TImageEnProc.SkewDetection

Declaration

function SkewDetection(ResampleWidth: Integer; AngleRange: Integer; Precision: Double; EdgeDetect: Boolean): Double;

Description

Estimates the orientation angle (in degrees) of lines of text. Apply this method only to images that contain printed text.
If an area is selected, SkewDetection will work only on the selection.

Parameter	Description
ResampleWidth	The width of the analysis image (set to 0 to analyze the image at its full size). SkewDetection can be very slow on large images, so it is recommended that images are resampled to a smaller size by setting ResampleWidth (e.g. specifying 800 will reduce the image to a width of 800 for analysis)
AngleRange	The maximum working range in degrees. For example, if you specify 30, SkewDetection will scan the image within the range of -15 to 15 degrees. A low value will enhance performance and accuracy. Permitted values are 1 to 180
Precision	The level of precision of the angle detection. Permitted range is 0.0 to 0.9 with only one decimal digit. Typical value is 0.1
EdgeDetect	Whether to apply an edge detection algorithm before calculating the orientation

Note: If the image PixelFormat is not ie24RGB or ie1g, it will be converted
◼SkewDetection uses an algorithm to calculate skew, rather than analyzing the document content. For more accurate skew detection use: getTextAngle

Demos

	Demos\ImageAnalysis\Orientator\Orientator.dpr
	Demos\ImageEditing\EveryMethod\EveryMethod.dpr

Example

// Load test image
ImageEnView1.IO.LoadFromFile( 'D:\TestImage.jpg' );

// Check for skew within the range -15 to 15 with 0.1 degrees of precision and automatically orient (for printed text)
d := ImageEnView1.Proc.SkewDetection( ImageEnView1.IEBitmap.Width div 4, 30, 0.1, false );
ImageEnView1.Proc.RotateAndCrop( d, ierBicubic );

TImageEnProc.SkewDetection