how to convert MATLAB code to c code for a functions which is using a string as a parameters?

HI!

Firstly, I'm really surprised Mathwork's fast update for Image Processing Toolbox functions for MATLAB code generator. It's pretty awesome.

Now I'm in big trouble on code generator......

When i try to use morphological filters ( like imopen, imdelation, imelode... ), we use 'strel' function to make elements

and I'm trying to convert strel function on matlab to c code

but the code generator said "All inputs must be constant."

because input parameter of strel function is string which means type of element

I think this string causes this error......

.

how can i solve this problem????

plz help me

thx

[Troy Cumbo]

Is the radius of your strel function a constant value, or is it a variable?

In my experience with Coder, the app will correctly generate code if the arguments to strel are constants. Moreover, your structuring element must also be a constant in order for it to be used by the morphological functions (imopen, etc.).

So while this should work:

X = strel('disk', 5);

This will not:

X = strel(sStrelType, dStrelSize);

If you need variable-sized structuring elements, this can be a real pain, because you can't even make arrays of strels. I worked around those limitations by constructing several constant structuring elements and then using them in separate imtophat calls in the case branches of a switch statement. Very unpretty, but it works.