Time-sequential 3D Research Articles

A Low-Power Time-Synchronization Processor With Symmetric Even/Odd Timer for Charge-Shared LCD Driving of 3DTV Active Shutter Glasses

The proposed sync-processor enables a fractional-order time-synchronization to generate an efficient lens shutter-control timing for the charge-shared LCD lens driving in the 3DTV active shutter glasses. This design implements a universal sync-edge tracer as a pre-processor to form the unit event of the wireless sync-packet, a fractional-order timer to measure the timing period for accurate synchronization of the stereo-vision, and charge-shared driver controlled by the proposed symmetric even/odd timer to provide an efficient charge equalization method. The proposed symmetric even/odd timer block sequentially generates the driver switching events by distributing the driver activation into four pins of the LCD active shutter lenses to reuse the pre-pumped charge of the charge-shared LCD driver, which is sequentially shared between four pins for LCD lens. The proposed sequential lens control by distributing the charge-sharing events also enables the reduction of the hardware size required for the counters and overflow comparators in the switching timer to generate the pulse width modulation (PWM) pulse waveform of the LCD lens control for time-sequential 3D stereo-vision. The implemented one-chip solution, which is applied with all of the proposed techniques to improve the previous work, reduces about 140 $\mu\hbox{A}$ of LCD lens driving current, which results in about 30% current reduction in total. This paper describes the system's architecture and the details of the proposed techniques, while also identifying the key concepts and functions.

Multi-User Autostereoscopic 2D/3D Switchable Flat-Panel Display

An autostereoscopic display system which can allow multiple users to see 3D perception of the images without loss of resolution is introduced in this paper. It is a kind of time-sequential 3D systems incorporating eye tracking and directional optical design to realize free viewing. The whole system consists of five main parts: multi-user eye tracker, direct-view LCD, steerable LED array, MCU controller, and a suit of directional optics. It employs the theory of temporal multiplexing by the use of a LCD available to run at 120 Hz and utilizes a multi-user eye tracker to get the viewers' eye positions so as to control the steerable backlight to produce multiple pairs of exit pupils to the viewers' eyes. This paper describes the detailed structure of the system, the operation principle and the results obtained are also described. This approach differs from many existing ones in that it is switchable between 2D and 3D mode both with full resolution and is much thinner compared to other bulky systems with a width less than 20 cm.

When do new technologies become economically feasible? The case of three-dimensional television

This paper analyzes the timing of a new technology's economic feasibility using a simple yet novel approach. While the conventional wisdom that costs fall as cumulative production increases does not enable us to analyze this timing, the proposed approach enables us to do so using existing technological trends in the components that form a new technology's system. For 3D television, although the concepts that form the basis of 3D television have been known for many years, improvements in specific components within two-dimensional (2D) televisions such as the liquid crystal display (LCD) are finally making 3D television economically feasible. More specifically, improvements in the frame-rates of 2D LCDs are making it economically feasible to introduce time sequential 3D, which requires special glasses. Similarly, increases in the number of pixels per area (resolution) will probably make auto-stereoscopic 3D LCDs economically feasible in the next five to ten years and thus eliminate the need for special glasses.

A New Synchronous Visualization System for Time-sequential 3D Geographical Scene Display on a Computer with Multiple Screens

Three-dimensional(3D) visualization of geographical scene is an important technique in Virtual Geographical Environment(VGE) research for a broad variety of complex natural phenomena and geographical processes.Because geographical scenes are in general highly complex,large scale and with strong interactivity features,traditional single computer single-screen display method usually fails to meet the application requirements of user immersion,large field of view,and high-resolution visualization.Multi-screen display technique is an effective way to solve this problem.In the human-computer interaction of 3D geographical scenes visualization,in addition to supporting to control by hand through the input of keyboard,the system also supports automatically roaming along the path designed in advance.The path for automatically roaming is generated by Cardinal interpolation method which have some advantages: setting simply,good shape retention,and roaming smoothly.In this paper,a new synchronous visualization technique and system for time-sequential 3D geographical scenes displaying and roaming is introduced.The system is based on a stand-alone computer with multi-screens,using vegetation cover changes prior to,during and after the soil erosion control in Changting County,Fujian Province as an example.The software architecture,implementation techniques such as scene construction with three viewports,synchronous display and synchronous route roaming with three screens,vector layer symbolization,embedded broadcasting real-world scene pictures of 3D scene are discussed;thread synchronization mechanism is introduced;a 3D geographical scene was constructed to reflect the changes of soil erosion extent at three different time periods by overlaying true color remote sensing satellite images and DEM.This system has been used for showing the achievement of soil erosion control,and the effect sounds good.In addition to providing a strong immersion and big impact environment,the system also features dynamic change,enormous information,and strong expression.It has unique application capability for visualizing dynamic geographical scene.Last,these function modules are integrated in the 3D information system for synthetizing and management of virtual forest landscape(VisForest) which was designed and developed by research group coming from Spatial Information Research Centre of Fujian.

Crosstalk in stereoscopic displays: a review

Crosstalk, also known as ghosting or leakage, is a primary factor in determining the image quality of stereoscopic three dimensional (3D) displays. In a stereoscopic display, a separate perspective view is presented to each of the observer's two eyes in order to experience a 3D image with depth sensation. When crosstalk is present in a stereoscopic display, each eye will see a combination of the image intended for that eye, and some of the image intended for the other eye-making the image look doubled or ghosted. High levels of crosstalk can make stereoscopic images hard to fuse and lack fidelity, so it is important to achieve low levels of crosstalk in the development of high-quality stereoscopic displays. Descriptive and mathematical definitions of these terms are formalized and summarized. The mechanisms by which crosstalk occurs in different stereoscopic display technologies are also reviewed, including micropol 3D liquid crystal displays (LCDs), autostereoscopic (lenticular and parallax barrier), polarized projection, anaglyph, and time-sequential 3D on LCDs, plasma display panels and cathode ray tubes. Crosstalk reduction and crosstalk cancellation are also discussed along with methods of measuring and simulating crosstalk.

71.4: A Simulation Method of Time‐Sequential Stereoscopic Effect with Various LC Response Speed on Motion Pictures

AbstractA method to evaluate the visual effect of time‐sequential 3D is established. The characteristic of the simulation is to apply different cross‐talk values on each grey level according to LC response speed. Moreover, we made an experiment to compare the stereoscopic effect and annoyance of motion pictures with several settings of LC speed. The experiment result shows that the condition of LC response time with 10% to 90% Ton 8ms and 90% to 10% Toff 5ms has similar performance to that of the extremely‐fast LC, and is acceptable to 90% of the 27 assessors.

4D measurement and analysis of plantar deformation during walking and running

Understanding of deformation of the plantar part of the foot during running is important for shoe insert design. In recent years, new technologies for 4D measurement (time-sequential 3D shapes) hav...