GB2305048A - Stereoscopic display - Google Patents

Stereoscopic display Download PDF

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Publication number
GB2305048A
GB2305048A GB9518135A GB9518135A GB2305048A GB 2305048 A GB2305048 A GB 2305048A GB 9518135 A GB9518135 A GB 9518135A GB 9518135 A GB9518135 A GB 9518135A GB 2305048 A GB2305048 A GB 2305048A
Authority
GB
United Kingdom
Prior art keywords
stereoscopic display
display
image
switching circuit
stereoscopic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9518135A
Other versions
GB9518135D0 (en
Inventor
Yoshiharu Chikazawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Technicolor SA
Original Assignee
Thomson Multimedia SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson Multimedia SA filed Critical Thomson Multimedia SA
Priority to GB9518135A priority Critical patent/GB2305048A/en
Publication of GB9518135D0 publication Critical patent/GB9518135D0/en
Publication of GB2305048A publication Critical patent/GB2305048A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/10Processing, recording or transmission of stereoscopic or multi-view image signals
    • H04N13/106Processing image signals
    • H04N13/161Encoding, multiplexing or demultiplexing different image signal components
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/20Image signal generators
    • H04N13/204Image signal generators using stereoscopic image cameras
    • H04N13/239Image signal generators using stereoscopic image cameras using two 2D image sensors having a relative position equal to or related to the interocular distance
    • 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
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/10Processing, recording or transmission of stereoscopic or multi-view image signals
    • H04N13/106Processing image signals
    • H04N13/167Synchronising or controlling image signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/20Image signal generators
    • H04N13/296Synchronisation thereof; Control thereof

Abstract

In a stereoscopic display using a lenticular lens sheet or parallel grid mask to create the stereoscopic effect the pixel switching frequency which switches between left and right image for alternating pixels in the horizontal scanning line is very high. To lower the switching frequency, which, in turn, makes the use of a much simpler switching circuit possible, the scanning direction S of the display 2 is set to vertical. Therefore, the switching from e.g. left to right image must be done at the end of the vertical scanning column only.

Description

STEREOSCOPIC DISPLAY AND STEREOSCOPIC DISPLAY SYSTEM The invention relates to a stereoscopic display and a stereoscopic display system with two cameras, in particular to a stereoscopic display having mixed stripe image.
Stereoscopic displays and stereoscopic display systems are known like, for example, a stereoscopic display using a lenticular lens sheet in front of the display. It is also known, e.g. by the article "Autostereoscopic 3D LCD Display using LCD-generated parallax Barrier", of H. Isono et al., Japan Display 1992, pp. 303-306, to realise a separation for left and right image by parallax barriers. These barriers can be arranged like a parallax barrier sheet.
In such a stereoscopic display the display comprises a pixel field, formed of rows and columns of pixels. The columns alternately contain information of a left and a right picture. To achieve the stereoscopic effect, the pixels in a horizontal scanning line alternate for example from right image to left image and so forth. This means, for example, the first pixel in the row is a pixel belonging to the right image, the second pixel in the row is a pixel belonging to the left image and so forth, so that a mixed stripe image formed by pixel columns is formed. This, in turn, means that in order to display such a mixed stripe images, a fast and complex pixelalternating circuit is needed, which is able to alternate left and right images for each pixel on a horizontal scanning line.Especially when the incoming video signal is a composite video signal, this pixel-alternating circuit is complex and difficult, because it is difficult to change each pixel's color by the color burst signal of the right and left images.
It is therefore the object of the invention to provide a stereoscopic display and a stereoscopic display system where the formation of the mixed stripe image is simplified.
This object is solved by the invention according to the independent claims.
According to the invention the scanning direction is changed from horizontal, or more generally, from a direction perpendicular to columns into vertical, or more generally, into direction of said columns.
This has the advantage, that the alternating frequency from the left image to the right image and vice versa is drastically reduced so that in a stereoscopic display system according to the invention the switching circuit no longer operates at a high speed with the result that a simpler and in consequence cheaper circuit can be used. In prior art systems such a circuit operates in a NTSC system at a switching frequency of more than 3.58 MHz, whereas in a system according to the invention under the assumption that this system uses the same frame rate and scanning line number the switching circuit of the invention must switch at a rate of less than 31.5 kHz.
Preferred embodiments of the invention are given in the dependent claims.
Preferred embodiments of the stereoscopic display and the stereoscopic display system will be now be described by way of examples with reference to the accompanying drawings, in which: Fig. 1 shows a first embodiment of stereoscopic display system according to the invention, Fig. 2 shows a second embodiment of a stereoscopic display system which can be used for video signals of an interlaced or a noninterlaced type, Fig. 3 shows the principle of the lenticular lens sheet method, Fig. 4 shows the principle of a mixed stripe image, and Fig. 5 shows a prior art stereoscopic display system.
First, the known principles of the stereoscopic display using a lenticular lens sheet with a mixed stripe image are explained with reference to Figures 3, 4, and 5.
In Fig. 3 a flat panel display 1 consists of a pixel plane 2 with the pixels 3 for left and pixels 4 for right image, wherein the pixels 3, 4 for left and right image are arranged alternately. In front of front glass 5 of the flat panel display 1 there is a lenticular lens sheet 6 arranged, so that right eye 7 sees only pixels 4 for the right image, whereas left eye 8 sees only pixels 3 for the left image. Seen from the front, as it is in Fig. 4, this display 1 gives a so-called mixed stripe image consisting of pixel colums R, L, wherein the pixel column R comprises pixels 4 with right image and column L comprises pixels 3 with left image.
Fig. 5 shows a prior art stereoscopic display system, consisting of a right camera 9 and a left camera 10, a switching circuit 11 and the display 1 with horizontal scanning lines, wherein a horizontal arrow S defines the scanning direction. To arrange the pixels in a mixed stripe image according to Fig. 4, the switching circuit 11 must switch for each pixel 3, 4 between the left and the right camera 10, 9. Therefore, the timing clock, which is input to the control input 12 of the switching circuit 11, has to be set at a frequency equal to the pixel frequency.
Fig. 1 shows a first embodiment of a stereoscopic display system according to the invention, wherein in contrast to the prior art systems the scanning is done in a vertical fashion shown by the vertical scanning arrow S. This, in turn, means that switching between the right camera 9 and the left camera 10 has to occur at the end of a scanning line only, which means at the end of a pixel column R or L, respectively. Therefore the switching frequency is as low as the scanning column frequency.
Fig. 2 shows a second embodiment of the stereoscopic display system as an experimental setup. Therein the video signal can be of an interlaced type (NTSC, PAL, SECAM, etc.) or a noninterlaced type. The two cameras 9, 10 and the display 1 are turned leftside down in this example so that the scanning direction S goes in vertical direction from bottom to top as shown by arrow S. The two cameras 9, 10 are synchronized e.g. by a GEN lock signal through synchronization input 13, i.e. the camera video signals are locked.
In the case of an interlaced video signal an appropriate field timing signal is supplied to the control input 12 of the switching circuit 11 so that the video signals are switched for each field. Therefore, the display 1 displays the image of the right camera 9 at the odd field and displays the image of the left camera 10 at the even field. In consequence the display 1 displays striped right and left images R, L. With this system, a switching circuit 11 only is needed which switches on the field-changing signal. Therefore, the switching speed is very low and the switching circuit 11 is in consequence very simple and cheap.
If the video signal is of a noninterlaced type a scanning timing signal is supplied to the control input 12 of the switching circuit so that the video signals are switched for every scanning line by the switching circuit 11.
Therefore the display 1 displays in the case of a noninterlaced video signal the image of the right camera 9 at the odd scanning line and displays the image of the left camera 10 at the even scanning line, so that the display 1 displays striped right and left images. Because the switching has to be done at the end of the scanning line only, the switching speed is low and the switching circuit 11 is simple and cheap.
For both types of video signals it is of course possible to use the even scanning line for the right image and the odd scanning line for the left image. And it is possible to change the scanning direction S to the opposite direction, which can be achieved e.g. by turning the two cameras 9, 10 and the display 1 right side down.

Claims (9)

CLAIMS:
1. Stereoscopic display (1) with a pixel plane (2) comprising rows and columns, so that one column (L) depicts a left image and the neighbouring column (R) a right image and so forth forming a mixed stripe image, characterized in that the scanning direction (S) is set in direction of said columns.
2. Stereoscopic display (1) according to claim 1 wherein the display (1) is a flat panel display.
3. Stereoscopic display (1) according to claim 1 or 2, wherein a lenticular lenses (6) and/or parallax barriers are arranged in front of the display (1).
4. Stereoscopic display (1) according to claim 1, wherein the vertical scanning direction (S) goes from top to bottom.
5. Stereoscopic display (1) according to claim 1, wherein the vertical scanning direction (S) goes from bottom to top.
6. Stereoscopic display system comprising two cameras (9, 10) for the right and left image, a switching circuit { 11) and a stereoscopic display (1) according to one of the claims 1 to 5.
7. Stereoscopic display system according to claim 6, characterized in that the two cameras (9, 10) are synchronized with a lock signal.
8. Stereoscopic display system according to claim 7, wherein the switching circuit (11) is controlled by a field timing signal in the case of an interlaced video signal.
9. Stereoscopic display system according to claim 7, wherein the switching circuit (11) is controlled by a scanning timing signal in the case of a noninterlaced video signal.
GB9518135A 1995-09-06 1995-09-06 Stereoscopic display Withdrawn GB2305048A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9518135A GB2305048A (en) 1995-09-06 1995-09-06 Stereoscopic display

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9518135A GB2305048A (en) 1995-09-06 1995-09-06 Stereoscopic display

Publications (2)

Publication Number Publication Date
GB9518135D0 GB9518135D0 (en) 1995-11-08
GB2305048A true GB2305048A (en) 1997-03-26

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB9518135A Withdrawn GB2305048A (en) 1995-09-06 1995-09-06 Stereoscopic display

Country Status (1)

Country Link
GB (1) GB2305048A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2146543A1 (en) * 1998-06-30 2000-08-01 Univ Madrid Politecnica Stereoscopic video camera
GB2422737A (en) * 2005-01-26 2006-08-02 Sharp Kk Multiple-view display and display controller

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB413894A (en) * 1933-09-13 1934-07-26 Radio Corporated Improvements in or relating to television systems
GB472562A (en) * 1936-07-02 1937-09-27 Eisler Paul Improvements in or relating to stereoscopic television cinematograph and like systems
EP0226115A2 (en) * 1985-12-09 1987-06-24 G.B. Kirby Meacham A system for projecting three-dimensional images
GB2185825A (en) * 1986-01-23 1987-07-29 John Charles Sanderson Spatial stereoscopic image system using concave mirror
EP0570806A2 (en) * 1992-05-19 1993-11-24 Eastman Kodak Company Method and apparatus for optimizing depth images by adjusting print spacing

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB413894A (en) * 1933-09-13 1934-07-26 Radio Corporated Improvements in or relating to television systems
GB472562A (en) * 1936-07-02 1937-09-27 Eisler Paul Improvements in or relating to stereoscopic television cinematograph and like systems
EP0226115A2 (en) * 1985-12-09 1987-06-24 G.B. Kirby Meacham A system for projecting three-dimensional images
GB2185825A (en) * 1986-01-23 1987-07-29 John Charles Sanderson Spatial stereoscopic image system using concave mirror
EP0570806A2 (en) * 1992-05-19 1993-11-24 Eastman Kodak Company Method and apparatus for optimizing depth images by adjusting print spacing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2146543A1 (en) * 1998-06-30 2000-08-01 Univ Madrid Politecnica Stereoscopic video camera
GB2422737A (en) * 2005-01-26 2006-08-02 Sharp Kk Multiple-view display and display controller
US8144079B2 (en) 2005-01-26 2012-03-27 Sharp Kabushiki Kaisha Multiple-viewer multiple-view display and display controller

Also Published As

Publication number Publication date
GB9518135D0 (en) 1995-11-08

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