10 Parallax barrierA parallax barrier is a device to allow a liquid crystal display to show a stereoscopic image without the need for the viewer to wear 3D glasses.liquid crystal display = LCDstereoscopic image = ภาพมุมมองสามมิติ
11 Barrier model The barrier model is entirely defined by the following five real-valued parameters.Barrier period or line spacing in lines per foot (lpf)Angular orientation (line tilt) in degrees from verticalDuty cycle (fraction of opaque to total period)Lateral shift (left-right) along the plane of the displayscreen from some reference pointOptical distance that the barrier is located in front ofthe rear display screen
14 Image Computation Algorithm Figure 5: The barrier step function is shown.
15 Controller algorithmFigure 6: Controller block diagram illustrates three main functions:view distance, rapid steering, and 2-viewer control.A real-time controller sets the barrier period, duty cycle,and barrier shift at each frame update. The controller con-tains three modules, as shown in Figure 6. Each of thesemodules is described in turn.
19 Two-viewer barrier control Figure 8: Repetition of channel lobes in space occurs at regularlyspaced intervals. Although a limited number of lobes are shownhere, this pattern continues outward in each direction.