Niklas Elmqvist, Ph.D.

@article{Zhao2015,
title = {Sketcholution: Interaction Histories for Sketching},
author = {Zhenpeng Zhao and William Benjamin and Niklas Elmqvist and K. Ramani},
url = {http://www.umiacs.umd.edu/~elm/projects/sketcholution/sketcholution.pdf, Paper
https://www.youtube.com/watch?v=SYvkIdJQtEk, Youtube video},
year = {2015},
date = {2015-05-16},
journal = {International Journal of Human-Computer Studies},
volume = {82},
pages = {11--20},
abstract = {We present Sketcholution, a method for automatically creating visual histories of hand-drawn sketches. Such visual histories are useful for a designer to reflect on a sketch, communicate ideas to others, and fork from or revert to an earlier point in the creative process. Our approach uses a bottom-up agglomerative clustering mechanism that groups adjacent frames based on their perceptual similarity while maintaining the causality of how a sketch was constructed. The resulting aggregation dendrogram can be cut at any level depending on available display space, and can be used to create a visual history consisting of either a comic strip of highlights, or a single annotated summary frame. We conducted a user study comparing the speed and accuracy of participants recovering causality in a sketch history using comic strips, summary frames, and simple animations. Although animations with interaction may seem better than static graphics, our results show that both comic strip and summary frame significantly outperform animation.},
keywords = {}
}

@inproceedings{Badam2014a,
title = {Tracing and Sketching Performance using Blunt-Tipped Styli on Direct-Touch Tablets},
author = {Sriram Karthik Badam and Senthil Chandrasegaran and Niklas Elmqvist and Karthik Ramani},
url = {http://www.umiacs.umd.edu/~elm/projects/sketch-media/sketch-media.pdf, Paper
http://www.slideshare.net/NickElm/tracing-and-sketching-performance-using-blunttipped-styli-on-directtouch-tablets, Slides},
year = {2014},
date = {2014-07-01},
booktitle = {Proceedings of the ACM Conference on Advanced Visual Interfaces},
pages = {193--200},
abstract = {Direct-touch tablets are quickly replacing traditional pen-and-paper tools in many applications, but not in case of the designer’s sketchbook. In this paper, we explore the tradeoffs inherent in replacing such paper sketchbooks with digital tablets in terms of two major tasks: tracing and free-hand sketching. Given the importance of the pen for sketching, we also study the impact of using a blunt-and-soft-tipped capacitive stylus in tablet settings. We thus conducted experiments to evaluate three sketch media: pen-paper, finger-tablet, and stylus-tablet based on the above tasks. We analyzed the tracing data with respect to speed and accuracy, and the quality of the free-hand sketches through a crowdsourced survey. The pen-paper and stylus-tablet media both performed significantly better than the finger-tablet medium in accuracy, while the pen-paper sketches were significantly rated higher quality compared to both tablet interfaces. A follow-up study comparing the performance of this stylus with a sharp, hard-tip version showed no significant difference in tracing performance, though participants preferred the sharp tip for sketching.},
keywords = {}
}

@inproceedings{Benjamin2014,
title = {Juxtapoze: supporting serendipity and creative expression in clipart compositions},
author = {William Benjamin and Senthil Chandrasegaran and Devarajan Ramanujan and Niklas Elmqvist and SVN Vishwanathan and Karthik Ramani},
url = {http://www.umiacs.umd.edu/~elm/projects/juxtapoze/juxtapoze.pdf, Paper
https://youtu.be/YkLFX16fSrA, Youtube video},
year = {2014},
date = {2014-01-01},
booktitle = {Proceedings of the ACM Conference on Human Factors in Computing Systems},
pages = {341--350},
abstract = {Juxtapoze is a clipart composition workflow that supports creative expression and serendipitous discoveries in the shape domain. We achieve creative expression by supporting a workflow of searching, editing, and composing: the user queries the shape database using strokes, selects the desired search result, and finally modifies the selected image before composing it into the overall drawing. Serendipitous discovery of shapes is facilitated by allowing multiple exploration channels, such as doodles, shape filtering, and relaxed search. Results from a qualitative evaluation show that Juxtapoze makes the process of creating image compositions enjoyable and supports creative expression and serendipity.},
keywords = {}
}

@inproceedings{Zhao2014,
title = {skWiki: A Multimedia Sketching System for Collaborative Creativity},
author = {Zhenpeng Zhao and Sriram Karthik Badam and Senthil Chandrasegaran and Deo Gun Park and Niklas Elmqvist and Lorraine Kisselburgh and Karthik Ramani},
url = {http://www.umiacs.umd.edu/~elm/projects/skwiki/skwiki.pdf, Paper
https://www.youtube.com/watch?v=QxtTR14EXFQ, Video
http://www.slideshare.net/NickElm/skwiki-a-multimedia-sketching-system-for-collaborative-creativity, Slides},
year = {2014},
date = {2014-01-01},
booktitle = {Proceedings of the ACM Conference on Human Factors in Computing Systems},
pages = {1235--1244},
abstract = {We present skWiki, a web application framework for collaborative creativity in digital multimedia projects, including text, hand-drawn sketches, and photographs. skWiki overcomes common drawbacks of existing wiki software by providing a rich viewer/editor architecture for all media types that is integrated into the web browser itself, thus avoiding dependence on client-side editors. Instead of files, skWiki uses the concept of paths as trajectories of persistent state over time. This model has intrinsic support for collaborative editing, including cloning, branching, and merging paths edited by multiple contributors. We demonstrate skWiki\'s utility using a qualitative, sketching-based user study.},
keywords = {}
}