#include "ltwrappr.h"

virtual L_INT LBitmap::Skeleton(uThreshold, uFlags = 0)

L_UINT uThreshold;

threshold value

L_UINT32 uFlags;


Finds the skeleton of objects or regions in a bitmap.




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.


Reserved for future use. Must be 0.



The function was successful.

< 1

An error occurred. Refer to Return Codes.


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.

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


For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.


Win32, x64.

See Also


LBitmap::DiffuseGlow, LBitmap::HighPassFilter, LBitmap::MaskConvolution, LBitmapBase::Combine, LBitmap::IntensityDetect, LBitmap::Sharpen, LBitmap::SpatialFilter, LBitmap::EdgeDetector, LBitmap::GlowFilter, LBitmap::Correlation, LBitmap::Skeleton2


Detecting and Enhancing Edges and Lines


Raster Image Functions: Filtering Images


Color Halftones and Halftone Images


Raster Image Functions: Detecting and Enhancing Edges and Lines


This example loads a bitmap and finds its edges using LBitmap::EdgeDetector then produces the skeleton of these edges

L_INT LBitmap__SkeletonExample(LAnimationWindow * LAniWnd) 
   L_INT nRet; 
   /* Find the edges in the bitmap*/ 
   nRet =LAniWnd->EdgeDetector (60, EDG_SOBEL_ALL); 
   if(nRet !=SUCCESS) 
      return nRet; 
   nRet =LAniWnd->Skeleton(128); 
   if(nRet !=SUCCESS) 
      return nRet; 
   return SUCCESS; 

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