@interface LTCannyEdgeDetectorCommand : LTRasterCommand

public class CannyEdgeDetectorCommand 
    extends RasterCommand

public: 
   ref class CannyEdgeDetectorCommand : RasterCommand

class CannyEdgeDetectorCommand(RasterCommand):

Remarks

This function supports 8-bit, 12-bit, and 16-bit grayscale images; as well as 24-bit, 32-bit, 48-bit, and 64-bit colored images. This function does not support 32-bit grayscale images. It returns the ERROR_GRAY32_UNSUPPORTED error code if a 32-bit grayscale image is passed to this function.

The CannyEdgeDetectorCommand function supports setting rectangular regions.

To update a status bar or detect a user interrupt during execution of this function, refer to Progress Event.

Example

Runs the CannyEdgeDetectorCommand on an image.

using Leadtools; 
using Leadtools.Codecs; 
 
using Leadtools.ImageProcessing.Core; 
 
public void CannyEdgeDetectorCommandExample()  
{      
       
   RasterCodecs codecs = new RasterCodecs(); 
       
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "cannon.jpg"), 0, CodecsLoadByteOrder.Bgr, 1, 1); 
   CannyEdgeDetectorCommand Canny = new CannyEdgeDetectorCommand(); 
   Canny.Radius = 1; 
   Canny.LowThreshold = 2; 
   Canny.HighThreshold = 5; 
   Canny.Run(image); 
   codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "cannon_Canny.bmp"), Leadtools.RasterImageFormat.Bmp, 24, 1, 1, 1, Leadtools.Codecs.CodecsSavePageMode.Overwrite); 
 
   image.Dispose(); 
   codecs.Dispose(); 
       
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}