Via DesignBoom:  An interesting piece on how Jonathan Hooker “hacked” a prototype system that uses LEDs timed in precise sequences with a video camera to create a system where the facial lighting on a person in a still image or a video can be dynamically “relit” as desired.

According to the article:

initially started as a personal project conceptualized as a way to re-light still images, jonathan hooker founder of oblio, designed a rig that is based on ‘normal map’ 3D technology that can shine light in any direction after the photograph has been taken. the platform uses color to show which direction any pixel in the image is facing, together with complex 3D algorithms it can use that information to add illuminates post production.

And here is the DesignBoom interview with Jonathan: