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VNRecognizeTextRequestMBS class

Super class: VNImageBasedRequestMBS

// we like to find text on the image
Var request As New VNRecognizeTextRequestMBS
Var requests() As VNRequestMBS = Array(request)

Var file As FolderItem = SpecialFolder.Desktop.Child("image0.jpeg")
Var imageRequestHandler As VNImageRequestHandlerMBS = VNImageRequestHandlerMBS.RequestWithFile(file)

// perform request synchronously. Asynchronously with callback is also possible
Var error As NSErrorMBS
Var r As Boolean = imageRequestHandler.performRequests(requests, error)

If r Then
  
  Var results() As VNObservationMBS = request.results
  Var result As VNObservationMBS = results(0)
  If result IsA VNRecognizedTextObservationMBS Then
    Var hresult As VNRecognizedTextObservationMBS = VNRecognizedTextObservationMBS(result)
    // show first text
    MessageBox hresult.String
  End If
End If

• 5 properties
  • property automaticallyDetectsLanguage as Boolean   New in 26.1
  • property indeterminate as Boolean
  • property minimumTextHeight as Double
  • property recognitionLevel as Integer
  • property usesLanguageCorrection as Boolean
• 6 methods
  • method Constructor(DelegateHandler as VNRequestCompletedMBS = nil, tag as variant = nil)
  • method customWords as String()
  • method recognitionLanguages as String()
  • method setCustomWords(customWords() as String)
  • method setProgressHandler(ProgressHandler as VNProgressHandlerMBS, tag as variant = nil)
  • method setRecognitionLanguages(recognitionLanguages() as String)
• 3 shared methods
  • shared method available as Boolean
  • shared method supportedRecognitionLanguages(recognitionLevel as Integer, byref error as NSErrorMBS) as String()
  • shared method supportedRecognitionLanguages(recognitionLevel as Integer, requestRevision as Integer, byref error as NSErrorMBS) as String()
• 2 constants

Recognition Levels

Super class VNImageBasedRequestMBS

• property regionOfInterest as CGRectMBS
• method Constructor   Private

Super class VNRequestMBS

• 7 properties
  • property className as String
  • property ClassPath as String
  • property description as String
  • property Handle as Integer
  • property preferBackgroundProcessing as Boolean
  • property revision as Integer
  • property usesCPUOnly as Boolean
• 4 methods
  • method cancel
  • method Constructor   Private
  • method copy as VNRequestMBS
  • method results as VNObservationMBS()
• 3 shared methods
  • shared method currentRevision as Integer
  • shared method defaultRevision as Integer
  • shared method supportedRevisions as NSIndexSetMBS

This class has no sub classes.

Blog Entries

• MBS Xojo Plugins, version 26.1pr1
• XDevMag: Text Recognition
• Vision Framework for Xojo

Xojo Developer Magazine

• 22.4, pages 56 to 57: Text Recognition, Using Apple's Vision to Extract Text from an Image by Stefanie Juchmes-Simonis

Release notes

• Version 26.1
  • Added automaticallyDetectsLanguage property to VNRecognizeTextRequestMBS class.

Some related classes:

• class CGRectMBS
• class NSErrorMBS
• class NSIndexSetMBS
• class VNImageBasedRequestMBS
• class VNImageRequestHandlerMBS
• class VNObservationMBS
• class VNRecognizedTextObservationMBS
• class VNRequestMBS

The items on this page are in the following plugins: MBS MacFrameworks Plugin.

VNRecognizedTextObservationMBS   -   VNRectangleObservationMBS