SkewDetection estimates the orientation angle (in degrees) of the lines of text.

Apply this method only to images that contains printed text.

SkewDetection can be very slow on large images, so applications can resample analyzed image using ResampleWidth parameter to enhance performance.

No resample is performed when ResampleWidth is zero.

Namespace: HiComponents.IEvolution
Assembly: IEvolution2 (in IEvolution2.dll) Version: 10.1.0.0

Syntax


	C#			Visual Basic			Visual C++

public double SkewDetection(
	int resampleWidth,
	int angleRange,
	double precision,
	bool edgeDetect
)

Public Function SkewDetection ( _
	resampleWidth As Integer, _
	angleRange As Integer, _
	precision As Double, _
	edgeDetect As Boolean _
) As Double

public:
double SkewDetection(
	int resampleWidth, 
	int angleRange, 
	double precision, 
	bool edgeDetect
)

angleRange: Int32
specifies the working range in degrees. Low values enhance performance and accuracy. For example specifing 30 SkewDetection will scan the image searching for pixels inside a range of -15 to 15 degrees. AngleRange can be from 1 to 180.

precision: Double
specifies the angle precision in degrees. It must be >0 and less or equal to 1 with only one decimal digit. Typical value is 0.1.

edgeDetect: Boolean
if true applies an edge detect algorithm before of skew detection.

The found angle of the text

Examples

CopyC#

double angle = Image.SkewDetection( Image.Width/4, 30, 0.1 );
Image.Rotate( angle, true );