  This paper introduces the largest and most diverse collection of rectified
stereo image pairs to the research community, KeystoneDepth, consisting of tens
of thousands of stereographs of historical people, events, objects, and scenes
between 1860 and 1963. Leveraging the Keystone-Mast raw scans from the
California Museum of Photography, we apply multiple processing steps to produce
clean stereo image pairs, complete with calibration data, rectification
transforms, and depthmaps. A second contribution is a novel approach for view
synthesis that runs at real-time rates on a mobile device, simulating the
experience of looking through an open window into these historical scenes. We
produce results for thousands of antique stereographs, capturing many important
historical moments.
