A spatially multiplexed autostereoscopic 3D display design with a strip barrier consisting of RGB-color filters is
presented. The wavelength selective filter barrier emits the light from a display area larger than that of common
autostereoscopic barrier displays. However, such construction is still used rather rarely. The time sequential operation
mode is a supplemental option. Wavelength selective filter barrier arrangements exhibit characteristics different from
common barrier displays with similar barrier pitch and ascent. In particular these constructions show strong angular
luminance dependency under barrier inclination specified by correspondent slant angle. In time sequential
implementation it is important to avoid that quick eye or eyelid movement lead to visible color artifacts. Those
circumstances limit the possibility to find well working and usable display designs superior to usual barrier displays.
The newly introduced design is usable as a multi user display as well as a single user system with user adaptive control.
In case of tracked single user mode the adaption in x-z-direction is continuously. The design has been modelled with
simulation software developed for that purpose. The modelling of wavelength-selective barriers was used to calculate
the light ray distribution properties of that arrangement. For the experimental verification of the image separation and
evaluation of image quality, commercially available display components were combined for a display demonstrator.
A novel simulation tool has been developed for spatial multiplexed 3D displays. Main purpose of our software is the 3D display design with optical image splitter in particular lenticular grids or wavelength-selective barriers. As a result of interaction of image splitter with ray emitting displays a spatial light-modulator generating the autostereoscopic image representation was modeled. Based on the simulation model the interaction of optoelectronic devices with the defined spatial planes is described. Time-sequential multiplexing enables increasing the resolution of such 3D displays. On that reason the program was extended with an intermediate data cumulating component. The simulation program represents a stepwise quasi-static functionality and control of the arrangement. It calculates and renders the whole display ray emission and luminance distribution on viewing distance. The degree of result complexity will increase by using wavelength-selective barriers. Visible images at the viewer’s eye positon were determined by simulation after every switching operation of optical image splitter. The summation and evaluation of the resulting data is processed in correspondence to the equivalent time sequence. Hereby the simulation was expanded by a complex algorithm for automated search and validation of possible solutions in the multi-dimensional parameter space. For the multiview 3D display design a combination of ray-tracing and 3D rendering was used. Therefore the emitted light intensity distribution of each subpixel will be evaluated by researching in terms of color, luminance and visible area by using different content distribution on subpixel plane. The analysis of the accumulated data will deliver different solutions distinguished by standards of evaluation.
In this paper a procedure for crosstalk (CT) measurements on spatial-multiplexed multi-user autostereoscopic 3D displays with so-called viewing distance control (VDC) is presented. VDC makes use of a rendering method which allows shifting of the viewing distance for multiview displays by using a novel distribution of the content at sub-pixel level. Methods for CT measurements to date cannot be used as the measurements have to be executed at distances that are not defined in the standard procedures for stereoscopic displays. The measuring procedures used so far are not applicable, as neither a measurement process nor any test images are defined for the use at different viewing distances. As separate CT-measurement specifications for two-view and multiview autostereoscopic displays already exist, the authors propose a unified measurement process. This process is supposed to utilize both, the equipment, as well as the physical arrangement of measuring subject and instrument that are used so far. It has to be considered that, due to the basic functional principles, several quality measurement and evaluation criteria for 3D displays have emerged. Different autostereoscopic display technologies lead to different measurement procedures. A unified method for analyzing image quality features in 3D displays, requiring no enhanced effort but offering comparable results, is desirable.
Conventional multi-view displays spatially interlace various views of a 3D scene and form appropriate viewing channels.
However, they only support sufficient stereo quality within a limited range around the nominal viewing distance (NVD).
If this distance is maintained, two slightly divergent views are projected to the person’s eyes, both covering the entire
screen. With increasing deviations from the NVD the stereo image quality decreases. As a major drawback in usability,
the manufacturer so far assigns this distance.
We propose a software-based solution that corrects false view assignments depending on the distance of the viewer. Our
novel approach enables continuous view adaptation based on the calculation of intermediate views and a column-bycolumn
rendering method. The algorithm controls each individual subpixel and generates a new interleaving pattern from
selected views. In addition, we use color-coded test content to verify its efficacy.
This novel technology helps shifting the physically determined NVD to a user-defined distance thereby supporting
stereopsis. The recent viewing positions can fall in front or behind the NVD of the original setup. Our algorithm can be
applied to all multi-view autostereoscopic displays — independent of the ascent or the periodicity of the optical element.
In general, the viewing distance can be corrected with a factor of more than 2.5.
By creating a continuous viewing area the visualized 3D content is suitable even for persons with largely divergent
intraocular distance — adults and children alike — without any deficiency in spatial perception.
Thermal cameras are widely used in driver vision enhancement systems. However, in pathless terrain, driving becomes
challenging without having a stereoscopic perception. Stereoscopic imaging is a well-known technique already for a long
time with understood physical and physiological parameters. Recently, a commercial hype has been observed, especially
in display techniques. The commercial market is already flooded with systems based on goggle-aided 3D-viewing
techniques. However, their use is limited for military applications since goggles are not accepted by military users for
several reasons.
The proposed uncooled thermal imaging stereoscopic camera with a geometrical resolution of 640x480 pixel perfectly
fits to the autostereoscopic display with a 1280x768 pixels. An eye tracker detects the position of the observer's eyes and
computes the pixel positions for the left and the right eye. The pixels of the flat panel are located directly behind a
slanted lenticular screen and the computed thermal images are projected into the left and the right eye of the observer.
This allows a stereoscopic perception of the thermal image without any viewing aids. The complete system including
camera and display is ruggedized. The paper discusses the interface and performance requirements for the thermal
imager as well as for the display.
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