In This Topic ▼

L_MeanShiftFilterBitmap

Summary

Performs noise reduction while preserving detail.

Syntax

#include "l_bitmap.h"

L_LTIMGCOR_API L_INT L_MeanShiftFilterBitmap(pBitmap, nRadius, nColorDistance, uFlags)

Parameters

pBITMAPHANDLE pBitmap

Pointer to the bitmap handle that references the bitmap to be updated.

L_INT nRadius

Size of the kernel where the middle pixel would be considered as the source pixel.

L_UINT nColorDistance

Color difference between the investigated pixel and the source pixel.

Returns

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

Comments

To keep details while removing noise, pass low positive values to ColorDistance parameter.

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 in the Document and Medical Imaging 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.

Mean Shift Function - Before

Mean Shift Function - After

View additional platform support for this Mean Shift function.

Required DLLs and Libraries

LTIMGCOR
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

Win32, x64, Linux.

Example

This example loads a bitmap and applies the MeanShift Filter on it

L_INT MeanShiftFilterExample(L_VOID) 
{ 
   L_INT nRet; 
   BITMAPHANDLE LeadBitmap; /*Bitmap handle to hold the loaded image*/ 
 
   /* Load the bitmap, keeping the bits per pixel of the file */ 
   nRet = L_LoadBitmap(MAKE_IMAGE_PATH(TEXT("DICOM\\IMAGE3.dcm")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   //Apply Sigma filter 
   nRet = L_MeanShiftFilterBitmap(&LeadBitmap, 5, 10, 0); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   //free bitmap 
   if (LeadBitmap.Flags.Allocated) 
      L_FreeBitmap(&LeadBitmap); 
 
   return SUCCESS; 
}