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(This article was first published on <strong><a href="http://blog.revolutionanalytics.com/2017/01/analyzing-emotions-in-video-with-r.html"> Revolutions</a></strong>, and kindly contributed to <a rel="nofollow" href="https://www.r-bloggers.com/">R-bloggers)</a> </div>
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<p>In the run-up to the election last year, Ben Heubl from The Economist used the <a target="_blank" rel="nofollow" href="https://www.microsoft.com/cognitive-services/en-us/emotion-api">Emotion API</a> to <a target="_blank" rel="nofollow" href="http://blog.revolutionanalytics.com/2016/10/debate-emotions.html">chart the emotions portrayed by the candidates during the debates</a> (note: auto-play video in that link). In his <a target="_blank" rel="nofollow" href="https://benheubl.github.io/data%20analysis/fr/">walkthrough of the implementation</a>, Ben used Python to process the video files, and R to create the charts from the sentiment scores generated by the API.</p>
<p>Now, the <a target="_blank" rel="nofollow" href="https://blog.exploratory.io/analyzing-emotions-using-facial-expressions-in-video-with-microsoft-ai-and-r-8f7585dd0780">learn dplyr blog has recreated the analysis using R</a>. A detailed walkthrough steps through the process of creating a free Emotion API key, submitting a video to the API using the <a target="_blank" rel="nofollow" href="https://mran.microsoft.com/package/httr/">httr package</a>, and retrieving the emotion scores as an R data frame. </p>
<p>With the emotion scores in hand, the blog visualizes the data using <a target="_blank" rel="nofollow" href="https://exploratory.io/">exploratory.io</a>, a web-based data exploration GUI based on R. With a few points and clicks (plus a little R code to wrangle the data), Exploratory produced this chart of the emotions expressed by the two candidates over time. (Click for an interactive version.) </p>
<p><a target="_blank" rel="nofollow" href="https://exploratory.io/viz/kanaugust/4502905098135296?cb=1478527921701"><img title="Exploratory" alt="Exploratory" src="http://revolution-computing.typepad.com/.a/6a010534b1db25970b01b8d24e2856970c-800wi" border="0"></a></p>
<p>For the complete details, including the R code used to interface with the Emotion API, follow the link below.</p>
<p>Learn dplyr: <a target="_blank" rel="nofollow" href="https://blog.exploratory.io/analyzing-emotions-using-facial-expressions-in-video-with-microsoft-ai-and-r-8f7585dd0780#.qfrnqvjbp">Analyzing Emotions using Facial Expressions in Video with Microsoft AI and R</a></p>
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