 Hey there fellow scholars, I am Karoi Zonaifahir and this is two-minute papers where we learn that research is not only for experts, it is for everyone. Is everything going fine? I hope you are all doing well and you are having a wonderful time. In this episode we are going to look at time lapse videos. Let's say we would like to build a beautiful time lapse of an Norwegian glacier. The solution sounds quite simple. Let's find hundreds of photos from the internet and build a time lapse video from them. If we just cut a video from them where we put them one after each other we will see a disturbing flickering effect. Why? Because the images were taken at a different time of the day so the illumination of the landscape is looking very different on all of them. They are also taken at a different time of the year and from different viewpoints. Moreover since these images are taken by cameras, different regions of the image may be in focus and out of focus. The algorithm therefore would have to somehow equalize all of the differences between these images and bring them to a common denominator. This process we call regularization and it is a really difficult problem. On the left you can see the flickering effect from the output of a previous algorithm that was already pretty good at regularization but it still has quite a bit of flickering. Here on the right you see the most recent results from the University of Washington and Google compared to this previous one. The new algorithm is also able to show us these beautiful, rhythmical seasonal changes in Lombard Street, some Francisco. It can also show us how sculptures change over the years and I feel that this example really shows the possibilities of the algorithm. We can observe effects around us that we would normally not notice in our everyday life simply because of the reason that they happen too slowly. And now here's the final time lapse for the glacier that we were looking for. So building high quality time lapse videos from an arbitrary set of photographs is unbelievably difficult and these guys have just nailed it. I'm loving this piece of work. And what do you think? Did you also like the results? Let me know in the comment section. Thanks for now, thanks for watching and I'll see you next time.