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Lubomir Bourdev

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Publications by Lubomir Bourdev (bibliography)

2012

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Yang, Fei, Shechtman, Eli, Wang, Jue, Bourdev, Lubomir and Metaxas, Dimitris (2012): Face morphing using 3D-aware appearance optimization. In: Proceedings of the 2012 Conference on Graphics Interface 2012. pp. 93-99.

“Traditional automatic face morphing techniques tend to generate blurry intermediate frames when the two input faces differ significantly. We propose a new face morphing approach that deals explicitly with large pose and expression variations. We recover the 3D face geometry of the input images using a projection on a pre-learned 3D face subspace. The geometry is interpolated by factoring the expression and pose and varying them smoothly across the sequence. Finally we pose the morphing problem as an iterative optimization with an objective that combines similarity of each frame to the geometry-induced warped sources, with a similarity between neighboring frames for temporal coherence. Experimental results show that our method can generate higher quality face morphing results for more extreme pose, expression and appearance changes than previous methods.”

2011

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Pongnumkul, Suporn, Dontcheva, Mira, Li, Wilmot, Wang, Jue, Bourdev, Lubomir, Avidan, Shai and Cohen, Michael F. (2011): Pause-and-play: automatically linking screencast video tutorials with applications. In: Proceedings of the 2011 ACM Symposium on User Interface Software and Technology 2011. pp. 135-144.

“Video tutorials provide a convenient means for novices to learn new software applications. Unfortunately, staying in sync with a video while trying to use the target application at the same time requires users to repeatedly switch from the application to the video to pause or scrub backwards to replay missed steps. We present Pause-and-Play, a system that helps users work along with existing video tutorials. Pause-and-Play detects important events in the video and links them with corresponding events in the target application as the user tries to replicate the depicted procedure. This linking allows our system to automatically pause and play the video to stay in sync with the user. Pause-and-Play also supports convenient video navigation controls that are accessible from within the target application and allow the user to easily replay portions of the video without switching focus out of the application. Finally, since our system uses computer vision to detect events in existing videos and leverages application scripting APIs to obtain real time usage traces, our approach is largely independent of the specific target application and does not require access or modifications to application source code. We have implemented Pause-and-Play for two target applications, Google SketchUp and Adobe Photoshop, and we report on a user study that shows our system improves the user experience of working with video tutorials.”

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