The IsInverted Method is available as an add-on to the LEADTOOLS Document and Medical Imaging toolkits.
Gets a value that indicate whether this IOcrPage is inverted.
Syntax
| Visual Basic (Declaration) | |
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Function IsInverted() As Boolean | |
| Visual Basic (Usage) |  Copy Code |
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Dim instance As IOcrPage Dim value As Boolean value = instance.IsInverted() | |
| C# | |
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bool IsInverted() | |
| C++/CLI | |
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bool IsInverted(); | |
Return Value
true if this IOcrPage is inverted; otherwise, false.Example
Remarks
You can use this method to detect if the page is inverted (has white text over black background). This method will work on the processing version of the image inside the page (OcrPageType.Processing).
Use AutoPreprocess with OcrAutoPreprocessPageCommand.Invert to automatically invert the page image prior to calling IOcrPage.Recognize or RecognizeText. This could enhance the quality of the image before starting its recognition.
If the image is inverted, IsInverted will return true, if you call AutoPreprocess on the page, all subsequent calls to IsInverted will return false since the image is no inverted. Hence, you must use IsInverted before calling AutoPreprocess.
Requirements
Target Platforms: Microsoft .NET Framework 2.0, Windows 2000, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7