CN115022609B - Color gamut matching method, system and storage medium for film and television shooting - Google Patents
Color gamut matching method, system and storage medium for film and television shooting Download PDFInfo
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- CN115022609B CN115022609B CN202110236133.9A CN202110236133A CN115022609B CN 115022609 B CN115022609 B CN 115022609B CN 202110236133 A CN202110236133 A CN 202110236133A CN 115022609 B CN115022609 B CN 115022609B
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000003860 storage Methods 0.000 title claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 44
- 239000011159 matrix material Substances 0.000 claims abstract description 31
- 239000003086 colorant Substances 0.000 claims abstract description 9
- 238000004590 computer program Methods 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 11
- 230000009466 transformation Effects 0.000 claims description 6
- 230000008054 signal transmission Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000009877 rendering Methods 0.000 description 1
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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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- Theoretical Computer Science (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
The invention relates to a color gamut matching method, a system and a storage medium for film and television shooting, wherein the color gamut matching method for film and television shooting comprises the following steps: correcting the LED display screen point by point to be a target color gamut (X1, Y1, Z1) through a color gamut corrector; judging whether the color gamut is a target color gamut; 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; solidifying the conversion matrix TM1 to each lamp of the LED display screen to finish the target display color gamut conversion of the LED display screen; and performing real-time color gamut conversion adjustment on the LED display screen according to the color gamuts (X2, Y2 and Z2) of the LED display screen shot by the acquisition camera. The shooting equipment can be used for directly shooting the LED display screen, so that the projection requirement can be met, 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 system and a storage medium for film and television shooting.
Background
Most of film and television shooting shows different scenes through an LED display screen, and a camera shoots different versions of films by combining pictures of a shooting person and the LED display screen. The color gamut can accurately show the color rendering range of image, but shooting equipment carries out the color gamut after matching when shooing, and the loss of image in transmission, replay in-process is great, causes the video color gamut mismatch, and the display effect is not good.
Most of the current technologies are technologies for matching the color gamut of the source image and the target terminal display device, and do not involve matching with the photographed output color gamut. The following disadvantages are caused by using the color gamut matching technology of the source image and the target terminal display device: 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 film color gamut DCI-P3 according to SMPTE standard), the color gamut shot by the camera is not completely correct, and cannot completely accord with the DCI-P3.
Disclosure of Invention
The invention aims to provide a color gamut matching method, a system and a storage medium for film and television shooting, so as to solve the technical problems.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides a color gamut matching method for film and television shooting, which comprises the following steps:
correcting the LED display screen point by point to be a target color gamut (X1, Y1, Z1) through a color gamut corrector;
judging whether the color gamut is a target color gamut;
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;
solidifying the conversion matrix TM1 to each lamp of the LED display screen to finish the target display color gamut conversion of the LED display screen;
and performing real-time color gamut conversion adjustment on the LED display screen according to the color gamuts (X2, Y2 and Z2) of the LED display screen shot by the acquisition 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 the RGB three primary colors in the XYZ color space specifically includes:
the tristimulus values (X, Y, Z) of the RGB three primary colors of the LED display screen in the XYZ color space are values under the SMPTE standard;
the matching relationship among 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 image color gamuts (X2, Y2, Z2) of the LED display screen captured by the capturing camera further includes:
the inverse transformation calculates a transformation matrix TM2 from the LED display screen picture color gamut (X2, Y2, Z2) 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 performing color gamut conversion on the LED display screen to finish color gamut output.
Optionally, the matching relationship among the target color gamut (X1, Y1, Z1), the tristimulus values (X, Y, Z), and the conversion matrix TM2 is as follows:
the invention also provides a color gamut matching system for film and television shooting, which comprises:
the LED display screen is used for displaying pictures required by film 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 the color gamut is consistent;
an XR camera for shooting film and television;
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 a shooting picture; 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 carries out color gamut adjustment on the LED display screen after calculation; the color gamut matching system for film and television shooting is used for implementing the color gamut matching method for film and television shooting in any of the embodiments.
Optionally, the LED display screen includes a Mini LED or Micro LED display screen.
Optionally, the color gamut acquisition module further includes:
the signal sending unit is used for converting the collected color gamut information into signals and transmitting the signals to the LED control module;
and the color gamut judging unit is used for judging whether the color gamut reaches a required value.
Optionally, the LED control module further comprises
A signal conversion unit for converting the signal received from the signal transmission unit into data that can be matrix-calculated;
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 acquire color gamut information directly for the terminal display device and/or the XR camera.
The present application also provides a storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the gamut matching method of film and television capturing as described in any of the above embodiments.
As can be seen from the above, the invention avoids the problem of matching the correlation color gamut of the equipment by shooting the signal of the LED display screen to match 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 the source image is not required to be matched with the target terminal display equipment color gamut; through the forward and reverse color gamut conversion, the shot LED display screen meets the playing standard of DCI-P3 or other color gamuts in SMPTE.
Drawings
Fig. 1 is a flowchart of a color gamut matching method for film and television shooting according to an embodiment of the present invention;
FIG. 2 is a flowchart of a method for performing real-time color gamut conversion adjustment on an LED display screen according to another embodiment of the present invention;
fig. 3 is a schematic diagram of a color gamut matching system for film and video shooting according to another embodiment of the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. In addition, embodiments of the present application and features of the embodiments 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 SMPTE standard, the color gamut information of the three stimulus values (X, Y, Z) of the RGB three primary colors of the known LED display screen in the XYZ color space is shown as follows;
| 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 of a color gamut matching method for film and television shooting according to an embodiment of the invention; the color gamut matching method for film and television shooting comprises the following steps:
step S110, correcting the LED display screen point by point to be a target color gamut (X1, Y1, Z1) through a color gamut corrector;
step S111, judging whether the color gamut is a target color gamut; specifically, the brightness and the chromaticity of the corrected LED display screen reach consistency;
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 tristimulus values (X, Y, Z) of RGB three primary colors in an XYZ color space;
step S130, solidifying the conversion matrix TM1 to each lamp of the LED display screen to finish the target display color gamut conversion of the LED display screen; at this time, the color gamut on the LED display screen should meet the requirements of SMPTE projection or retransmission;
and step 140, performing real-time color gamut conversion adjustment on the LED display screen according to the color gamuts (X2, Y2 and Z2) of the LED display screen shot by the acquisition camera.
In some alternative embodiments, the step of calculating the 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 specifically includes:
the tristimulus values (X, Y, Z) of the RGB three primary colors of the LED display screen in the XYZ color space are values under the SMPTE standard;
the matching relationship among the target color gamut (X1, Y1, Z1), the tristimulus values (X, Y, Z), and the conversion matrix TM1 is as follows:
the conversion matrix TM1 is derived, in particular,and->Is a correction coefficient.
Referring to fig. 2, 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 invention; comprising the following steps:
step S141, inversely transforming to calculate a transformation matrix TM2 from the LED display screen picture color gamut (X2, Y2, Z2) shot by the camera to the tristimulus values (X, Y, Z);
step S142, superposing the conversion matrix TM2 to 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 other alternative embodiments, the matching relationship among the target color gamut (X1, Y1, Z1), the tristimulus values (X, Y, Z), and the conversion matrix TM2 is as follows:
wherein,the correction coefficient in the matching relation is used.
By the color gamut matching method for film and television shooting, the finally obtained conversion matrix TM2 is overlapped to a signal source or an LED display screen for color and conversion, the LED display screen completes color gamut output, and the color gamut of an image obtained after shooting by a camera meets the requirements of projection or retransmission.
Referring to fig. 3, fig. 3 is a schematic diagram of a color gamut matching system for film and video shooting according to another embodiment of the present invention; the color gamut matching system 10 for film and television shooting includes:
an LED display screen 20 for displaying a picture required for film 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 achieves brightness and consistent color gamut;
an XR camera 40 for film shooting;
a terminal display device 30 for displaying a photographed picture of the XR camera;
the color gamut acquisition module 50 is configured to acquire the color gamut of the captured image of the LED display screen 20;
the XR camera 40 is connected to the terminal display device 30 and transmits a photographed picture; the LED display 20 and the color gamut acquisition module 50 are connected with 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 20 after calculation; the color gamut matching system 10 for film and video shooting is used to implement the color gamut matching method for film and video shooting described in any of the above embodiments.
In other alternative embodiments, the LED control module 60 further includes: a signal conversion unit 61 for converting the signal received from the signal transmission unit into data that can be matrix-calculated; the matrix calculation unit 62 is used for calculating the data capable of performing matrix calculation. In particular, the signal conversion unit may be, but is not limited to, a signal source or a signal generator.
The gamut acquisition module 50 further includes: the signal sending unit 51 is configured to convert the collected color gamut information into a signal and transmit the signal to the LED control module; the color gamut judging unit 52 is used for judging whether the color gamut reaches the required value.
In some alternative embodiments, the LED display 20 includes, but is not limited to, a Mini LED or Micro LED display. The color gamut collecting module 50 is configured to directly collect color gamut information for the terminal display device 30 and/or the XR camera, specifically, when the color gamut matching system 10 for film and television shooting performs step S110 in fig. 1, the color gamut collecting module 50 directly collects the color gamut of the LED display screen 20, and performs point-by-point correction; while performing step S130 in fig. 1, the color gamut capturing module 50 may directly capture color gamut information captured on the XR camera 40 or perform color gamut calculation by capturing the color gamut of the played image on the terminal display device 30. For example, the color gamut information captured on the XR camera 40 may be captured by an oscilloscope, and for the end display device 30, the color gamut of its playback image may be captured by an optical gun.
According to the color gamut matching system for film and television shooting, the conversion matrix TM2 is finally obtained through forward and reverse conversion calculation, the conversion matrix TM2 is finally overlapped on the LED display screen, display color gamut output is completed, the obtained image meets the projection standard through equipment shooting, the steps are convenient and quick, and the efficiency of film and television shooting later-period manufacturing is improved.
An embodiment of the present invention also 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 film and television capturing described in any of the above embodiments.
The components/modules/units of the system/computer apparatus integration, if implemented as software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on this understanding, the present invention may also be implemented by implementing all or part of the flow of the method of the above embodiment, or by instructing the relevant hardware by a computer program, where the computer program may be stored on a computer readable storage medium, and where the computer program, when executed by a processor, may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, 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, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.
The invention is not a matter of the known technology.
In the several embodiments provided herein, it should be understood that the disclosed systems and methods may be implemented in other ways. For example, the system embodiments described above are merely illustrative, e.g., the division of the components is merely a logical functional division, and additional divisions may be implemented in practice.
In addition, each functional module/component in the embodiments of the present invention may be integrated in the same processing module/component, or each module/component may exist alone physically, or two or more modules/components may be integrated in the same module/component. The integrated modules/components described above may be implemented in hardware or in hardware plus software functional modules/components.
It will be evident to those skilled in the art that the embodiments of the 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 characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of 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 evident that the word "comprising" does not exclude other elements or steps, and that the singular does not exclude a plurality. A plurality of units, modules or means recited in a system, means or terminal claim may also be implemented by means of software or hardware by means of one and the same unit, module or means. The terms first, second, etc. are used to denote a name, but not any particular order.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (7)
1. The color gamut matching method for film and television shooting is characterized by comprising the following steps:
correcting the LED display screen point by point to be a target color gamut (X1, Y1, Z1) through a color gamut corrector;
judging whether the color gamut is a target color gamut, namely judging whether the brightness and the chromaticity of the corrected LED display screen are consistent;
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;
solidifying the conversion matrix TM1 to each lamp of the LED display screen to finish the target display color gamut conversion of the LED display screen;
performing real-time color gamut conversion adjustment on the LED display screen according to the color gamuts (X2, Y2 and Z2) of the LED display screen shot by the acquisition camera; the inverse transformation calculates a transformation matrix TM2 from the LED display screen picture color gamut (X2, Y2, Z2) 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 performing color gamut conversion on the LED display screen to finish color gamut output.
2. A color gamut matching system for film and television photography, comprising:
the LED display screen is used for displaying pictures required by film 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 the color gamut is consistent;
an XR camera for shooting film and television;
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 a shooting picture; 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 carries out color gamut adjustment on the LED display screen after calculation; the color gamut matching system for film and television shooting is used for implementing the color gamut matching method for film and television shooting of claim 1.
3. The film and television capture color gamut matching system of claim 2, wherein the LED display screen comprises a Mini LED or Micro LED display screen.
4. The film and television capture color gamut matching system of claim 3, wherein the color gamut acquisition module further comprises:
the signal sending unit is used for converting the collected color gamut information into signals and transmitting the signals to the LED control module;
and the color gamut judging unit is used for judging whether the color gamut reaches a required value.
5. The video camera color gamut matching system according to claim 4, wherein the LED control module further comprises
A signal conversion unit for converting the signal received from the signal transmission unit into data that can be matrix-calculated;
and the matrix calculation unit is used for calculating the data capable of performing matrix calculation.
6. The video capture gamut matching system of claim 5, wherein the gamut acquisition module is configured to acquire gamut information directly for the end display device and/or the XR camera.
7. 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 film and television capturing of claim 1.
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