CN115456894A - Video production color correction method, device, equipment and storage medium - Google Patents
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Abstract
The embodiment of the invention relates to a video production color correction method, a video production color correction device, video production color correction equipment and a storage medium. The method comprises the following steps: acquiring a color correction material corresponding to a video shooting site; the color correction material comprises a color correction image which is set to be shot in a video shooting site and comprises a color test card; extracting a preset number of reference color values from the color test cards in the color correction image in response to a user's operation; generating color conversion parameters by taking all the reference color values as sources and taking the color values of the standard ACEScg color cards as targets; and rendering an original video material corresponding to a video shooting site according to the color conversion parameters so as to perform color correction on the original video material. The technical scheme of the embodiment of the invention can help a manufacturer to complete color matching of the same scene.
Description
Technical Field
The invention relates to the technical field of computer animation, in particular to a video production color correction method, a video production color correction device, video production color correction equipment and a storage medium.
Background
In the video production process, it is usually necessary to match the colors of all real shots in a scene, and produce CG (Computer Graphics) elements on the basis of the matched colors.
The operation of matching all shots of the same scene to similar color tendencies is usually adjusted manually by a Digital Intermediate (DI) department or a composition department of Visual Effects (VFX), sometimes with inefficient and inaccurate matching of colors. Therefore, a color correction method is needed to help the manufacturer to complete the color matching of the same scene.
Disclosure of Invention
The invention provides a video production color correction method, a video production color correction device, video production color correction equipment and a video production color correction storage medium, and aims to help a producer complete color matching of the same scene.
In a first aspect, an embodiment of the present invention provides a video production color correction method, including:
acquiring a color correction material corresponding to a video shooting site; the color correction material comprises a color correction image, and the color correction image is set to be shot in a video shooting site and comprises a color test card;
extracting a preset number of reference color values from the color test cards in the color correction image in response to a user's operation;
generating color conversion parameters by taking all the reference color values as sources and taking the color values of the standard ACEScg color cards as targets;
and rendering an original video material corresponding to a video shooting site according to the color conversion parameters so as to perform color correction on the original video material.
In a second aspect, an embodiment of the present invention provides a video production color correction apparatus, including:
the color correction material acquisition module is used for acquiring a color correction material corresponding to a video shooting site; the color correction material comprises a color correction image, and the color correction image is set to be shot in a video shooting site and comprises a color test card;
a reference color value extraction module, configured to extract a preset number of reference color values from the color test cards in the color correction image in response to a user operation;
the color conversion parameter generation module is used for generating color conversion parameters by taking all the reference color values as sources and taking the color values of the standard ACEScg color card as targets;
and the video color correction module is used for rendering an original video material corresponding to a video shooting site according to the color conversion parameters so as to perform color correction on the original video material.
In a third aspect, an embodiment of the present invention provides an electronic device, including:
one or more processors;
a memory for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement a method for video production color correction as provided by any of the embodiments of the invention.
In a fourth aspect, embodiments of the present invention provide a storage medium containing computer-executable instructions for performing a video production color correction method as provided by any of the embodiments of the present invention when executed by a computer processor.
According to the video production color correction method, the video production color correction device, the video production color correction equipment and the video production color correction storage medium, the reference color value in the field-shot color correction material is converted into the color value of the standard ACEScg color card, the color conversion parameter is obtained, and the color correction is carried out on the original video material. The problems that manual color adjustment is not high in efficiency and not accurate enough are solved, and manufacturing efficiency and correctness are improved.
Drawings
Fig. 1 is a flowchart of a video production color correction method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a video production color correction apparatus according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of an electronic device according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a video production color correction method according to an embodiment of the present invention, where this embodiment is applicable to a case of producing a computer-driven video effect, and the method can be executed by a video production color correction apparatus, where the apparatus can be implemented by hardware and/or software, and can be generally integrated in an electronic device, such as a computer device, and the method specifically includes:
and step 110, acquiring a color correction material corresponding to a video shooting site.
The color correction material comprises a color correction image, and the color correction image is set to be shot in a video shooting site and comprises a color test card. That is, there is a color test card shot on site in the color correction image. Color corrected images are typically acquired before or after a shot is taken, with a color test card in the picture for later use in post-production. The color test card is a ColorChecker test card and comprises a preset number of pure color blocks, wherein the pure color blocks can be six-level gray color blocks, additive three primary colors (red, green and blue), subtractive three primary colors (yellow, magenta and cyan) and skin colors and real colors for simulating natural objects, and the standard plate comprises 24 pure color blocks; the color corrected image may also have gray spheres in the picture, which are reflective 18% neutral gray spheres used mainly to determine exposure value, light ratio, white balance, etc. The color correction material may be pre-stored locally on the computer, or may be retrieved locally from a server.
The color test card is provided with a preset pure color block, and the pure color block in the color test card shot on site is recorded in the color correction image. Reference color values for each pure color block in the color corrected image need to be extracted.
And step 130, generating color conversion parameters by taking all the reference color values as sources and the color values of the standard ACEScg color card as targets.
Among them, ACES (academic Color Encoding System) is a free, open, device-independent Color management and image exchange System developed by the american college of motion picture arts and sciences and industry partners. In order to be able to correct colors, a standard acesg (ACES computer animation) color card is set in advance, and color values in ACES color space in the standard acesg color card are used as standards. Color conversion parameters from the reference color value to color values of a standard ACEScg color card are determined. Since the color test card can be a 24-color test card with 4 rows and 6 columns, which can be represented by a color matrix, and accordingly, the color value of the standard acesg color card can also be represented by a corresponding color matrix, we need to calculate a conversion color matrix for converting the color matrix of the color test card to the color matrix of the standard acesg color card as the color conversion parameter.
And 140, rendering an original video material corresponding to the video shooting site according to the color conversion parameters so as to perform color correction on the original video material.
The method comprises the steps of utilizing color conversion parameters to correct colors of an original video material, and rendering a sequence frame after color correction.
According to the technical scheme, the reference color value in the field-shot color correction material is converted into the color value of the standard ACEScg color card, so that the color conversion parameter is obtained, and the color correction is performed on the original video material. The problems that manual color adjustment is not high in efficiency and not accurate enough are solved, and manufacturing efficiency and correctness are improved. In addition, the process and the whole post-stage visual effect production process are carried out in the ACES wide color gamut, so that high color consistency can be ensured, the color is not lost in the matching and processing process, and the illumination and the color of the physical world are really restored.
Optionally, the obtaining of the color correction material corresponding to the video shooting site includes:
searching a material storage position of a video shooting site corresponding to the movie item name and the lens number from a server according to the movie item name and the lens number input by a user;
color correction material is extracted from the material storage location.
The color correction material can be released (published) to the server through a visual effect company, so that the color correction material stored in the corresponding path of the server can be quickly searched through the name of a video item and the lens number. The user can input the item name and the lens number in the Search window respectively, and then click the "Search" button to Search the files on the server, and the Search result is displayed in the interface. Sometimes, more than one gray ball card material is shot for the same lens.
Optionally, in response to a user operation, extracting a preset number of reference color values from the color test cards in the color correction image includes:
importing the color corrected image into a color extraction tool;
according to the operation of a user, moving the four color test card fixing sites to four corners of a color test card in a color correction image in a one-to-one correspondence manner, so that 24 color extraction color blocks fall into the real shooting color block range of the corresponding color test card; wherein, the color test card is a 24-color test card with 4 rows and 6 columns;
and extracting 24 reference color values from the real-shot color blocks of the color test card according to preset 24-color test card parameters.
The color test card is a 24-color test card with 4 rows and 6 columns, a color correction image is led into a color extraction tool, for example, the color correction image is led into Nuke software, after a node of 'mmColorTarget' is created, four color test card fixing positions and 24 color extraction color blocks are arranged on a view interface of the software, and the relative positions of the color test card fixing positions and the color extraction color blocks can be determined in advance according to the arrangement of pure color blocks in the color test card. Each color test card fixing site corresponds to one corner of the color test card, and the color test card fixing site is moved to one corner of the corresponding color test card through the dragging operation of a user. Therefore, the four color test card fixing sites can determine the edge positions of the color test cards in the color correction image, so that the arrangement positions of 24 pure color blocks in 4 rows and 6 columns in the color test cards in the image can be determined, and the 24 color extraction color blocks fall into the real color block range of the corresponding color test card.
Optionally, the generating of the color conversion parameter by using the color value of the standard ACEScg color card as a target and using all reference color values as a source includes:
generating a reference color matrix from the 24 reference color values;
generating a target color matrix according to the color value of the standard ACEScg color card;
and calculating a regression coefficient for converting the source matrix into the target matrix based on a least square method by taking the reference color matrix as a source matrix and the target color matrix as a target matrix, wherein the regression coefficient is used as a color conversion parameter.
Wherein, the reference color value is extracted from the real shooting color block of the color test card. The color space is then set to ACEScg. The user executes the operation of generating the color matrix, and for a 24-color test card, the generation of the conversion color matrix needs two groups of 24 × 3 × 3 × 3 matrixes to be calculated, one group is the color value of the color test card in the picture as a source, the other group is the color value of the standard ACEScg color card as a target, and a least square method is used for solving a regression coefficient, namely the 3 × 3 conversion color matrix used for converting the source matrix into the value close to the target matrix.
Optionally, the method for rendering the original video material corresponding to the video shooting site according to the color conversion parameter to perform color correction on the original video material includes:
and performing color correction on the sequence frames in the original video material according to the regression coefficient, and outputting the sequence frames after the color correction.
Optionally, before rendering an original video material corresponding to a video shooting site according to the color conversion parameter, the method further includes:
and uploading the color conversion parameters to a server, and connecting the color conversion parameters with the original video material stored on the server.
The 3 × 3 conversion color matrix corresponding to the video shooting site can be recorded, for example, a node is established in software, and data is stored in the node. The node is connected below the original video material to indicate that the original video material is subjected to color correction and can be used by a downstream link.
Optionally, after rendering an original video material corresponding to a video shooting site according to the color conversion parameter to perform color correction on the original video material, the method further includes:
and uploading the original video material after color correction to a server.
When color correction is performed on all real-shot original video materials, the color correction needs to be issued to a server for downstream use. The generated conversion color matrix can be used as a node to be issued to a server, a 'Write' node is automatically created below the conversion color matrix, and the sequence frame after color correction is rendered and issued to the server to be used by a manufacturer of a downstream link.
Example two
Fig. 2 is a schematic structural diagram of a video production color correction apparatus according to a second embodiment of the present invention, and as shown in fig. 2, the video production color correction apparatus includes: a color correction material acquisition module 210, a reference color value extraction module 220, a color conversion parameter generation module 230, and a video color correction module 240, wherein,
a color correction material obtaining module 210, configured to obtain a color correction material corresponding to a video shooting site; the color correction material comprises a color correction image which is set to be shot in a video shooting site and comprises a color test card;
a reference color value extracting module 220 for extracting a preset number of reference color values from the color test cards in the color correction image in response to a user's operation;
a color conversion parameter generating module 230, configured to generate a color conversion parameter by using all reference color values as sources and using color values of a standard ACEScg color card as targets;
and the video color correction module 240 is configured to render an original video material corresponding to the video shooting site according to the color conversion parameter, so as to perform color correction on the original video material.
Optionally, the color correction material obtaining module 210 is specifically configured to:
searching a material storage position of a video shooting site corresponding to the movie item name and the lens number from a server according to the movie item name and the lens number input by a user;
color correction material is extracted from the material storage location.
Optionally, the reference color value extracting module 220 is specifically configured to:
importing the color corrected image into a color extraction tool;
according to the operation of a user, moving the four color test card fixing sites to four corners of a color test card in a color correction image in a one-to-one correspondence manner, so that 24 color extraction color blocks fall into the real shooting color block range of the corresponding color test card; wherein, the color test card is a 24-color test card with 4 rows and 6 columns;
and extracting 24 reference color values from the real shooting color blocks of the color test card according to preset 24-color test card parameters.
Optionally, the color conversion parameter generating module 230 is specifically configured to:
generating a reference color matrix from the 24 reference color values;
generating a target color matrix according to the color value of the standard ACEScg color card;
and calculating a regression coefficient for converting the source matrix into the target matrix based on a least square method by taking the reference color matrix as a source matrix and the target color matrix as a target matrix, wherein the regression coefficient is used as a color conversion parameter.
Optionally, the video color correction module 240 is specifically configured to:
and according to the regression coefficient, performing color correction on the sequence frame in the original video material, and outputting the sequence frame after the color correction.
Optionally, the video production color correction apparatus further includes:
and the parameter material connection module is used for uploading the color conversion parameters to the server before rendering the original video material corresponding to the video shooting site according to the color conversion parameters, and connecting the color conversion parameters with the original video material stored on the server.
Optionally, the video production color correction apparatus further includes:
and the color correction material uploading module is used for rendering the original video material corresponding to the video shooting site according to the color conversion parameters so as to perform color correction on the original video material and then uploading the color-corrected original video material to the server.
The video production color correction device provided by the embodiment of the invention can execute the video production color correction method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
EXAMPLE III
Fig. 3 is a schematic structural diagram of an electronic device according to a third embodiment of the present invention, as shown in fig. 3, the electronic device includes a processor 310, a memory 320, an input device 330, and an output device 340; the number of the processors 310 in the electronic device may be one or more, and one processor 310 is taken as an example in fig. 3; the processor 310, the memory 320, the input device 330 and the output device 340 in the electronic apparatus may be connected by a bus or other means, and the connection by the bus is exemplified in fig. 3.
The memory 320 serves as a computer-readable storage medium for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the video production color correction method in the embodiment of the present invention (for example, the color correction material acquisition module 210, the reference color value extraction module 220, the color conversion parameter generation module 230, and the video color correction module 240 in the video production color correction apparatus). The processor 310 executes various functional applications and data processing of the electronic device by executing software programs, instructions and modules stored in the memory 320, so as to implement the video production color correction method described above.
The memory 320 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 320 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 320 may further include memory located remotely from the processor 310, which may be connected to the electronic device through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 330 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the electronic apparatus. The output device 340 may include a display device such as a display screen.
Example four
A fourth embodiment of the present invention further provides a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform a video production color correction method, including:
acquiring a color correction material corresponding to a video shooting site; the color correction material comprises a color correction image which is set to be shot in a video shooting site and comprises a color test card;
extracting a preset number of reference color values from the color test cards in the color correction image in response to a user's operation;
generating color conversion parameters by taking all the reference color values as sources and taking the color values of the standard ACEScg color cards as targets;
and rendering an original video material corresponding to a video shooting site according to the color conversion parameters so as to perform color correction on the original video material.
Of course, the storage medium provided by the embodiments of the present invention contains computer-executable instructions, and the computer-executable instructions are not limited to the method operations described above, and may also perform related operations in the video production color correction method provided by any embodiments of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the embodiment of the video production color correction apparatus, the units and modules included in the embodiment are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be implemented; in addition, the specific names of the functional units are only for the convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
Although the invention has been described in detail hereinabove by way of general description, specific embodiments and experiments, it will be apparent to those skilled in the art that many modifications and improvements can be made thereto based on the invention. Accordingly, it is intended that all such modifications and alterations be included within the scope of this invention as defined in the appended claims.
Claims (10)
1. A method for video production color correction, comprising:
acquiring a color correction material corresponding to a video shooting site; the color correction material comprises a color correction image, and the color correction image is set to be shot in a video shooting site and comprises a color test card;
extracting a preset number of reference color values from the color test cards in the color correction image in response to a user's operation;
generating color conversion parameters by taking all the reference color values as sources and taking the color values of the standard ACEScg color cards as targets;
and rendering an original video material corresponding to a video shooting site according to the color conversion parameters so as to perform color correction on the original video material.
2. The method according to claim 1, wherein the obtaining of the color correction material corresponding to the video shooting scene comprises:
searching a material storage position of a video shooting site corresponding to a video item name and a lens number from a server according to the video item name and the lens number input by a user;
the color correction material is extracted from the material storage location.
3. The method of claim 1, wherein said extracting a preset number of reference color values from the color test cards in the color corrected image in response to a user operation comprises:
importing the color corrected image into a color extraction tool;
according to the operation of a user, moving four color test card fixing positions to four corners of the color test card in the color correction image in a one-to-one correspondence mode so that 24 color extraction color blocks fall into the real shooting color block range of the corresponding color test card; wherein, the color test card is a 24-color test card with 4 rows and 6 columns;
and extracting 24 reference color values from the real-shot color blocks of the color test card according to preset 24-color test card parameters.
4. The method of claim 3, wherein generating color conversion parameters using all of the reference color values as a source and color values of a standard ACEScg color card as a target comprises:
generating a reference color matrix from the 24 reference color values;
generating a target color matrix according to the color value of the standard ACEScg color card;
and taking the reference color matrix as a source matrix, taking the target color matrix as a target matrix, and calculating a regression coefficient for converting the source matrix into the target matrix based on a least square method to be used as the color conversion parameter.
5. The method of claim 4, wherein the rendering of raw video material corresponding to a video shot according to the color conversion parameters for color correction of the raw video material comprises:
and according to the regression coefficient, carrying out color correction on the sequence frame in the original video material, and outputting the sequence frame after the color correction.
6. The method of claim 1, further comprising, prior to said rendering raw video material corresponding to a video capture scene according to the color conversion parameters:
and uploading the color conversion parameters to a server, and connecting the color conversion parameters with the original video material stored on the server.
7. The method of claim 6, wherein after the rendering raw video material corresponding to a video shot according to the color conversion parameters for color correction of the raw video material, further comprising:
uploading the raw video material after color correction to the server.
8. A video production color correction apparatus, comprising:
the color correction material acquisition module is used for acquiring a color correction material corresponding to a video shooting site; the color correction material comprises a color correction image, and the color correction image is set to be shot in a video shooting site and comprises a color test card;
a reference color value extraction module, configured to extract a preset number of reference color values from the color test cards in the color correction image in response to a user operation;
the color conversion parameter generation module is used for generating color conversion parameters by taking all the reference color values as sources and taking the color values of the standard ACEScg color card as targets;
and the video color correction module is used for rendering an original video material corresponding to a video shooting site according to the color conversion parameters so as to perform color correction on the original video material.
9. An electronic device, comprising:
one or more processors;
a memory for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the video production color correction method of any of claims 1-7.
10. A storage medium containing computer-executable instructions for performing the video production color correction method of any of claims 1-7 when executed by a computer processor.
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| 彼得•科普: "《数码摄像曝光手边书》", 中国摄影出版社, pages: 47 * |
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