Store a videoinput in a Data Store Memory block in Simulink

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Timo on 15 Apr 2011
I'm trying to store a videoinput in a DataStoreMemory, so I can access it out of a Embedded MATLAB Function (fcn) block. I set the type to an expression (videoinput). But I got an error:
Error evaluating parameter 'OutDataTypeStr' in 'DataStoreImage/VideoInputDataStore': ADAPTORNAME and DEVICEID must be specified.
Can you help me? If I missed necessary information, please tell me.
Thanks Timo

Accepted Answer

Kaustubha Govind
Kaustubha Govind on 15 Apr 2011
I believe Data Store Memory only supports numeric types (see Section "Data type" on the documentation page).
Why not use the From Video Device block directly in your model?

More Answers (3)

Shankar Subramanian
Shankar Subramanian on 22 Apr 2011
Hi Timo,
Writing your own MATLAB function (using videoinput and getdata) and bringing into SIMULINK will not necessarily help you with the rate. You should actually run the script suggested here to calculate the frame rate in MATLAB.
The From Video Device block does not add any performance overhead and performs at par with the rate achievable within MATLAB using the hardware.

Timo on 15 Apr 2011
Hallo Kaustubha.
Thank you for your reply.
1. Ok! Thats bad. Do you know how I can store an object between the fcn block calls?
2. I have framerate Problems with this block. Try to solve this, by my own block. I don't know if this will help me, but I will try. Also I want to have more control over the image aqcuisation.
Thanks Timo
  1 Comment
Kaustubha Govind
Kaustubha Govind on 20 Apr 2011
Are you using the MATLAB Fcn block? You could try using persistent variables.

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Timo on 26 Apr 2011
Hallo Shankar,
Ok thanks! I thought I perhaps could write a more specialized function. I replyed also in the other Thread.
Thanks again, Timo

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