Enlargement of Continuous Perceived Depth Region in Depth-fused 3-D Display

We solve a serious problem affecting depth-fused three-dimensional (3-D) (DFD) displays wherein the maximum depth between front and rear planes is limited, because depth fusing from front and rear images into one 3-D image becomes impossible. We also propose a perception model for this deep DFD display. When the distance between planes is large, the perceived depth separates into positions near the front plane, near the rear plane, and around the midpoint. The maximum depth range can be successfully enlarged by spatial-frequency modulation of the front and rear images. In particular, when the high-frequency component of the front and rear images are cut off by the spatial-frequency modulation, the perceived depth has one fused position and a linear dependence, even at large distances between the front and rear planes.