Help in creating voronoi diagram with offset cells

After creating voronoi cells are generated from the random seed points in a plane.... Each cell is offset to leave a desired amount of space around them and named it as a seperate region..

I have got the following code from the matlab..

x = gallery('uniformdata',[1 10],0);

y = gallery('uniformdata',[1 10],1);

voronoi(x,y)

how to create an offset to each cell?