Explore the fascinating world of computer vision through JavaScript in this JSConf Iceland 2016 talk by Mariko Kosaka. Delve into the intricacies of how computers perceive images and learn to build your own Augmented Reality (AR) application using vanilla JavaScript. Begin by extracting image data from canvas objects and manipulating it to alter image appearances. Gain insights into how browsers interpret image data as arrays of numbers. Progress through simple image analysis processes, including corner convolution and circular shape factor calculations. Discover techniques for image filtering, processing, and isolation. Understand the parallels between human eyes and computer vision, and learn how to leverage Web Workers for improved performance. By the end of this talk, you'll have the knowledge to create your own AR app and demystify the seemingly magical world of computer vision.