How to make 2D boundary follow the data ?

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I have this data set (attached). I tried to find the boundary for it but the boundary doesn't follow outer data points exactly (as shown) especially at the corners. Though I tried to change shrink factor(s). Hope you can help me figure that out.
Thank you
x=Data(:,1);
y=Data(:,2);
s=1; %shrink factor
k = boundary(x,y,1);
Xbound=x(k);
Ybound=y(k);
plot(Xbound,Ybound);

Accepted Answer

Image Analyst
Image Analyst on 8 Sep 2017
Try different shrink factors, the third argument. Try something between 0.1 and 0.9 until you find one that "hugs" your point set the best.
  1 Comment
Faez Alkadi
Faez Alkadi on 8 Sep 2017
Hi,
I did that before, but still doesn't work. Hope you try it with the data i have attached and see. Thank you

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