Dilates dark objects in the class objects bitmap by the specified amount.


#include "ltwrappr.h"

virtual L_INT LBitmap::MinFilter(uDim=3, uFlags = 0)



Dimensions of the neighborhood used for filtering (uDim x uDim), in pixels.

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 is a more controlled version of the omni-directional dilation filter that you can set with the LBitmap::BinaryFilter function.

The effect can be controlled by specifying the size of the neighborhood that is used for calculating each pixel value. For example, for 8x8, pass 8 in the uDim parameter. Each pixel is replaced with the minimum value of its neighborhood.

This function can process the whole image or a region of the image.

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.

Minimum Function - Before

Minimum Function - Before

Minimum Function - After

Minimum Function - After

View additional platform support for this Minimum function.

Required DLLs and Libraries


Win32, x64.

See Also




L_INT LBitmap__MinFilterExample(LBitmap & Bitmap, L_TCHAR * szFileName) 
   L_INT nRet; 
   nRet =Bitmap.Load(szFileName); 
   if(nRet !=SUCCESS) 
      return nRet; 
   nRet =Bitmap.MinFilter(); 
   if(nRet !=SUCCESS) 
      return nRet; 
   return SUCCESS; 
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