Abstract
We describe a method for converting time-lapse photography captured with outdoor cameras into Factored Time-Lapse Video (FTLV): a video in which time appears to move faster (i.e., lapsing) and where data at each pixel has been factored into shadow, illumination, and reflectance components. The factorization allows a user to easily relight the scene, recover a portion of the scene geometry (normals), and to perform advanced image editing operations. Our method is easy to implement, robust, and provides a compact representation with good reconstruction characteristics. We show results using several publicly available time-lapse sequences.
Highlights
Time-lapse photography, in which frames are captured at a lower rate than that at which they will be played back, dates back to the late 19-th century1
The camera viewpoint is fixed and the scene is mostly stationary, the predominant changes in the sequence are changes in illumination. Under these assumptions we have developed a method that provides a complete decomposition of the original dataset into shadow, illumination, and reflectance components
Each application of Alternating Constrained Least Squares (ACLS) decomposes an m × n data matrix F(t), where m is the number of pixels in the image and n is the number of frames in the time-lapse sequence, into the product of an n × k weight matrix W and a k × m basis matrix H(t)
Summary
Time-lapse photography, in which frames are captured at a lower rate than that at which they will be played back, dates back to the late 19-th century. Classic time-lapse photography subjects are clouds, stars, plants, and flowers. Most timelapse image sequences are collected by the thousands of cameras (webcams) whose images can be accessed using the Internet. They typically provide outdoor views of cities, construction sites, traffic, the weather, or natural phenomena such as volcanoes. Outdoor webcams are used for surveillance to monitor outside activities around companies, ports, or warehouses. -called webcam directories index thousands of live webcams, providing instant online access to time-lapse photos from around the world
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