Filtering a ROI using Simulink

Hi,

I need to filter an ROI that contains an object using median filter and convert it to binary image for Blob Analysis. I created the ROI using Autothreshold block and I tried with following code using MATLAB Function block:

function BW2 = filtroi(I,roi)

coder.extrinsic('strel');
coder.extrinsic('roifilt2')
coder.extrinsic('fspecial')
coder.extrinsic('im2bw');

BW2 = false(size(I));

k = fspecial('average');  %I could not find median-filter kernel

if isempty(find(roi)) == true

      I2 = I;

else

I2 = roifilt2(k,I,roi);

end

BW2 = im2bw(I2);

but the visualization (to Video Display block) doesn't show the resulting bw image. Some suggest?

[Bruno Pop-Stefanov]

Would you mind attaching your model file to the question? Thank you.

[Marco]

sorry I'm late. Thanks for reply; this is the model

the problem is that ROI is nonzero-regions of BW image. PS: inside MATLAB fcn block there is above code as far as I2 creation.

[vcmorini]

Hi, I have specific regions in my image which I want to analyse, using simulink.

How can I make a ROI of this?

Have some example which I can see?

Thks!!