The Hong Kong University of Science and Technology.
IEEE Trans Vis Comput Graph. 2009 Nov-Dec;15(6):1547-54. doi: 10.1109/TVCG.2009.144.
In this paper we present a novel focus+context zooming technique, which allows users to zoom into a route and its associated landmarks in a 3D urban environment from a 45-degree bird's-eye view. Through the creative utilization of the empty space in an urban environment, our technique can informatively reveal the focus region and minimize distortions to the context buildings. We first create more empty space in the 2D map by broadening the road with an adapted seam carving algorithm. A grid-based zooming technique is then used to enlarge the landmarks to reclaim the created empty space and thus reduce distortions to the other parts. Finally, an occlusion-free route visualization scheme adaptively scales the buildings occluding the route to make the route always visible to users. Our method can be conveniently integrated into Google Earth and Virtual Earth to provide seamless route zooming and help users better explore a city and plan their tours. It can also be used in other applications such as information overlay to a virtual city.
在本文中，我们提出了一种新颖的聚焦+上下文缩放技术，使用户能够从 45 度的鸟瞰视角在 3D 城市环境中放大路线及其关联地标。通过创造性地利用城市环境中的空白空间，我们的技术可以提供有价值的聚焦区域信息，并最大限度地减少对上下文建筑物的失真。我们首先通过扩展道路利用自适应的 seam carving 算法在 2D 地图中创建更多的空白空间。然后，使用基于网格的缩放技术来放大地标，以重新利用创建的空白空间，从而减少对其他部分的失真。最后，一个无遮挡的路线可视化方案自适应地调整遮挡路线的建筑物大小，以使用户始终能够看到路线。我们的方法可以方便地集成到 Google Earth 和 Virtual Earth 中，提供无缝的路线缩放，帮助用户更好地探索城市并规划旅行。它还可以用于其他应用，如虚拟城市的信息叠加。
