CN115022609A - Color gamut matching method, system and storage medium for movie and television shooting - Google Patents
Color gamut matching method, system and storage medium for movie and television shooting Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
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- 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
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Abstract
The invention relates to a color gamut matching method, a system and a storage medium for movie and television shooting, wherein the color gamut matching method for movie and television shooting comprises the following steps: correcting the LED display screen point by point to be a target color gamut by a color gamut corrector (X1, Y1, Z1); judging whether the color gamut is a target color gamut or not; if not, re-correcting; if yes, entering the next step; calculating a conversion matrix TM1 from a target color gamut (X1, Y1, Z1) to tristimulus values (X, Y, Z) of RGB three primary colors in an XYZ color space; curing the conversion matrix TM1 to each lamp of the LED display screen to complete the conversion of the target display color gamut of the LED display screen; and performing real-time color gamut conversion adjustment on the LED display screen according to the color gamut (X2, Y2, Z2) of the picture of the LED display screen shot by the collecting camera. The shooting equipment can meet the requirement of showing by directly shooting the LED display screen, and the film and television shooting efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of film and television shooting, and particularly relates to a color gamut matching method, a color gamut matching system and a storage medium for film and television shooting.
Background
Most of film and television shooting presents different scenes through the LED display screen, the camera shoots different versions of films through shooting people and pictures combined by the LED display screen, the method is convenient and efficient, and the accuracy of the color gamut of the LED display screen is important. The colour gamut can accurately show the look scope of appearing of image, nevertheless shooting equipment carries out the colour gamut when shooing and matches the back, and the loss of image in transmission, replay process is great again, causes the film colour gamut to mismatch, and the display effect is not good.
Most of the prior art is a technology for matching a source image with a target terminal display device color gamut, and the technology for matching with a shooting output color gamut is not involved. However, the color gamut matching technology using the source image and the target terminal display device has the following disadvantages: because the color conversion curves of the camera and the terminal display device have the characteristic of device correlation, after the terminal display device is converted into a target color gamut (such as a movie color gamut DCI-P3 according to the SMPTE standard), the color gamut shot by the camera is not completely correct and cannot completely meet the DCI-P3.
Disclosure of Invention
The present invention is directed to a method, a system and a storage medium for color gamut matching in movie and television shooting, so as to solve the above technical problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a color gamut matching method for movie and television shooting, which comprises the following steps:
correcting the LED display screen point by point to be a target color gamut by a color gamut corrector (X1, Y1, Z1);
judging whether the color gamut is a target color gamut or not;
if not, re-correcting; if yes, entering the next step;
calculating a conversion matrix TM1 from the target color gamut (X1, Y1, Z1) to tristimulus values (X, Y, Z) of RGB three primary colors in an XYZ color space;
curing the conversion matrix TM1 to each lamp of the LED display screen to complete the conversion of the target display color gamut of the LED display screen;
and performing real-time color gamut conversion adjustment on the LED display screen according to the color gamut (X2, Y2, Z2) of the picture of the LED display screen shot by the collecting camera.
Optionally, the step of calculating a conversion matrix TM1 from the target color gamut (X1, Y1, Z1) to tristimulus values (X, Y, Z) of RGB tristimulus colors in the XYZ color space specifically comprises:
tristimulus values (X, Y, Z) of RGB (red, green, blue) three primary colors of the LED display screen in an XYZ color space are values under the SMPTE standard;
the matching relationship between the target color gamut (X1, Y1, Z1), the tristimulus values (X, Y, Z), and the conversion matrix TM1 is as follows:
the transformation matrix TM1 is obtained.
Optionally, the step of performing real-time color gamut conversion adjustment on the LED display screen according to the color gamut (X2, Y2, Z2) of the picture of the LED display screen captured by the capturing camera further includes:
inverse transformation calculates a transformation matrix TM2 from the color gamut (X2, Y2, Z2) of the LED display screen pictures shot by the camera to the tristimulus values (X, Y, Z);
superposing the conversion matrix TM2 to a signal source or an LED display screen;
and the LED display screen performs color gamut conversion to finish color gamut output.
Optionally, the matching relationship between the target color gamut (X1, Y1, Z1), the tristimulus values (X, Y, Z) and the transformation matrix TM2 is as follows:
the present invention further provides a color gamut matching system for movie and television shooting, comprising:
the LED display screen is used for displaying pictures required by movie and television shooting;
the LED control module is used for correcting the LED display screen point by point to ensure that the LED display screen is bright and consistent in color gamut;
the XR camera is used for shooting videos;
the terminal display equipment is used for displaying the shooting picture of the XR camera;
the color gamut acquisition module is used for acquiring the color gamut of the shot LED display screen picture;
the XR camera is connected with the terminal display equipment and transmits shot pictures; the LED display screen and the color gamut acquisition module are connected with the LED control module, the color gamut acquisition module transmits acquired color gamut information to the LED control module, and the LED control module performs color gamut adjustment on the LED display screen after calculation; the color gamut matching system for movie shooting is used for implementing the color gamut matching method for movie shooting described in any one of the above embodiments.
Optionally, the LED display screen comprises a Mini LED or a Micro LED display screen.
Optionally, the color gamut capturing module further includes:
the signal sending unit is used for converting the collected color gamut information into a signal and transmitting the signal to the LED control module;
and the color gamut judging unit is used for judging whether the color gamut reaches a required value or not.
Optionally, the LED control module further comprises
The signal conversion unit is used for converting the signals received from the signal sending unit into data capable of performing matrix calculation;
and the matrix calculation unit is used for calculating the data capable of performing matrix calculation.
Optionally, the color gamut acquisition module is configured to directly acquire color gamut information for the terminal display device and/or the XR camera.
The present application further provides a storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the color gamut matching method for movie shooting according to any one of the above embodiments.
According to the invention, the problem of device correlation color gamut matching is avoided by matching the shot LED display screen signal with the projection standard color gamut; the LED display screen after the color gamut conversion is shot by the camera, the obtained image color gamut is the target color gamut, and a source image does not need to be matched with the color gamut of target terminal display equipment; through the transformation of positive and negative color gamut, the shot LED display screen picture meets the playing standard of DCI-P3 or other color gamut in SMPTE.
Drawings
Fig. 1 is a flowchart of a color gamut matching method for movie shooting according to an embodiment of the present invention;
fig. 2 is a specific flowchart of a method for performing real-time color gamut conversion adjustment on an LED display screen according to another embodiment of the present application;
fig. 3 is a schematic diagram of a color gamut matching system for movie shooting according to another embodiment of the present invention.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
According to the SMPTE standard, the color gamut information of tristimulus values (X, Y, Z) of RGB tristimulus values of the LED display screen in XYZ color space is shown below;
| R | G | B | White point | |
| DCI-P3 | (0.68,0.32) | (0.265,0.69) | (0.15,0.06) | (0.3127,0.3290) |
| REC709 | (0.640,0.330) | (0.300,0.600) | (0.150,0.060) | (0.3127,0.3290) |
| REC2020 | (0.708,0.292) | (0.170,0.797) | (0.131,0.046) | (0.3127,0.3290) |
referring to fig. 1, fig. 1 is a flowchart illustrating a color gamut matching method for movie shooting according to an embodiment of the present invention; the color gamut matching method for movie shooting comprises the following steps:
step S110, correcting the LED display screen point by point to be a target color gamut through a color gamut corrector (X1, Y1, Z1);
step S111, judging whether the color gamut is a target color gamut; specifically, the brightness and the chromaticity of the LED display screen are consistent after correction;
if not, re-correcting; if yes, go to step S120;
step S120, calculating a conversion matrix TM1 from the target color gamut (X1, Y1, Z1) to the tristimulus values (X, Y, Z) of the RGB three primary colors in the XYZ color space;
s130, solidifying the conversion matrix TM1 to each lamp of the LED display screen to complete target display color gamut conversion of the LED display screen; at the moment, the color gamut on the LED display screen meets the requirement of SMPTE (simple tone quality indicator) projection or rebroadcasting;
and S140, carrying out real-time color gamut conversion adjustment on the LED display screen according to the color gamut (X2, Y2 and Z2) of the picture of the LED display screen shot by the collecting camera.
In some alternative embodiments, the step of calculating a transformation matrix TM1 from the target color gamut (X1, Y1, Z1) to tristimulus values (X, Y, Z) of RGB tristimulus colors in the XYZ color space specifically comprises:
tristimulus values (X, Y, Z) of RGB (red, green, blue) three primary colors of the LED display screen in an XYZ color space are values under the SMPTE standard;
the matching relationship between the target color gamut (X1, Y1, Z1), the tristimulus values (X, Y, Z), and the conversion matrix TM1 is as follows:
the transformation matrix TM1 is derived, in particular,
is a correction factor.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for performing real-time color gamut conversion adjustment on an LED display screen according to another embodiment of the present disclosure; the method comprises the following steps:
step S141, calculating a conversion matrix TM2 from the LED display screen picture color gamut (X2, Y2, Z2) shot by the camera to the tristimulus values (X, Y, Z) through inverse transformation;
step S142, superposing the conversion matrix TM2 on a signal source or an LED display screen;
and step S143, performing color gamut conversion on the LED display screen to finish color gamut output.
In further alternative embodiments, the matching relationship between the target color gamut (X1, Y1, Z1), the tristimulus values (X, Y, Z), and the conversion matrix TM2 is as follows:
wherein,
is the correction coefficient in the matching relation.
By the color gamut matching method for movie and television shooting, the finally obtained conversion matrix TM2 is superposed on a signal source or an LED display screen for color and conversion, the LED display screen finishes color gamut output, and the color gamut of an image obtained after shooting by a camera meets the requirements of showing or rebroadcasting.
Referring to fig. 3, fig. 3 is a schematic diagram of a color gamut matching system for movie shooting according to another embodiment of the present invention; the color gamut matching system 10 for movie shooting comprises:
the LED display screen 20 is used for displaying pictures required by movie and television shooting;
the LED control module 60 is configured to correct the LED display screen 20 point by point, so that the LED display screen 20 is bright and has a consistent color gamut;
an XR camera 40 for movie shooting;
a terminal display device 30 for displaying the captured images of the XR camera;
the color gamut acquisition module 50 is used for acquiring the color gamut of the shot picture of the LED display screen 20;
the XR camera 40 is connected with the terminal display device 30 and transmits shot pictures; the LED display screen 20 and the color gamut acquisition module 50 are connected to the LED control module 60, the color gamut acquisition module 50 transmits the acquired color gamut information to the LED control module 60, and the LED control module 60 performs color gamut adjustment on the LED display screen 20 after calculation; the system 10 for matching color gamut of movie shooting is used to implement the method for matching color gamut of movie shooting described in any of the above embodiments.
In other alternative embodiments, the LED control module 60 further comprises: a signal conversion unit 61 for converting the signal received from the signal transmission unit into data that can be subjected to matrix calculation; the matrix calculation unit 62 is used for calculating data that can be subjected to matrix calculation. In particular, the signal conversion unit may be, but is not limited to, a signal source or a signal generator.
In some alternative embodiments, the LED display screen 20 includes, but is not limited to, a Mini LED or Micro LED display screen. The color gamut acquisition module 50 is configured to directly acquire color gamut information of the terminal display device 30 and/or the XR camera, specifically, when the color gamut matching system 10 for movie shooting executes step S110 in fig. 1, the color gamut acquisition module 50 directly acquires the color gamut of the LED display screen 20, and performs point-by-point correction; in step S130 of fig. 1, the gamut capturing module 50 may directly capture the gamut information captured by the XR camera 40 or perform gamut calculation by capturing the gamut of the image played on the terminal display device 30. For example, gamut information captured on XR camera 40 may be collected by an oscilloscope; for the terminal display device 30, the color gamut of its playing image may be captured by a light gun.
The color gamut matching system for movie shooting finally obtains the conversion matrix TM2 through forward and backward conversion calculation, the conversion matrix TM2 is finally superposed on the LED display screen to complete display color gamut output, and through equipment shooting, the obtained image meets the projection standard, so that the method is convenient and fast, has simple steps, and improves the post-production efficiency of movie shooting.
An embodiment of the present invention further provides a storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the color gamut matching method for movie shooting according to any one of the above embodiments.
The system/computer device integrated components/modules/units, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method of the above embodiments may be implemented by a computer program, which may be stored in a computer readable storage medium and used by a processor to implement the steps of the above method embodiments. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable storage medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The invention is not the best known technology.
In the several embodiments provided in the present invention, it should be understood that the disclosed system and method may be implemented in other ways. For example, the system embodiments described above are merely illustrative, and for example, the division of the components is only one logical division, and other divisions may be realized in practice.
In addition, each functional module/component in each embodiment of the present invention may be integrated into the same processing module/component, or each module/component may exist alone physically, or two or more modules/components may be integrated into the same module/component. The integrated modules/components can be implemented in the form of hardware, or can be implemented in the form of hardware plus software functional modules/components.
It will be evident to those skilled in the art that the embodiments of the present invention are not limited to the details of the foregoing illustrative embodiments, and that the embodiments of the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the embodiments being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. Several units, modules or means recited in the system, device or terminal claims may also be implemented by one and the same unit, module or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A color gamut matching method for movie and television shooting is characterized by comprising the following steps:
correcting the LED display screen point by point to be a target color gamut by a color gamut corrector (X1, Y1, Z1);
judging whether the color gamut is a target color gamut or not;
if not, re-correcting; if yes, entering the next step;
calculating a conversion matrix TM1 from the target color gamut (X1, Y1, Z1) to tristimulus values (X, Y, Z) of RGB three primary colors in an XYZ color space;
curing the conversion matrix TM1 to each lamp of the LED display screen to complete the conversion of the target display color gamut of the LED display screen;
and performing real-time color gamut conversion adjustment on the LED display screen according to the color gamut (X2, Y2 and Z2) of the picture of the LED display screen shot by the collecting camera.
2. The method for matching color gamut of movie and television shots according to claim 1 characterized in that the step of calculating a transformation matrix TM1 from the target color gamut (X1, Y1, Z1) to the tristimulus values (X, Y, Z) of the RGB tristimulus in the XYZ color space specifically comprises:
tristimulus values (X, Y, Z) of RGB (red, green, blue) three primary colors of the LED display screen in an XYZ color space are values under the SMPTE standard;
the matching relationship between the target color gamut (X1, Y1, Z1), the tristimulus values (X, Y, Z), and the conversion matrix TM1 is as follows:
the transformation matrix TM1 is obtained.
3. The method for matching color gamut of movie and television shooting as claimed in claim 1, wherein the step of performing real-time color gamut conversion adjustment on the LED display screen according to the color gamut (X2, Y2, Z2) of the LED display screen shot by the capturing camera further comprises:
inverse transformation calculates a transformation matrix TM2 from the color gamut (X2, Y2, Z2) of the LED display screen pictures shot by the camera to the tristimulus values (X, Y, Z);
superposing the conversion matrix TM2 to a signal source or an LED display screen;
and the LED display screen performs color gamut conversion to finish color gamut output.
4. The method of matching color gamut of movie shooting according to claim 3, characterized in that the matching relationship among the target color gamut (X1, Y1, Z1), the tristimulus values (X, Y, Z) and the transformation matrix TM2 is as follows:
5. a gamut matching system for movie and television photography, comprising:
the LED display screen is used for displaying pictures required by movie and television shooting;
the LED control module is used for correcting the LED display screen point by point to ensure that the LED display screen is bright and consistent in color gamut;
the XR camera is used for shooting videos;
the terminal display equipment is used for displaying the shooting picture of the XR camera;
the color gamut acquisition module is used for acquiring the color gamut of the shot LED display screen picture;
the XR camera is connected with the terminal display equipment and transmits shot pictures; the LED display screen and the color gamut acquisition module are connected with the LED control module, the color gamut acquisition module transmits the acquired color gamut information to the LED control module, and the LED control module performs color gamut adjustment on the LED display screen after calculation; the color gamut matching system for the movie and television shooting is used for implementing the color gamut matching method for the movie and television shooting, which is defined by any one of claims 1-4.
6. The system for matching color gamut of movie and television shooting according to claim 5, characterized in that the LED display screen comprises a Mini LED or Micro LED display screen.
7. The system for matching color gamut for movie and television shooting according to claim 6, wherein the color gamut capturing module further comprises:
the signal sending unit is used for converting the collected color gamut information into a signal and transmitting the signal to the LED control module;
and the color gamut judging unit is used for judging whether the color gamut reaches a required value or not.
8. The system for gamut matching for movie and television photography of claim 7, wherein the LED control module further comprises:
the signal conversion unit is used for converting the signals received from the signal sending unit into data capable of performing matrix calculation;
and the matrix calculation unit is used for calculating the data capable of performing matrix calculation.
9. The system of claim 7, wherein the gamut acquisition module is configured to directly acquire gamut information from the terminal display device and/or the XR camera.
10. A storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the method of gamut matching for movie shooting as claimed in any one of claims 1 to 4.
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