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We consider a geometric inference problem for an imaging system consisting of a camera that views the world through a planar, rectangular sheet of glitter. We describe a procedure to calibrate this imaging geometry as a generalized camera which characterizes the subset of the light field viewed through each piece of glitter. We propose an easy to construct physical prototype and characterize its performance...
Images are important to fighting sex trafficking because they are: (a) used to advertise for sex services, (b) shared among criminal networks, and (c) connect a person in an image to the place where the image was taken. This work explores the ability to link images to indoor places in order to support the investigation and prosecution of criminal activity. We propose a framework which includes a database...
Many computer vision applications rely on matching features of a query image to reference data sets, but little work has explored how quickly data sets become out of date. In this paper we measure feature matching performance across 5 years of time-lapse data from 20 static cameras to empirically study how feature matching is affected by changing sunlight direction, seasons, weather, and the structural...
Five years ago we reported at AIPR on a nascent project to archive images from every webcam in the world and to develop algorithms to geo-locate, calibrate, and annotate this data. This archive of many outdoor scenes (AMOS) has now grown to include 28000 live outdoor cameras and over 630 million images. This is actively being used in projects ranging from large scale environmental monitoring to characterizing...
The vast amount of public photographic data posted and shared on Facebook, Instragram and other forms of social media offers an unprecedented visual archive of the world. This archive captures events ranging from birthdays, trips, and graduations to lethal conflicts and human rights violations. Because this data is public, it has led to a new genre of journalism, one led by citizens finding, analyzing,...
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