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Despite recent open data initiatives in many countries, a significant percentage of the data provided is in nonmachine-readable formats like image format rather than in a machine-readable electronic format, thereby restricting their usability. This paper describes the first unified framework for converting legacy open data in image format into a machinereadable and reusable format by using crowdsourcing. Crowd workers are asked not only to extract data from an image of a chart but also todoi:10.1109/dsaa.2015.7344801 dblp:conf/dsaa/OyamaBODK15 fatcat:onalbuzbdbezle5mogrlzzenyq