LBitmap::SpatialFilter

#include "ltwrappr.h"

virtual L_INT LBitmap::SpatialFilter(pFilter);

Imposes a spatial filter on the class object's bitmap. You can supply your own filter or use one of the predefined filters.

Returns

Comments

Imposes a spatial filter on the class object's bitmap. You can supply your own filter or use one of the predefined filters. A spatial filter recomputes the brightness of each pixel in a bitmap by using a weighted averaging technique that considers the surrounding pixels. Spatial filters are used for operations such as sharpening an image or detecting edges within the image.

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 only in the Document/Medical toolkits.

The LBitmap::SpatialFilter function works best with 24-bit, 16-bit, or grayscale bitmaps. If a bitmap uses a color palette, this function matches the new brightness value of each pixel to the nearest color in the existing palette.

To update a status bar or detect a user interrupt during execution of this function, refer to LBase::EnableStatusCallback.

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.

Required DLLs and Libraries

See Also

Example

L_INT LBitmap__SpatialFilterExample()
{
   L_INT nRet;
   LBitmap LeadBitmap;
   nRet =LeadBitmap.Load(TEXT("C:\\Program Files\\LEAD Technologies, Inc\\LEADTOOLS 15.0\\Images\\image1.cmp"), 0,ORDER_BGR);
   if(nRet !=SUCCESS)
      return nRet;
   return LeadBitmap.SpatialFilter(FLT_PREWITT_HORZ);
}