Trip Synopsis: 60km in 60sec
Computer Graphics Forum (Proceedings of Pacific Graphics 2016)
Hui Huang1;2         Dani Lischinski3          Zhuming Hao2         Minglun Gong4          Marc Christie5          Daniel Cohen-Or6

1Shenzhen University            2 SIAT              3The Hebrew University of Jerusalem           4Memorial University of Newfoundland      

 5IRISA/INRIA Rennes Bretagne          6Tel Aviv University




Figure 1: Our generated camera trajectory for a 60 second synopsis of a trip between two cities, 60 kilometers apart. The trajectory iscontinuous and smooth, and the camera speed is adapted to the visual interest we compute in the scene (red to cyan: high to low speed).


Abstract 

Computerized route planning tools are widely used today by travelers all around the globe, while 3D terrain and urban models are becoming increasingly elaborate and abundant. This makes it feasible to generate a virtual 3D flyby along a planned route. Such a flyby may be useful, either as a preview of the trip, or as an after-the-fact visual summary. However, a naively generated preview is likely to contain many boring portions, while skipping too quickly over areas worthy of attention.

In this paper, we introduce 3D trip synopsis: a continuous visual summary of a trip that attempts to maximize the total amount of visual interest seen by the camera. The main challenge is to generate a synopsis of a prescribed short duration, while ensuring a visually smooth camera motion. Using an application-specific visual interest metric, we measure the visual interest at a set of viewpoints along an initial camera path, and maximize the amount of visual interest seen in the synopsis by varying the speed along the route. A new camera path is then computed using optimization to simultaneously satisfy requirements, such as smoothness, focus and distance to the route. The process is repeated until convergence.

The main technical contribution of this work is a new camera control method, which iteratively adjusts the camera trajectory and determines all of the camera trajectory parameters, including the camera position, altitude, heading, and tilt. Our results demonstrate the effectiveness of our trip synopses, compared to a number of alternatives.


Results


Figure 2: Screen shots from our trip synopses.


Acknowledgments

We thank the reviewers for their constructive comments. This work was supported in part by NSFC (61522213, 61379090, 61232011), National 973 Program (2015CB352501, 2014CB360503), Guangdong Science and Technology Program (2015A030312015, 2014B050502009, 2014TX01X033, 2016A050503036), Shenzhen Innovation Program (JCYJ20151015151249564), NSERC (293127) and Israel Science Foundation.


Bibtex

@ARTICLE{Huang2016,
    title = {Trip Synopsis: 60km in 60sec},
    author = {Hui Huang, Dani Lischinski, Zhuming Hao, Minglun Gong, Marc Christie, Daniel Cohen-Or},
    journal = {Computer Graphics Forum (Proceedings of Pacific Graphics)},
    volume = {35},
    number = {7},
    pages = {107-116},
    year={2016}, 
}
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