LBitmap::EdgeDetectEffect

#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.

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

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

LTIMGEFX

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

See Also

Functions:

LBitmap::BricksTexture, LBitmap::Deskew, LBitmap::DeskewExt, LBitmap::DiffuseGlow, LBitmap::GlowFilter, LBitmap::HalfTonePattern, LBitmap::HighPassFilter, LBitmap::MaskConvolution, LBitmap::Perspective, LBitmap::PlasmaFilter, LBitmap::Pointillist, LBitmap::EdgeDetector, LBitmap::SpatialFilter, LBitmap::EdgeDetectStatistical, LBitmap::DirectionEdgeStatistical, LBitmap::EdgeDetector2, LBitmap::EdgeDetectStatistical2, LBitmap::DirectionEdgeStatistical2, LBitmap::DeskewCheck

Topics:

Raster Image Functions: Filtering Images

 

Detecting and Enhancing Edges and Lines

 

Raster Image Functions: Detecting and Enhancing Edges and Lines

Example

L_INT LBitmap__EdgeDetectEffectExample(LBitmap *pLeadBitmap) 
{
   
   /* Apply find edges effect on the image*/
   return pLeadBitmap->EdgeDetectEffect(50, 0, EDGE_SOFT); 
}