What code can I use if I want to add a condition wherein if I show a picture

What code can I use if I want to add a condition wherein if I show a picture that is not registered in the database folder it will display ‘Unrecognized Face”? ????

In the code shown below, when I show my face in the webcam, it will display my name since my face is already registered in the database. I tried to show another picture that is not registered in the database, but the result still display the name that is registered in the database like my name. My only concern is how can I display “Unrecognized Face” if I show a picture that is not registered in the database? Thank you ????

clc;
close;
clear 
c=webcam; 
load myNet1; 
faceDetector = vision.CascadeObjectDetector; 
while true
     e = c.snapshot;
     bboxes = step(faceDetector,e);
     if(sum(sum(bboxes))~=0)
        es=imcrop(e,bboxes(1,:));
        es=imresize(es,[227 227]);
        label=classify(myNet1,es);
        image(e);     
        title(char(label));
        drawnow;
     else
         image(e);
         title('No Face Detected');
     end
 end

ANSWER

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You need a function that checks the current snapshot against your database. That function can return true, false, or even the name of the person it thinks it is (or null if it doesn’t recognize it). For example

rgbImage = c.snapshot;
personsName = YourDatabaseCheckingFunction(rgbImage);
if isempty(personsName)
    % Did not recognize anyone that was in the database.
    title('This person is not recognized.', 'FontSize', 18)
    % Pop up a message if you'd like...

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