L_MaxFilterBitmap

#include "l_bitmap.h"

L_LTIMGCOR_API L_INT L_MaxFilterBitmap(pBitmap, uDim)

pBITMAPHANDLE pBitmap;

/* pointer to the bitmap handle */

L_UINT uDim;

/* dimensions of the neighborhood (uDim x uDim), in pixels */

Erodes dark objects by the specified amount.

This function is available in the Document/Medical Toolkits.

Parameter

Description

pBitmap

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

uDim

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

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

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.

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 maximum value of its neighborhood.

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

Windows 2000 / XP/Vista, Windows CE.

See Also

Functions:

L_AddBitmapNoise, L_SharpenBitmap, L_PosterizeBitmap, L_MosaicBitmap, L_EmbossBitmap, L_AverageFilterBitmap, L_MedianFilterBitmap, L_IntensityDetectBitmap, L_SpatialFilterBitmap, L_BinaryFilterBitmap, L_MinFilterBitmap, L_OilifyBitmap, L_SolarizeBitmap, L_DlgMaxFilter, L_WindowLevel, L_HolesRemovalBitmapRgn, L_FragmentBitmap, L_HighPassFilterBitmap, L_UnsharpMaskBitmap

Topics:

Raster Image Functions: Filtering Images

 

Removing Noise

Example

This example loads a bitmap and applies a max filter to it. 

 L_INT MaxFilterBitmapExample(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;
   /* apply max filter */
   nRet = L_MaxFilterBitmap(&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;
}