clc
clf
im=vfm('grab',1);

linha=rgb2gray(im(80,:,:));
im2=imadjust(linha,[0.2 1],[]);
im3=im2bw(im2);


subplot(4,1,1)

imshow(im)

subplot(4,1,2)

imshow(linha)

subplot(4,1,3)

imshow(im2)

subplot(4,1,4)

imshow(im3)



