#include "l_bitmap.h"
L_LTIMGEFX_API L_INT L_EdgeDetectStatisticalBitmap(pBitmap, uDim, nThreshold, crEdgeColor, crBkColor, uFlags)
pBITMAPHANDLE pBitmap; |
pointer to the bitmap handle |
L_UINT uDim; |
dimensions of the edge detector neighborhood |
L_INT nThreshold; |
threshold value |
COLORREF crEdgeColor; |
color value |
COLORREF crBkColor; |
color value |
L_UINT32 uFlags; |
flags |
Detects edges by examining the variation of colors in all directions using statistical indices.
Parameter |
Description |
pBitmap |
Pointer to the bitmap handle that references the bitmap in which the edge detector is applied. |
uDim |
Dimensions of the neighborhood used to detect edges (uDim x uDim), in pixels. |
nThreshold |
Threshold value used to determine which pixels are edge pixels. If the difference determined by the edge detector algorithm for a pixel is greater than this value, the pixel is an edge pixel. |
crEdgeColor |
The COLORREF value that specifies the edge color. You can specify a COLORREF value, such as the return value of the Windows RGB macro, or you can use the PALETTEINDEX macro to specify a palette color. |
crBkColor |
The COLORREF value that specifies the non edge color. You can specify a COLORREF value, such as the return value of the Windows RGB macro, or you can use the PALETTEINDEX macro to specify a palette color. |
uFlags |
Reserved for future use. Must be 0. |
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
The edges are detected by applying a statistical filter that analyzes the variations of colors in all directions around each pixel.
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.
The threshold range for 16, 48 and 64-bit images is from 0 to 65535 for unsigned images, and from –32768 to +32767 for signed images. For 12-bit images, the threshold range is from 0 to 4095 for unsigned images, and from –2048 to +2047 for signed images. Otherwise, it is from 0 to 255. The threshold is applied to channels separately.
Required DLLs and Libraries
For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application. |
Win32, x64, Linux.
The following example loads a bitmap and applies an edge detector statistical function
#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName
L_INT EdgeDetectStatisticalBitmapExample(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("ImageProcessingDemo\\NaturalFruits.jpg")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
if(nRet !=SUCCESS)
return nRet;
/* Apply an edge detector statistical function */
nRet = L_EdgeDetectStatisticalBitmap(&LeadBitmap, 15, 128, RGB(255, 255, 255), RGB(0, 0, 0), 0);
if(nRet !=SUCCESS)
return nRet;
//free Bitmap
if(LeadBitmap.Flags.Allocated)
L_FreeBitmap(&LeadBitmap);
return SUCCESS;
}
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