from quality to flash from causing people to top this is where they are. welcome to 77 percent. this weekend on the w. . can you spot the fake deep fakes videos faked by a hired seem deceptively real and they're a serious threat to society in order to expose the fakes 2 experts are embroiled in their battle in the name of science while one of them fakes the other masks we met up with both of them to fix our topic today i'm sure. there. are. some defects are funny others are really mean it's fascinating how researchers can

manipulate videos with the help of artificial intelligence i tried out what it was like to control someone else's face. check me out as far as your hands and. personally. or by doing it put in. it's pretty impressive to see how easy that was with the right technology and in real time to i don't even want to imagine what could happen if a fake president declared war how can we stop fake news or deep fakes that's what scientists are asking themselves to we met the 2 most renowned the fake experts in the us their academic competition is advancing research on the issue. those who consider how to lead to be the best the fake artist in the world the german computer scientist teaches at the university of southern california and manipulates videos for science you know as hard as it sells. we're also trying to advance it in

order to be able to detect them right because if you don't understand how they are being generated if you don't have the capability of generating realistic effects there is no way to effectively detect those either his opponent honey fareed uncovers steve thanks a professor at the university of california berkeley he's a world leading expert in digital forensics. i think the biggest obstacle in detection is that the field is moving so quickly every 3 months you see new advances in the creation of fake content so our adversary if i can call them that is not static they are changing and they're changing really fast so we start developing these new friends of technology and all the sudden there's a whole new way of creating deep fakes and now we have to worry about that as well it's crazy to see how quickly this technology is advancing we're used to it from photos technically we're all able to alter them at home with basic software that

videos a few years ago moving images where prove that something had really happened did fakes have taken this to another level there's growing fear that from information circulating without anyone noticing especially when it comes to big events like the us presidential elections whether it's photos or videos isn't new but it's getting better as health experts warn we've always had fake news from the day of the printing press being developed but here's the difference we this what's new here is not we can create fake news we can create fake images we can create free videos what's new here is the sophistication with which we can do it the democratization of access so almost anybody on the internet can do it but here's the real issue instant global publication the most scary thing is that it feels like you're stealing someone's identity and you can put anything you want. to their mouth you

can make them do whatever you want so far defect technology is used mainly for one purpose porn one study shows that this amounts to 96 percent of the defects online today stars like emma watson and scarlett johansson were some of the 1st prominent victims their faces were super imposed on to pornographic videos with the help of ai the program enabling such fakes was 1st uploaded to the online forum reddit the anonymous user called deep fakes was quickly banned but other users took over his software code and kept expanding it today similar software is still freely available online the name is a combination of deep as and deep learning technology and fake but how exactly do defects work how hard is it to make them look real the effect expert howley explained it to me in los angeles. many deep fakes are based on so-called guns out rhythms that are on supervised meaning they learn without human guidance instead

they're trained with raw data real photos for example. you're not modeling anything you just collecting a bunch of pieces all you need just to make sure they're lined like those and you crop the fees right and you're manually you would try to make sure that there's a bunch of different any condition different expressions and it just learns it by itself this is what is so powerful about the steep learning based approaches. the novelty in this approach is starting to algorithms work together one generates on the u. of the checks almost like how liam honey fareed. is like an arms race right you have to generated a tries to generate some images in the beginning you know it's just like some random pixels but then what you try to do is you tell instead of telling it where to improve like traditional supervised learning you just tell it no it's not good enough so you improve improve again until the. you would fall the discriminator so

discriminator can't sell anymore what a difference is that in itself some proves the algorithms work in their own without human assistance. so that the why this one minute long video took 4 days to make it's a deep fake generated by how lee and his team. to create it they use face what technology and videos of comedians imitating us politicians. go to the biggest for this the fake algorithms were fed 5000 images but there's no secret recipe for the perfect deep fake yet sometimes we don't know why we add more data and the it gets worse so there's a little bit of. black magic and you know cooking over there we've all got photos on social media right i think it's pretty scary to think that somebody could use my pictures to make a fake video of me that's why methods to flack the fakes quickly and reliably are

becoming more and more important tech giants like facebook and microsoft have launched the deep fake detection challenge with a prize of nearly 1000000 euros here at the w. we've developed a very few cation program through the media which can help analyze there's just a content there's also a number of specialized startups on the issue how different is an expert in digital forensics he uses how these defects to find his erf occasional programs and he's always on the lookout for the best way to use ai but a i approach is exactly what you think it is you get a bunch of real videos you get a bunch of fake videos and you teach them in machine learning system to tell the difference but that's a sensitive subject since d. cakes are also created with machine learning a detection toll could just as well be used to generate better fakes but i need to read goes beyond the ordinary approach instead of just relying on ai he and his team analyze videos to identify people's unique facial features we try to

understand how do people move how does the mouth move how does the expressions change in part because we think that those are properties of the video that the machine learning can't currently analyze and that means we are less vulnerable to counterattack so any time you build forensic techniques you always have to ask yourself how will this be used to make better fakes this is grid visualizes aspects such as head movement line of vision and facial expressions in order to spot differences honey for reed compares a real video with a video that was possibly altered this method detects about 96 percent of faked footage. one possible use for this might be to integrate detection software into social networks algorithms in the future google has already provided scientists with some 3000 manipulated videos to help improve the detectors.

to make these $3000.00 videos google employed 20 at actors and then manipulated the images with algorithms so tech giants seem to be taking deep thanks faeries seriously and it's no surprise experts predict the damage caused by manipulated audio and video files could range as high as nearly a quarter 1000000000 euros and 2020 and what's worse there's no perfect program to help us detect deep fakes yet but every new technology has a good side to right the fakes also offer f.-u. exciting possibilities for the future a magic you can have a customized movie where when you download a movie you can say i want this actor or this actress to be in the movie instead of who it is. this is a huge opportunity for the movie industry soon visual effects could be much cheaper to produce but so far deep technology cannot create images in the same high resolution as movies. but it's good enough for you tube videos. which is so nicolas

cage becomes the godfather. take technology could also bring celebrities back to life like the spanish painter salvador dali. museum in florida visitors can even pose for a picture with him. i think one of the most interesting ones is in hollywood studios for creating movies so if we have a movie that is filmed in german and we want to listen to it in english you create a lip sync deep fake where the person now it looks like they're speaking english that's super cool like this awareness campaign and not in languages leiria isn't just any disease. everything so he said. that about us you know gags he says you know do you know what is being. done to the discipline to do the right thing to make it the creator's animated 3 d. model of david beckham's face wow that's cool someone you might be able to watch me

host shift in hindi or kiswahili completely in sync and perhaps even life it's just a matter of time before we're able to manipulate 4 k. videos in real time it's just up to computers getting a little bit faster but back to more serious matters people around the world need to know about this new technology how leap presented his face what studio at the world economic forum in davos the most important thing is actually that people know that this is possible right if they wouldn't know that they could easily be fooled if they know that there are ways to actually create the to manipulation is extremely believable then you know we will have some way of protection but honestly i have to say that both experts hunted for it and how we have managed to call my worries about the fake a little fake news has always been

a huge problem not just today but the perfect technology it's not even necessary for it. the more people are aware of the fakes and the possibilities to manipulate the views the better they can deal with misinformation is something true or false that's not a question of deep fakes what do you think are you scared off manipulated views or is this all just a storm in a teacup let us know what you think you can do this on you tube too there you can find a video of me getting my very own 3 d. avatar and how nice laugh in los angeles i even said in the same chair as will smith the hardest part was i had to make 26 different faces take it out on our you tube channel thanks for watching and see you next time.

doesn't use crime fighters are back to the africa's most successful radio drama series continues in the only besos are available online and of course you can share and discuss on w. africa's facebook page and other social media platforms crime fighters to me and now. they were forced into a nameless mass with. their bodies near tools of. the history of the slave trade is of africa's history. to describe something for power and profit plummeted an entire continent into chaos and the violence of the slaves system created the greatest player accumulation of wealth the world had ever seen up to that moment in time this is the journey back into the history of slavery

. i think it will truly be making progress. and we all accept the history of slavery as all of our history. our documentary series slavery routs starts march 9th on d w. thomas clem is a social worker who works with refugees in frankfurt odor. for a while the city which is not far from berlin was considered a successful example of integration. but then a group of refugees attacked the frosch nightclub. they only got to this point we didn't let them get in but they kept smashing the windows. since the frost

incident it has gotten tougher definitely if you're. helping refugees as more than a job for thomas clan he has become friends with many of them considering them almost like family don't thomas is a good man he's very kind and very. kind is there at the refugees need help understanding german bureaucracy language or culture. canvassed him do they don't know certain rules they don't know certain cultural mechanisms but you can't just say seems alabaman poof you know you know what some sign up in means please dear god knows some sort of game is what you say to get magic to happen.