LBitmap::EdgeDetectStatistical

#include "ltwrappr.h"

virtual L_INT LBitmap::EdgeDetectStatistical (uDim, uThreshold, crEdgeColor, crBkColor)

L_UINT uDim;

/* dimensions of the edge detector neighborhood */

L_UINT uThreshold;

/* threshold value */

COLORREF crEdgeColor;

/* color value */

COLORREF crBkColor;

/* color value */

Detects edges by examining the variation of colors in all directions using statistical indices.

Parameter

Description

uDim

Dimensions of the neighborhood used to detect edges (uDim x uDim), in pixels.

uThreshold

Threshold value used to determine which pixels are edge pixels. If the difference determined by the edge detector algorithm for a pixel is greater than this value, the pixel is an edge 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.

crEdgeColor

The COLORREF value that specifies the edge color. You can specify a COLORREF value, such as the return value of the Windows RGB macro, or you can use the PALETTEINDEX macro to specify a palette color.

crBkColor

The COLORREF value that specifies the non edge color. You can specify a COLORREF value, such as the return value of the Windows RGB macro, or you can use the PALETTEINDEX macro to specify a palette color.

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

The edges are detected by applying a statistical filter that analyzes the variations of colors in all directions around each pixel.

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

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.

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.

Required DLLs and Libraries

LTIMG

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, LBitmapBase::Combine, LBitmap::IntensityDetect, LBitmap::Sharpen, LBitmap::SpatialFilter, LBitmap::EdgeDetector

Topics:

Detecting and Enhancing Edges and Lines

 

Raster Image Functions: Filtering Images

 

Using Color Values in LEADTOOLS

 

Raster Image Functions: Detecting and Enhancing Edges and Lines

Example

void TestFunction(LAnimationWindow *BitmapWindow) 
{
   BitmapWindow->EdgeDetectStatistical (15, 128, RGB(255, 255, 255), RGB(0, 0, 0)); 
}