Adaptive typography for dynamic mapping environments

Didier Bardon

doi:10.1117/12.44416

1 August 1991 Adaptive typography for dynamic mapping environments

Didier Bardon

Proceedings Volume 1460, Image Handling and Reproduction Systems Integration; (1991) https://doi.org/10.1117/12.44416
Event: Electronic Imaging '91, 1991, San Jose, CA, United States

Abstract

When typography moves across a map, it passes over areas of different colors, densities, and textures. In such a dynamic environment, the aspect of typography must be constantly adapted to provide disernibility for every new background. Adaptive typography undergoes two adaptive operations: background control and contrast control. The background control prevents the features of the map (edges, lines, abrupt changes of densities) from destroying the integrity of the letterform. This is achieved by smoothing the features of the map in the area where a text label is displayed. The modified area is limited to the space covered by the characters of the label. Dispositions are taken to insure that the smoothing operation does not introduce any new visual noise. The contrast control assures that there are sufficient lightness differences between the typography and its ever-changing background. For every new situation, background color and foreground color are compared and the foreground color lightness is adjusted according to a chosen contrast value. Criteria and methods of choosing the appropriate contrast value are presented as well as the experiments that led to them.

Citation Download Citation

Didier Bardon "Adaptive typography for dynamic mapping environments", Proc. SPIE 1460, Image Handling and Reproduction Systems Integration, (1 August 1991); https://doi.org/10.1117/12.44416

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