Abstract
Large meshes or images cannot be rendered at full resolution on mobile devices such as cell phones, PDAs and laptops since these devices have limited storage, CPU, memory, display, and battery power. Wavelet-based multiresolution analysis can represent meshes and graphics input at multiple Levels of Detail (LODs). We propose UbiWave, a wavelet-based framework for scalable transmission of large meshes and graphics content to heterogeneous ubiquitous computing devices. In UbiWave, a base representation and different levels of wavelet coefficients are pre-generated at the server. An optimal LOD level is transmitted to each mobile client based on its spacification and wireless channel conditions, where the corresponding LOD is reconstructed. To save scarce resources on mobile devices, we render graphics content at the lowest LOD that does not show visual artifacts, called the point of indiscernability (PoI). By rendering content at the PoI instead of the highest resolution, we are able save 61% decode time and 45% energy usage on the client
Highlights
Advances in ubiquitous displays and wireless communications has fueled the emergence of exciting mobile graphics applications including 3D virtual product catalogs, 3D repair manuals, security monitoring systems, 3D maps, telesurgery and mobile games
Current trends in using cameras to capture geometry, material reflectance and other graphics elements means that very high resolution inputs is accessible to render extremely photorealistic scenes
While our complete server decision heuristic is based on multiple factors, we currently use the Point of Indiscernability (PoI) metric described above, which tries to select the lowest acceptable LOD for any given mobile device based on its screen size
Summary
Advances in ubiquitous displays and wireless communications has fueled the emergence of exciting mobile graphics applications including 3D virtual product catalogs, 3D repair manuals, security monitoring systems, 3D maps, telesurgery and mobile games. We propose UbiWave, an end-to-end framework for scalable rendering of graphics content on heterogeneous ubiquitous computing devices. We can render graphics content at scales suitable for tiny devices as small as cell phones and headmounted displays, or as large as large tiled displays. In UbiWave, our philosophy is to save scarce resources by rendering at the lowest resolution that does not show visual artifacts, called the Point of Indiscernability (PoI).
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