Performs Canny edge detection for the master channel of the image, or for one or more of the three colored channels (Red, Green, Blue) if the image is colored.
#include "l_bitmap.h"
L_LTIMGCOR_API L_INT L_CannyEdgeDetectorBitmap(pBitmap, pOptions)
Pointer to the bitmap handle referencing the bitmap to be changed.
Pointer to the structure containing Canny edge detection options. This value cannot be null.
Value | Meaning |
---|---|
SUCCESS | The function was successful. |
< 1 | An error occurred. Refer to Return Codes. |
This function supports 12 and 16-bit grayscale and 48-bit color images.
This function supports setting rectangle region.
To update a status bar or detect a user interrupt during execution of this function, refer to L_SetStatusCallback.
This function does not support 32-bit grayscale images. It returns the ERROR_GRAY32_UNSUPPORTED error code if a 32-bit grayscale image is passed to this function.
Win32, x64, Linux.
Performs Canny edge detection on the image.
L_INT CannyEdgeDetectorBitmapExample(L_VOID)
{
L_INT nRet;
BITMAPHANDLE LeadBitmap; /* Bitmap handle for the image */
CANNYOPTIONS Options;
Options.uHighThreshold = 5;
Options.uLowThreshold = 2;
Options.uRadius = 1;
/* Load a bitmap at its own bits per pixel */
nRet = L_LoadBitmap(MAKE_IMAGE_PATH(TEXT("cannon.jpg")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGRORGRAY, NULL, NULL);
if (nRet != SUCCESS)
return nRet;
/* Apply find edges effect on the image*/
nRet = L_CannyEdgeDetectorBitmap(&LeadBitmap, &Options);
if (nRet != SUCCESS)
return nRet;
nRet = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("cannon_Result.jpg")), &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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