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LBitmap::EdgeDetectStatistical

#include "ltwrappr.h"

virtual L_INT LBitmap::EdgeDetectStatistical (uDim, uThreshold, crEdgeColor, crBkColor, uFlags = 0)

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

Parameters

L_UINT uDim

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

L_UINT 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 values ranges are:

0 to 65535 for 64-bit, 48-bit and 16-bit grayscale images.
0 to 4095 for 12-bit grayscale images.
0 to 255 otherwise.

COLORREF 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.

COLORREF 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.

L_UINT32 uFlags

Reserved for future use. Must be 0.

Returns

Value	Meaning
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 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.

Platforms

Win32, x64.

Example

L_INT LBitmap__EdgeDetectStatisticalExample(LAnimationWindow *BitmapWindow)  
{ 
 
   return BitmapWindow->EdgeDetectStatistical (15, 128, RGB(255, 255, 255), RGB(0, 0, 0));  
 
}

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