L_EdgeDetectEffectBitmap
#include "l_bitmap.h"
L_INT EXT_FUNCTION L_EdgeDetectEffectBitmap(pBitmap, uLevel, uThreshold, uFlags)
pBITMAPHANDLE pBitmap; |
/* pointer to the bitmap handle */ |
L_UINT uLevel; |
/* edge weight */ |
L_UINT uThreshold; |
/* threshold value */ |
L_UINT uFlags; |
/* edges type */ |
Performs edge detection on the image.
Parameter |
Description |
|
pBitmap |
Pointer to the bitmap handle that references the bitmap on which to apply the effect. |
|
uLevel |
Level value used to determine the brightness of the edges. Standard value is 50. Range between 1 and 100. Big values will produce bright edges. |
|
uThreshold |
Threshold value used to determine which pixels are going to be filtered. If the difference determined for a pixel is less than this value, the pixel is set to 0. If the difference is greater, the filter will be applied to the pixel. The valid range is from 0 - 65535 for 64-bit, 48-bit and 16-bit grayscale images and from 0 - 4095 for 12-bit grayscale images. Otherwise, it is from 0 to 255. |
|
uFlags |
Flag that indicates the type of edge to generate. Possible values are: |
|
|
Value |
Meaning |
|
EDGE_SOFT |
[0] Generate softer (smoother) edges. |
|
EDGE_SOLID |
[1] Generate rougher edges. |
Returns
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
Comments
This function detects the edges in a bitmap and then replaces the values of edges by new values calculated according to the uFlags.
This function supports 12 and 16-bit grayscale images. Support for 12 and 16-bit grayscale images is available only in the Document/Medical toolkits.
To update a status bar or detect a user interrupt during execution of this function, refer to L_SetStatusCallback.
This function does not support signed data images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image is passed to this function.
Required DLLs and Libraries
LTIMG For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application. |
Platforms
Windows 95 / 98 / Me, Windows 2000 / XP.
See Also
Example
BITMAPHANDLE LeadBitmap; /* Bitmap handle for the image */
/* Load a bitmap at its own bits per pixel */
L_LoadBitmap (TEXT("IMAGE3.CMP"), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
/* Apply find edges effect on the image*/
L_EdgeDetectEffectBitmap(&LeadBitmap, 50, 0, EDGE_SOFT);