Hacklet 86 – Time-lapse Projects

“If I could save time in a bottle…” it’s not just an old song, it’s a passion for many photography hackers. Time-lapse photography is a way to show the movement of time through still images. These images are animated into what essentially is a video recorded at a super low frame rate. We’re talking one frame per minute or slower in some cases! The camera doesn’t have to be still for all this, but any motion must be carefully controlled. This has led hackers, makers, and engineers to create a myriad of time-lapse rigs. This week’s Hacklet is all about some of the best time lapse projects on Hackaday.io!

rig-1We start with [Swisswilson] and the simply named Timelapse rig. To say this rig is beefy would be an understatement. All the aluminum parts, with the exception of the gears, were machined by [Swisswilson]. Two Nema-23 Nema-17 motors are controlled by Sparkfun Easy Stepper Drive boards, while an Arduino Micro serves as the controller. The electronics are all housed in a sturdy box which also serves as a remote control. A joystick allows pan and tilt to be manually controlled. The bombproof construction is definitely a help here, as [Swisswilson] is using this rig with DSLR cameras. Combined with a lens, these setups can reach a pound or two.


pilapseNext up is [minWi], who put their script-foo to work with raspilapse. Raspilapse automates the entire process of taking photos, assembling them into a movie, and uploading to YouTube. The hardware is a Raspberry Pi Model B, with a RasPi Camera. The Pi shoots images then uploads them to a Virtual Private Server (VPS). [minWi] used an external server to save wear and tear on the Pi’s SD storage card. At the end of the day, the VPS uses ffmpeg to assemble the images into a video, then uploads the whole thing to YouTube. We’re betting that with a few script mods, this entire process could be run on a Raspberry Pi 2. If you’re really worried about the SD card, a USB flash drive could be used.


SunriseSunsetRig[Andyhull] takes us down to one frame per day with Sunset and Sunrise camera controller. [Andy] wanted to get shots of the sunrise every day. Once converted to a video, these shots are great for documenting the passing of the seasons. He used a Canon point and shoot camera along with the Canon Hack Devleoper’s Kit (CHDK) for his camera. The camera has its own real-time clock, and with CHDK, it can be programmed to shoot images at sunrise. The problem is power. Leaving the camera on all the time would quickly drain the batteries. Arduino to the rescue! [Andy] programmed an Arduino Pro Mini to turn the camera on just before sunrise, then shut it back down. The standby power of a sleeping ATmega328 is much lower than the camera’s, leading to battery life measured in weeks.


podFinally, we have [caramellcube] who added data to their time-lapse photos with Portable Observation Device (POD). POD was conceived as a device to aid paranormal investigators. The idea was to have a device that could take images and record data at a set interval from within a locked room. Sounds like a job for a Raspberry Pi! [caramellcube] started with Adafruit’s Raspberry Pi-based touchscreen camera kit. From there they added a second board controlled by an Arduino Nano. The Nano reads just about every sensor [caramellcube] could fit, including humidity, air pressure, magnetic field strength, acceleration, light (4 bands), sound, and static charge. The Nano allows [caramellcube] to connect all those sensors with a single USB port on the Pi. We’re not sure if [caramellcube] has found any ghosts, but we’re sure our readers can think of plenty of uses for a device like this!

If you want to see more time-lapse projects, check out our new time-lapse projects list! If I missed your project, don’t be shy, just drop me a message on Hackaday.io. That’s it for this week’s Hacklet. As always, see you next week. Same hack time, same hack channel, bringing you the best of Hackaday.io!

Hyperlapse Makes Your HeadCam Videos Awesome

hyperlapse First person video – between Google Glass, GoPro, and other sports cameras, it seems like everyone has a camera on their head these days. If you’re a surfer or skydiver, that might make for some awesome footage. For the rest of us though, it means hours of boring video. The obvious way to fix this is time-lapse. Typically time-lapse throws frames away. Taking 1 of every 10 frames results in a 10x speed increase. Unfortunately, speeding up a head mounted camera often leads to a video so bouncy it can’t be watched without an air sickness bag handy. [Johannes Kopf], [Michael Cohen], and [Richard Szeliski] at Microsoft Research have come up with a novel solution to this problem with Hyperlapse.

Hyperlapse photography is not a new term. Typically, hyperlapse films require careful planning, camera rigs, and labor-intensive post-production to achieve a usable video. [Johannes] and team have thrown computer vision and graphics algorithms at the problem. The results are nothing short of amazing.

The full details are available in the team’s report (35MB PDF warning). To obtain usable data, the fisheye lenses often used on these cameras must be calibrated. The team accomplished that with the OCamCalib toolbox. Imported video is broken down frame by frame. Using structure from motion algorithms, hyperlapse creates a 3D models of the various scenes in the video. With the scenes in this virtual world, the camera can be moved and aimed at will. The team’s algorithms then pick a smooth path that follows the original cameras trajectory. Once the camera’s position is known, it’s simply a matter of rendering the final video.

The results aren’t perfect. The mountain climbing scenes show some artifacts caused by the camera frame rate and exposure changing due to the varied lighting conditions. People appear and disappear in the bicycling portion of the video.

One thing the team doesn’t mention is how long the process takes. We’re sure this kind of rendering must require some serious time and processing power. Still, the output video is stunning.

Continue reading “Hyperlapse Makes Your HeadCam Videos Awesome”