Algorithm 1 conv-SPP
1:	Set W = 1;
2:	Solve Equation (6);
3:	Update W as in Equation (7) and ϵ as in Equation (8);
4:	Go back to step 2, if none of the stopping criteria is true;
5:	Discard zero elements of C;
6:	Solve Equation (5) with updated C;