img_bw=img_gray;
treshold_level=70;
for i=1:info.Height
    for j=1:info.Width
    if(img_gray(i,j)>treshold_level>treshold_level)
        img_bw(i,j)=255;
    else
        img_bw(i,j)=0;
    end
    end
end

figure
imshow(img_bw);