TAILIEUCHUNG - Advances in Haptics Part 5

Tham khảo tài liệu 'advances in haptics part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 152 Advances in Haptics 4. Results Through this work we have devised and tested a number of human computer interface paradigms capable of enabling the two-dimensional screen interface to be perceived without use of the eyes. These systems involve head-pose tracking for obtaining the gaze position on a virtual screen and various methods of receiving haptic feedback for interpreting screen content at the gaze position. Our preliminary experimental results have shown that using the head as an interface pointing device is an effective means of selecting screen regions for interpretation and for manipulating screen objects without use of the eyes. When combined with haptic feedback a blind user is able to perceive the location and approximate dimensions of the virtual screen as well as the approximate locations of objects located on the screen after briefly browsing over the screen area. The use of haptic signal intensity to perceive window edges and their layer is also possible to a limited extent with the TENS interface. After continued use users were able to perceive objects on the screen without any use of the eyes differentiate between files folders and controls based on their frequency locate specific items drag and drop items into open windows. Experienced users were also able to operate pull-down menus and move and resize windows without sight. The interpretation of screen objects involves devising varying haptic feedback signals for identifying different screen objects. Learning to identify various screen elements based on their haptic feedback proved time consuming on all haptic feedback devices. However this learning procedure can be facilitated by providing speech or Braille output to identify elements when they are gazed at for a brief period. As far as screen element interpretation was concerned haptic feedback via the Braille display surpassed the TENS and vibro-tactile interfaces. This was mainly because the pictorial nature of glyphs used is more .

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