L_AverageFilterBitmap

#include "l_bitmap.h"

L_LTIMGEFX_API L_INT L_AverageFilterBitmap(pBitmap, uDim)

pBITMAPHANDLE pBitmap;

/* pointer to the bitmap handle */

L_UINT uDim;

/* size of the averaging neighborhood */

Changes the color of each pixel in a bitmap to the average color of pixels in its neighborhood. This results in a blur effect.

Parameter

Description

pBitmap

Pointer to the bitmap handle referencing the bitmap to average.

uDim

Size of the averaging neighborhood. It is the length, in pixels, of one side of a square.

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

You control the amount of blur by specifying the size of the neighborhood that is used for averaging.

To update a status bar or detect a user interrupt during execution of this function, refer to L_SetStatusCallback.

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 signed data images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image is passed to this function.

Required DLLs and Libraries

LTIMGEFX

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

Windows 2000 / XP/Vista, Windows CE.

See Also

Functions:

L_SharpenBitmap, L_PosterizeBitmap, L_MosaicBitmap, L_EmbossBitmap, L_MedianFilterBitmap, L_AddBitmapNoise, L_IntensityDetectBitmap, L_SpatialFilterBitmap, L_BinaryFilterBitmap, L_MaxFilterBitmap, L_MinFilterBitmap, L_OilifyBitmap, L_SolarizeBitmap, L_DlgAverage, L_WindowLevel, L_BricksTextureBitmap, L_DeskewBitmap, L_DeskewBitmapExt, L_DiffuseGlowBitmap, L_GlowFilterBitmap, L_HalfTonePatternBitmap, L_HighPassFilterBitmap, L_MaskConvolutionBitmap, L_PerspectiveBitmap, L_PlasmaFilterBitmap, L_PointillistBitmap, L_FragmentBitmap, L_HighPassFilterBitmap, L_UnsharpMaskBitmap, L_DeskewCheckBitmap

Topics:

Raster Image Functions: Filtering Images

 

Removing Noise

Example

For complete sample code, refer to the CHILD.C module of the DEMO This example loads a bitmap and applies an average filter. example. 

 L_INT AverageFilterBitmapExample(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 (TEXT("C:\\Program Files\\LEAD Technologies\\LEADTOOLS 15\\Images\\IMAGE1.CMP"), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
   if(nRet !=SUCCESS)
      return nRet;
   /* Average with a neighborhood of 3x3 pixels */
   nRet = L_AverageFilterBitmap(&LeadBitmap, 3 );
   if(nRet !=SUCCESS)
      return nRet;
   nRet = L_SaveBitmap(TEXT("C:\\Program Files\\LEAD Technologies\\LEADTOOLS 15\\Images\\Result.BMP"), &LeadBitmap, FILE_BMP, 24, 0, NULL);
   if(nRet !=SUCCESS)
      return nRet;
   //free bitmap 
   if(LeadBitmap.Flags.Allocated)  
      L_FreeBitmap(&LeadBitmap);
   return SUCCESS;
}