Abstract
This paper presents a novel algorithm for synthesizing and editing video of natural phenomena that exhibit continuous flow patterns. The algorithm analyzes the motion of textured particles in the input video along user-specified flow lines, and synthesizes seamless video of arbitrary length by enforcing temporal continuity along a second set of user-specified flow lines. The algorithm is simple to implement and use. We used this technique to edit video of water-falls, rivers, flames, and smoke.
Highlights
Real footage of natural phenomena has a complexity and beauty that is rarely matched in synthetic footage in spite of many recent advances in simulation, rendering, and post-processing
We edit the water flow lines to curve around the trunk and use the foamy texture to create the effect of water colliding against the trunk
Most of the editing examples took a few iterations of interaction to achieve the desired result
Summary
Real footage of natural phenomena has a complexity and beauty that is rarely matched in synthetic footage in spite of many recent advances in simulation, rendering, and post-processing. Leveraging real footage for special effects is difficult, because a natural scene may not match the director’s intentions and modifying the physical setting may be expensive or impossible. We present a technique that allows the user to modify real footage while maintaining its natural appearance and complexity. To generate video of arbitrary length, we synthesize particles such that they complete their full paths along each flow line. Playing back these particles along new flow lines allows us to make interesting edits to the original video (Figure 1). The user defines flow lines on both the input and output video and we leverage his or her visual intuition to create a wide range of edits. We demonstrate the power of this approach by modifying scenes of waterfalls, a river, flames, and smoke
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