L_SkeletonBitmap

#include "l_bitmap.h"

L_INT EXT_FUNCTION L_SkeletonBitmap(pBitmap, uThreshold)

pBITMAPHANDLE pBitmap;	/* pointer to the bitmap handle */
L_UINT uThreshold;	/* threshold value */

Finds the skeleton of objects or regions in a bitmap. This function is available in the Medical Toolkits.

Parameter	Description
pBitmap	Pointer to the bitmap handle that references the bitmap for which to find the skeleton.
uThreshold	Threshold value used to binarize the bitmap before finding the skeleton. This parameter is ignored if the bitmap is a binary bitmap. 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.

Returns

SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

This function finds the skeleton of regions or objects in a binary bitmap. The white color represents the objects and the black color represents the background. If the bitmap is not a 1-bit image, the threshold will be used to transform the bitmap into a binary image before finding the skeleton.

If the bitmap has a region, this function works only on the region.

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 L_SetStatusCallback.

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_GlowFilterBitmap, L_CorrelationBitmap, L_DiffuseGlowBitmap, L_HighPassFilterBitmap, L_MaskConvolutionBitmap
Topics:	Detecting and Enhancing Edges and Lines
	Raster Image Functions: Image Processing: Filtering Images
	Color Halftone and Halftone Images
	Raster Image Functions: Detecting and Enhancing Edges and Lines

Example

/* This example loads a bitmap and finds its edges using L_EdgeDetectorBitmap then produces the skeleton of these edges */
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_EdgeDetectorBitmap (&LeadBitmap,60, EDG_SOBEL_ALL);
L_SkeletonBitmap(&LeadBitmap, 128);