How to make 2D boundary follow the data ?

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);

Answer 1

[Image Analyst]

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.

[Faez Alkadi]

Hi,

I did that before, but still doesn't work. Hope you try it with the data i have attached and see. Thank you