L_CannyEdgeDetectorBitmap

#include "l_bitmap.h"

L_LTIMGCOR_API L_INT L_CannyEdgeDetectorBitmap(pBitmap, pOptions)

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.

Parameters

pBITMAPHANDLE pBitmap

Pointer to the bitmap handle referencing the bitmap to be changed.

CANNYOPTIONS *pOptions

Pointer to the structure containing Canny edge detection options. This value cannot be null.

Returns

Value Meaning
SUCCESS The function was successful.
< 1 An error occurred. Refer to Return Codes.

Comments

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.

Required DLLs and Libraries

Platforms

Win32, x64, linux.

See Also

Functions

Topics

Example

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(TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\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(TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\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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