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Hello and welcome to the homework of much of one face recognition.
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So this homework was about building a computer vision application that can detect smells which can be
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very useful today as indeed some businesses consist of building some computer vision tools to understand
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customers reactions when for example they're watching a movie.
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So it is widely used in the cinema industry in the movies industry.
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Some companies indeed use some computer vision tools to recognize customers expressions when they're
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watching a movie to understand what makes them smile what makes them sad.
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What makes them have strong emotions so that they can understand the customers.
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And then for example recommend some new movies which will boost their emotions.
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So today we're going to do exactly that but only with the small part.
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We're going to make a computer vision tool that will detect when a person is smiling.
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And now I get to say congratulations to the people who managed to make this smile detector but also
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I want to congratulate the people who tried to do this homework.
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Trying is also very important by trying always progress.
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We always learn some things even if we don't succeed.
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So what matters is to try hard.
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So on that note we're going to start the solution of this homework and the solution of this homework
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will include everything from the research phase.
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Because indeed when you are a computer vision scientist or even a machineries scientist or an AI engineer
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Well there is always the research phase to look for some solutions.
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So I included this research phase in the Statoil and this research phase consists of finding the hard
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cascade that will help us build this smell detector and then of course we'll proceed to the implementation
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phase and we'll of course use the previous code to be more efficient and then eventually we will watch
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the result in phase 3 we will notice that this is not optimal and therefore in Phase Four we will try
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to improve the code improve the computer vision application to make a much more accurate smell detector.
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So let's do this let's start with Phase 1.
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The research phase.
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So as you can see I'm on Google right now.
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We're going to do our research online to find the right cascade to detect this mouse.
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And so what I'm going to do.
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And actually we'll find a place where you have all the heart cascades in case some of you were wondering
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about that.
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So what I'm going to do I'm going to type here open see the heart cascade it's actually the first here
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open city the cascade.
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Let's do this and let's see what we get.
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OK.
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So we had a couple of links.
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The first one is some open city conditions on the open sea website.
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That's not what we're interested in.
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Then the second one is still in the open with the condition but that's still not what we're interested
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in because that's not where we'll find the heart cascade.
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However on the third link we might have something interesting.
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This third link is actually the good herb repository of open city.
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So if we click on the link What will we find.
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Well we will find all the different Ahar cascades that are allowed to detect features.
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Most of them are phase features not only human face features but also as you can see cat face features.
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This one for example can detect the frontal face of a cat.
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So if you have a cat you can play with it.
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And also it can detect some weird things like as you can see Russian plate number.
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So why not if you're in Russia.
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Well feel free to practice to make a tool to detect Russian plate numbers.
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And what do we see in all these Hargus games.
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We see the heart cascade smiled at X-amount and that's the one we'll use to build our smell detector.
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But you're going to see that it's not that easy.
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We will need to change some parameters in the implementation to make it work better.
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So that's the first step of this homework finding the Harker's get smothered ex-MIL Congratulations
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if you reached that step that's already exent.
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So now how do we extract this Hargus gate if some of you try to make Right-Click and then do something
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like Save Link as well.
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This will not work.
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The best way to extract that Hargus gate is to open it.
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I just clicked on it that should open right now.
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There we go.
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And inside you will find the whole heart cascade ex-MIL for the smell.
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And so what you can do then is copy all this texture and the Epogen way to do this is to scroll down
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all the way down and then press the shift key and then click again to select everything.
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Then you copy and paste it in a text editor and you save your file by giving the following name cascade.
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And of course now that ex-MIL this will work for sure you will make sure I have the right Hargus get
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X amount as smell.
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And so that's exactly what I did.
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I copied that pasted it in a text editor and saved it under this name.
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And so now what we're going to do is open an eye on that because again I really want to make sure you
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don't forget to connect to the virtual platform.
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So there we go.
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Let's do that right now so we don't forget virtual platform that I remind contains all the packages
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pre-install to to all the computer vision models that we will implement in this course and then we're
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going to launch spider and I'm going to show you what I prepared so I prepared actually a folder a homework
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folder and module one that contains this horrid cascade ex-MIL for the smile that we just made.
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And so now let's go to Val Explorer.
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Let's go to the folder that contains your computer vision.
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It is Zed.
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I'm taking this for that though because in module 1 I added a new folder a new subfolder that I called
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homework and that contains this new hard cascade underscores now that SML that I've created this homework
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folder will be provided in the next tutorial which will have the form of an article and you will get
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this homework folder that contains the four files here.
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The first two files you recognize them are X-amount for the eye and the face because we will still be
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detecting the eye and the face but then it contains just new Hargus gate x.
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For the smile and the homework solution that is open right now and inside which we will implement the
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solution.
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All right.
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So if you're ready let's proceed to face to the implementation.
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All right.
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So as I said in the beginning of this oil we're going to do that efficiently and to do that efficiently
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we're going to take our face recognition code that we implemented through all the module one where we
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detected the face and the eye.
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And we're going to simply copy paste the whole code.
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I'm copying it right now and I'm going to close this because we don't we won't need it anymore and I'm
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going to paste this code inside the homework solution.
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So good news.
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Now we simply need to add something that will detect a smile in my face and your faces of course.
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So according to you what do we need to do now.
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Well as you can see in the first code section we load the Cascades.
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So as you might guess we need to load the cascade for the smell and that's exactly what we're going
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to do.
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But before we do that let's not forget to go back to the homework folder because that's the working
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directory folder we need to be in that folder because it contains this Melkus Kate.
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So what I'm going to do now I'm going to copy this line pasted below and replace.
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I cascade by a new object that will represent the small cascade itself.
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And so I'm going to rename it.
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Smile cascade.
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And of course what do I need to do.
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I need to change the input here by the right input and the right input is no longer Hargus good.
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I SML it is hard cascade smal SML.
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Perfect.
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Now we have this Marcus Gade.
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We not only have the SML we also have to smoggiest get great.
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The next step let's move on to the second code section here where we define that function that will
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do the detections.
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And so inside this function we need to add the code that will detect a smell in the face or multiple
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smells if there are multiple faces and draw the rectangles around the smell.
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So there we go.
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Let's do this according to you do we need to do that in the reverential of the face like we did with
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the eyes.
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Well the answer is of course yes because we cannot have a smell if we don't have a face.
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So I'm going to copy the three lines here.
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That corresponds to the detection of the eyes.
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And I'm going to paste that here right.
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So these are the same that correspond to the direction of the eyes.
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And then we're going to make the right replacement to make the detection of this mouse.
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So the first thing that we need to do is replace this object here by smells smells it will contain.
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I remind the coordinates of the upper left corner of the rectangle that will detect this mouse.
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If there are several smells in the videos that is if there are several faces and so this object contains
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the coordinates of the upper left corner of the rectangles detecting this mouse and also the width and
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the height of each of these rectangles.
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OK.
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So smells this is not an object of I cascade.
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But this time smile cascade.
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And from Smout cascade we used to detect multi-skilled method that will apply on the gray region of
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interest which is the region of interest of the face with a skin factor on 1.1 and a minimum number
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of neighbors of three.
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So that's fine.
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Let's keep that for now and we'll see what happens.
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All right then we start this new loop that will iterate through the different eyes but smiles that are
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in the video.
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So I'm replacing ice by Smaltz.
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All right.
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Good but then we will replace the names of these variables here.
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We chose x y z w an H for the eyes.
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Now since we're dealing with a mouse we're going to replace x by a sex e y y s y either will Y S W and
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H by s h.
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That's safer.
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OK.
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And then therefore for each Smout detector we are going to draw the rectangle around this mouse.
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So we do that still in the region of interest.
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This time the colored region of interest because we want to have the original footage with the colors.
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Then of course we need to replace the X and e y by x x and x y and same here X plus E.W. is replaced
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by as 6 plus s w and E.W. PCH we replaced by S-W plus S H.
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Perfect.
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And now let's choose a different color for this mouse.
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So let's see we have 2 5 5 0 0 0 2 5 5 and 0 and so now that shows 0 0 and 2.5 that will give us a different
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color.
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Perfect We will have three different colors to detect the face that will be in blue.
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Then the eyes in green and now the smell will be detected in red.
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Perfect.
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All right so that's it that's actually done for phase 2 we implemented the code to detect a smile.
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So now let's have a look at the results.
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I'm going to execute this code and let's see if it manages to detect correctly some smells.
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So I'm going to select everything here and press command control plus enter to execute.
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There we go.
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Here I am.
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Hello again happy to see you again and congratulations by the way for those of you who reached this
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step with all the red rectangles in your face.
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Don't worry about this.
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This is not our final answer.
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We will improve this.
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Of course we don't have a good smell detector here so we have to do something to improve this indeed.
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So the face is correct correctly detected that either correctly detected but we see some red rectangles
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all around my face.
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That's not good.
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So according to you what do we have to do.
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Well the answer is to choose some different parameters some different parameters in our detect ask methods.
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So that's exactly what we're going to do.
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And in the end we should have only one red rectangle around my ear around my mouth and only when I'm
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smiling of course we're making smell detector.
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So let's do this.
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I'm going to press Q to quit.
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I just quit.
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And now let's proceed to phase four because phase 3 was about watching the result.
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Let's proceed to face forward to improve the code.
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So as I said we have to change the parameters and the detect multitasking method.
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All right.
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So let's look at them one by one.
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The first one is air or gray which is a region where we apply the detection according to you.
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Do we need to change that.
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Well not really.
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We're not going to replace it by Gray because then we will see some red rectangles all around my place.
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You know if I have any shape of object in my place that look like a man will see a red rectangle around
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it.
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That will be that good.
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And believe it or not that will be even worse than what we just got.
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So no we keep our eye Crais because we want to make the detection and the referential of the face for
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the simple reason that a smile is in the face.
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Then second parameter 1.1 during what this is about.
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This is about the scaling factor.
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And in fact we're going to replace it by a new number.
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We're going to choose a larger scaling factor and we're going to increase it to 1.7.
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All right.
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This is not what will help the most improve the solution but still it will help a little but the parameter
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that will definitely make a difference is the number of neighbors we really want to increase the number
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of neighbors because in some way that the direction has to be much more thorough.
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If we have a low number of minimal neighbors well anything that looks approximately like a smell will
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be detected as a smell and that will be not good.
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And that's why we obtained many rectangles in the previous detection.
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So we're going to considerably increase this minimum number of neighbors.
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Now the right number is obtained with experimentation.
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That's another thing very common when doing some computer vision or machine learning or you always have
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to experiment.
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Well this actually goes with research.
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But here we have to replace this number.
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And I'm going to give you the right number now.
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I mean the a number that works very well.
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That will get us a new one rectangle detecting when I'm smiling when you're smiling.
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And this number is 22.
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We increased the number of minimum neighbors from 3 to 22 and that's all we need to do to improve this
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computer vision solution.
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And now let's look at the results.
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I'm going to execute that again.
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There we go.
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Executed.
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Now let's see.
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All right.
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So hello again.
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Well now as you can see I'm not smelling I'm neutral and nothing happens.
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What does happen when I smile.
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There we go.
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We can see a red rectangle detecting detecting when I'm smelling.
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I'm sorry for the non natural smell but I'm trying to make this work all right here it works very well.
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We can we can try to still improve this.
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So I'm going to press Q And I'm even going to increase the minimum number of neighbors of the eyes and
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I'm also going to remove my mike because I think it's interfering with the detection.
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So let's see.
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I'm going to increase the minimum number of neighbors of the eyes to also 22 and we'll see what happens.
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So there we go.
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Now we have for the eye a scaling factor of 1.1 and 22 minimum neighbors.
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And for this now we have a scaling factor of 1.7 and 22 minimum neighbors.
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Now I'm going to put my mike a little bit away from me but not the force that you can still hear me.
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I'm going to say like that again.
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Execute.
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And now let's see what happens.
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And here are the results.
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OK.
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So first of all we see that the eye detection works much better.
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I'm trying not to smile so we can indeed see two red red to green rectangles around the eyes and not
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any around my nose as we could observe before.
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And right now I'm having a neutral smell and not smelling.
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And what does happen when I smell
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we see the red rectangle.
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Cool.
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And now what has happened when I don't smile.
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Know smile it's not
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smile no smile now no smile.
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Ok it seems to be working very well.
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I work much better than before.
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I'm glad we proved this and the smile is really working well.
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Not only we see only one rectangle when I'm smiling but also it only appears when I smell.
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All right perfect so that's done for the homework.
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Congratulations if you reached that phase.
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That is if you manage to make this mounded takes you by changing the parameters to make it work.
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That was not an easy homework we had several things to do several phases to go through.
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But if you managed to get this no phase detector detector and smell detector well really congratulations.
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And again for those of you who didn't obtain this but still try it and spend some time trying to get
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a good smell detector.
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Well congratulations to you to be relieved.
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That also made you progress definitely.
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So now it's actually the end of Mudgal one face recognition.
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I was very happy to do this for us Mudgal with you.
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Now we're going to take things at the next level with object detection.
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We're going to build a state of the art computer vision more all that beats any other model for object
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detection.
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It's as is the model single shot multi-book detection.
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So I look forward to starting Munjal too with you.
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And until then enjoy computer vision.
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