Plus applications user manual  2.9.0.d0fd355
Software library for tracked ultrasound image acquisition, calibration, and processing.
Virtual Text Recognizer

This device can recognize text (in the language specified by Language) from a number of input channels.

Device configuration settings

  • element.png
    Device
    • attribute.png
      Type = "VirtualTextRecognizer"
      required.png
    • attribute.png
      Language Language to be recognized.
      optional.png
      Default = "eng"
    • attribute.png
      TessdataDirectory Path to the parent of the "tessdata" directory containing the language files. If this is not set, it will default to the "TESSDATA_PREFIX" environment variable.
      optional.png
      Default = " "
    • element.png
      TextFields Multiple Field child elements are allowed, one for each parameter to recognize
      required.png
      • element.png
        Field
        required.png
        • attribute.png
          Channel The input channel to pull data from for recognition.
          required.png
        • attribute.png
          Name Name of the variable to broadcast on detected change
          required.png
        • attribute.png
          InputRegionOrigin The origin in the input image to extract a sub-image
          required.png
        • attribute.png
          InputRegionSize The size of the subimage to extract
          required.png
    • element.png
      InputChannels Multiple InputChannel child elements are allowed, one for each input channel to be available to query
      required.png
      • element.png
        InputChannel
        required.png
      • attribute.png
        Id The id of this input channel
        required.png

Example configuration file PlusDeviceSet_PlusServer_tesseract.xml

<PlusConfiguration version="2.3">
<DataCollection StartupDelaySec="1.0">
<DeviceSet
Name="PlusServer: Text recognition sample on saved data"
Description="Broadcasting acquired video through OpenIGTLink" />
<Device
Id="TrackedVideoDevice"
Type="SavedDataSource"
SequenceFile="ie33_biplane_LeftCaptureDevice_compressed.igs.mha"
UseData="IMAGE_AND_TRANSFORM"
UseOriginalTimestamps="FALSE"
RepeatEnabled="TRUE" >
<DataSources>
<DataSource Type="Video" Id="Video" PortUsImageOrientation="MFA"/>
</DataSources>
<OutputChannels>
<OutputChannel Id="TrackedVideoStream" VideoDataSourceId="Video" />
</OutputChannels>
</Device>
<Device
Id="TextRecognizerDevice"
Type="VirtualTextRecognizer"
MissingInputGracePeriodSec="1"
Language="eng" >
<DataSources>
<DataSource Type="FieldData" Id="ScreenFields"/>
</DataSources>
<TextFields>
<Field Channel="TrackedVideoStream" Name="patient-last-name" InputRegionOrigin="260 885" InputRegionSize="82 20" />
<Field Channel="TrackedVideoStream" Name="tee-temperature" InputRegionOrigin="75 185" InputRegionSize="55 20" />
</TextFields>
<InputChannels>
<InputChannel Id="TrackedVideoStream" />
</InputChannels>
<OutputChannels>
<OutputChannel Id="DataChannel">
<DataSource Id="ScreenFields"/>
</OutputChannel>
</OutputChannels>
</Device>
<Device
Id="Mixer"
Type="VirtualMixer" >
<InputChannels>
<InputChannel Id="DataChannel" />
<InputChannel Id="TrackedVideoStream" />
</InputChannels>
<OutputChannels>
<OutputChannel Id="TrackedVideoStreamData"/>
</OutputChannels>
</Device>
</DataCollection>
<CoordinateDefinitions>
<Transform From="Image" To="Probe"
Matrix="
1 0 0 0
0 1 0 0
0 0 1 0
0 0 0 1"/>
</CoordinateDefinitions>
<PlusOpenIGTLinkServer
MaxNumberOfIgtlMessagesToSend="1"
MaxTimeSpentWithProcessingMs="50"
ListeningPort="18944"
SendValidTransformsOnly="true"
OutputChannelId="TrackedVideoStreamData" >
<DefaultClientInfo>
<MessageTypes>
<Message Type="STRING" />
<Message Type="IMAGE" />
<Message Type="TRANSFORM" />
</MessageTypes>
<StringNames>
<String Name="patient-last-name" />
<String Name="tee-temperature" />
</StringNames>
<TransformNames>
<Transform Name="ProbeToReference" />
<Transform Name="StylusToReference" />
<Transform Name="ReferenceToTracker" />
</TransformNames>
<ImageNames>
<Image Name="Image" EmbeddedTransformToFrame="Reference" />
</ImageNames>
</DefaultClientInfo>
</PlusOpenIGTLinkServer>
</PlusConfiguration>