AutoDeskew(Int32,Single,GdPictureColor) Method

In This Topic

Tries to deskew a GdPicture image to about Â± specified degrees. This method enables to specify the background color to use. Deskewing an image can help a lot to do OCR, OMR, barcode detection or just improve the readability of an image.

Syntax

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

'Declaration
 
Public Overloads Function AutoDeskew( _
   ByVal ImageID As Integer, _
   ByVal MaxAngleOfResearch As Single, _
   ByVal BackColor As GdPictureColor _
) As GdPictureStatus

public GdPictureStatus AutoDeskew( 
   int ImageID,
   float MaxAngleOfResearch,
   GdPictureColor BackColor
)

public function AutoDeskew( 
    ImageID: Integer;
    MaxAngleOfResearch: Single;
    BackColor: GdPictureColor
): GdPictureStatus;

public function AutoDeskew( 
   ImageID : int,
   MaxAngleOfResearch : float,
   BackColor : GdPictureColor
) : GdPictureStatus;

public: GdPictureStatus AutoDeskew( 
   int ImageID,
   float MaxAngleOfResearch,
   GdPictureColor BackColor
)

public:
GdPictureStatus AutoDeskew( 
   int ImageID,
   float MaxAngleOfResearch,
   GdPictureColor BackColor
)

Parameters

ImageID: GdPicture image identifier.
MaxAngleOfResearch: Maximum angle of research. IE: set 10 to perform a skew research about Â±10 degrees. A value lower than 15 is suggested. Value used by other overloads is 15.
BackColor: Color to use to fill background. A suitable color value can be obtained by using the ARGB() method.

Return Value

A member of the GdPictureStatus enumeration.

Remarks

Deskewing often results in "padding" surrounding the image where the dimensions of the image were extended because of the rotation. This method offers a fill color for this padding, so that if you specify it to be the same as the original background color, the deformities would not show.

Example

Deskewing a tiff image.

using (GdPictureImaging gdpictureImaging = new GdPictureImaging())
{
    int imageID = gdpictureImaging.CreateGdPictureImageFromFile("skewed.tif");
 
    gdpictureImaging.AutoDeskew(imageID, 15, gdpictureImaging.ARGB(255, 255, 255, 255));
 
    // Let's encode the new tiff with the same mode used by the input image.
    TiffCompression tiffCompression = gdpictureImaging.GetTiffCompression(imageID);
 
    gdpictureImaging.SaveAsTIFF(imageID, "deskewed.tif", tiffCompression);
    gdpictureImaging.ReleaseGdPictureImage(imageID);
}

Reference

GdPictureImaging Class
GdPictureImaging Members
Overload List
GetSkewAngle(Int32,Single) Method