Auto-Directed Video Stabilization with Robust L1 Optimal Camera Paths

Posted by Matthias Grundmann, Vivek Kwatra, and Irfan Essa, Research Team

Earlier this year, we announced the launch of new features on the YouTube Video Editor, including stabilization for shaky videos, with the ability to preview them in real-time. The core technology behind this feature is detailed in this paper, which will be presented at the IEEE International Conference on Computer Vision and Pattern Recognition (CVPR 2011).

Casually shot videos captured by handheld or mobile cameras suffer from significant amount of shake. Existing in-camera stabilization methods dampen high-frequency jitter but do not suppress low-frequency movements and bounces, such as those observed in videos captured by a walking person. On the other hand, most professionally shot videos usually consist of carefully designed camera configurations, using specialized equipment such as tripods or camera dollies, and employ ease-in and ease-out for transitions. Our goal was to devise a completely automatic method for converting casual shaky footage into more pleasant and professional looking videos.



Our technique mimics the cinematographic principles outlined above by automatically determining the best camera path using a robust optimization technique. The original, shaky camera path is divided into a set of segments, each approximated by either a constant, linear or parabolic motion. Our optimization finds the best of all possible partitions using a computationally efficient and stable algorithm.

To achieve real-time performance on the web, we distribute the computation across multiple machines in the cloud. This enables us to provide users with a real-time preview and interactive control of the stabilized result. Above we provide a video demonstration of how to use this feature on the YouTube Editor. We will also demo this live at Google’s exhibition booth in CVPR 2011.

For further details, please read our paper.

Google at CVPR 2011

Posted by Mei Han and Sergey Ioffe, Research Team

The computer vision community will get together in Colorado Springs the week of June 20th for the IEEE International Conference on Computer Vision and Pattern Recognition (CVPR 2011). This year will see a record number of people attending the conference and 27 co-located workshops and tutorials. The registration was closed at 1500 attendees even before the conference started.

Computer Vision is at the core of many Google products, such as Image Search, YouTube, Street View, Picasa, and Goggles, and as always, Google is involved in several ways with CVPR. Andrew Senior is serving as an area chair of CVPR 2011 and many Googlers are reviewers. Googlers also co-authored these papers:

• Where's Waldo: Matching People in Images of Crowds by Rahul Garg, Deva Ramanan, Steve Seitz, Noah Snavely
• Visual and Semantic Similarity in ImageNet by Thomas Deselaers, Vittorio Ferrari
• Multicore Bundle Adjustment by Changchang Wu, Sameer Agarwal, Brian Curless, Steve Seitz
• A Hierarchical Conditional Random Field Model for Labeling and Segmenting Images of Street Scenes by Qixing Huang, Mei Han, Bo Wu, Sergey Ioffe
• Kernelized Structural SVM Learning for Supervised Object Segmentation by Luca Bertelli, Tianli Yu, Diem Vu, Salih Gokturk
• Discriminative Tag Learning on YouTube Videos with Latent Sub-tags by Weilong Yang, George Toderici
• Auto-Directed Video Stabilization with Robust L1 Optimal Camera Paths by Matthias Grundmann, Vivek Kwatra, Irfan Essa
• Image Saliency: From Local to Global Context by Meng Wang, Janusz Konrad, Prakash Ishwar, Yushi Jing, Henry Rowley

If you are attending the conference, stop by Google’s exhibition booth. In addition to talking with Google researchers, you will get to see examples of exciting computer vision research that has made it into Google products including, among others, the following:

• Google Earth Facade Shadow Removal by Mei Han, Vivek Kwatra, and Shengyang Dai
  We will demonstrate our technique for removing shadows and other lighting/texture artifacts from building facades in Google Earth. We obtain cleaner, clearer, and more uniform textures which provide users with an improved visual experience.
• Video Stabilization on YouTube Editor by Matthias Grundmann, Vivek Kwatra, and Irfan Essa
  Casually shot videos captured by handheld or mobile cameras suffer from significant amount of shake. In contrast, professionally shot video usually employs stabilization equipment such as tripods or camera dollies, and employ ease-in and ease-out for transitions. Our technique mimics these cinematographic principles, by optimally dividing the original, shaky camera path into a set of segments and approximating each with either constant, linear or parabolic motion using a computationally efficient and stable algorithm. We will showcase a live version of our algorithm, featuring real-time performance and interactive control, which is publicly available at youtube.com/editor.
• Tag Suggest for YouTube by George Toderici and Mehmet Emre Sargin
  YouTube offers millions of users the opportunity to upload videos and share them with their friends. Many users would love to have their videos discoverable but don't annotate them properly. One new feature on YouTube that seeks to address this problem is tag prediction based on video content and independently based on text metadata.

6/17/2011 UPDATE: "Posted by" was changed to include Sergey Ioffe.