DeskewDetectionDataFlags Enumeration

Summary

Flags that indicate whether to deskew the image, which background color to use, whether to deskew the image if the skew angle is very small, which type of interpolation to use, whether the image contains mostly text, and whether to use normal or fast rotation. This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.

Syntax

C++/CLI

Python

[FlagsAttribute()] 
public enum DeskewDetectionDataFlags

public: 
   [FlagsAttribute] 
   enum class DeskewDetectionDataFlags sealed

class DeskewDetectionDataFlags(Enum): 
   DocumentImage = 0 
   DocumentImage = 0 
   DocumentImage = 0 
   DocumentImage = 0 
   RotateLinear, UseSelectiveDetection, None, ReturnAngleOnly = 1 
   RotateLinear, UseSelectiveDetection, None, DoNotFillExposedArea = 16 
   RotateLinear, UseSelectiveDetection, None, Threshold = 256 
   RotateLinear, UseSelectiveDetection, None, RotateResample = 4096 
   RotateLinear, UseSelectiveDetection, None, RotateBicubic = 8192 
   RotateLinear, UseSelectiveDetection, None, DocumentAndPictures = 65536 
   RotateLinear, UseSelectiveDetection, None, UseHighSpeedRotate = 1048576 
   RotateLinear, UseSelectiveDetection, None, UseCheckDeskew = 16777216 
   RotateLinear, UseSelectiveDetection, None, UseLineDetectionCheckDeskew = 33554432 
   RotateLinear, UseSelectiveDetection, None, UseExtendedDeskew = 67108864 
   RotateLinear, UseSelectiveDetection, None, DoNotPerformPreProcessing = 268435456 
   RotateLinear, UseSelectiveDetection, None, UseNormalDetection = 536870912

Members

Value	Member	Description
0x00000000	UseSelectiveDetection	Use the selective detection technique which is faster.
0x00000000	DocumentImage	The image contains only text.
0x00000000	RotateLinear	Do not perform any interpolation methods when rotating.
0x00000000	None	Use the default settings, such as processing image, applying linear interpolation to rotate the image, and running Document image algorithm.
0x00000001	ReturnAngleOnly	Do not deskew (rotate) the image. Use this flag to find the angle of rotation.
0x00000010	DoNotFillExposedArea	Determine the suitable background color for fill areas exposed by rotation automatically. The FillColor is ignored.
0x00000100	Threshold	Do not deskew the image if the deskew angle is very small (less than 0.5 degrees).
0x00001000	RotateResample	Perform bilinear interpolation when rotating.
0x00002000	RotateBicubic	Perform bicubic interpolation when rotating.
0x00010000	DocumentAndPictures	The image contains text and pictures or light text.
0x00100000	UseHighSpeedRotate	Use fast rotation speed (moderate quality, only for 1-bit images).
0x01000000	UseCheckDeskew	Use the bank check algorithm to deskew the image. This algorithm considers many features common to standard bank checks in order to determine orientation.
0x02000000	UseLineDetectionCheckDeskew	Use the bank check line detection algorithm to deskew the image.
0x04000000	UseExtendedDeskew	Increase the possible deskew angle (from 10 degrees to 45 degrees in either direction). In addition, it adds the capability to specify the resolution of the rotation step.
0x10000000	DoNotPerformPreProcessing	Do not perform pre-processing on the image before deskewing it.
0x20000000	UseNormalDetection	Do not use the selective detection technique which is more accurate.

Remarks

You can use a bitwise OR ( | ) to specify one flag from each of the following groups:

Group	Flags
Flags that indicate whether to deskew the image after the method finds the skew angle.	ReturnAngleOnly
Flags that indicate which background color to use.	DoNotFillExposedArea
Flags that indicate whether to deskew the image if the skew angle is very small.	Threshold
Flags that specify which type of interpolation to use.	RotateLinear, RotateResample, RotateBicubic
Flags that indicate whether the image contains mostly text, or text and pictures.	DocumentImage, DocumentAndPictures

Example

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Core; 
 
public void DetectDeskewOrientationCommandExample() 
{ 
   // Load an image  
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, @"Forms\Forms to be Recognized\OCR\FCC-107_OCR_Filled.tif")); 
 
   // Prepare the command  
   DetectDeskewOrientationCommand command = new DetectDeskewOrientationCommand(); 
   // Detect/correct skew and orientation, filling with black  
   command.DeskewDetection.FillColor = RasterColor.Black; 
   command.DeskewDetection.Flags = DeskewDetectionDataFlags.DocumentAndPictures | DeskewDetectionDataFlags.RotateBicubic; 
   command.Flags = DetectDeskewOrientationCommandFlags.None; 
   command.OrientationDetection.Flags = OrientationDetectionDataFlags.None; 
   command.Run(image);  
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}

Requirements

Target Platforms

Reference

Leadtools.ImageProcessing.Core Namespace

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Leadtools.ImageProcessing.Core Assembly

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