L_DirectionEdgeStatisticalBitmap

#include "l_bitmap.h"

L_INT EXT_FUNCTION L_DirectionEdgeStatisticalBitmap(pBitmap, uDim, uThreshold, nAngle, crEdgeColor, crBkColor)

pBITMAPHANDLE pBitmap;	/* pointer to the bitmap handle */
L_UINT uDim;	/* edge detector size */
L_UINT uThreshold;	/* threshold value */
L_INT nAngle;	/* edge search direction */
COLORREF crEdgeColor;	/* edge color value */
COLORREF crBkColor;	/* non-edge color value */

Detects the variation of colors in the specified direction using statistical indices. It is similar to L_EdgeDetectStatisticalBitmap, but this function allows you to specify the direction angle.

Parameter	Description
pBitmap	Pointer to the bitmap handle that references the bitmap to which the edge detector is applied.
uDim	The dimension or the number of pixels used to calculate the edge in the specified direction.
uThreshold	Threshold value used to determine which pixels are edge pixels. If the difference in the intensity value between the pixel being tested and the average intensity of the pixels in the uDim around it is greater than this value, the pixel is an edge pixel. The threshold range for the 16, 48, and 64-bit bitmaps is from 0 to 65535 and for 12-bit bitmaps from 0 to 4095. Otherwise, it is from 0 to 255. The threshold is applied on channels separately.
nAngle	Angular amount that specifies edge detector direction, in hundredths of degrees. Valid values range from –18000 through 18000. Positive valued angles are produced by counterclockwise rotation above the horizon and negative valued angles are produced by clockwise rotation below the horizon. This value is divided internally by 100.
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 a specified direction 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.

See Also

Functions:	L_CombineBitmap, L_IntensityDetectBitmap, L_SharpenBitmap, L_SpatialFilterBitmap, L_EdgeDetectorBitmap, L_AddBitmapNoise, L_IntensityDetectBitmap, L_SpatialFilterBitmap, L_BinaryFilterBitmap, L_MaxFilterBitmap, L_MinFilterBitmap, L_AddShadowBitmap, L_ChangeHueSatIntBitmap, L_ColorThresholdBitmap, L_DFTBitmap, L_AllocFTArray, L_DirectionEdgeStatisticalBitmap, L_FFTBitmap, L_FreeFTArray, L_FrqFilterBitmap, L_FrqFilterMaskBitmap, L_FTDisplayBitmap, L_GetBitmapStatisticsInfo, L_GetFeretsDiameter, L_GetObjectInfo, L_GetRgnContourPoints, L_GetRgnPerimeterLength, L_MathFunctionBitmap, L_RevEffectBitmap, L_SegmentBitmap, L_SubtractBackgroundBitmap, L_UserFilterBitmap, L_BricksTextureBitmap, L_DeskewBitmap, L_DeskewBitmapExt, L_DiffuseGlowBitmap, L_GlowFilterBitmap, L_HalfTonePatternBitmap, L_PerspectiveBitmap, L_PlasmaFilterBitmap, L_PointillistBitmap, L_DiffuseGlowBitmap, L_HighPassFilterBitmap, L_MaskConvolutionBitmap
Topics:	Raster Image Functions: Image Processing: Filtering Images
	Detecting and Enhancing Edges and Lines
	Using Color Values in LEADTOOLS
	Raster Image Functions: Detecting and Enhancing Edges and Lines

Example

/* This example loads a bitmap and find its edges using a 45 degree angle, a 128 threshold, and a size equal to 15 */
BITMAPHANDLE LeadBitmap; /* Bitmap handle to hold the loaded image. */

/* Load the bitmap, keeping the bits per pixel of the file */
L_LoadBitmap(TEXT("IMAGE1.CMP"), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);

/* Find the edges in the bitmap*/
L_DirectionEdgeStatisticalBitmap (&LeadBitmap, 15, 128, 4500, RGB(255, 255, 255), RGB(0, 0, 0));