ConvertTo1BppSauvola(Int32,Single) Method
In This Topic
Converts a GdPicture image to a 1-bit (black and white) bitmap using the Sauvola local adaptive thresholding method. This method is particularly efficient on documents with poor contrast.
Syntax
'Declaration
Public Overloads Function ConvertTo1BppSauvola( _
ByVal As Integer, _
ByVal As Single _
) As GdPictureStatus
public GdPictureStatus ConvertTo1BppSauvola(
int ,
float
)
public function ConvertTo1BppSauvola(
: Integer;
: Single
): GdPictureStatus;
public function ConvertTo1BppSauvola(
: int,
: float
) : GdPictureStatus;
public: GdPictureStatus ConvertTo1BppSauvola(
int ,
float
)
public:
GdPictureStatus ConvertTo1BppSauvola(
int ,
float
)
Parameters
- ImageID
- GdPicture image identifier.
- Factor
- Factor of thresholding reduction. Must be a balue in tha range ]0 ; 1. Suggested value is 0.35. Higher is the factor value lighter should be the resulting image.
Return Value
A member of the GdPictureStatus enumeration.
Example
Converts selected image to a 1-bit BW indexed color image, and saves result into a TIF file.
using (GdPictureImaging gdpictureImaging = new GdPictureImaging())
{
// Open an image file. An empty string allows the control to prompt for selecting a file.
int imageID = gdpictureImaging.CreateGdPictureImageFromFile("");
gdpictureImaging.ConvertTo1BppSauvola(imageID, 0.35f);
gdpictureImaging.SaveAsTIFF(imageID, "output.tif", TiffCompression.TiffCompressionAUTO);
// Release used resources.
gdpictureImaging.ReleaseGdPictureImage(imageID);
}
Example
Converts selected image to a 1-bit BW indexed color image, and saves result into a TIF file.
using (GdPictureImaging gdpictureImaging = new GdPictureImaging())
{
// Open an image file. An empty string allows the control to prompt for selecting a file.
int imageID = gdpictureImaging.CreateGdPictureImageFromFile("");
gdpictureImaging.ConvertTo1BppSauvola(imageID, 0.35f);
gdpictureImaging.SaveAsTIFF(imageID, "output.tif", TiffCompression.TiffCompressionAUTO);
// Release used resources.
gdpictureImaging.ReleaseGdPictureImage(imageID);
}
See Also
