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In this lecture, you will learn how to find images that contain human faces.

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So I have this ripple here.

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The code is from the previous lecture, so this code detects and throws a rectangle around faces in

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one single image.

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What we will do now is we will write a script which will go through this input folder, which contains

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four images.

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This one which don't have faces.

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This one also this image, which contains a face.

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And this one also which contains two faces.

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So two of them contains faces, and our scripts will check this folder.

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And then if it finds images with faces in them, it will draw a rectangle in those images around the

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face, and it will move those images to the output folder, which is empty.

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For now, let's do this since our script is getting bigger now.

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I would like to do some quick changes, such as defining cost and values in our script, which is,

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for example, the Cascades file path.

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And that is faces that example, right?

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That is the hard category that we use, and it's located here in my folder now.

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The path sort of the script will use that as instructions, as a blueprint to find faces and then what

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constants we're going to have else inputs folder, perhaps.

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Eagles to input.

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So this folder and also what puts.

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Folder equals soup output, why I'm writing this in capital letters, you ask.

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Well, that's a good practice.

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That's a convention.

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You don't have to use capital letters, but when you write variables that are constants which are going

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to be used in the scripts.

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So we don't plan to change these views.

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For example, input folder may be used by several instances in our scripts here.

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So that's convention the naming.

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So in face cascades, now we can just see Cascade and let's see what we can change from this code.

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This is finding faces in one single image.

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So we want to find faces, so we want to check if a phase is in an image.

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Therefore, I think we could start with a function such as has phase right, has phase could be a function

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which would receive one single image path, image, file name and return the same image with rectangles

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thrown around the faces in that image.

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So this function will return of the ends and image rights, and it will the return of the image if the

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image has faces inside.

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Otherwise, it will return none.

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So then down here, then ignore these for now.

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Down here, we would do something like images, eagles to always dots list their right.

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So 11 imports imports OS and the folder is Inputs folder.

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So we create a list of images and then we iterate over those image file names, such as for image in

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images.

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And then we create a face image object, which is equal to has face to face and image as the file name

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correct.

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So has face is called in here.

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And as I told you, as face, we will write some codes here, of course.

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But basically this will return the image object.

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And so we grab that image objects in here.

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But sometimes that image object will be just a value, right?

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So if there's no faces, we will return none.

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Therefore, we can check something like if face image is not none.

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The non special object, then we write that image objects into a file.

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Inside output folder.

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Slash.

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Image.

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So images, the file name that therefore we're going to see, right, that image in output slash the

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image name, such as, for example, air air not be written there because it doesn't have faces, but

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garden the jet pack.

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That's the structure more or less.

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Now what's left to do is just implement this function algorithm.

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So now we could just take this code here that we had from the previous video and just paste it inside

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the function.

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Be careful with an indentation from there to there.

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You want to press tab to indent everything, right?

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So this is what we do.

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Has face expects an image file name.

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So let's say image path.

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So air, the jetpack is going to go here.

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Also, galaxy in that jetpack is going to go here.

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So we get that Galaxy J pack and we provide that to, I'm reads.

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So image path, right?

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A color image, correct?

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Face cascades is that.

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That's correct.

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Face is the take to the face is from image from that image object.

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So don't confuse image with this image path.

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That's just the string, which represents the file name.

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This image here is the actual key to open.

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See the object right.

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We get the faces to the mattresses.

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We can print them out just to see them on the terminal.

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And then we iterate in each of those many faces, one face or multiple faces or nothing in that image.

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And so see two rectangle draw a rectangle.

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That's OK.

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You could also get this to just copy it from there and create a variable out of that, such as color.

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So that's a color, right?

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Equal to a vegetable and then in here you see color.

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Four is the width.

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So with equals two for the full replace that with width, color width.

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We could also do the same with that's one point one suit.

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Scale Eagles to 1.1 scale here and four wars minimum neighbors.

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Just neighbors is enough.

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That was for all right now.

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We need to add more codes here to change some details.

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But I do want to just keep adding code.

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I want to run the script now so that you see what is going on and we take things step by step.

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We fix the errors if there are any and so on.

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So I just ran the script.

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Right.

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That's the first error image, empty in function, I am right in line 23, line 23 is this one in here?

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So I'm right, this has no place here because we are writing that in this function.

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Therefore, we want to just delete that and actually, we want to return the image here, right?

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So image?

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This function returns.

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The image object of this gets that image object that is variable, and we check it if it's not none

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and writes it.

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So let's run again.

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OK, we have four empty tables, so the faces here are completely empty.

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Now this is not an error.

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It's just some output and it's sort of an empty output that makes it harder to troubleshoot the issue.

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And therefore you we want to use your logic now.

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There isn't a problem with open civvy.

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That's when you read an image which doesn't exist.

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The item reads Function will just give you an empty array so you can see you can print out image here

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and to run and you're going to see that you get none.

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So it's not a match, but it's not an error, either.

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So that means we're not reading any images here because you see that face image.

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His face is just getting an image file name and this image file name is just.

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That's galaxy the jet pack, but Galaxy the jet pack is inside this folder, so we can fix that by providing

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the full path through an f string.

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So like, that's.

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And another place holder here, a slash between inputs folder slash image.

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That should give us some different altitude now.

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Yeah, yeah, so we got the images printed out as you see the mattresses.

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And then we got stuck somewhere else.

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So I'm right.

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Missing record argument.

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I am sure it's missing the image.

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I'm right here.

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Yeah.

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So we only provided that path.

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Therefore, let's verify the image, which is not image, but the face image.

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So this image here could be a bit more clear.

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We could say image path four image path images.

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So it's explicitly declare that this is an image we know now that this is an image path, not an image

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object image path there and image path here as well.

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So famous image is the object.

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Image path is just a stream.

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Let's run again.

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OK, so we're getting something printed out.

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You see, no God and the JPEG is printed in here and then faces of God and the JPEG are printed afterwards.

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Then if we look up working, the pack also has these faces and also air the jet pack so outs, remove

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this print image here and just print the face is to see faces are printed out.

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So that we don't get all these mattresses.

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So I just run again, and, you know, now it's more compact of the output.

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You see, Galaxy J Pack has these faces, so an empty table working, the jetpack has two faces.

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You remember this two faces.

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And if you see here?

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Yup.

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The face here is detected a swirl of false positive swirl here and here as well.

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But we cannot be hundred percent accurate.

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Galaxy has no detected faces, air neither, so we got this rectangle drone around faces inside these

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two images.

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But our script somehow moved all the files in to output.

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We want only the files with faces to be moved there.

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Why did that happen?

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Well, that's happened because this is what we're doing, right?

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We iterate and we write a rectangle, but then we return the image for everything.

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So we need to do something here to suggest a conditional to distinguish between different phases.

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So an empty table here, an empty table here.

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And this is a list.

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What we could do is we could say something like if Len of faces is different from zero, then we draw

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faces.

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So I indented this so that this happens.

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We draw the rectangles.

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And we intend to return image if that's the case.

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Otherwise, you could see something else return none, but that is not necessarily because by default,

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Python will return none if this is not executed.

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So this block here is only executed when this is evaluated to true, which means when this is different

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from zero different from zero east in the case of this and that.

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So let's give it another try now I'm going to delete.

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These images.

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From output.

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And run.

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All right.

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My terminal is not displaying very well the ultimate yet, no, it's it's here.

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And both my outward folder.

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Has now of these two images.

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So we filter out only the files which have faces in them.

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That's our final code.

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Thanks for following and go to the next video.

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And we do some more coding.