ImageEn, unit imageenproc |
|
TImageEnProc.EdgeDetect_Sobel
Declaration
procedure EdgeDetect_Sobel();
Description
Detect the edges of objects within an image using a Sobel filter.
The result is a gray scale bitmap: high values (closed to 255) are edges.
When
Location is ieTBitmap, the output pixel format is i24RGB, otherwise it is ie8g.
To make the result black & white (with 1=edge) it is recommended you call
ConvertToBWThreshold using the parameter -2 (Maximum Entropy Algorithm).
Note: Edge detection is performed on entire image. It is not affected by any selection
| Demos\ImageEditing\CompleteEditor\PhotoEn.dpr |
| Demos\ImageEditing\EveryMethod\EveryMethod.dpr |
Method Comparison
ImageEnView1.IO.LoadFromFile( 'D:\TestImage.jpg' );
// Detect the edges of objects within an image using a Sobel filter
ImageEnView1.Proc.EdgeDetect_Sobel();
ImageEnView1.Proc.Negative();
// Convert the current color image to black & white (1 bit) using a Shen-Castan (ISEF) edge detection algorithm
ImageEnView1.Proc.EdgeDetect_ShenCastan();