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Georg Geiser

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Publications by Georg Geiser (bibliography)

1989

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Geiser, Georg (1989): Handprinted Data Entry with a Touch-Sensitive Numeric Keypad. In: Proceedings of the Human Factors Society 33rd Annual Meeting 1989. pp. 305-309.

“A new method for hand printed data entry is proposed for those user tasks where only few characters have to be entered. The basic idea is to use a numeric keypad as writing surface for one finger. For this purpose the keys are equipped with touch sensors, and display elements are fitted to the keys and the intermediate spaces. By means of the arrangement of the keys in the keypad the writing surface has a structure of rows and columns which motivates the user to produce characters with a standard format and uniform line elements. In order to allow characters to be sloppily written to some extent, the method of dynamic programming was applied for a nonlinear adaptation of pattern and prototype vectors. A first series of experiments showed that error rates of the subjects (e.g. omissions, confusions) and of the pattern recognition system (errors, rejections) are very low.”

1987

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Geiser, Georg (1987): Viewing Geometry of Single or Multiple Screen Displays with Planar or Curved Surface. In: Bullinger, Hans-Jorg and Shackel, Brian (eds.) INTERACT 87 - 2nd IFIP International Conference on Human-Computer Interaction September 1-4, 1987, Stuttgart, Germany. pp. 771-776.

“The viewing geometry of single or multiple screen display systems determines the observer area and observer space. Screens with convex curvature have considerably smaller observer area, whereas concave screens have a substantially increased observer area compared with the planar screen. Furthermore concave screens show a more uniform brightness with less annoyance due to reflection. Besides rules for the arrangement of screens, it is concluded that the feasibility of concave screens is to be investigated.”

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