Imposes a binary filter on a bitmap.
#include "l_bitmap.h"
L_LTIMGEFX_API L_INT L_BinaryFilterBitmap(pBitmap, pFilter, uFlags)
Pointer to the bitmap handle that references the bitmap to be affected.
Pointer to the binary filter to use. You can use one of the following predefined filters:
Value | Meaning |
---|---|
BFLT_EROSION_OMNI BFLT_EROSION_HORZ BFLT_EROSION_VERT BFLT_EROSION_DIAG |
[#define] Shrinks black objects in the image. The effect is biased in the specified direction. |
BFLT_DILATION_OMNI BFLT_DILATION_HORZ BFLT_DILATION_VERT BFLT_DILATION_DIAG |
[#define] Enlarges black objects in the image. The effect is biased in the specified direction. |
Reserved for future use. Must be 0.
Value | Meaning |
---|---|
SUCCESS | The function was successful. |
< 1 | An error occurred. Refer to Return Codes. |
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 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.
Binary Filter Function - Before
Binary Filter Function - After
View additional platform support for this Binary Filter function.
Win32, x64, Linux.
For complete sample code, refer to the CHILD.C module of the DEMO example.
This example loads a bitmap and dilates its black objects.
L_INT BinaryFilterBitmapExample(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("Image1.jpg")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
if (nRet != SUCCESS)
return nRet;
/* Dilate black objects */
nRet = L_BinaryFilterBitmap(&LeadBitmap, BFLT_DILATION_OMNI, 0);
if (nRet != SUCCESS)
return nRet;
nRet = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &LeadBitmap, FILE_BMP, 24, 0, NULL);
if (nRet != SUCCESS)
return nRet;
//free bitmap
if (LeadBitmap.Flags.Allocated)
L_FreeBitmap(&LeadBitmap);
return SUCCESS;
}
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