v1 fmd with basic working code

clc
clear all;
close all;
cam=webcam(1);
while true
    e=cam.snapshot;
    FDetect=vision.CascadeObjectDetector('Mouth','MergeThreshold',100);
    I=e;
    BB_Mouth=step(FDetect,I);
    imshow(I);
    hold on;
    %%
    FDetect=vision.CascadeObjectDetector('Nose','MergeThreshold',16);
    I=e;
    BB_Nose=step(FDetect,I);
    imshow(I);
    hold on;
    if(sum(sum(BB_Nose))==0 && sum(sum(BB_Mouth))==0)
    FDetect=vision.CascadeObjectDetector('FrontalFaceLBP','MergeThreshold',10);
    BB_Mouth=step(FDetect,I);
    if(sum(sum(BB_Mouth))~=0)
    title('Remove Hand Please');
    else
    title('Mask Present');
    end
    elseif((sum(sum(BB_Nose))~=0 && sum(sum(BB_Mouth))==0)||(sum(sum(BB_Nose))==0 && sum(sum(BB_Mouth))~=0))
   for i=1:size(BB_Nose,1)
   rectangle('Position',BB_Nose(i,:),'Linewidth',5,'LineStyle','-','EdgeColor','r');
   end
   for i=1:size(BB_Mouth,1)
   rectangle('Position',BB_Mouth(i,:),'Linewidth',5,'LineStyle','-','EdgeColor','r');
   end
    title('Please wear mask properly');
    else
   for i=1:size(BB_Nose,1)
   rectangle('Position',BB_Nose(i,:),'Linewidth',5,'LineStyle','-','EdgeColor','r');
   end
   for i=1:size(BB_Mouth,1)
    rectangle('Position',BB_Mouth(i,:),'Linewidth',5,'LineStyle','-','EdgeColor','r');
    end
    title('Please wear Mask');
    defaultString = 'Please wear Mask.';
    end
    pause(5)
end