How to implement 'Medfilt1' function into Simulink

Hello everybody,

unfortunatelly I'm not finding the equivalent Simulink block of 'Medfilt1' function implemented in Matlab(R2010a).

Have you any suggestion to solve this problem?

I heard the possibility to use S-function in order to get an embedded Matlab function into Simulink, also if I don't know how I can do that.

Any advice is well accepted.

Thanks in advance.

Regards.

[Yash]

do you have the option of incorporating command windown options in it and link a M file to your mdl?

[Juster]

Sorry but I didn't understand your question? Can you please put it in another form.

Thanks

Answer 1

[Ryan]

If you have the Video and Image Processing Blockset, use the 2D median filter and change the "Neighborhood size" to 1xN or Nx1 (depending on the format of the 1D vector you're feeding in).

[Juster]

Unfortunatelly when I use the 2D Median Filter block I get the follow message:

Error reported by S-Function 'svipmdnfilter' in 'test/Median Filter': Unable to checkout a license for the Video and Image Processing Blockset

Any other ideas? For example with S-Function

Thank you for the answers

[Walter Roberson]

Do you in fact have a license for Video and Image Processing Blockset ?

[Juster]

From the message I got I think no.

In fact I ask if there is another way, in order tu use the medfilt1 function in Simulink.

Thanks in andvance,

Regards

[Ryan]

If you do not have the tool box then you'll probably need to use the S-Function feature you mentioned (although I have personally never used it). There are examples that come with Matlab for those that can be browsed through the Simulink UI. I don't believe Simulink offers other methods for non-linear filtering (at least not for 2009b).

You might be able to figure out a more convoluted method using the 'sort' block from the signal processing toolbox, but using the s-function will most likely be faster or at least less frustrating.

[Juster]

So I will try to open another question where someone can help me to create an S-function equivalent to medfilt1 function.

Best regards