WO2012107152A1 - Étalonnage des couleurs d'un système d'affichage tridimensionnel comprenant un dispositif d'affichage tridimensionnel et des lunettes tridimensionnelles - Google Patents

Étalonnage des couleurs d'un système d'affichage tridimensionnel comprenant un dispositif d'affichage tridimensionnel et des lunettes tridimensionnelles Download PDF

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Publication number
WO2012107152A1
WO2012107152A1 PCT/EP2011/074325 EP2011074325W WO2012107152A1 WO 2012107152 A1 WO2012107152 A1 WO 2012107152A1 EP 2011074325 W EP2011074325 W EP 2011074325W WO 2012107152 A1 WO2012107152 A1 WO 2012107152A1
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WO
WIPO (PCT)
Prior art keywords
glasses
display
color
new
image data
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Ceased
Application number
PCT/EP2011/074325
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English (en)
Inventor
Patrick Morvan
Jean-Jacques Sacre
Jürgen Stauder
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Thomson Licensing SAS
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Thomson Licensing SAS
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/324—Colour aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
    • H04N13/337—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] using polarisation multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
    • H04N13/341—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] using temporal multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2213/00—Details of stereoscopic systems
    • H04N2213/008—Aspects relating to glasses for viewing stereoscopic images

Definitions

  • the invention relates to the color calibration of a 3D display system comprising a 3D display device and 3D glasses having specific spectral transmission characteristics.
  • 3D images of a 3D video content are generally transmitted to a terminal as source device dependent color image data representing these 3D images.
  • the model of these source device dependent color image data is generally specific to a transmission standard.
  • 3D images of this 3D video content are generally displayed on a display panel by controlling this display panel using destination device dependent color image data representing these 3D images.
  • the model of these destination device dependent color image data is specific to the type of display panel that is used, and notably to the primary spectra of this display panel.
  • the source device dependent color image data should then be transformed, i.e. corrected, into destination device dependent color image data, by using a specific color transform.
  • a color transformation or correction corresponds to the color calibration of the display panel.
  • color transformation or color correction processes are generally based on a workflow having the general frame shown in figure 2.
  • a source model performs a forward color transform, i.e. converts source device dependent color image data, e.g. received RGB values, into device independent color data, e.g. tristimulus XYZ values and a destination model performs an inverse color transform, i.e. converts device independent color data into destination device dependent color image data, i.e. calibrated RGB values.
  • Device dependent color image data of a 3D TV video content are generally prepared and transmitted to a 3D terminal according to usual standards. This standard defines a source model for the source device dependent color image data. In regular HD TV applications, source model can be described by parameters as defined in a standard REC-709.
  • source model is defined by a source chromaticity table with the following parameters:
  • the display device is generally a 3D TV set.
  • the destination model corresponds generally to a specific display panel, as to a specific LCD, PDP or projector.
  • the destination model is defined by a destination chromaticity table with the following parameters:
  • the destination chromaticity table defines a destination model for the destination device dependent color image data, i.e. for the calibrated RGB values.
  • Device independent color data e.g. tristimulus XYZ or xyz values, are generally obtained with a spectrophotometer.
  • a device independent 3x3 matrix color transform Ms can be calculated.
  • a destination chromaticity table another device independent 3x3 matrix color transform Md _1 can be calculated.
  • the calculation of these matrix Ms and Md _1 are for instance performed with the SMPTE RP177 computation method. This method is notably disclosed in "Derivation of Basic Television Color Equations", as published by SMPTE on January 1 , 1993.
  • the workflow of figure 2 can be then refined according to the workflow of figure 3 and as follows.
  • a source Tone Response Curve (TRCs) table can be calculated to get linear RGB values from the RGBs values received by the 3D terminal. This operation corresponds to a gammatization.
  • matrix color transform Ms is applied to the linear RGB values to get device independent color data, e.g. tristimulus XYZ values.
  • matrix color transform Md _1 is applied to the tristimulus XYZ values to get other linear RGB values.
  • a destination Tone Response Curve (TRCd) table can be calculated, the inverse of which (TRCd -1 ) is applied to the other linear RGB values to get final RGBd values to control the display panel in order to display the received 3D video content.
  • TRCd Tone Response Curve
  • the concatenation of the source gammatization (TRCs), the device independent 3x3 matrix color transform Ms, the device independent 3x3 matrix color transform Md _1 , and the source degammatization (TRCd -1 ) forms the above mentioned color transform or color correction which transforms the source device dependent color image data into destination device dependent color image data.
  • TRCs source gammatization
  • TRCd -1 source degammatization
  • 3D shutter glasses generally comprise transmission means that able to communicate with a communication module of the 3D TV set at least to synchronize their shuttering means with the frames that are displayed on the display panel of the TV set.
  • Such transmission means generally uses infra-red or wireless link.
  • Such a link may also be used for purpose different from the synchronization, as to detect whether the 3D glasses are actually worn by a user, as disclosed in the document US201 1 -012896, where a "wireless communication module 198 transmits data to and receives data from the 3D glasses 195".
  • the invention proposes to perform an automatic and accurate dynamic color correction on color image data representing 3D images to display on a 3D display panel, based on the spectral transfer function characterizing these 3D glasses.
  • the spectral transfer function of these 3D glasses is transmitted to a 3D terminal, for instance to a display device or to a set top box connected to a display device.
  • the 3D terminal then computes the color correction to be applied in real time on the color image data, e.g. RGB color components. These RGB color components represents the 3D images to display, as received by the 3D terminal.
  • a new color correction is calculated taking into account a new spectral transfer function characterizing these new 3D glasses.
  • this new spectral transfer function is transmitted to the 3D terminal.
  • This new color correction is then applied automatically in real time on these RGB color components in order to compensate for the color degradation specific to this new 3D glasses model.
  • New destination device dependent color image data representing the 3D images to display are then obtained in order to control the display panel such as to display these 3D images.
  • the subject of the invention is a method for displaying 3D images of a 3D video content by controlling a display panel using destination device dependent color image data, in order to view said 3D images through 3D glasses having specific spectral transfer function,
  • source device dependent color image data representing said 3D images of said 3D video content are received by a 3D terminal and are transformed by a color transform into said destination device dependent color image data for the control of said display panel
  • said method comprising the steps of:
  • the method comprises a step of transmitting the spectral transfer function from said detected new 3D glasses to said 3D terminal.
  • the method comprises a step of transmitting a code specific to said detected new 3D glasses from said detected new 3D glasses to said 3D terminal and a step of extracting stored spectral transfer function corresponding to said transmitted code for the computing step.
  • the main advantage of this invention is the automatic and dynamic color correction of the 3D glass color degradation. There is no user contribution contrary to the solution described in the above quoted document PCT/US 10/002304. Furthermore the system is more accurate as it uses a spectral degradation model for glasses. In final, a two components calibrated equipment, combining a display panel and 3D glasses, is obtained and a better visual comfort is provided for the viewer.
  • the specific spectral transfer function of the detected 3D glasses is their transmission spectrum G ⁇ X).
  • the computing of a new color transform uses also display primary spectra characterizing said display panel.
  • the computing of a new color transform is made spectrally, based on the glasses transmission spectrum G ⁇ X) and on the display primary spectra ⁇ ( ⁇ ).
  • this computing is performed according to the equations 1 and 2 as defined below.
  • the subject of the invention is also a 3D display system for displaying 3D images of a 3D video content comprising:
  • 3D display device comprising a receiver and a 3D display panel controlled by destination color image data and characterized by display primary spectra ⁇ ( ⁇ ) stored in a display memory of said 3D display device,
  • glasses transmission spectrum G ⁇ X stored in a glasses memory of said glasses and comprising transmission means able to communicate with the receiver of said 3D display device
  • the 3D terminal comprises :
  • - color transform means adapted to apply a color transform adapted to transform source color image data into destination color image data
  • - color transform computing means adapted to calculate said color transform using said glasses transmission spectrum and using display primary spectra stored in the display memory.
  • the terminal and the display device are the same apparatus.
  • the terminal is a set top box that is connected with the display device by a video-data-and-metadata link.
  • FIG. 1 illustrates the transmission spectrum of a set of 3D glasses
  • FIG. 3 already quoted, illustrates a refined workflow of figure 2 including explicitly gammatization and degammatization operations
  • FIG. 4 shows the workflow of figure 3 with the introduction of a dynamic color transform for the compensation of color degradation due to 3D new glasses, according to the invention
  • FIG. 5 illustrates schematically the calculation of the tristimulus values XYZ using display primary spectrum ⁇ ( ⁇ ) characterizing the display panel of the 3D display system according to the invention, and using transmission spectral data characterizing the 3D glasses G ⁇ X) of this 3D display system;
  • FIG. 6 illustrates a first example of 3D display system according to the invention where the terminal and the 3D display device are the same apparatus;
  • FIG. 7 illustrates a second example of 3D display system according to the invention where the terminal is a set top box separated from the 3D display device.
  • the 3D display system for displaying 3D images of a 3D video content comprises:
  • 3D display device comprising a receiver and a 3D display panel controlled by destination color image data and characterized by display primary spectra ⁇ ( ⁇ ) stored in a display memory of the 3D display device
  • glasses transmission spectrum G(k) comprising a glasses memory and transmission means able to communicate with the receiver of the 3D display device.
  • the 3D terminal comprises also:
  • - color transform computing means adapted to calculate this color transform using glasses transmission spectrum transmitted to the terminal by the transmission means, and using display primary spectra Dr(X), Dg(k), Db(X) stored in the display memory.
  • processor The functions of the color transform means and of the color transform computing means may be provided through the use of dedicated hardware as well as hardware capable of executing software in association with appropriate software.
  • processor should not be construed to refer exclusively to hardware capable of executing software, and may implicitly include, without limitation, digital signal processor (“DSP”) hardware, read-only memory (“ROM”) for storing software, random access memory (“RAM”), and non-volatile storage.
  • DSP digital signal processor
  • ROM read-only memory
  • RAM random access memory
  • non-volatile storage non-volatile storage.
  • the invention proposes to include the color degradation or color change due to the 3D glasses in an automatic color management system as described below.
  • the 3D glasses of the 3D TV system comprise a glasses memory storing the spectral transmission data of these glasses, i.e. their transmission spectrum.
  • the invention Before the transmission or the extraction of the glasses transmission spectrum of new 3D glasses, the invention requires detecting a 3D glasses change. Two non limiting examples of detection are given below:
  • a 3D glass identifier code is beforehand known by the 3D display device and stored into the display memory of this 3D display device.
  • the 3D glass identifier code is transmitted from the 3D glasses to the 3D display device.
  • a display processor of the 3D display device launches a comparison of this transmitted 3D glass identifier code with the 3D glass identifier code that is pre-stored in the display memory. If they are different, i.e. if no correspondence can be found by the processor between the transmitted code and the pre-stored code, then the processor asks the 3D glasses to transmit to the 3D display device its spectral transmission curve representing its color degradation, and a new color transform is computed and applied automatically as described below. Otherwise no change needs to be done for the color transform used to transform the source device dependent color image data into the destination device
  • the 3D glass color degradation model As exemplified on figure 1 by glasses transmission spectrum, has to be introduced into the color management workflow of figure 3. If user decides to change 3D glasses model, a dynamic color transform for the compensation of the new color degradation due these 3D new glasses should be introduced in the inverse color transform operation M'd -1 , as shown on figure 4. As shown on figure 4, the calculation of this new inverse color transform operation M'd -1 will depends on the display primary spectra (DX) and on the 3D glasses transmission spectrum (GX).
  • DX display primary spectra
  • GX 3D glasses transmission spectrum
  • a new color transform is calculated dynamically and applied to the RGB color values received by the 3D terminal instead of the previous one. Automatic and precise compensation of the color degradation due to the new 3D glasses can then be obtained.
  • the main general advantage of the invention is the automatic and dynamic color correction of the 3D glasses color degradation. There is no user contribution. Furthermore the method is very accurate as it uses a spectral degradation model for glasses. In final, a two components (panel/glasses) calibrated equipment is obtained and a better visual comfort is provided for the viewer. Interoperability between 3D TV systems, and, more generally, between 3D display devices can then be obtained.
  • a set top box receives the source device dependent color image data and transmit them to the 3D display device which performs all treatments internally.
  • the 3D display device is then considered as the 3D terminal receiving the source color component values RGBs.
  • the Tone Response Curve (TRC) can be implemented into a 1 D LUT while the Source model matrix Ms and the Destination model matrix Md "1 are merged into a single 3x3 matrix M or into a more complex 3D LUT.
  • TRC Tone Response Curve
  • the "1 D-M-1 D" structure shown in figure 6 can be implemented into either a FPGA or an ASIC inserted in the display device.
  • the dynamic color transform algorithm that is applied to the color component values RGBs is run on a processor while the display primary spectral data are stored into either a ROM or a RAM memory of the display device.
  • the receiver of the display device that is adapted to receive spectral transmission data from the 3D glasses should be compatible either for Infra red or wireless transmission with the 3D glasses.
  • gammatization TRCs and degammatization TRCd -1 operations are part of the new final color transform to be applied to the received device dependent source color image data representing the 3D images to display.
  • This example is also applicable to display device as nomad CE products such as tablets, PDA, ...
  • a 3D display system embodying the invention In a second example of a 3D display system embodying the invention, most of the treatments are performed in the set top box connected the display device.
  • the set top box is then considered as the 3D terminal receiving the source color component values RGBs.
  • the set top box is connected to the display device through a video data link adapted to transmit color image data to the display device.
  • This video data link is advantageously compliant with the HDMI standard.
  • Such an example is advantageous because set-top boxes have generally higher computation power (CPU/ media processor) compared to a display device. This allows more precision of the color calibration.
  • the receiver of the display device is adapted to receive spectral transmission data from the 3D glasses, through an Infra red or wireless link.
  • These glass spectral transmission data and the display primary spectral data should be transmitted from the display device to the set top box through a metadata uplink as shown in figure 7.
  • This metadata link is advantageously compliant with the HDMI standard.
  • Tone Response Curve (TRC) is implemented into a
  • FIG. 7 The "1 D-M-1 D" structure shown on figure 7 is implemented into the CPU of the set top box.
  • the display primary spectral data can be stored into either a ROM or a RAM memory of the display device.
  • gammatization TRCs and degammatization TRCd -1 operations are part of the new final color transform to be applied to the received device dependent source color image data representing the 3D images to display.
  • This second example is also applicable to embodiments where the set top box is replaced by a computer or a DVD player. It is to be understood that the method according to the present invention may be implemented in various forms of hardware, software, firmware, special purpose processors, or combinations thereof.
  • the software may be
  • the application program may be uploaded to, and executed by, a machine comprising any suitable architecture.
  • the machine is implemented on a computer platform having hardware such as one or more central processing units (“CPU"), a random access memory (“RAM”), and input/output ("I/O") interfaces.
  • CPU central processing units
  • RAM random access memory
  • I/O input/output
  • the computer platform may also include an operating system and microinstruction code.
  • the various processes and functions described herein may be either part of the microinstruction code or part of the application program, or any combination thereof, which may be executed by a CPU.
  • various other peripheral units may be connected to the computer platform such as an additional data storage unit and a printing unit.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

L'invention concerne un procédé comprenant les étapes consistant à : - détecter de nouvelles lunettes tridimensionnelles, - calculer une nouvelle transformée de couleurs en utilisant une fonction de transfert spectral de ces nouvelles lunettes tridimensionnelles détectées, - appliquer ladite nouvelle transformée de couleurs calculée afin de transformer des données d'image en couleurs reçues dépendant du dispositif source en données d'image en couleurs dépendant du dispositif de destination pour commander un panneau d'affichage afin d'afficher des images tridimensionnelles reçues représentées par ces données d'images en couleurs.
PCT/EP2011/074325 2011-02-10 2011-12-30 Étalonnage des couleurs d'un système d'affichage tridimensionnel comprenant un dispositif d'affichage tridimensionnel et des lunettes tridimensionnelles Ceased WO2012107152A1 (fr)

Applications Claiming Priority (2)

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EP11305139.5 2011-02-10
EP11305139 2011-02-10

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WO2012107152A1 true WO2012107152A1 (fr) 2012-08-16

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DE102014221057A1 (de) * 2014-10-16 2016-04-21 Continental Automotive Gmbh Verfahren zum Betreiben einer Anzeigevorrichtung, Anordnung und Kraftfahrzeug
EP3203308A3 (fr) * 2016-01-18 2017-11-29 Canon Kabushiki Kaisha Système d'affichage, lunettes et procédé de commande de système d'affichage
WO2022097153A1 (fr) * 2020-11-09 2022-05-12 Lumus Ltd. Réflexion arrière avec correction de couleur dans des systèmes ar
US11796729B2 (en) 2021-02-25 2023-10-24 Lumus Ltd. Optical aperture multipliers having a rectangular waveguide

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US20080316303A1 (en) * 2007-06-08 2008-12-25 Joseph Chiu Display Device
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US20080316303A1 (en) * 2007-06-08 2008-12-25 Joseph Chiu Display Device
US20110012896A1 (en) 2009-06-22 2011-01-20 Ji Maengsob Image display apparatus, 3d glasses, and method for operating the image display apparatus

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"Parameter Values For The HDTV Standard For Production And International Programme Exchange", SMPTE JOURNAL, vol. 107, no. 9, September 1998 (1998-09-01), pages 836 - 854
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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014221057A1 (de) * 2014-10-16 2016-04-21 Continental Automotive Gmbh Verfahren zum Betreiben einer Anzeigevorrichtung, Anordnung und Kraftfahrzeug
EP3203308A3 (fr) * 2016-01-18 2017-11-29 Canon Kabushiki Kaisha Système d'affichage, lunettes et procédé de commande de système d'affichage
US10181307B2 (en) 2016-01-18 2019-01-15 Canon Kabushiki Kaisha Display system, eyewear, and method for controlling display system
US11668933B2 (en) 2020-11-09 2023-06-06 Lumus Ltd. Color corrected back reflection in AR systems
KR20230051310A (ko) * 2020-11-09 2023-04-17 루머스 리미티드 Ar 시스템에서의 컬러 보정된 역반사
CN116097151A (zh) * 2020-11-09 2023-05-09 鲁姆斯有限公司 Ar系统中颜色校正的背反射
WO2022097153A1 (fr) * 2020-11-09 2022-05-12 Lumus Ltd. Réflexion arrière avec correction de couleur dans des systèmes ar
JP2023542239A (ja) * 2020-11-09 2023-10-05 ルーマス リミテッド Ａｒシステムにおける色補正された後方反射
JP7421839B2 (ja) 2020-11-09 2024-01-25 ルーマス リミテッド Ａｒシステムにおける色補正された後方反射
KR102638480B1 (ko) 2020-11-09 2024-02-19 루머스 리미티드 역반사되는 환경의 주변광의 색도를 조절하는 방법
JP2024038275A (ja) * 2020-11-09 2024-03-19 ルーマス リミテッド Ａｒシステムにおける色補正された後方反射
CN116097151B (zh) * 2020-11-09 2024-04-09 鲁姆斯有限公司 Ar系统中颜色校正的背反射
US12013529B2 (en) 2020-11-09 2024-06-18 Lumus Ltd. Color corrected back reflection in AR systems
TWI855275B (zh) * 2020-11-09 2024-09-11 以色列商魯姆斯有限公司 調節環境中的環境光的色度的方法和擴增實境系統
US11796729B2 (en) 2021-02-25 2023-10-24 Lumus Ltd. Optical aperture multipliers having a rectangular waveguide

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