PhD MSc BSc
Latest news on experiment participation!
I am currently a Research Associate working on various projects at the lab. My research areas are:
- promoting research collaboration through CSCW
- user experience when using visualisations of complex data
- image-based feedback.
D. A. Robb, S. Padilla, T. S. Methven, B.Kalkreuter, M. J. Chantler. Image-based Emotion Feedback: How Does the Crowd Feel? And Why? DIS’17: Proceedings of the 2017 ACM Conference on Designing Interactive Systems. dx.doi.org/10.1145/3064663.3064665. Or download with this link
D. A. Robb, S. Padilla, T. S. Methven, B.Kalkreuter, M. J. Chantler. A Picture Paints a Thousand Words but Can it Paint Just One? DIS’16: Proceedings of the 2016 ACM Conference on Designing Interactive Systems. dx.doi.org/10.1145/2901790.2901791.
D. A. Robb, T. S. Methven, S. Padilla, M. J. Chantler Well-Connected: Promoting Collaboration by Effective Networking CSCW’16:19th ACM Conference on Computer Supported Cooperative Work & Social Computing Proceedings Companion dx.doi.org/10.1145/2818052.2874333.
See an example of this application in action near the bottom of this page here.
D. A. Robb, S. Padilla, B. Kalkreuter, M. J. Chantler Crowdsourced Feedback With Imagery Rather Than Text: Would Designers Use It? CHI’15: 33rd Annual ACM Conference on Human Factors in Computing Systems Proceedings dx.doi.org/10.1145/2702123.2702470.
D. A. Robb, S. Padilla, B. Kalkreuter, M. J. Chantler Moodsource: Enabling Perceptual and Emotional Feedback from Crowds CSCW’15: 18th ACM Conference on Computer Supported Cooperative Work & Social Computing Proceedings Companion dx.doi.org/10.1145/2685553.2702676.
Try the Demo 🙂. Best to use Chrome or Firefox rather than IE.
My PhD work was on CDI “Head-Crowd” project, an interdisciplinary project in the Schools of Mathematics and Computer Science (MACS) and Textile and Design (TEX). The focus is on perceptual image browsing, visual communication, visual summary and interpretation of visual design feedback.
Visual Crowd Communication
Moodsource: Enabling Perceptual and Emotional Feedback from Crowds
Part of my work on capturing visual feedback has involved building a perceptually relevant image browser populated with a set of abstract images. The images were screen-scraped from Flickr.com (See project acknowledgements below). Human perceptions of the relative similarity of the images were captured using techniques devised by Dr. Fraser Halley (See his PhD thesis under “PhD Thesis” in the Publications tab at the top of this page).
Abstract Image Set in the SOM Browser
The project abstract image set can be viewed in the Self Organising Map Browser. Images judged by observers as being highly similar to each other are grouped in stacks together. Adjacent stacks contain images judged more similar to each other than stacks farther apart. Note how the observers’ similarity judgements and the SOM construction algorithm has resulted in apparently themed regions in the browser. e.g. architectural at the top right, and highly abstract, colourful at the top left. Click the thumbnail image above to try out an HTML version of the SOM browser. (In our experiment it was built it in Flash and deployed to iOS on iPads.)
Try the browser in its 7×5 stack format as used in some of the more recent experiments which used a web app interface.
The SOM browser features in the latest publications and additionally in following publications:
S. Padilla, D. Robb, F. Halley, M. J. Chantler, Browsing Abstract Art by Appearance
Predicting Perceptions: The 3rd International Conference on Appearance, 17-19 April, 2012, Edinburgh, UK. Conference Proceedings Publication ISBN: 978-1-4716-6869-2, Pages: 100-103 Download PDF
S. Padilla, F. Halley, D. Robb, M. J. Chantler, Intuitive Large Image Database Browsing using Perceptual Similarity Enriched by Crowds Computer Analysis of Images and Patterns Lecture Notes in Computer Science Volume 8048, 2013, pp 169-176 Springer Link
Abstract Image Set in a 3D MDS Visualisation
View the image set in a 3D view as an animated GIF (8Mb)
The collective similarity judgements of human observers about the images can, perhaps, be better visualised in 3D “similarity” space. The closer an image is to another; the more similar those images were judged to be by observers. Conversely, the farther away two images are, the less similar they were judged to be. The similarity data was used as input to construct the SOM browser.
Perceptually Relevant Image Summaries
If a crowd were asked to give feedback by selecting images from the browser the gathered image selections might be so large in number as to overwhelm a designer seeking the feedback. To address this problem we developed an algorithm to generate visual summaries consisting of representative images. The algorithm uses clustering based on the image selections and the human perceptual similarity data previously gathered on the image set. (This is the same data that is used to organise the abstract image browser). The algorithm is described in the CHI’15 paper.
The image summarisation also features in the CSCW’15 extended abstract and additionally in following publications:
B. Kalkreuter and D. Robb. HeadCrowd: visual feedback for design in the Nordic Textile Journal, Special edition: Sustainability & Innovation in the Fashion Field, issue 1/2012, ISSN 1404-2487, CTF Publishing, Borås, Sweden. Pages 70-81 Download PDF
B. Kalkreuter, D. Robb, S. Padilla, M. J. Chantler Managing Creative Conversations Between Designers and Consumers Future Scan 2: Collective Voices, Association of Fashion and Textile Courses Conference Proceedings 2013, ISBN 978-1-907382-64-2, Pages 90-99 Download PDF
To show that communication is possible using the crowdsourced visual feedback method (CVFM) we carried out an experiment in which a group of participants were shown terms and asked to choose images from the abstract image browser to represent those terms. Summaries were made from the gathered images. The raw term image selections and the summaries were shown to another group of participants who rated the degree to which they could see the meaning of the terms in the stimuli they were shown. The term weights output by the second group of participants allowed the effectiveness of the communication and of the summarisation to be measured.
A video describes the experiment which features in the DIS’16 paper in the latest publications. The terms, the raw term image selection lists, and the algorithmically generated summaries from the experiment can be viewed using this viewer web application: The Fb Viewer (V2) is designed to be tablet (and ‘fablet’) friendly. It uses the latest jQueryMobile beta v 1.3. At the time of writing there is a slight problem with jQM v1.3 and Internet Explorer so if you are using Internet Explorer you may wish to view the desktop version.
Emotive Image Browser
To allow more figurative communication, a second browser was built. 2000 images were categorized by tagging them with terms from an emotion model. Thus every image has a normalized emotion tag frequency profile (see image above) representing the judgments of 20 paid, crowdsourced, participants.
Using these profiles, the set was filtered to 204 images covering a subset of emotions suited to design conversation. The emotive images are arranged in a SOM browser defined by the emotion profiles (frequency vectors) in a similar way to the abstract browser (based on similarity vectors).
Try the emotion image browser in its 7×5 stack format as used in some of the more recent experiments which used a web app interface.
The crowdsourced visual feedback method (CVFM) was evaluated in a study with interior design students puting forward their designs for feedback and a group of student participants acting as the crowd giving feedback. The crowd were shown the designs in a random order and asked “How did the design make you feel?”. They were asked to give thier feedback in the form of abstract images, emotive images and text. In the latest publications, the CHI paper reports the designer side of the evaluation and the CSCW extended abstract reports the crowd side. Below is a link to a 30 second video which accompanies the CHI paper.
Further Work on Image-based Emotion Feedback
In 2016 I had an opportunity to investigate the idea put forward in the CSCW’15 extended abstract that perhaps the experience of the feedback-givers in the crowd was influenced by their cognitive styles. I recruited 50 internet users from 19 to 77 years old, measured their cognititive styles with Blazhenkova & Kozhevnikov’s (2009) OSIVQ self report questionnare. They then did a feedback task rating three feedback formats (abstract images, emotion images and text). They also completed a post-task survey of mainly open questions. We found that engagement for the emotion images was significantly positively correlated with the degree to which participants were more visual than verbal in cognitive style. This is reported in a DIS’17 paper.
The project has established two databases of images for use in visual feedback. The images in the databases have been sourced from Google and Flickr and all have a Creative Commons licences. These contributors are acknowledged below.
I did my MSc here at Heriot-Watt. I made a rich web application called The Dendrogrammer as part of my dissertation. Here is a link to a demo of that app.