function dec = dec_reg(dbtype,dist,x,y,dbp,nbr);

% function dec = dec_reg(dbtype,dist,x,y,dbp,nbr);

[leny,lenx,nd] = size(dist);

if strcmp(dbtype,'maxpost')
    
    dist_c = zeros(leny,lenx,nd,nbr);

    ur_prev = 10; % underrun preventive measure
    
    for ir = 1:nbr
        for id = 1:nd
            dist_c(:,:,id,ir) = ur_prev*dbp(ir,id)*dist(:,:,id);
        end
    end
    
    % hacky - depends on exactly four distributions (6/17/08)
    for ir = 1:nbr
        for id = 1:nd
        dec(:,:,id,ir) = dist_c(:,:,id,ir) >= dist_c(:,:,1,ir) & dist_c(:,:,id,ir) >= dist_c(:,:,2,ir) & ...
            dist_c(:,:,id,ir) >= dist_c(:,:,3,ir) & dist_c(:,:,id,ir) >= dist_c(:,:,4,ir);
        end
    end

else % if strcmp(dbtype,'maxpost')
    
    % created bound_spec function on 6/17/08
    [dbx,dby] = bound_spec(dbp,x,y,dbtype,nbr);

    lenx = length(x);
    leny = length(y);

    if nbr == 5
        bidx = [1 2; 2 1; 2 2; 2 3; 3 2];
    elseif nbr == 1
        bidx = [1 1];
    end
    
    % assumes 5 base rate conditions
    for id = 1:nbr
        for iy = leny:-1:1
            for ix = 1:lenx
                
                dec(iy,ix,1,id) = ( y(iy) - dbx(bidx(id,1),ix) ) < 0 & ( x(ix) - dby(bidx(id,2),iy) ) < 0;
                dec(iy,ix,2,id) = ( y(iy) - dbx(bidx(id,1),ix) ) >= 0 & ( x(ix) - dby(bidx(id,2),iy) ) < 0;
                dec(iy,ix,3,id) = ( y(iy) - dbx(bidx(id,1),ix) ) < 0 & ( x(ix) - dby(bidx(id,2),iy) ) >= 0;
                dec(iy,ix,4,id) = ( y(iy) - dbx(bidx(id,1),ix) ) >= 0 & ( x(ix) - dby(bidx(id,2),iy) ) >= 0;

            end
        end
    end
end