FxSubtractBackground Method (GdPictureImaging)

In This Topic

Performs a Subtract Background (RollingBall) algorithm. It mainly is used for Medical Images like images of cells. The two parameters in the algorithm give you control over the size of the subtraction and the color of it. For more information please revise Stanley Sternberg's, â€œBiomedical Image Processingâ€, IEEE Computer, January 1983.

Syntax

Visual Basic
C#
Delphi
JScript
Managed Extensions for C++
C++/CLI

'Declaration
 
Public Function FxSubtractBackground( _
   ByVal ImageID As Integer, _
   ByVal RollingBallSize As Integer, _
   ByVal LightBackground As Boolean _
) As GdPictureStatus

public GdPictureStatus FxSubtractBackground( 
   int ImageID,
   int RollingBallSize,
   bool LightBackground
)

public function FxSubtractBackground( 
    ImageID: Integer;
    RollingBallSize: Integer;
    LightBackground: Boolean
): GdPictureStatus;

public function FxSubtractBackground( 
   ImageID : int,
   RollingBallSize : int,
   LightBackground : boolean
) : GdPictureStatus;

public: GdPictureStatus FxSubtractBackground( 
   int ImageID,
   int RollingBallSize,
   bool LightBackground
)

public:
GdPictureStatus FxSubtractBackground( 
   int ImageID,
   int RollingBallSize,
   bool LightBackground
)

Parameters

ImageID: GdPicture image identifier.
RollingBallSize: Size of ball rolled under the image. Controlled the amount of subtraction. Value >= 50.
LightBackground: Whether a background is lighter or not than the foreground. Value >= true.

Return Value

A member of the GdPictureStatus enumeration.

Example

Subtracting background from a jpeg image.

using (GdPictureImaging gdpictureImaging = new GdPictureImaging())
{
    // LoadInMemory parameter is set to true in order to be able to update the input file.
    int imageID = gdpictureImaging.CreateGdPictureImageFromFile("image.jpg", true);
 
    // Subtracting a background (RollingBall).
    gdpictureImaging.FxSubtractBackground(imageID, 10, false);
    gdpictureImaging.SaveAsPNG(imageID, "image.png");
    gdpictureImaging.ReleaseGdPictureImage(imageID);
}

Reference

GdPictureImaging Class
GdPictureImaging Members
SetROI Method
ResetROI Method
FxDespeckle Method
FxDespeckleMore Method