Focus-plus-context screen
A focus-plus-context screen is a specialized type of display device that consists of one or more high-resolution "focus" displays embedded into a larger low-resolution "context" display. Image content is displayed across all display regions, such that the scaling of the image is preserved, while its resolution varies across the display regions.
![](../I/FocusPlusContextScreen.jpg.webp)
The original focus-plus-context screen prototype consisted of an 18"/45 cm LCD screen embedded in a 5'/150 cm front-projected screen. Alternative designs have been proposed that achieve the mixed-resolution effect by combining two or more projectors with different focal lengths [1]
While the high-resolution area of the original prototype was located at a fixed location, follow-up projects have obtained a movable focus area by using a Tablet PC.
Patrick Baudisch[2] is the inventor of focus-plus-context screens (2000, while at Xerox PARC)
Advantages
- Allows users to leverage their foveal and their peripheral vision
- Cheaper to manufacture than a display that is high-resolution across the entire display surface
- Displays entirety and details of large images in a single view. Unlike approaches that combine entirety and details in software (fisheye views), focus-plus-context screens do not introduce distortion.
Disadvantages
- In existing implementations, the focus display is either fixed or moving it is physically demanding
References
- Ashdown, M.; Robinson, P. (2005). "Escritoire: A Personal Projected Display". IEEE MultiMedia. 12: 34–42. doi:10.1109/MMUL.2005.18. hdl:11025/1625.
- Patrick Baudisch
- Notes
- Patrick Baudisch; Nathan Good; Paul Stewart (2001). Focus plus context screens: combining display technology with visualization techniques. Proceedings of the 14th annual ACM Symposium on User Interface Software and Technology. pp. 31–40.
- Patrick Baudisch, Nathan Good, Victoria Bellotti, and Pamela Schraedley (2002). Keeping things in context: a comparative evaluation of focus plus context screens, overviews, and zooming. Proceedings of ACM CHI Conference on Human Factors in Computing Systems. pp. 259–266.
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: CS1 maint: multiple names: authors list (link) - Yudhijit Bhattacharjee. In a Seamless Image, the Great and Small. In The New York Times, Thursday, March 14, 2002.
- Mark Ashdown; Peter Robinson (2005). Escritoire: A Personal Projected Display. IEEE Multimedia January/March 2005 (Vol. 12, No. 1). pp. 34–42. doi:10.1109/MMUL.2005.18. hdl:11025/1625.
- Johnny Lee; Scott Hudson; Jay Summet (2005). Moveable Interactive Projected Displays Using Projector Based Tracking. Proceedings of the 18th annual ACM Symposium on User Interface Software and Technology. pp. 63–72.
- Johan Sanneblad; Lars Erik Holmquist (2005). Ubiquitous Graphics. In ACM SIGGRAPH 2005 Emerging Technologies.