L_MeanShiftFilterBitmap

#include "l_bitmap.h"

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

pBITMAPHANDLE pBitmap;

pointer to the bitmap handle

L_INT nRadius;

size of kernel

L_UINT nColorDistance;

color difference

L_UINT32 uFlags;

flags

Performs noise reduction while preserving detail.

Parameter

Description

pBitmap

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

nRadius

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

nColorDistance

Color difference between the investigated pixel and the source pixel.

uFlags

Reserved for future use. Must be 0.

Returns

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.

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.

See Also

Functions:

L_HistoEqualizeBitmap, L_ChangeBitmapContrast, L_ChangeBitmapIntensity, L_GammaCorrectBitmap, L_HistoContrastBitmap, L_StretchBitmapIntensity, L_InvertBitmap, L_ChangeBitmapHue, L_ChangeBitmapSaturation, L_FillBitmap, L_GetPixelColor, L_PutPixelColor, L_GetBitmapHistogram, L_WindowLevel, L_LocalHistoEqualizeBitmap, L_ChangeHueSatIntBitmap, L_AdjustBitmapTint, L_GammaCorrectBitmapExt

Topics:

Raster Image Functions: Filtering Images

 

Removing Noise

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("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; 
} 

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