Instagram Solves A Problem That Goes Back To The Birth Of Photography
Published 8:40 am, Thursday, August 28, 2014
Instagram has solved one of photography's biggest problems with its new app, Hyperlapse.
The app lets people take time-lapse photos while they are moving the camera. Normally, time-lapse photography requires that the camera be held still while it takes images of things that are moving. If the camera is moved, it makes the moving images jump and shudder and still images look blurry.
Camera shake is, arguably, photography's oldest problem. It is virtually impossible for a human to hold a camera completely steady. Old cameras dating to the 1800s were dependent on tripods to keep cameras still enough to take pictures, and photographers still use tripods to eliminate the blurring caused by a wobbly camera. Video-camera operators also tend to favor mounting cameras on wheels or pivots rather than carrying them on their shoulders for precisely this reason.
In Hyperlapse, it doesn't matter if the camera moves, because the tech inside the app knits the images together in such a way as to eliminate camera shake.
The principle behind it is brilliant and simple — even though the algorithm that does the work is doubtless incredibly complicated.
Built into the app is a feature called Cinema, which acts as a gyroscope that continuously crops the external frame around an anchored a central image. The edges of the fixed white frame never cross the warped, shaky frame, meaning when the images are collated together, all of the effects of camera shake are removed:
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Instagram yesterday outlined how this neat algorithm works. The gyroscopic samples and frames are first fed into a stabilizer to generate a new set of camera orientations as an output. Each input frame is changed by the IGTrackStabilizer until it is in the right camera orientation.
Cinema also has an adaptive zoom feature, which picks the zoom of the camera based on how shaky the recorded video is. If there is a small amount of shake, the camera will zoom less — as not much room is needed to counteract the shake. If there is a lot of shake, the camera will zoom in more, as a lot of space will be needed to make sure the shake doesn't mar the picture in the central frame.
The product is smooth video playback, regardless of whether you hold a camera steady.
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