Assumptions
To make the head up display system simple, I have assumed the system
and environment as follows
-
The position and direction of the vehicle has no error. The position of
the vehicle is updated by the DGPS (Differential Global Positioning system).
The commercial GPS system has error range from 100 meters to 150 meters.
The DGPS used for the safety truck project has 20 cm or better accuracy.
-
The location and direction of the human eyes is fixed, i.e. the driver
does not move or rotate his head during the driving.
-
The driver뭩 human eye system is a mono-graphic system, not a stereographic
system. Even though the road shape would be drawn as perspective projection,
all of the line drawings will be drawn on a plane.
-
The road is 2-dimentional structure. The real road has hills (slopes along
the longitudinal path) as well as left/right curve, so the road is 3D structure.
However I used only 2D data, x and y values. This assumption will be valid
in the some where in the visible range of the road in Minnesota. The test
track of MnRoad facilities is also located on the very flat field.
-
The vehicle parameters are the position data (x, y) and yaw angle only.
(There are no pitch and roll angle.)
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