Seeing Behind the Camera : Identifying the Authorship of a Photograph ( Supplementary Material )

This document includes supplemental results to those found in the main text. In this document, we present the dendrogram discussed in our “Schools of thought” section from the main text. We used this dendrogram to draw the conclusions about clusters of photographers that we describe in the main text. We also include larger and more readable versions of Figures 4-5 from the main text, which capture the coarse object categories that photographers tend to shoot, and how the one-vs-all SVMs weigh each category. We also include a few results that we did not have room for in the main text. First, we include a figure which shows the best feature for distinguishing each pair of photographers. From this figure, we can see that even features which do not perform well overall can be useful for distinguishing certain photographers. Using this result, we include examples of misclassifications made by the best performing feature for select pairs of photographers. This illustrates how challenging the problem is since even the best feature for that particular photographer pair makes mistakes. We then include additional examples of synthetic photographs generated by our algorithm, to complement the results shown in Section 6.3 of the main text. Finally, we show additional t-SNE visualizations at a higher resolution than those shown in our main text. These visualizations illustrate how the different features we tested group photographs and give us insight into how they are doing so.