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Available in LEADTOOLS Imaging Pro, Vector, Document, and Medical Imaging toolkits. |
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Available in LEADTOOLS Imaging Pro, Vector, Document, and Medical Imaging toolkits. |
L_UserFilterBitmap
#include "l_bitmap.h"
L_LTIMGEFX_API L_INT L_UserFilterBitmap (pBitmap, pFilter, uFlags);
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pBITMAPHANDLE pBitmap; |
/* pointer to the bitmap handle */ |
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pUSERFLT pFilter; |
/* pointer to a structure */ |
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L_UINT32 uFlags; |
/* flags*/ |
Filters the bitmap based on a user-defined filter / mask. This function is similar to the spatial and binary filter functions.
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Parameter |
Description |
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pBitmap |
Pointer to the bitmap handle that references the bitmap on which to apply the effect. |
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pFilter |
Pointer to an USERFLT structure that contains information about the mask to be applied. |
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uFlags |
Reserved for future use. Must be 0. |
Returns
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SUCCESS |
The function was successful. |
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< 1 |
An error occurred. Refer to Return Codes. |
Comments
With this function you can create a user-defined filter and apply it to the image. The selected filter is passed as a parameter to this function. The filter has a rectangular form (matrix) where the values are user-defined. It allows the creation of simple customized filters, where each value found in matrix is multiplied by the corresponding pixel, and then the specified operation is performed on the results.
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.
When the filter is applied to pixels from the edge and you choose the sum operation, the edge rows and columns are duplicated. For example, if the pixel (-1, 5) is needed, the pixel (0, 5) is used instead.
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
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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
Example
In this example the high pass filter will be applied using user defined matrix
#if defined (LEADTOOLS_V16_OR_LATER)
L_INT UserFilterBitmapExample(L_VOID)
{
L_INT nRet;
BITMAPHANDLE LeadBitmap; /* Bitmap handle for the image */
pUSERFLT pFilter;
L_INT i, j;
/* Load a bitmap at its own bits per pixel */
nRet = L_LoadBitmap (TEXT("%UserProfile%\\My Documents\\LEADTOOLS Images\\IMAGE1.CMP"), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
if(nRet !=SUCCESS)
return nRet;
/* Allocate the user filter structure. And also we need a (3x3) matrix with 9 elements. */
pFilter = (pUSERFLT)malloc(sizeof(USERFLT) + 9 * sizeof(L_INT));
/* Initialize the array with factor used to apply the high pass filter */
for(i = 0; i < 3; i++)
{
for(j = 0; j < 3; j++)
{
if(j == 1 || i == 1)
{
if(j == 1 && i == 1)
pFilter->ufltMatrix[i * 3 + j] = 5;
else
pFilter->ufltMatrix[i * 3 + j] = -1;
}
else
pFilter->ufltMatrix[i * 3 + j] = 0;
}
}
pFilter->uStructSize = sizeof(USERFLT);
pFilter->ufltWidth = 3;
pFilter->ufltHeight = 3;
pFilter->ufltCenter.x = 1;
pFilter->ufltCenter.y = 1;
pFilter->ufltDivisor = 1;
pFilter->nfltOffset = 0;
pFilter->ufltFlag = UD_SUM;
/* Apply the high pass custom filter */
nRet = L_UserFilterBitmap (&LeadBitmap, pFilter, 0);
if(nRet !=SUCCESS)
return nRet;
/* Free the filter */
free(pFilter);
nRet = L_SaveBitmap(TEXT("%UserProfile%\\My Documents\\LEADTOOLS 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;
}
#else
L_INT UserFilterBitmapExample(L_VOID)
{
L_INT nRet;
BITMAPHANDLE LeadBitmap; /* Bitmap handle for the image */
pUSERFLT pFilter;
L_INT i, j;
/* Load a bitmap at its own bits per pixel */
nRet = L_LoadBitmap (TEXT("%UserProfile%\\My Documents\\LEADTOOLS Images\\IMAGE1.CMP"), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
if(nRet !=SUCCESS)
return nRet;
/* Allocate the user filter structure. And also we need a (3x3) matrix with 9 elements. */
pFilter = (pUSERFLT)malloc(sizeof(USERFLT) + 9 * sizeof(L_INT));
/* Initialize the array with factor used to apply the high pass filter */
for(i = 0; i < 3; i++)
{
for(j = 0; j < 3; j++)
{
if(j == 1 || i == 1)
{
if(j == 1 && i == 1)
pFilter->ufltMatrix[i * 3 + j] = 5;
else
pFilter->ufltMatrix[i * 3 + j] = -1;
}
else
pFilter->ufltMatrix[i * 3 + j] = 0;
}
}
pFilter->uStructSize = sizeof(USERFLT);
pFilter->ufltWidth = 3;
pFilter->ufltHeight = 3;
pFilter->ufltCenter.x = 1;
pFilter->ufltCenter.y = 1;
pFilter->ufltDivisor = 1;
pFilter->nfltOffset = 0;
pFilter->ufltFlag = UD_SUM;
/* Apply the high pass custom filter */
nRet = L_UserFilterBitmap (&LeadBitmap, pFilter);
if(nRet !=SUCCESS)
return nRet;
/* Free the filter */
free(pFilter);
nRet = L_SaveBitmap(TEXT("%UserProfile%\\My Documents\\LEADTOOLS 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;
}
#endif // LEADTOOLS_V16_OR_LATER