In the version of this Article originally published, the sentence ‘The authors would also like to thank D. Shen for an initial discussion of the problem when he was with the University of North Carolina at Chapel Hill’ at the end of the Acknowledgements section was included by mistake; it should have been removed. Also, the text ‘D.S. was involved in the initial discussion of the problem when he was with the University of North Carolina at Chapel Hill’ was missing from the Author contributions section; it should have been included before the last sentence. This has now been corrected.
ASJC Scopus subject areas
- Human-Computer Interaction
- Computer Vision and Pattern Recognition
- Computer Networks and Communications
- Artificial Intelligence