A Hybrid Rendering Technique to Navigate in Large Terrains Using Mobile Devices

We describe a hybrid client-server technique for remote adaptive streaming and rendering of large terrains in resource-limited mobile devices. The technique has been designed to achieve an interactive rendering performance on a mobile device connected to a low-bandwidth wireless network. The rendering workload is split between the client and the server. The terrain area close to the viewer is rendered in real-time by the client. The terrain located far from the viewer is portrayed as view-dependent impostors, rendered by the server on demand. A prototype has been built and an exhaustive set of experiments covering several platforms, wireless networks and a wide range of viewer velocities has been conducted. Results show that the approach is feasible, effective and robust.Postprint (published version

SISTEMA DE VISUALIZACIÓN REMOTA PARA LA REPRESENTACIÓN INTERACTIVA DE VOLÚMENES DE DATOS MÉDICOS

Las aplicaciones de visualización médica han adquirido un elevado auge en la medicina a nivel mundial, ya que les permite a los médicos especialistas realizar diagnósticos preoperatorios no invasivos y de alta precisión desde una perspectiva 3D. La idea principal de la misma es obtener un modelo tridimensional de alta resolución gráfica a partir de imágenes médicas digitales de las modalidades de Tomografía Axial Computarizada y Resonancia Magnética Nuclear. Los usuarios de este tipo de aplicaciones demandan de forma creciente que las aplicaciones permitan el diagnóstico de patologías en un entorno de trabajo colaborativo. En este trabajo presentamos una arquitectura para sistemas de visualización remota basados en la transmisión de imágenes. El esquema de comunicación y transmisión de datos e imágenes entre el servidor y los clientes utiliza RTP como protocolo de comunicación. Los resultados obtenidos demuestran que la variante de algoritmo RLE implementada permite obtener visualizaciones interactivas y en tiempo real con un consumo mínimo del ancho de banda de la red.PALABRAS CLAVE:Visualización remota, visualización médica, arquitectura cliente-servidor, visualización tridimensional

A Hybrid client-server based technique for navigation in large terrains using mobile devices

We describe a hybrid client-server technique for remote adaptive streaming and rendering of large terrains in resource-limited mobile devices. The technique has been designed to achieve an interactive rendering performance on a mobile device connected to a low-bandwidth wireless network. The rendering workload is split between the client and the server. The terrain area close to the viewer is rendered in real-time by the client using a hierarchical multiresolution scheme. The terrain located far from the viewer is portrayed as view-dependent impostors, rendered by the server on demand and, then sent to the client. The hybrid technique provides tools to dynamically balance the rendering workload according to the resources available at the client side and to the saturation of the network and server. A prototype has been built and an exhaustive set of experiments covering several platforms, wireless networks and a wide range of viewer velocities has been conducted. Results show that the approach is feasible, effective and robust.Postprint (published version