Plus : using the transform embedded in OpenIGTLink "IMAGE" messages

Support
1

Hi,

I am trying to use the transform embedded in OpenIGTLink “IMAGE” messages. In the Plus documentation about OpenIGTLink devices, it is specified about the ImageMessageEmbeddedTransformName attribute that :
ImageMessageEmbeddedTransformName If IMAGE message is received and this attribute is defined then the transform embedded in the message will be recorded as a transform, with the specified name (e.g., “ImageToReference”).

So I tried the following xml file:

<DataCollection StartupDelaySec="1.0" >

	<DeviceSet 
		Name="PlusServer: Verasonics image sending"
		Description="Broadcasting acquired ultrasound video acquired on the Verasonics system through OpenIGTLink" />

		<Device
			Id="Verasonics"
			Type="OpenIGTLinkVideo"        
			MessageType="IMAGE"
			ServerAddress="172.31.1.2"
			ServerPort="18944"
			IgtlMessageCrcCheckEnabled="false"
			ReconnectOnReceiveTimeout="false"
			UseReceivedTimestamps="false"
			AcquisitionRate="40"
			ReceiveTimeoutSec="30"
			SendTimeoutSec="30"
			ImageMessageEmbeddedTransformName="ImageToReference">
			<DataSources>
				<DataSource Type="Video" Id="Video" PortUsImageOrientation="MF"  />
			</DataSources>
			<OutputChannels>
				<OutputChannel Id="VideoStream" VideoDataSourceId="Video" />
			</OutputChannels>
		</Device> 

</DataCollection>

<PlusOpenIGTLinkServer 
	MaxNumberOfIgtlMessagesToSend="1" 
	MaxTimeSpentWithProcessingMs="50" 
	ListeningPort="18944" 
	SendValidTransformsOnly="true" 
	OutputChannelId="VideoStream" > 
	<DefaultClientInfo> 
		<MessageTypes> 
			<Message Type="IMAGE" />
		</MessageTypes>
		<ImageNames>
			<Image Name="Image" EmbeddedTransformToFrame="Reference" />
		</ImageNames>
	</DefaultClientInfo>
</PlusOpenIGTLinkServer>

With this setup file I have the following error :

|ERROR|075.812595| Unable to get custom transform status from name: ImageToReferenceTransformStatus| in /home/ldaunizeau/Devel/PlusServer/PlusBuild/PlusLib/src/PlusCommon/PlusTrackedFrame.cxx(488)

I don’t know what transform status are and I found no clue in the Plus documentation.
Thanks for your help !

2

Please submit this question to the Plus issue tracker. Attach the complete error log, because the root cause of the error might be shown in the few lines preceding the final error message that you included.

3

Hi, I have no news from Github, can you help ? Thanks a lot !

4

Related to: https://github.com/PlusToolkit/PlusLib/issues/504 and https://github.com/PlusToolkit/PlusLib/issues/459. Plus perform some checks on the “transformStatus” field which appeared with OpenIGTLink version 3 and does not exist in previous version of OpenIGTLink.