#include "ltwrappr.h"

virtual L_INT LBitmap::Smooth(pSmooth, uFlags = 0)

Smooths the bumps and fills in the nicks of a 1-bit black and white image.


pSMOOTH pSmooth

Pointer to the SMOOTH structure that LEADTOOLS uses to perform the smoothing operation.

L_UINT32 uFlags

Reserved for future use. Must be 0.


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


This function smooths the text in scanned text documents.

The behavior of this function can be modified by overriding LBitmap::SmoothCallback.

This function works only on 1-bit black and white images.

If a region is selected, only the selected region will be changed by this function. If no region is selected, the whole image will be processed.

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.

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


Win32, x64.

See Also




This example smooths all nicks and bumps up to 2 pixels in length
Long bumps/nicks are treated before short bumps/nicks
A LEAD region is updated to show all the changes.

L_INT LBitmap__SmoothExample(LBitmapWindow *) 
   SMOOTH smooth; 
   LBitmap m_Bitmap; 
   BITMAPHANDLE BitmapHandle; 
   L_INT32      nRet; 
   nRet = m_Bitmap.Load(MAKE_IMAGE_PATH(TEXT("clean.tif")), 0,ORDER_BGR); 
   if(nRet == SUCCESS) 
      ZeroMemory(&smooth, sizeof(SMOOTH)); 
      smooth.uStructSize = sizeof (SMOOTH); 
      smooth.iLength = 2; 
      smooth.pBitmapRegion = &BitmapHandle; 
      smooth.uBitmapStructSize = sizeof(BITMAPHANDLE); 
      nRet = m_Bitmap.Smooth(&smooth); 
      if (nRet == SUCCESS) 
         //smooth.pBitmapRegion will have the region  
         //free region bitmap 
   return nRet; 

Help Version 22.0.2021.11.10
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LEADTOOLS Raster Imaging C++ Class Library Help