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EDGEDETECTORDLGPARAMS

typedef struct _EDGEDETECTORDLGPARAMS 
{ 
   L_UINT uStructSize; 
   pBITMAPHANDLE pBitmap; 
   L_BOOL bZoomToFit; 
   L_INT nThreshold; 
   L_UINT uFilter; 
   L_UINT32 uDlgFlags; 
   LTCOMMDLGHELPCB pfnHelpCallback; 
   L_VOID  *pHelpCallBackUserData; 
} EDGEDETECTORDLGPARAMS,  * LPEDGEDETECTORDLGPARAMS;

The EDGEDETECTORDLGPARAMS structure provides information used to initialize the dialog box created by the LDialogImageEffect::DoModalEdgeDetector function. After the user closes the dialog box, this structure is updated with information about the user's selections.

Members

uStructSize

Size of this structure, in bytes. Use the sizeof operator to calculate this value.

pBitmap

Ignored.

bZoomToFit

Flag that indicates the initial zoom level for previewing the image. Possible values are:

Value	Meaning
TRUE	Set the initial zoom level to "Zoom to fit".
FALSE	Set the initial zoom level to "Normal (1:1)".

nThreshold

Threshold value used to determine which pixels are edge pixels. Possible image values are:

If the image is	Unsigned	Signed
12-bit	0 to 4095	-2048 to +2047
16-bit gray, 48-bit, or 64-bit	0 to 65535	-32768 to +32767
Otherwise	0 to 255

uFilter

Flag that indicates which edge detection filter to apply. Possible values are:

Value	Meaning
EDG_SOBEL_VERT	[0x0101] Detect the vertical edges
EDG_SOBEL_HORZ	[0x0102] Detect the horizontal edges
EDG_SOBEL_ALL	[0x0103] Detect horizontal & vertical edges
EDG_PREWITT_VERT	[0x0201] Detect the vertical edges
EDG_PREWITT_HORZ	[0x0202] Detect the horizontal edges
EDG_PREWITT_ALL	[0x0203] Detect horizontal & vertical edges
EDG_LAPLACE_1	[0x0301] Detect vertical & horizontal edges
EDG_LAPLACE_2	[0x0302] Detect general edges
EDG_LAPLACE_3	[0x0303] Detect general edges. (The filter used for this option is different than the filter used for the EDG_LAPLACE_2 filter.)
EDG_LAPLACE_DIAG	[0x0304] Detect the diagonal edges
EDG_LAPLACE_HORZ	[0x0305] Detect the horizontal edges
EDG_LAPLACE_VERT	[0x0306] Detect the vertical edges
EDG_GRADIENT_N	[0x0401] Detect north edges
EDG_GRADIENT_NE	[0x0402] Detect north east edges
EDG_GRADIENT_E	[0x0403] Detect east edges
EDG_GRADIENT_SE	[0x0404] Detect south east edges
EDG_GRADIENT_S	[0x0405] Detect south edges
EDG_GRADIENT_SW	[0x0406] Detect south west edges
EDG_GRADIENT_W	[0x0407] Detect west edges
EDG_GRADIENT_NW	[0x0408] Detect north west edges