Store a videoinput in a Data Store Memory block in Simulink

Hello,

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

Answer 1

[Kaustubha Govind]

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?

Answer 2

[Shankar Subramanian]

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.

Thanks

Shankar

Answer 3

[Timo]

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

[Kaustubha Govind]

Are you using the MATLAB Fcn block? You could try using persistent variables.

Answer 4

[Timo]

Hallo Shankar,

Ok thanks! I thought I perhaps could write a more specialized function. I replyed also in the other Thread.

Thanks again, Timo