Our goal was to create an API for connecting different mobile devices of all types to one big screen without huge afford for the users. Our product is web-based, which means you don not have to install any software on your device to use it. Therefore we used Websockets, so you just have to type in the server’s IP and can connect. Via our server’s webcam we take pictures of the different devices that should be connected. At this point some image processing was required. In order to separate the background from the foreground, we grayscaled our picture and programmed some kind of the Otsu algorithm to get the optimal gray-scale value. All pixels that are darker, are drawn black,[…]