VINST/ Visual Diaries

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What Omid saw on his way to work on 3 different days.

Novel ego motion detection:

Ego motion can be affected by many things: the activity which is to be performed, the environment and etc. Considering a fixed activity - walking to work - many factors such as an obstruction on the road, deviation from the normal activity or interacting with objects or people can cause deviations from the repeated ego motion. As our first attempt, we aimed to detect novel ego motions which we planned to use as a simple candidate memory selection process. Such memory selection process will select the memories depicted below from the sample data set depicted above.

Using such an approach will allow us to highlight temporal segments in videos such as:
  • Unplanned interactions with people/objects
  • Changes in the environment which lead to changes in the usual ego motion associated with a specific activity e.g. a street getting blocked while walking to X
  • The first time an activity is performed (a new route is being travelled, a new trajectory is taken for the same destination, a new place is visited and etc)
  • Significant changes in the environment e.g. the first time it heavily snows
We detected novel ego motions by aligning the videos based on a measure reflecting the similarity of the view point of two frames. Novelty is then defined as the frames which do not have any correspondences in other videos. The figure below depicts one such alignment.

Larger alignment results

Meeting a friend

Ice cream shopping

Running into a friend

Giving directions



Stefan Carlsson
Assistant Professor
Josephine Sullivan
PhD Student
Omid Aghazadeh


"Novelty detection from an Egocentric perspective"
Omid Aghazadeh , Josephine Sullivan , Stefan Carlsson .
CVPR 2011    PDF    Poster


  • W31 Dataset: This data set consists of 31 videos capturing the visual experience of a subject walking from a metro station to work, subsampled at 1 HZ. It consists of 7236 images in total. Each image is annotated with a location id which covers 9 unique labels in total. Temporal segments corresponding to novel ego motions are annotated as well. Download the data set from here and the annotations from here.


Computer Vision and Active Perception Laboratory