Extracting Visual Encodings from Map Chart Images with Color-Encoded Scalar Values

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Carlos L.R.
Dávalos J.Z.
Lago A.F.
Loro H.
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Institute of Electrical and Electronics Engineers Inc.
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Map charts are used in diverse domains to show geographic data (e.g., climate research, oceanography, business analysis, etc.). These charts can be found in news articles, scientific papers, and on the Web. However, many map charts are available only as bitmap images, hindering machine interpretation of the visualized data for indexing and reuse. We propose a pipeline to recover both the visual encodings and underlying data from bitmap images of geographic maps with color-encoded scalar values. We evaluate our results using map images from scientific documents, achieving high accuracy along each step of our proposal. In addition, we present two applications: data extraction and map reprojection to enable improved visual representations of map charts.
This work was supported by grant 234-2015-FONDECYT (Master Program) from Cienciactiva of the National Council for Science,Technology and Technological Innovation (CONCYTEC-PERU).
Palabras clave
Visual representations, Color image processing, Encoding (symbols), Graphic methods, Business analysis, Climate research, Machine interpretation, Map interpretation, Scientific documents, Scientific papers, Visual encodings, Image coding