LBitmap::HighPassFilter
#include "ltwrappr.h"
L_INT LBitmap::HighPassFilter(uRadius, uOpacity)
|
L_UINT uRadius; |
/* radius of the neighborhood*/ |
|
L_UINT uOpacity; |
/* opacity */ |
Removes low frequency details in a bitmap, resulting in a sharpened image. This function is available in the Raster Pro and above toolkits.
|
Parameter |
Description |
|
uRadius |
Value greater than 0 that indicates the radius of the neighborhood on which the filter is applied, in pixels. |
|
uOpacity |
Value that represents the intensity of the effect. The valid range is from 0 to 100. At 100, only the object outlines remain. |
Returns
|
SUCCESS |
The function was successful. |
|
< 1 |
An error occurred. Refer to Return Codes. |
Comments
This filter removes low-frequency detail in the bitmap. The effect is opposite to that of the Gaussian Blur filter (LBitmap::GaussianFilter).
To increase the thickness of the edges, increase the value of uRadius. Usually a low value for uRadius is better.
Unlike the LBitmap::UnsharpMask function, when using this function image noise is not increased.
If the bitmap has a region, the effect will be applied on the region only.
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.
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
|
LTIMGEFX For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application. |
See Also
Example
L_INT LBitmap__HighPassFilterExample()
{
L_INT nRet;
LBitmap LeadBitmap;
nRet =LeadBitmap.Load(TEXT("C:\\Program Files\\LEAD Technologies, Inc\\LEADTOOLS 15.0\\Images\\IMAGE4.CMP"), 0,ORDER_BGR);
if(nRet !=SUCCESS)
return nRet;
nRet =LeadBitmap.HighPassFilter(10, 100);
if(nRet !=SUCCESS)
return nRet;
return SUCCESS;
}