WO2011151044A2 - Method and arrangement for three-dimensional representation - Google Patents

Method and arrangement for three-dimensional representation Download PDF

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Publication number
WO2011151044A2
WO2011151044A2 PCT/EP2011/002654 EP2011002654W WO2011151044A2 WO 2011151044 A2 WO2011151044 A2 WO 2011151044A2 EP 2011002654 W EP2011002654 W EP 2011002654W WO 2011151044 A2 WO2011151044 A2 WO 2011151044A2
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Prior art keywords
projection
time
projection screen
means
partial
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PCT/EP2011/002654
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German (de)
French (fr)
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WO2011151044A3 (en )
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Markus Klippstein
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Visumotion Gmbh
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30Image reproducers
    • H04N13/302Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays
    • H04N13/31Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays using parallax barriers
    • H04N13/312Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays using parallax barriers the parallax barriers being placed behind the display panel, e.g. between backlight and spatial light modulator [SLM]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30Image reproducers
    • H04N13/302Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays
    • H04N13/305Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays using lenticular lenses, e.g. arrangements of cylindrical lenses

Abstract

The invention relates to a method and arrangement for three-dimensional representation. The method comprises the following steps: Front or back projection of at least two views A (k) where k=1..n and n>1 onto a projection screen (1) in a chronologically sequential succession and in a defined resolution of pixels x (i, j) in lines i and columns j, chronologically sequential partial shading of each pixel x (i, j) on the projection screen (1) such that at any time (t) precisely one sub-surface T (k, i, j) of each pixel x (i, j) is visible, wherein during the projection of any fixed view A (k) the same sub-surface T (k, i, j) of a pixel x (i, j) always remains visible and the sub-surfaces T (k, i, j) where k=1..n for fixed pairs (i, j) and different k do not overlap on the projection screen (1), and displaying the sub-surfaces T (k, i, j) in at least n directions, so that from at least one viewing position a viewer sees at least some image information of various views with both eyes, whereby a three-dimensional perception is generated. A special embodiment relates to a high-resolution 2D representation.

Description

Method and arrangement for the spatial representation

The invention relates to the field of three-dimensional representation, especially the spatially perceptible without auxiliary display for multiple viewers simultaneously, the so-called auto-stereoscopic visualization.

For some time approaches exist on the above field. A pioneer in this field was Frederic Ives, of a system with a "line screen" presented in Scripture GB1904-18672 to 3D representation. Further, in the writing of Sam H. Kaplan "Theory of parallax barriers", Journal of SMPTE 59 , No 7, pp 11- 21, July 1952 basic findings on the use of barrier screens for 3D display described.

However, long time succeeded in widespread use were autostereoscopic systems. Only in the 80 years of the 20th century a renaissance of 3D systems was able to use due to the now-available computing power and novel display technologies. In the 90 years the number of patent applications and publications soared to glasses-free 3D visualizations literally in the air. Outstanding results were achieved by the following inventors or suppliers:

In JP 8-331605 Ikeda Takashi et al describes. (Sanyo) a step barrier in which comprises a transparent barrier element has approximately the size of a colored subpixel (R, G or B). With this technique, it was possible, the most autostereoscopic systems due to the simultaneous display of several (at least two, preferably more than two views) partially convert lay loss of resolution occurs in the horizontal direction and the vertical direction. The disadvantage here, as with all barrier methods of high light loss. In addition, the stereo contrast changes in lateral movement of the observer of almost 100% to about 50% and then again rising to 100%, resulting in a fluctuating in viewing space 3D image quality. Pierre Allio succeeded with the teaching of US 5,808,599, US 5,936,607 and WO 00/10332 a remarkable advancement of lenticular technology, in which he also uses a subpixelbasierte view layout. Another outstanding R & D result was registered with the EP 0791 847 EP patent by Cees van Berkel (Philips). Here are relative to the vertical lenticular lenses inclined on a display that also shows different perspective views. N characteristic views on at least two display lines are divided here, so that, again, the loss of resolution is partially folded from the horizontal to the vertical.

Several milestones for the Autostereoscopy founded Jesse Eichenlaub with the documents US 6, and WO 02/35277 157.424 and several other inventions, but are almost all 3D systems for only one viewer and / or often can not be produced at acceptable cost.

With DE 10003326 C2 Armin Grasnick et al succeeded. 4D vision in advancing the barrier technology in terms of two-dimensional structured wavelength selective filter arrays for creating a 3D impression. However, a disadvantage here is opposite to a 2D display greatly reduced brightness of such 3D systems.

Armin Schwerdtner (Seereal Technologies) managed by WO 2005/027534 a new technological approach for all (usually two) views fully-resolution 3-D representation. However, this approach is associated with high adjustment effort and for larger screen sizes only extremely difficult to implement (from about 25 inches).

Finally Wolfgang Tzschoppe et al reported. (X3D Technologies), WO 2004/077839 A1, which relates to an improved in brightness barrier technology. Based on the approach of a stepped barrier of JP 08-331605 and DE 10003326 a particular duty cycle of the transparent will be presented to the opaque barrier filter elements here, which is greater than 1 / n with n the number of views displayed. However, the disclosed in this document configurations and gauges generate a greatly limited depth perception in most cases because the stereo contrast -verglichen about the teaching of JP 08-331605- is greatly reduced.

The invention has for its object a possibility for autostereoscopic display to create in order to achieve improved visibility for the same number of viewers. Under improved visibility is particularly, but not exclusively, to an improved resolution at the same time the highest possible stereo channel separation to understand. Corresponding methods and arrangements are to be industrially feasible and at the same time without the need of 3D glasses offer several viewers a spatial image. Furthermore, a method for a very high resolution two-dimensional representation to be provided.

This object is inventively achieved by a method for three-dimensional representation, comprising the steps of

- front or back projecting at least two views A (k) with k = 1..n and n> 1 on a projection screen in time-sequential order and in a defined resolution of pixels x (i, j) in row i and column j .

temporally sequential, partial shading of each picture element x (i, j) on the projection screen, so that x of each pixel (i, j) at each time point t in each case exactly one partial area T (k, i, j) is visible, wherein, in the projection of an arbitrary but fixed view a (k) is always the same surface portion T (k, i, j) of a pixel x (i, j) remains visible and the part surfaces T (k, i, j) with k =. 1 do not overlap .n solid pairs (i, j) and k different on the projection screen,

- T so that an observer with both eyes, at least partially provides mapping of the surface portions (k, i, j) in n directions at least from at least one viewing position image information of different views, so that a spatial perception. Preferably, the time-sequential, partial shading is implemented by a flat light valve such as a liquid crystal Hutter, which is located in the immediate vicinity of the projection screen and that the projected light (sequentially in time and in synchronization with the projection of the views A (k) only to sub-areas T k, i, j) can pass.

In other words, the invention first utilizes the fact that some reflective imager projection technology are particularly fast, such as DMDs or fLCOS- chips or similar. By virtue of such a fast reflective imager is projected in the first variant of the back on a projection screen sequentially in a series of at least two views A (k). According to the invention, a shutter or similar optical device is now arranged in front of or behind the projection screen, which only leaves per pixel (in this case, full-color per pixel) a portion visible. That leaves at any time the full resolution five visible, but the pixel no longer have the full fill factor on.

Alternatively, the time-sequential, partial shading can be realized by an opto-mechanical system, for example a rotating surface with a reflective surface that at least partially with an opaque pattern

ID is provided, which the projected light only to part surfaces T (k, i, j) maps sequentially in time and in synchronization with the projection of the views A (k). Such a rotating surface, the function of a color wheel still the same (as with DLP projectors usual), so the Aufmodulation of color take over. Furthermore, such an opto-mechanical system can be useful in two parts

form 15: Then, for example, a mirror wheel would modulate the color and ensure that the other mirror wheel due to the opaque pattern of the patch image. Both mirrors wheels must not necessarily operate at the same rotational frequency. 0 The figure of the surface portions (k, i, j) in at least n directions, for example by means of a lenticular screen, a lenticular screen, a parallax barrier, a holographic optical element (HOE), a prism raster, a structured surface and / or a diffraction pattern carried out T , Other configurations are possible.

5 Alternatively, it is possible that the mapping of partial areas T (k, i, j) is at least in n directions by means of a dynamic look, for example, a time-varying lens raster is performed. Of course, then a suitable synchronization with the various state modes of the lens array with the illustrated respectively per unit time views A (k) must be ensured.

D

The object of the invention is also achieved by an arrangement for the spatial representation comprising

- a projection unit for the front or rear projecting at least two views A (k) with k = 1..n and n> 1 on a projection screen in time-sequential order and in a defined resolution of pixels x (i, j) in row i and column j,

Means for temporally sequential, partial shading of each picture element x (i, j) on the projection screen, so that x of each pixel (i, j) at each time point t in each case exactly one partial area T (k, i, j) is visible, wherein when projecting an arbitrary but fixed view a (k) is always the same surface portion T (k, i, j) of a pixel x (i, j) remains visible and the part surfaces T (k, i, j) with k is = 1..n solid pairs (i, j) and k different on the screen do not overlap,

- means for mapping the surface portions T, so that an observer with both eyes, at least partially provides image information of different views (k, i, j) in n directions at least from at least one viewing position, so that a spatial perception.

The partial surfaces T (i, j) [but not T (k, i, j)] to some extent correspond to pixels, which are divided into k portions, and reflect which successively k time of the different sections image information of different views A (k).

The means for temporally sequential, partial shadowing consist of a flat light valve such as a liquid crystal Hutter, which is located in the immediate vicinity of the projection screen and that the projected light (sequentially in time and in synchronization with the projection of the views A (k) only to sub-areas T k, i, j) can pass.

Optionally, the light coming from projection screen must be depolarized light or unpolarized are generated, to the shutter happen.

Alternatively, the means for temporally sequential, partial shading can be made of an opto-mechanical system, for example a rotating surface with a reflective surface that is at least partially provided with an opaque pattern which sequentially in time and in synchronization (with the projection of the views A k) k, i, j) imaging the projected light only to part surfaces T (. Such a rotating surface, the function of a color wheel still the same (as with DLP projectors usual), so the Aufmodulation of color take over. Furthermore, it may be useful to train such opto-mechanical system in two parts: Then for example, a mirror wheel would modulate the color and ensure that the other mirror wheel due to the opaque pattern, the patch image. Both mirrors wheels must not necessarily operate at the same rotational frequency.

5

The means for imaging the surface portions T (k, i, j) in at least n directions consist for example of a lenticular screen, a lenticular screen, a parallax barrier, a holographic optical element (HOE), a prism raster, a structured surface and / or a diffraction pattern , The ID period widths of the above-mentioned optical elements can come from the pixel width of a surface portion T (i, j) up to a multiple width of a partial area (i, j) in question.

In particular embodiments, the means for imaging the part surfaces can 15 T (k, i, j) in at least n directions consist of a dynamic look, for example a time-varying lens frame. Of course, then a suitable synchronization with the various state modes of the lens array with the illustrated respectively per unit time views A (k) must be ensured. D Advantageously, the projection beam path can be folded by the projection unit to the screen. Particularly advantageous in this case the means for folding the beam path bear at least partially on the operation of means for temporally sequential, partial shading and / or for operation of the means for imaging the surface portions T (k, i, j) in at least n directions at.

5, the flat configuration of a screen based on the projection is possible for example using the teaching of WO9953375 or WO0163356.

The projection screen may be a front projection screen in particular embodiments, which glows for a few milliseconds. Hierzu0 example could be a time-delayed (eg afterglow) screen used so that the views are emitted each in different directions, ie from which they come. In the representation of a sufficient number, for example 30, views A (k) can be reduced unpleasant transitions of the views A (k) for head movement of the viewer. Finally, the application of the inventive concept also provides another arrangement for high-resolution two-dimensional display, comprising

once a projection unit for the front or rear projecting at least two pairs of disjoint subsets A (k) and the same image with k = 1..n and n> 1 on a projection screen in time-sequential order and in a defined resolution of pixels x (i , j) in row i and

J columns,

Means for temporally sequential, partial shading of each picture element x (i, j) on the projection screen, so that x of each pixel (i, j) at each time point t in each case exactly one partial area T (k, i, j) is visible, wherein always the same with the projection of an arbitrary but fixed subset a (k)

Partial area T (k, i, j) of a pixel x (i, j) remains visible and the part surfaces T (k, i, j) with k = 1..n solid pairs (i, j) and different k do not overlap the projection screen,

so that A (k) of the image are temporally sequentially visible to an observer all pairwise disjoint subsets, and thereby a high-resolution

2-D image is displayed.

The subsets A (k) replace the views in this regard. the subsets are advantageous respectively turned from strip and the same view AO composed, in each case, for example, every n-th columns of a view AO, are taken beginning with the k-th column, in each case a subset of A (k).

The invention will be described in greater detail with reference to embodiments. In the drawings:

Fig. 1 shows the schematic setup for implementing the invention

process

Fig. 2 and Fig. 3 respectively the schematic structure in the inventive method at two different points in time, and FIG. 4 is a scheme for forming an opto-mechanical system for use in the inventive method.

All drawings are not to scale. This applies particularly to 5 degree angle, if any.

First, therefore, Figure 1 shows the schematic setup for implementing the method.

The exemplary illustrated method of the invention for the spatial representation

ID comprises the steps of

Back projecting two views A (k) with k = 1 ..2 from a projector 3 onto a projection screen 1 in time-sequential order and in a defined resolution of pixels x (i, j) in row i and column j, - time-sequential , partial shading of each picture element x (i, j) on the

15 projection screen 1 so that x of each pixel (i, j) at each time point t in each case exactly one partial area T (k, i, j) is visible, wherein, in the projection of an arbitrary but fixed View A (k) is always the same surface portion T (k, i, j) of a pixel x (i, j) remains visible and the part surfaces T (k, i, j) with k = 1 ..n solid pairs (i, j) and different k on the projection screen 1

ZD not overlap,

Mapping the sub-areas provides T (k, i, j), so that a viewer 5 with both eyes L and R at least partly in at least 2 directions from at least one viewing position image information of different views A (1) and A (2), so that a spatial perception is created.

25

The temporally sequential, partial shading is realized here by means of a flat light valve 2, for example a liquid crystal Hutter, which is located in the immediate vicinity of the screen 1 and which sequentially in time and in synchronization with the projection of the views A (k) the 30 projected light only to partial surfaces can happen T (k, i, j).

The figure of partial areas T (k, i, j) in at least n = 2 directions is performed, for example by means of a lenticular screen. 4 Other configurations are possible. In Fig. 2 and Fig. 3 shows the schematic structure in the inventive method is shown at two different time points, respectively. The circled number "1" and "2" indicates respectively that the view 1 and 2 are again in full resolution at the respective time of the projector. 3 Accordingly, the light valve 2 is in

5 as connected in its columns that in each case one half of a partial area T (i, j) transparent, and the other is opaque. Thereby, on the screen 1, only a corresponding part of the surface portions T (i, j), and therefore the partial surfaces T (1, i, j) and T (2 i, j) with image information of the views A (1) or . A (2) acted upon. About the picture by means of the lenticular lenses 4 is thus ensured that the

I0 view A (1) only the left eye L and the view A (2) reaches only the right eye R. The inventive method and so to speak, the drawings may be modified with k = 1..n and for n> 2 views A (k).

Finally Fig. 4 shows a scheme for forming an opto-mechanical

15 system 6 for use in the inventive method. Here, the time-sequential, partial shading in place of a light valve can be realized 2 through an opto-mechanical system 6, for example a rotating surface with a specular surface that is at least partially provided with an opaque pattern which sequentially in time and in synchronization with der0 projection of the views A (k) (k, i, j) imaging the projected light only in partial areas T. Such a rotating surface 6 can simultaneously function as a color wheel yet (as with DLP projectors usual), so the Aufmodulation of color, do not assume, as in Figure 4 by the letters R, G, B (Red, Green and Blue) indicated. This is achieved by the use of color (R, G, B) reflektierenden5 mirrors or surfaces. At the same time as described above also, the opaque pattern is present, as indicated in Figure 4 at the lower portion of the red-reflecting surface on the Farbspiegelrad. 6 The pattern provides the appropriate partial shading in the front-described sense. The Farbspiegelrad rotates at a timing of the image of the views A (k) synchronenD speed so that each view A (k) is projected in true color.

The drawings can also be used for the illustration of the inventive arrangements accordingly. Figure 1 would then accordingly understood as an arrangement for three-dimensional display, comprising - a projection unit 3 to the front or rear projecting at least two views A (k) with k = 1..n and n> 1 on a projection screen 1 in a time-sequential sequence and x in a defined resolution of picture elements (i, j) in row i and column j,

Means 2 for temporally sequential, partial shading of each picture element x (i, j) on the screen 1 so that x of each pixel (i, j) at each time point t in each case exactly one partial area T (k, i, j) is visible, wherein when projecting an arbitrary but fixed view a (k) is always the same surface portion T (k, i, j) of a pixel x (i, j) remains visible and the part surfaces T (k, i, j) with k =. 1 .n solid pairs (ij) and different k do not overlap on the screen 1,

Means 4 for imaging of the surface portions (k, i, j) so that 5 at least partially provides T in at least directions of n from at least one viewing position, a viewer with two eyes image information of different views, so that a spatial perception.

To avoid repetition, it is omitted here to the appropriate presentation to the other drawings.

The advantages of the invention are versatile: in particular, a resolution of the SD image, and a good brightness becomes possible. Henceforth need not be moved to the imager of the projection system (Imager as DMD or LCOS), and there are, apart from a possible color wheel also generally no moving components are present.

Claims

claims
1. A method for three-dimensional representation, comprising the steps of
- front or back projecting at least two views A (k) with k = 1..n 5 and n> 1 on a projection screen (1) in time-sequential
Sequence and x in a defined resolution of picture elements (i, j) in row i and column j,
- temporally sequential, partial shading of each picture element x (i, j) on the projection screen (1) so that x of each pixel (i, j) to each
I0 at time t in each case exactly one partial area T (k, i, j) is visible, wherein, in the
Projection of an arbitrary but fixed View A (k) is always the same surface portion T (k, i, j) of a pixel x (i, j) remains visible and the part surfaces T (k, i, j) with k = 1..n for solid pairs (i, j) and k different on the projection screen (1) do not overlap,
15 - T so that an observer with both eyes, at least partially provides mapping of the surface portions (k, i, j) in n directions at least from at least one viewing position image information of different views, so that a spatial perception. 0 2. A method according to claim 1, characterized in that the temporally sequential, partial shading is implemented by a flat light valve such as a liquid crystal Hutter, which is located in the immediate vicinity of the projection screen (1) and which sequentially in time and in synchronization with the projection the views A (k) only to sub-areas T can be projected Licht5 (k, i, j) happen.
3. The method according to claim 1, characterized in that the temporally sequential, partial shading is realized by an opto-mechanical system (6), for example a rotating surface with a spiegelnden0 surface that is at least partially provided with an opaque pattern which temporally sequentially and A (k) maps the projected light only to part surfaces T (k, i, j) in synchronization with the projection of the views. Method according to one of the preceding claims, characterized in that the mapping of partial areas T (k, i, j), in at least n directions by means of a lenticular screen, a lenticular screen, a parallax barrier, a holographic optical element (HOE), a prism grid a structured surface and / or a diffraction pattern is conducted.
A method according to any one of claims 1 to 3, characterized in that the mapping of partial areas T (k, i, j) is at least in n directions by means of a dynamic look, for example, a time-varying lens raster is performed.
An arrangement for three-dimensional display, comprising
- a projection unit (3) for front or rear projecting at least two views A (k) with k = 1..n and n> 1 on a projection screen (1) in time-sequential order and in a defined resolution of pixels x (i , j) in row i and column j,
Means (2) in each case at exactly the temporally sequential, partial shading of each picture element x (i, j) on the projection screen (1) so that x of each pixel (i, j) at each time t a partial area T (k, i, j) is visible, in which (in the projection of an arbitrary but fixed view a k) is always the same surface portion (k, i, j) of a pixel x (i, j) remains visible T and the partial surfaces T (k, i , j) with k = 1..n (for solid pairs i, j) and different k do not overlap on the projection screen (1),
Means (4) (k, i, j), so that looks T for imaging of the surface portions in at least n directions from at least one viewing position, a viewer (5) with both eyes at least partly image information of different views, so that a spatial perception.
is arrangement according to claim 6, characterized in that the means (2) for temporally sequential, partial shadowing consist of a flat light valve such as a liquid crystal Hutter, which is located in the immediate vicinity of the projection screen (1) and which sequentially in time and in synchronization with the projection of the views A (k) only to sub-areas T can be the projected light (k, i, j) happen.
8. An arrangement according to claim 6, characterized in that the means (2) consist of an opto-mechanical system for temporally sequential, partial shading (6), for example a rotating surface with a 5 specular surface that is at least partially with an opaque pattern is provided which images sequentially in time, and the projected light only in synchronization with the projection of the views A (k) in partial areas T (k, i, j).
ID 9. An arrangement according to one of claims 6 to 8, characterized in that the means (4) for imaging the part surfaces T (k, i, j) in at least n directions consist of a lenticular screen, a lenticular screen, a parallax barrier, a holographically -optical element (HOE), a prism raster, a structured surface and / or a
15 diffraction pattern.
10. An arrangement according to one of claims 6 to 8, characterized in that the means (4) for imaging of the surface portions (k, i, j) in at least n directions consist T from a dynamic optics, for example a time-veränderlichenG lenticular.
1 1. Arrangement according to one of claims 6 to 10, characterized in that the projection beam path is folded by the projection unit (3) to the projection screen (1).
5
12. An arrangement according to claim 1 1, characterized in that the means for folding the beam path at least partially to the action of the means (2) and / or the means (4) contribute. D 13. An arrangement according to one of claims 6 to 10, characterized in that the projection screen (1) is a front projection screen, which glows for a few milliseconds.
14. An arrangement for high-resolution two-dimensional representation, comprising: - A (k) once a projection unit (3) for front or rear projecting at least two pairs of disjoint subsets and the same image with k = 1..n and n> 1 on a projection screen ( 1) in time-sequential order and in a defined resolution of pixels x (i, j) in row i and column j,
Means (2) in each case at exactly the temporally sequential, partial shading of each picture element x (i, j) on the projection screen (1) so that x of each pixel (i, j) at each time t a partial area T (k, i, j) visible, where a (k) is always the same surface portion T (k, i, j) of a pixel x (i, j) remains visible during the projection of an arbitrary but fixed subset and the partial surfaces T (k, i , j) with k = 1..n (for solid pairs i, j) and different k do not overlap on the projection screen (1),
so that time-sequentially to a viewer (5) all pairwise disjoint subsets A (k) of the image are visible and thereby a high-resolution 2D image is displayed.
PCT/EP2011/002654 2010-06-01 2011-05-30 Method and arrangement for three-dimensional representation WO2011151044A3 (en)

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