#include "ltwrappr.h"

virtual L_INT LBitmap::EdgeDetectEffect(uLevel, uThreshold, uFlags)

L_UINT uLevel;

edge weight

L_UINT uThreshold;

threshold value

L_UINT uFlags;

edges type

Performs edge detection on the image.

Parameter Description
uLevel Level value used to determine the brightness of the edges. Standard value is 50. Range between 1 and 100. Big values will produce bright edges.
uThreshold Threshold value used to determine which pixels are going to be filtered. If the difference determined for a pixel is less than this value, the pixel is set to 0. If the difference is greater, the filter will be applied to the pixel. The valid range is from 0 - 65535 for 64-bit, 48-bit and 16-bit grayscale images and from 0 - 4095 for 12-bit grayscale images. Otherwise, it is from 0 to 255.
uFlags Flag that indicates the type of edge to generate. Possible values are:
  Value Meaning
  EDGE_SOFT [0] Generate softer (smoother) edges.
  EDGE_SOLID [1] Generate rougher edges.



The function was successful.

< 1

An error occurred. Refer to Return Codes.


This function detects the edges in a bitmap and then replaces the values of edges by new values calculated according to the uFlags.

This function supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available only in the Document/Medical toolkits.

To update a status bar or detect a user interrupt during execution of this function, refer to LBase::EnableStatusCallback.

This function does not support signed data images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image is passed to this function.

This function does not support 32-bit grayscale images. It returns the error code ERROR_GRAY32_UNSUPPORTED if a 32-bit grayscale image is passed to this function.

Required DLLs and Libraries


For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.


Win32, x64.

Help Version 19.0.2017.10.27
Products | Support | Contact Us | Copyright Notices
© 1991-2017 LEAD Technologies, Inc. All Rights Reserved.
LEADTOOLS Raster Imaging C++ Class Library Help