L_EdgeDetectStatisticalBitmap

#include "l_bitmap.h"

L_INT EXT_FUNCTION L_EdgeDetectStatisticalBitmap(pBitmap, uDim, uThreshold, crEdgeColor, crBkColor)

pBITMAPHANDLE pBitmap;	/* pointer to the bitmap handle */
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
pBitmap	Pointer to the bitmap handle that references the bitmap in which the edge detector is applied.
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 L_SetStatusCallback.

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.

Platforms

Windows 95 / 98 / Me, Windows 2000 / XP.

Functions:	L_CombineBitmap, L_IntensityDetectBitmap, L_SharpenBitmap, L_SpatialFilterBitmap, L_EdgeDetectorBitmap, L_AutoColorLevelBitmap, L_ColorLevelBitmap, L_CorrelationBitmap, L_GrayScaleToDuotone, L_GrayScaleToMultitone, L_HolesRemovalBitmapRgn, L_SelectiveColorBitmap, L_SkeletonBitmap, L_BricksTextureBitmap, L_DeskewBitmap, L_DeskewBitmapExt, L_DiffuseGlowBitmap, L_GlowFilterBitmap, L_HalfTonePatternBitmap, L_HighPassFilterBitmap, L_MaskConvolutionBitmap, L_PerspectiveBitmap, L_PlasmaFilterBitmap, L_PointillistBitmap
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