L_MeanShiftFilterBitmap (original) (raw)

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.

L_UINT32 uFlags

Reserved for future use. Must be 0.

Returns

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.

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("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; }

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