A very cool article, indeed; but I believe he uses the term exposure wrong.<p>Exposure is the total time our whole light sensitive area is exposed to the light coming from our scene. You can think of it as an integral of the sensor (or film) area exposed as a function of the time, divided by the total sensor area.<p>In the examples he uses the term exposure to describe the total scantime of the sensor, whilst it seems that his actual exposure (which is equal to the time each row of pixels samples the scene) is much smaller.<p>It may sound as a small difference but if one wants to reproduce the effect, we will essentially need to match two parameters: exposure and scantime. While exposure is easy to set, scantime is pretty much hardcoded and depends on the physical characteristics of the camera. Even an analog shutter has a scantime on small exposure times.