pico.js, a face-detection library in 200 lines of JavaScript The pico.js JavaScript library enables the detection of faces in images. Highlights of the library: open-source code: https://github.com/nenadmarkus/picojs; has real-time detection capabilities (200+ FPS in a practical setting): see webcam demo; just 2kB when minified. Introduction We introduce pico.js, a face-detection library written i