Biomedical Engineering Reference
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and to examine the effective difference between the modes and parameters set on the
system on the end user. The three experiments were a mobility based obstacle avoidance
walking maze test, a sit-down contrast discrimination hand-eye co-ordination chess-
board placement test, and finally a seated rolling ball interception task that involved
lowered frame rates.
4.1
Maze Test
In this test, there were 7 test subjects (6 male, 1 female). The maze test involved subjects
walking through a course while avoiding obstacles. The obstacles were large cardboard
boxes and office chairs with wheels. The placement of the obstacles was randomised
within the maze area and 5 different configurations of obstacle layout were developed,
one for each mode tested and kept consistent between subjects. Subjects were not al-
lowed to see the obstacle layout before each test. The starting point was around the
corner from the main rectangular maze area, and the end point was at a table at the far
end wall of the maze. There is a small black box on the table and the test ends when the
subject finds and picks up the box.
Fig. 10. Maze Test obstacle layout
For the test, both time to completion and number of collisions were recorded for all
subjects. Subjects were allowed to touch the obstacles in the maze so only unintentional
collisions were counted. The 5 modes tested were a control (full resolution, full colour),
4-level thresholding (full frame rate), binary thresholding (full frame rate) and reduced
frame rate at 15Hz and 4Hz (both with 4-level thresholding). Subjects were given 2
minutes accommodation time just before the test for each mode where they could adjust
to using the system around a cardboard box and two chairs placed away from the actual
maze area. Subjects were also given a minimum of 5 minutes break in between each
test.
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