u0 = imread('good1_4.bmp');
u0 = double(u0);
imagesc(u0); colormap(gray);
%u0_color = imread('sample.jpg');
%u0_color = double(u0_color);
%u0(:,:) = u0_color(:,:,1);
phi = ActiveContours_const(u0, 0.1 * 255 * 255,1, 1,200);