Make black and white pixel image of a grid

I have this function which generates a 12x12 maze with lines as borders of the maze. I need to convert it into a monochromatic image of 25x25 with each black pixel being boundary and each white pixel being the available path.

As maze is generated randomly, I need to update the monochromatic image maze with the original maze.

Actual maze (randomly generated from code) is attached.

Kindly help me out in this regard.

function show_maze(row, col, rr, cc, ptr_left, ptr_up, ptr_right, ptr_down,h)

figure(h)

line([.5,col+.5],[.5,.5]) % draw top border

line([.5,col+.5],[row+.5,row+.5]) % draw bottom border

line([.5,.5],[1.5,row+.5]) % draw left border

line([col+.5,col+.5],[.5,row-.5])  % draw right border

for ii=1:length(ptr_right)

      if ptr_right(ii)>0 % right passage blocked

          line([cc(ii)+.5,cc(ii)+.5],[rr(ii)-.5,rr(ii)+.5]);

          hold on

      end

      if ptr_down(ii)>0 % down passage blocked

          line([cc(ii)-.5,cc(ii)+.5],[rr(ii)+.5,rr(ii)+.5]);

          hold on

      end

end

axis equal

axis([.5,col+.5,.5,row+.5])

axis off

set(gca,'YDir','reverse')

return

Answer 1

[Walter Roberson]

If you have the Computer Vision toolbox, then: https://www.mathworks.com/help/vision/ref/insertshape.html