Image Based Rendering with Stable Frame Rates by
Image Based Rendering with Stable Frame Rates by Qu, et al. IEEE 2000 Electronic Visualization Laboratory (EVL) presentation by Nicholas Schwarz schwarz@evl. uic. edu Electronic Visualization Lab University of Illinois at Chicago
Introduction • Voxel-based terrain rendering system. • Keyframeless image-based renderer. Uses 3 D warp algorithms and ray-casting. • Offset buffer used to keep track of pixel locations. • Age buffer used to record age of pixels for load balancing. Electronic Visualization Laboratory (EVL) University of Illinois at Chicago
Keyframe Technique • Render keyframe and warp. • Fill in holes by raycasting. • Rerender keyframe when error exceeds threshold. • Warped frame based on original. Electronic Visualization Laboratory (EVL) University of Illinois at Chicago
Keyframeless Technique • Initial render via raycasting. • Offset buffer records exact positions of pixels warped from previous image. • Mc. Millan and Bishop’s 3 D warp algorithm Electronic Visualization Laboratory (EVL) University of Illinois at Chicago
Keyframeless Technique • Each pixel has an age buffer. • Age = 0: ray-cast • Age++ every warp • Age exceeds threshold: rerender • Load balancing by adjusting threshold Electronic Visualization Laboratory (EVL) University of Illinois at Chicago
Keyframeless Technique • Fill in holes by raycasting. • Utilize terrain coherence. Electronic Visualization Laboratory (EVL) University of Illinois at Chicago
Results Electronic Visualization Laboratory (EVL) University of Illinois at Chicago
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