To reduce the speckle noise in a holographic display, a method by separating the pixel or object points of reconstructed images is proposed using a light source array. The multiple sparse images are reconstructed and shifted together to form the complete images with the speckleless noise. The simulation results show that the speckle noise is reduced from 51% to 21% by using a 3 × 3 light source array. It is expected that it could be used for realizing a dynamical 3D holographic display with the less speckle noise in the future.
A method for estimating the proper slanted angle of an autostereoscopic lenticular lens sheet is proposed in this paper. A three‐dimensional(3D) display with the proper slanted lenticular lens sheet has the lower three‐dimension al(3D) crosstalk and less moiré pattern. To get the proper angle, a mathematical model describing the optical performance of the lenticular lens is established on the Snell's law and the ray tracing method. In this model, the shapes and the distribution of the display's subpixels are introduced as an important element to affect the slanted angle. A15.6” 3D display designed by this method is reported with a lower crosstalk and better 3D performance.
Eye‐tracking based autostereoscopic 3D display is a promising technology to provide high resolution and low crosstalk stereoscopic images to the user without wearing any glasses. However, current systems fail to provide satisfactory viewing experience due to inherent latency caused by the tracking camera system and algorithm computation time and the low reliability of tracking algorithms, especially when users are in fast motion. High instantaneous crosstalk and intermittent interference patterns will be observed, which significantly degrades the immersive level of the viewing experience. This becomes even worse when the autostereoscopic 3D display is used to provide a simulated reality (SR) experience, in which the user constantly moves the head to explore the virtual reality space from different viewing directions. To solve the problem, this paper proposes a dual‐camera tracking system, focusing on the key design factors to improve its tracking reliability and reduce the user perceived latency. For the latter, it leverages motion prediction and compensate the latency with predictive rendering technique. To measure the performance, this paper defines the Perceived Autostereoscopic 3D Display Motion to Picture (PAMTP) latency to represent the impact of the system latency on the viewing experience. PAMTP latency and the instantaneous crosstalk are evaluated via simulations and experiments, which show our method can reduce the instantaneous crosstalk by nearly 70% and provide highly reliable tracking.
In this study, two local calibration method of 3D display screen is used to accurately measure and adjust the local parameter deviation in large-size 3D display screen. They can improve the yield of 3D display screen, enhance the imaging quality of display screen and reduce crosstalk.
In this study, the effects of lens translation and zooming on 3D display system are discussed theoretically and experimentally in the current common lens scale. The results show that the lens translation can give better image resolution and details.
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