EP2871634A1 - Amélioration de la couleur de partie sélectionnée d'une image - Google Patents

Amélioration de la couleur de partie sélectionnée d'une image Download PDF

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Publication number
EP2871634A1
EP2871634A1 EP20130306523 EP13306523A EP2871634A1 EP 2871634 A1 EP2871634 A1 EP 2871634A1 EP 20130306523 EP20130306523 EP 20130306523 EP 13306523 A EP13306523 A EP 13306523A EP 2871634 A1 EP2871634 A1 EP 2871634A1
Authority
EP
European Patent Office
Prior art keywords
image
version
display device
color
color coordinates
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Withdrawn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
EP20130306523
Other languages
German (de)
English (en)
Inventor
Jurgen Stauder
Patrick Morvan
Emmanuel Jolly
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.)
Thomson Licensing SAS
Original Assignee
Thomson Licensing SAS
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 Licensing SAS filed Critical Thomson Licensing SAS
Priority to EP20130306523 priority Critical patent/EP2871634A1/fr
Publication of EP2871634A1 publication Critical patent/EP2871634A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0686—Adjustment of display parameters with two or more screen areas displaying information with different brightness or colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0693—Calibration of display systems
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/06—Colour space transformation

Definitions

  • the invention is directed to methods and systems for color transformation of image adapted to provide predictable results on display devices having different color rendering characteristics, notably different color gamuts.
  • the first problem is that display devices with new technology are generally available only in small sizes, i.e. for small TV sets, for tablets, and for mobile phones, and are only later available in larger sizes, notably for most common TV sets and color monitors.
  • the late availability of display devices with larger size does not allow exploiting on these devices the specific features of this new technology immediately when this technology is available.
  • a user has only two choices: either use the same old display technology with lower color characteristics on any size of display devices or use the new display technology with higher color characteristics but with a limitation to small size.
  • the second problem is that a new display technology requires a calibration of color reproduction. Colors should be reproduced on the display of new technology in a way to fully exploit the color gamut of this technology while keeping a reasonably close look to the image shown on a post-production reference display of an older technology for which the image has been created by the content creator. Such an exploitation of larger color gamut generally implies color mapping of colors from the gamut of the post-production reference display into the gamut of the display of the new technology. Therefore, color calibration of the display of new technology is needed.
  • the color calibration of the display of new technology means that a color on the display of new technology should have the same XYZ coordinates as the corresponding color on the reference display of the older technology.
  • the first challenge is to use the new color options (for example lower black level, better saturation) in order to reproduce colors with same colorimetry.
  • the second challenge is to use these new options (for example higher contrast values) in order to generate appealing images.
  • the third problem is the consistence of colors shown on the display devices of two different technologies, for example a new technology and a former technology.
  • the colors on both displays will change. It might be, notably, that a first rendering intent gives acceptable results on both displays while a second rendering intent gives better results on the first display and worse results on the second display.
  • a colorist who is looking for the "best" rendering intents for the two displays might have checked a large range of colors and a series of rendering intents in order to find a result that is satisfying for him. He also has so compare each time the two displays in order to verify the colors. If the two displays are of different technologies, for example a new technology and a former technology, and if the displays are of different sizes, the work may become quite complex for the colorist.
  • the invention addresses the three problems above, notably in the following way: using a first display device of an old technology and with a large size to display large images, using a second display device of a new technology and with a smaller size to display selected parts of the large images displayed on the first display device, displaying these selected parts on the second display device and taking advantage of the larger possibilities of color reproduction of this second display device to transform colors of these selected parts, and transferring back the color transformation of these selected parts to these images to display improved versions of the large images on the first display device.
  • the subject of the invention is a method of generating a second version of a first image from a first version of said image, comprising the steps of:
  • the selection of a portion of the first version of the first image corresponds generally to a cropping action.
  • the device dependent color coordinates representing the first version of the second image are obtained through a color calibration of the original device dependent color coordinates corresponding to the selected portion of the first version of the first image, said color calibration being performed such that the second display device controlled by these device dependent color coordinates representing the first version of the second image reproduces approximately the same colors as the first display device controlled by these original device dependent color coordinates.
  • a calibration step before the color transformation step is optional.
  • there is no calibration step and the device dependent color coordinates representing the first version of the second image are directly the original device dependent color coordinates.
  • the step of color transforming is performed according to a parametric model with predetermined color correction parameters.
  • a user chooses the value of these color transformation parameters that defines how colors are reproduced on the second display device.
  • These values may be notably chosen according to a specific rendering intent, for example for preserving the colorimetry or color appearance, and/or for extending the color gamut, and/or for optimizing color saturation.
  • the step of color transforming is performed by retouching a reproduction of the first version of the second image on the second display device.
  • Usual color retouching tools can be used for this purpose.
  • the second display device is used as a proof-viewing display device.
  • the step of selecting a portion of the first version of the first image comprises itself a step of reproducing this first version on said first display device and a step of pointing within the reproduction of said first version.
  • a camera is used.
  • this camera is part of the second display device.
  • a gyroscopic remote control set adapted to control the first display device is used, or a mouse connected to the first display device is used.
  • the method according to the invention comprises also the steps of:
  • the first display device would be a main display as a TV set and the second display device would be a secondary display as a tablet.
  • An object of the invention is also a system for generating a second version of a first image from a first version of said image, comprising:
  • figure 1 represents conceptual views of illustrative circuitry embodying the invention. It may be substantially represented in computer readable media and so executed by a computer or processor, whether or not such computer or processor is explicitly shown.
  • the functions of the various elements shown in the figures may be provided through the use of dedicated hardware as well as hardware capable of executing software in association with appropriate software.
  • a first display device and a second display device have different color reproduction characteristics, notably different color gamuts.
  • the invention is typically implemented by using an LCD TV set as a first display device and an OLED tablet as a second display device.
  • the LCD TV set displays images and portions of these images can be reproduced on the OLED tablet. Due to its larger color characteristics, the OLED tablet allows to discover brilliant colors on some regions of these images, that are not shown as brilliant on the LCD TEV set.
  • the transformed colors can be pasted on the LCD TV set such as if the tablet was a brush.
  • the system used to implement the invention comprises:
  • the system used to implement the invention generally comprises at least a CPU to implement all the above softwares, with its usual peripheral devices such as memories and interfaces, connected through a bus.
  • a CPU with peripheral devices is preferably integrated in the second display device and its camera on a specific device like a tablet or a smartphone.
  • the image server distributes a first version of a first image to the first display device. This first version is then reproduced on this first display device by controlling this first display device with original device dependent color coordinates as distributed by the server.
  • the position measuring device measures the relative position, orientation and viewing angle (size of portion) of this camera, i.e. of the second display device, with respect to the first display device.
  • Such pointing methods with measurement of relative position are described for instance in US2006-038833 , US2009-174653 or US2012-214591 .
  • the selection performed by the user corresponds notably to a zone of color interest, as appreciated by this user.
  • the image cropping means the first image is cropped according to the selected portion, resulting in a first version of a second image.
  • device dependent color coordinates representing the first version of this second image are obtained through a color calibration of the original device dependent color coordinates that are used to control the first display device in order to reproduce, as explained above, the selected portion of the first version of the first image.
  • the device dependent color coordinates which are obtained through this calibration are then such that the second display device controlled by these device dependent color coordinates reproduces approximately the same colors as the colors shown on the first display device controlled by the original device dependent color coordinates before their calibration.
  • the second display device is color calibrated by the first color calibrator such that the second image can be reproduced on this second display device as shown within the first image reproduced on the first display device. This calibration is generally limited by the capacities of the second display device.
  • ICC International Color Consortium
  • Profile version 4.2.0.0 Image technology colour management - Architecture, profile format, and data structure
  • the ICC profile allows referring device-dependent display input colors to a Profile Connection Space (PCS).
  • PCS is intended to enable the user of ICC profiles to determine or compensate colors differences.
  • the profile can include:
  • ICC profile PCS is based on CIE 1931 XYZ color space (or CIELAB derived from it).
  • CIE 1931 XYZ color space or CIELAB derived from it.
  • the first and second display devices are each described by an ICC profile.
  • Each profile has a forward and an inverse color transform.
  • the following parameters are preferably chosen:
  • the first color calibrator applies the forward color transform of the ICC profile of the first display device and the inverse transform of the ICC profile of the second display device.
  • Such a calibration step before the color transformation step is optional, as shown on the figures by using dotted lines instead of continuous lines.
  • the device dependent color coordinates that are used to reproduce the selected portion of the first image on the first display device are used, without color calibration, as the device dependent color coordinates representing the first version of the second image.
  • the second display devices controlled by the device dependent color coordinates representing the first version of the second image would not reproduce the same colors compared to the first image reproduced on the first display device.
  • This first version of the second image is then reproduced on the second display device by controlling it using the device dependent color coordinates representing the first version of the second image, as above color calibrated when they are. Displaying this first version is optional but advantageous for the next step.
  • these device dependent color coordinates representing the first version of the second image are then transformed into transformed device dependent colors coordinates that represents a second version of the second image.
  • a color correction software allowing control of hue, saturation and brightness of the second image, globally or locally in the second image, globally for all colors or specifically for a certain range of colors, is used.
  • the user uses the control of hue, saturation and brightness to find the color transformation of the colors according to his intent.
  • a second version of this second image is displayed on the second display device, up to a last modification of hue, saturation and brightness, resulting in a final version of the second image.
  • the final transformed device dependent color coordinates that are obtained and used to reproduce as above the final second version of the second image are color calibrated into calibrated device dependent color coordinates resulting into a calibrated final second version of the second image such that the first display device controlled by these calibrated device dependent color coordinates reproduces approximately the same colors as those shown on this second display device.
  • the same method using the specification ICC.1:2004-10 (Profile version 4.2.0.0) is preferably used.
  • the second calibrator applies the color forward transform of the second display device and the inverse transform of the first display device.
  • the first display device is color calibrated by the second color calibrator such that the second version of the second image can be reproduced on this first display device as it is reproduced on the second display device after the last modification of hue, saturation and brightness.
  • This calibration is again limited by the capacities of the first display device.
  • colors outside the color gamut of this first display device cannot be reproduced such as on the second display device.
  • precision limits of the first display device such as quantization of encoded color coordinates RGB for red, green and blue, can lead to slight color derivations when compared to the transformed device dependent colors coordinates of the final second version of the second image reproduced on the second display device.
  • this calibrated final version of the second image is pasted in the first image at the same position at which the second image has been cropped, such a position being given by the position measuring device, as described above.
  • the original device dependent color coordinates representing the selected portion are replaced by their corresponding calibrated device dependent color coordinates.
  • Such a pasting results in a second version of the first image.
  • the last step is then to reproduce this second version of the first image on the first display device, using, to control it the device dependent color coordinates that are color calibrated after transformation, as described above. Due to this color calibration, the brilliant colors that have been discovered by the user on the first image and transformed on the second display device that has higher color capabilities compared to the first display device, are corrected and reproduced on the first display device.
  • the display devices of old technology and large size can take benefit of the higher color characteristics of display devices of new technology even of smaller size. Therefore, it is possible to take advantage of a new display technology of display device as soon as it is available.
  • This invention can be advantageously valorized through software application downloaded from specific internet sites dedicated to new technology display devices.
  • This invention can also advantageously valorized in postproduction of content for new technology display devices however, using the large size of display devices of old technology.
  • the invention may be implemented in various forms of hardware, software, firmware, special purpose processors, or combinations thereof.
  • the invention may be notably implemented as a combination of hardware and software.
  • the software may be implemented as an application program tangibly embodied on a program storage unit.
  • the application program may be uploaded to, and executed by, a machine comprising any suitable architecture.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Color Image Communication Systems (AREA)
  • Facsimile Image Signal Circuits (AREA)
EP20130306523 2013-11-06 2013-11-06 Amélioration de la couleur de partie sélectionnée d'une image Withdrawn EP2871634A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20130306523 EP2871634A1 (fr) 2013-11-06 2013-11-06 Amélioration de la couleur de partie sélectionnée d'une image

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20130306523 EP2871634A1 (fr) 2013-11-06 2013-11-06 Amélioration de la couleur de partie sélectionnée d'une image

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EP2871634A1 true EP2871634A1 (fr) 2015-05-13

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060038833A1 (en) 2004-08-19 2006-02-23 Mallinson Dominic S Portable augmented reality device and method
US20090174653A1 (en) 2008-01-07 2009-07-09 Samsung Electronics Co., Ltd. Method for providing area of image displayed on display apparatus in gui form using electronic apparatus, and electronic apparatus applying the same
US20090256856A1 (en) * 2008-04-10 2009-10-15 Texas Intruments Incorporated Method and System for Emulating a Display
US20100265264A1 (en) * 2006-12-21 2010-10-21 Thomson Licensing Method, apparatus and system for providing color grading for displays
US20120214591A1 (en) 2011-02-22 2012-08-23 Nintendo Co., Ltd. Game device, storage medium storing game program, game system, and game process method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060038833A1 (en) 2004-08-19 2006-02-23 Mallinson Dominic S Portable augmented reality device and method
US20100265264A1 (en) * 2006-12-21 2010-10-21 Thomson Licensing Method, apparatus and system for providing color grading for displays
US20090174653A1 (en) 2008-01-07 2009-07-09 Samsung Electronics Co., Ltd. Method for providing area of image displayed on display apparatus in gui form using electronic apparatus, and electronic apparatus applying the same
US20090256856A1 (en) * 2008-04-10 2009-10-15 Texas Intruments Incorporated Method and System for Emulating a Display
US20120214591A1 (en) 2011-02-22 2012-08-23 Nintendo Co., Ltd. Game device, storage medium storing game program, game system, and game process method

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