ROS2 unable to use "Write Image" block = error in WriteImageFcnBlock.m

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Dylan
Dylan 2024-4-18
评论： Dylan 2024-4-19
Hi everyone - I am trying out the ROS2 toolbox for Simulink, and can't successfully use the ROS2 Write Image block. I have loaded a demo image to the workspace using testImg = imread("free-images.jpg"), and it is loading as a 800x1200x3 uint8 variable. I have loaded it into Simulink using "Image From Workspace", and sent it into the ROS2 Write Image block with rgb8 encoding. Unfortunately I get the error below, and other encoding options also don't work. Any help? I have attached the error and setup below.
An error occurred during simulation and the simulation was terminated
Caused by:
Index exceeds array dimensions. Index value 129 exceeds valid range [1-128].
Error in WriteImageFcnBlock.m (line 25)
Data(1:DataLength) = Data1(1:DataLength);
Error in 'aprilTagTest/Write Image/MATLAB Function' (line 30)

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采纳的回答

Jagadeesh Konakalla
Hi Dylan,
Please follow the example on how to access variable length array ROS messages in Simulink. You need to set the Maximum Size of a Variable-length Array in your Simulink model.
Work with ROS Messages in Simulink - MATLAB & Simulink (mathworks.com)
Thanks and regards,
Jagadeesh K
  2 个评论
Dylan
Dylan 2024-4-19
Out of curiosity, is there a way to dynamically set the size of the relevant variable-length array based on a variable from the workspace?

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