WO2023016037A1 - Video processing method and apparatus, electronic device, and storage medium - Google Patents

Abstract

Provided in the embodiments of the present application are a video processing method and apparatus, an electronic device, and a storage medium, relating to the technical field of video capturing, and allowing for videos captured by an electronic device to have different style effects based on the characteristics of a LUT, so as to meet higher toning requirements. The video processing method comprises: determining one video style template from among a plurality of video style templates, each video style template corresponding to a preset color lookup table (LUT); obtaining a video captured by a camera; converting the video captured by the camera being into a video having a wide-gamut color space; processing the video having a wide-gamut color space by means of a log curve corresponding to a current photosensitivity ISO of the camera to obtain a log video; and processing the log video on the basis of the LUT corresponding to the determined video style template to obtain a video corresponding to the determined video style template.

Description

Video processing method, device, electronic device and storage medium

This application claims the priority of a Chinese patent application with application number 202110925241.7 and application title "Video Processing Method, Device, Electronic Device, and Storage Medium" filed with the China Patent Office on August 12, 2021, the entire contents of which are incorporated by reference in this application.

technical field

The present application relates to the technical field of video shooting, and in particular to a video processing method, device, electronic equipment and storage medium.

Background technique

With the development of technology, users have higher and higher requirements for the effect and style of videos shot by terminals such as mobile phones. However, the filters used for shooting videos in current mobile phones usually follow the filter principle in camera mode. The video processed by the filter cannot meet the high color grading requirements.

Contents of the invention

A video processing method, device, electronic equipment, and storage medium, which can make videos captured by electronic equipment have different style effects based on the characteristics of LUTs, so as to meet higher color matching requirements.

In the first aspect, a video processing method is provided, including: determining a video style template among a plurality of video style templates, each video style template corresponding to a preset color lookup table LUT; obtaining a video taken by a camera; The video shot by the camera is converted into a video in a wide color gamut color space; the video in a wide color gamut color space is processed through the logarithmic LOG curve corresponding to the current sensitivity ISO of the camera to obtain a LOG video; based on the determined video The LUT corresponding to the style template processes the LOG video to obtain the video corresponding to the determined video style template.

In a possible implementation manner, the video in the color space of the wide color gamut is processed through the logarithmic LOG curve corresponding to the current sensitivity ISO of the camera, and the process of obtaining the LOG video includes: if the color space of the wide color gamut If the linear region data of the video is greater than the preset value cut, the linear region data of the video in the color space of the wide color gamut is converted according to the formula c×log ₁₀ (a×x+b)+d, wherein, cut, c, a and b are LOG curve parameters, and x is the linear area data of the video in the color space of the wide color gamut before conversion; if the linear area data of the video in the color space of the wide color gamut is not greater than the preset value cut, then according to the formula e× x+f converts the linear region data of the video in the wide color gamut color space, where e and f are LOG curve parameters.

In a possible implementation manner, the process of converting the video captured by the camera into a video in a wide color gamut color space includes: converting the video captured by the camera into a video in a wide color gamut color space through a color correction matrix CCM ;

M is a preset compensation matrix.

In a possible implementation manner, before the process of processing the LOG video based on the LUT corresponding to the determined video style template to obtain the video corresponding to the determined video style template, it also includes: converting the LOG video by RGB color The LOG video in the space is converted into the LOG video in the YUV color space; the YUV denoising process is performed on the LOG video in the YUV color space to obtain the denoised LOG video. Since the LOG video obtained by processing the video through the LOG curve will introduce noise, it is possible to convert the LOG video to the YUV color space, perform YUV denoising processing, and use an algorithm to reduce noise to improve the video image quality.

In a possible implementation manner, before the process of processing the LOG video based on the LUT corresponding to the determined video style template to obtain the video corresponding to the determined video style template, it also includes: denoising the LOG Video is converted into the LOG video of RGB color space by the LOG video of YUV color space; After the LUT corresponding to the LOG video is processed based on the determined video style template, after obtaining the process of video corresponding to the determined video style template, also Including: converting the video corresponding to the determined video style template in the RGB color space to the video in the YUV color space.

In a possible implementation manner, before the process of processing the LOG video based on the LUT corresponding to the determined video style template to obtain the video corresponding to the determined video style template, the method further includes: saving the LOG video. Saving the LOG video without LUT processing can improve the ability of post-editing.

In a possible implementation manner, before the process of processing the LOG video based on the LUT corresponding to the determined video style template to obtain the video corresponding to the determined video style template, it also includes: converting the LOG video into Rec .709 color standard video; save Rec.709 color standard video.

In a possible implementation manner, in the first video processing flow, the process of processing the video captured by the camera through the logarithmic LOG curve to obtain the LOG video, and the LUT corresponding to the LOG based on the determined video style template The video is processed to obtain the process of video corresponding to the determined video style template; the video processing method also includes a second video processing flow, and the second video processing flow includes: processing the video taken by the camera through a logarithmic LOG curve, Obtain the LOG video; Process the LOG video based on the LUT corresponding to the determined video style template to obtain a video corresponding to the determined video style template; the video processing method also includes: combining the first video processing flow with the determined video The video corresponding to the style template is saved; and the video corresponding to the determined video style template is previewed based on the second video processing flow. Perform LUT processing on the video to be saved in the first video processing flow, and perform LUT processing on the video to be previewed in the second video processing flow, so that the preview video and the final video have the same visual effect, which is convenient for users Video preview based directly on the graded look.

In a second aspect, a video processing device is provided, including: a processor and a memory, the memory is used to store at least one instruction, and when the instruction is loaded and executed by the processor, the above video processing method is realized.

In a third aspect, an electronic device is provided, including: a camera; and the above-mentioned video processing device.

In a fourth aspect, a computer-readable storage medium is provided. A computer program is stored in the computer-readable storage medium, and when running on a computer, the computer is made to execute the above video processing method.

The video processing method, device, electronic equipment, and storage medium in the embodiments of the present application use the LUT technology in the film industry to process the LOG video based on the LUT corresponding to the determined video style template during the video recording process, so that the recorded The video has the style effect corresponding to the determined video style template, so as to meet the higher color grading requirements and make the recorded video have a movie feel. And because the LOG video is obtained after video processing based on the wide color gamut color space, the characteristics of the LOG curve can be more effectively used to record more information captured by the camera sensor, further improving the video recording effect.

Description of drawings

FIG. 1 is a structural block diagram of an electronic device in an embodiment of the present application;

FIG. 2 is a flowchart of a video processing method in an embodiment of the present application;

FIG. 3 is a schematic diagram of a user interface in a movie mode in an embodiment of the present application;

Fig. 4 is the schematic diagram of a kind of LOG curve in the embodiment of the present application;

Fig. 5 is a kind of specific flow diagram of step 104 in Fig. 2;

6 is a schematic diagram of the relationship between a cube and a tetrahedron in a cube interpolation space in an embodiment of the present application;

FIG. 7 is a flowchart of another video processing method in the embodiment of the present application;

Fig. 8 is a UV plane schematic diagram;

FIG. 9 is another structural block diagram of an electronic device in the embodiment of the present application;

FIG. 10 is a software structural block diagram of an electronic device in an embodiment of the present application;

FIG. 11 is a schematic diagram of a user interface in a professional mode in an embodiment of the present application.

Detailed ways

The terms used in the embodiments of the present application are only used to explain specific embodiments of the present application, and are not intended to limit the present application.

Before introducing the embodiment of the present application, the electronic device involved in the embodiment of the present application is first introduced. As shown in FIG. 1 , the electronic device 100 may include a processor 110, a camera 193, a display screen 194, and the like. It can be understood that, the structure illustrated in the embodiment of the present invention does not constitute a specific limitation on the electronic device 100 . In other embodiments of the present application, the electronic device 100 may include more or fewer components than shown in the figure, or combine certain components, or separate certain components, or arrange different components. The illustrated components can be realized in hardware, software or a combination of software and hardware.

The processor 110 may include one or more processing units, for example: the processor 110 may include a graphics processing unit (graphics processing unit, GPU), an image signal processor (image signal processor, ISP), a controller, a video codec, Digital signal processor (digital signal processor, DSP), etc. Wherein, different processing units may be independent devices, or may be integrated in one or more processors. The controller can generate an operation control signal according to the instruction opcode and timing signal, and complete the control of fetching and executing the instruction. A memory may also be provided in the processor 110 for storing instructions and data.

The electronic device 100 realizes the display function through the GPU, the display screen 194 , and the application processor. The GPU is a microprocessor for image processing, and is connected to the display screen 194 and the application processor. GPUs are used to perform mathematical and geometric calculations for graphics rendering. Processor 110 may include one or more GPUs that execute program instructions to generate or change display information.

The electronic device 100 can realize the shooting function through the ISP, the camera 193 , the video codec, the GPU, the display screen 194 and the application processor.

The ISP is used for processing the data fed back by the camera 193 . For example, when taking a picture, open the shutter, the light is transmitted to the photosensitive element of the camera through the lens, and the light signal is converted into an electrical signal, and the photosensitive element of the camera transmits the electrical signal to the ISP for processing, and converts it into an image visible to the naked eye. ISP can also perform algorithm optimization on image noise, brightness, and skin color. ISP can also optimize the exposure, color temperature and other parameters of the shooting scene. In some embodiments, the ISP may be located in the camera 193 .

Camera 193 is used to capture still images or video. The object generates an optical image through the lens and projects it to the photosensitive element. The photosensitive element may be a charge coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) phototransistor. The photosensitive element converts the light signal into an electrical signal, and then transmits the electrical signal to the ISP to convert it into a digital image signal. The ISP outputs the digital image signal to the DSP for processing. DSP converts digital image signals into standard RGB, YUV and other image signals. In some embodiments, the electronic device 100 may include 1 or N cameras 193 , where N is a positive integer greater than 1.

Digital signal processors are used to process digital signals. In addition to digital image signals, they can also process other digital signals. For example, when the electronic device 100 selects a frequency point, the digital signal processor is used to perform Fourier transform on the energy of the frequency point.

Video codecs are used to compress or decompress digital video. The electronic device 100 may support one or more video codecs. In this way, the electronic device 100 can play or record videos in various encoding formats, for example: moving picture experts group (moving picture experts group, MPEG) 1, MPEG2, MPEG3, MPEG4 and so on.

As shown in FIG. 2 , the embodiment of the present application provides a video processing method. The video processing method may be executed by a processor 110, specifically an ISP or a combination of an ISP and other processors. The video processing method includes:

Step 101, determine a video style template among a plurality of video style templates, each video style template corresponds to a preset color lookup table (Look Up Table, LUT);

Among them, the essence of LUT is a mathematical conversion model. Using LUT, one set of RGB values can be output as another set of RGB values, thereby changing the exposure and color of the picture. Therefore, LUTs corresponding to different video styles can be pre-generated. Before the electronic device records a video, a video style template can be determined first. For example, the video style template can be determined based on the user's choice, or based on artificial intelligence (Artificial Intelligence, AI), The video style template is automatically determined according to the scene corresponding to the image captured by the current camera. For example, assuming that the electronic device is a mobile phone, in a possible implementation, as shown in Figure 3, the user operates the mobile phone to enter the shooting interface, and the shooting interface includes movie mode options. In the movie mode interface of , including multiple video style template options, for example including "A" movie style template, "B" movie style template and "C" movie style template, only one " A "movie style template, understandably, multiple different movie style templates can be displayed side by side in the user interface, and the LUTs corresponding to different movie style templates can be generated based on the corresponding movie color matching style in advance, and the color conversion of the LUT has Corresponding to the style characteristics of the movie, for example, the color matching style of the movie "A" is complementary color. Complementary color refers to the contrast effect of two corresponding colors. Two colors of warm color and cool color are used to emphasize the contrast to enhance the vividness, For outstanding effects, usually two contrasting colors symbolize conflicting behaviors. Through the presentation of external complementary colors to express the character's inner conflict or exhausted state, the LUT corresponding to the "A" movie style template is ready to use After transforming the colormap, the complementary colors are more pronounced to simulate the color scheme of the "A" movie. In a possible implementation, as shown in Figure 3, when the user operates the mobile phone to enter the movie mode, the mobile phone will obtain the picture taken by the current camera, and based on the AI algorithm, determine the scene corresponding to the picture and determine the scene corresponding to the scene. The recommended video style template, for example, if it is recognized that the subject of the currently captured picture is a young female character, the corresponding recommended video style template is determined according to the algorithm as the "C" movie style template, and the movie "C" has a young female character as the theme movie, its corresponding LUT can simulate the color matching style of the movie "C"; It is a movie with city streets as the main scene, and its corresponding LUT can simulate the color matching style of the "B" movie. In this way, a video style template matching the current scene can be automatically recommended for the user. Film styles can be pre-extracted to produce LUTs suitable for mobile electronics.

Step 102, obtain the video shot by the camera, for example, after the video style template is determined in step 101, if the user clicks on the shooting option, the mobile phone starts to obtain the video shot by the camera;

Step 1020, converting the video captured by the camera into a video in a wide color gamut color space;

Step 103, process the video in the color space of the wide color gamut through the logarithm (Logarithm, LOG) curve corresponding to the current sensitivity ISO of the camera to obtain the LOG video;

Among them, the LOG curve is based on the scene, and the LOG curve is slightly different under different ISOs. As the ISO increases, the maximum value of the LOG curve also increases. When the ISO is increased to a certain level, the highlights will have a shoulder shape, keeping the highlights from being exposed. As shown in Figure 4, Figure 4 illustrates a LOG curve, where the abscissa is a linear signal, represented by a 16-bit code value Code Value, and the ordinate is the LOG signal processed by the LOG curve, represented by a 10-bit code value. Through LOG curve processing, the signal input of the camera can be used to encode the information in the dark area to the middle tone (as shown in the steep part of the curve in Figure 4), forming a 10-bit signal output, which conforms to the human eye's LOG sensing rule for light, and maximizes the The dark information is preserved, and the LOG video can use the limited bit depth to maximize the details of shadows and highlights. Since the video processed through the LOG curve in step 104 belongs to the wide color gamut color space, the characteristics of the LOG curve can be more effectively used to record more information captured by the camera sensor, so as to improve the video recording effect. The ASA in Figure 4 is the sensitivity, and different ASAs correspond to different ISOs, and the two belong to different systems.

Step 104: Process the LOG video based on the LUT corresponding to the determined video style template to obtain a video corresponding to the determined video style template.

Specifically, after the LOG video is obtained, the LOG video is used as an input, and the LUT corresponding to the video style template determined in step 101 is applied to perform mapping conversion processing on the LOG video image. The video corresponding to the video style template. After the LOG video is processed based on the LUT, the output can be the video of the Rec.709 color standard, or the video of the High-Dynamic Range (HDR) 10 standard, that is, the LOG video can be processed through the LUT, Convert video to HDR10 standard.

Different LUTs are applied to electronic equipment, and related modules in the electronic equipment can be adapted to adapt to different styles of LUTs. For example, if the video style template determined in step 101 is a gray tone video style template, the gray tone The characteristics of the picture are that the texture in the picture is strong, the saturation is low, there is no more color interference except for the color of the character's skin, and the dark part is cooler. Based on these characteristics, the electronic device can monitor the relevant Adjust the module parameters to keep the texture in the picture, do not do strong denoising and sharpening, properly reduce the saturation of the picture, keep the skin color in the picture true to restore, and adjust the dark part of the picture to cool colors.

In the video processing method in the embodiment of the present application, during the video recording process, the LUT technology of the film industry is used to process the LOG video based on the LUT corresponding to the determined video style template, so that the recorded video has the determined video style The style effect corresponding to the template can meet the higher color grading requirements and make the recorded video have a cinematic feel. And because the LOG video is obtained after video processing based on the wide color gamut color space, the characteristics of the LOG curve can be more effectively used to record more information captured by the camera sensor, further improving the video recording effect.

In a possible implementation manner, the above step 103 is to process the video in the color space of the wide color gamut through the logarithmic LOG curve corresponding to the current sensitivity ISO of the camera, and the process of obtaining the LOG video includes: if the wide color gamut The linear region data of the video in the color space of color space is greater than the preset value cut, then convert the linear region data of the video in the color space of the wide color gamut according to the formula c×log ₁₀ (a×x+b)+d, wherein, cut , c, a and b are LOG curve parameters, and x is the linear area data of the video in the color space of the wide color gamut before conversion; if the linear area data of the video in the color space of the wide color gamut is not greater than the preset value cut , then convert the linear region data of the video in the color space of the wide color gamut according to the formula e×x+f, where e and f are LOG curve parameters. The data in the linear region is the linear signal shown in FIG. 4 , that is, the input signal processed through the LOG curve is linear, and the output signal processed through the LOG curve is LOG. For a particular encoded image, cut, c, a, b, e, and f depend on the bit depth and exposure index of the linear region. Through the adaptation of the LOG curve, in the process of video processing, the dark part is stretched to the middle tone, and the bright part is protected from overexposure. In the limited dynamic range of the camera sensor, the maximum information is recorded to increase the efficiency of subsequent processing. space. Other processes can be adjusted according to the characteristics of the LOG curve, such as adjusting automatic exposure (Automatic Exposure, AE) parameters, color correction matrix (Color Correction Matrix, CCM) parameters, denoising parameters, sharpening parameters, etc.

In a possible implementation manner, the above step 1020, the process of converting the video captured by the camera into a video in a wide color gamut color space includes:

Convert the video captured by the camera into a video in a wide color gamut color space through the color correction matrix CCM;

M is a preset compensation matrix.

Specifically, the transformation matrix for converting from the wide color gamut RGB color space to the XYZ color space is:

The conversion matrix from the XYZ color space to the standard RGB color space sRGB' is:

According to the above two conversion matrices, the above CCM can be obtained, where M is a 3×3 matrix related to the camera sensor, which is color-corrected to compensate for the difference in color response between the human eye and the camera sensor. This matrix can be obtained by The corresponding tools are obtained through image-specific calibration.

In a possible implementation manner, as shown in FIG. 5, the process of processing the LOG video based on the LUT corresponding to the determined video style template in the above step 104, and obtaining the video corresponding to the determined video style template includes:

Step 1041, establish a cubic interpolation space based on the LUT, where the LUT is a three-dimensional 3D-LUT;

Among them, the implementation of 3D-LUT is carried out in the RGB domain. 3D-LUT is a color mapping relationship commonly used in the film industry. It can convert any input RGB pixel value into corresponding other RGB pixel values, such as inputting 12bit RGB Video image, output 12bit RGB video image after LUT processing and mapping. In step 1041, the entire RGB color space is evenly divided into cubes of eg 33×33×33, corresponding to the LUT, the side length step_size of each cube is eg 2 ^(12-5) =2 ⁷ .

Step 1042, determine the cube to which each pixel in the LOG video belongs in the cube interpolation space, and the cube is divided into 6 tetrahedrons;

Wherein, the LOG video is used as the input in the LUT processing process, and each pixel in the LOG video picture is obtained through the pixel point after the LUT processing mapping, which can realize the process of processing the LOG video through the LUT. In step 1042, it is necessary to Determine the cube to which each pixel in each input LOG video belongs to in the above cube interpolation space, and the cube is divided into 6 tetrahedrons.

Step 1043, determine the tetrahedron to which each pixel in the LOG video belongs;

Step 1044, for the pixel points corresponding to the vertices of the cube, the pixel value is converted into a pixel value after LUT processing, and for the pixel points not corresponding to the vertices of the cube, interpolation is performed according to the tetrahedron to which each pixel point belongs, and the pixel value is converted into The pixel value after LUT processing.

Specifically, for the input pixel point, if the pixel point is located at the vertex of the cube, according to the index of the vertex and the 3D-LUT, the mapped RGB pixel value can be directly obtained, that is, the pixel value can be directly mapped and converted into The corresponding pixel value, and if the pixel is located between the vertices of the cube, interpolate according to the tetrahedron to which the pixel belongs.

In a possible implementation, as shown in Figure 6, the cube has the 0th to 7th vertices, which are respectively represented by numbers 0 to 7 in Figure 6, and the direction from the 0th vertex to the first vertex is blue B The coordinate axis direction of the channel, the direction from the 0th vertex to the 4th vertex is the coordinate axis direction of the red R channel, the direction from the 0th vertex to the second vertex is the coordinate axis direction of the green G channel, the 0th vertex, the 1st vertex, The 2nd vertex and the 3rd vertex are located on the same plane, the 1st vertex, the 3rd vertex, the 5th vertex and the 7th vertex are located on the same plane, the 4th vertex, the 5th vertex, the 6th vertex and the 7th vertex are located on the same plane, and the 3rd vertex is located on the same plane. Vertex 0, Vertex 2, Vertex 4 and Vertex 6 are on the same plane; Vertex 0, Vertex 1, Vertex 5 and Vertex 7 form the first tetrahedron, Vertex 0, Vertex 1, Vertex 3 The vertex and the 7th vertex form the second tetrahedron, the 0th vertex, the 2nd vertex, the 3rd vertex and the 7th vertex form the third tetrahedron, the 0th vertex, the 4th vertex, the 5th vertex and the 7th vertex form For the fourth tetrahedron, the 0th vertex, the 4th vertex, the 6th vertex and the 7th vertex form the fifth tetrahedron, and the 0th vertex, the 2nd vertex, the 6th vertex and the 7th vertex form the sixth tetrahedron; Among them, the coordinates of the i-th vertex are (Ri, Gi, Bi), the value of i is 0, 1, 2, 3, ..., 7, and the pixel value of the i-th vertex after LUT processing is VE(Ri, Gi, Bi), wherein E is R, G and B;

In the above step 1044, for the pixel points that do not correspond to the vertices of the cube, interpolation is performed according to the tetrahedron to which each pixel point belongs, and the process of converting the pixel value into the pixel value processed by the LUT includes:

Generate the E channel pixel value VE(R, G, B) after LUT processing according to the current pixel point (R, G, B). Pixels to be interpolated;

VE(R, G, B)=VE(R0, G0, B0)+(delta_valueR_E×deltaR+delta_valueG_E×deltaG+delta_valueB_E×deltaB+(step_size>>1))/(step_size);

VE(R0, G0, B0) is the E channel pixel value of the 0th vertex (R0, G0, B0) after LUT processing, and E is R, G and B;

delta_valueR_E is the difference between the two vertices in the direction of the coordinate axis of the R channel corresponding to the tetrahedron to which the current pixel belongs, and the difference between the pixel values of the E channel after LUT processing. The difference between the pixel values of the E channel after the LUT processing of each vertex, delta_valueB_E is the difference between the pixel values of the E channel after the LUT processing of two vertices in the direction of the coordinate axis of the tetrahedron to which the current pixel belongs corresponding to the B channel;

deltaR is the difference between the R value in the current pixel point (R, G, B) and the R0 value in the 0th vertex (R0, G0, B0), and deltaG is the G value in the current pixel point (R, G, B). The difference between the G0 value and the 0th vertex (R0, G0, B0), deltaB is the difference between the B value in the current pixel point (R, G, B) and the B0 value in the 0th vertex (R0, G0, B0). Difference;

step_size is the side length of the cube.

Among them, >> represents the right shift operation, (step_size>>1) means step_size is shifted to the right by one bit.

Specifically, for example, for the input current pixel point (R, G, B), calculate deltaR, deltaG and deltaB, deltaR, deltaG and deltaB represent the distance between the current pixel point (R, G, B) and the 0th vertex, deltaR =R-R0, deltaG=G-G0, deltaB=B-B0, in the above step 1043, it can be determined which tetrahedron the current pixel belongs to according to the relationship among deltaR, deltaG and deltaB. If deltaB≥deltaR and deltaR≥deltaG, determine that the current pixel belongs to the first tetrahedron; if deltaB≥deltaG and deltaG≥deltaR, determine that the current pixel belongs to the second tetrahedron; if deltaG≥deltaB and deltaB≥deltaR , it is determined that the current pixel point belongs to the third tetrahedron; if deltaR≥deltaB and deltaB≥deltaG, then it is determined that the current pixel point belongs to the fourth tetrahedron; if deltaR≥deltaG and deltaG≥deltaB, then it is determined that the current pixel point belongs to the fourth tetrahedron Five tetrahedrons; if the relationship among deltaR, deltaG, and deltaB does not belong to the above conditions of the first to fifth tetrahedrons, it is determined that the current pixel point belongs to the sixth tetrahedron. Assuming that the current pixel point (R, G, B) belongs to the first tetrahedron, during the calculation of the R channel pixel value VR(R, G, B) of the pixel point after LUT processing, delta_valueR_E is the tetrahedron to which the current pixel point belongs The difference between the pixel values of the E channel after the LUT processing of the two vertices on the coordinate axis direction corresponding to the R channel, that is, delta_valueR_R=VR(R5, G5, B5)-VR(R1, G1, B1), delta_valueG_R=VR( R7, G7, B7)-VR(R5, G5, B5), delta_valueB_R=VR(R1, G1, B1)-VR(R0, G0, B0), VR(R, G, B)=VR(R0, G0 , B0)+(delta_valueR_R×deltaR+delta_valueG_R×deltaG+delta_valueB_R×deltaB+(step_size>>1))/(step_size); calculation of the G channel pixel value VG(R, G, B) of the pixel after LUT processing During the process, delta_valueG_E is the difference between the pixel values of the E channel after the LUT processing of the two vertices in the coordinate axis direction of the G channel corresponding to the tetrahedron to which the current pixel belongs, that is, delta_valueR_G=VR(R5, G5, B5)-VR(R1 , G1, B1), delta_valueG_G=VG(R7, G7, B7)-VG(R5, G5, B5), delta_valueB_G=VG(R1, G1, B1)-VG(R0, G0, B0), VG(R, G, B)=VG(R0, G0, B0)+(delta_valueR_G×deltaR+delta_valueG_G×deltaG+delta_valueB_G×deltaB+(step_size>>1))/(step_size); the B channel pixel value of the pixel after LUT processing In the calculation process of VG (R, G, B), delta_valueB_E is the difference between the E channel pixel values of the two vertices on the coordinate axis direction corresponding to the B channel of the tetrahedron to which the current pixel point belongs through LUT processing, i.e. delta_valueR_B=VB( R5, G5, B5)-VB(R1, G1, B1), delta_valueG_B=VB(R7, G7, B7)-VB(R5, G5, B5), delta_valueB_B=VB(R1, G1, B1)-VB(R0 , G0, B0), VB(R, G, B)=VB(R0, G0, B0)+(delta_valueR_B×deltaR+delta_valueG_B×deltaG+delta_valueB_B× deltaB+(step_size>>1))/(step_size). For the case where the current pixel point (R, G, B) belongs to other tetrahedrons, the calculation process is similar, the difference is the calculation of delta_valueR_E, for example, for the second tetrahedron, delta_valueR_R=VR(R7, G7, B7)-VR(R3 , G3, B3), delta_valueG_R=VR(R3,G3,B3)-VR(R1,G1,B1), delta_valueB_R=VR(R1,G1,B1)-VR(R0,G0,B0), based on other tetrahedra The specific calculation process of is not repeated here.

In a possible implementation, as shown in FIG. 7 , before step 104, processing the LOG video based on the LUT corresponding to the determined video style template to obtain the video corresponding to the determined video style template , also includes: step 105, LOG video is converted into the LOG video of YUV color space by the LOG video of RGB color space; Step 106, the LOG video of YUV color space is carried out YUV denoising process, obtains the LOG video after denoising, The LOG video to which the LUT is applied in step 104 is the LOG video after YUV denoising in step 106 . Because the LOG video obtained in step 103 can reflect the details of the dark part, but at the same time, the noise of the dark part will be amplified, that is, noise will be introduced. Therefore, after the LOG video can be converted into a YUV color space, YUV denoising processing can be performed, and the noise can be reduced through an algorithm. to improve video image quality.

In a possible implementation, as shown in FIG. 7 , before step 104, processing the LOG video based on the LUT corresponding to the determined video style template to obtain the video corresponding to the determined video style template , also includes: step 107, the LOG video after denoising is converted into the LOG video of RGB color space by the LOG video of YUV color space; After the process of obtaining the video corresponding to the determined video style template, it also includes: Step 108, converting the video corresponding to the determined video style template in RGB color space into a video in YUV color space. Because the process of processing the LOG video based on the LUT in the step 104 is realized based on the RGB color space, therefore, before the step 104, the video in the YUV color space is converted into the video in the RGB color space, and after the step 104, then Reconvert video in RGB color space to video in YUV color space.

YUV (also known as YCbCr) is a color coding method used by the European television system. In modern color TV systems, three-tube color cameras or color CCD cameras are usually used to capture images, and then the obtained color image signals are separated, amplified and corrected to obtain RGB signals, and then the brightness signals Y and Y are obtained through a matrix conversion circuit. Two color-difference signals B-Y (ie U) and R-Y (ie V), and finally the sending end encodes the three signals separately and sends them out on the same channel. This color representation method is the YUV color space. YCbCr is the specific implementation of the YUV model, which is actually a scaled and offset replica of YUV. Among them, Y has the same meaning as Y in YUV, and both Cb and Cr refer to color, but they are different in the way of expression. In the YUV family, YCbCr is the most widely used member in computer systems, and its application fields are very wide. Both JPEG and MPEG use this format. Generally speaking, YUV mostly refers to YCbCr. The UV plane is shown in Figure 8.

The mutual conversion between RGB and YUV color spaces can be realized by a 3x3 matrix:

There are four main sampling formats for YUV: YCbCr 4:2:0, YCbCr 4:2:2, YCbCr 4:1:1 and YCbCr 4:4:4.

In a possible implementation manner, as shown in FIG. 9, the electronic device may specifically include a camera 193, an anti-mosaic Demosaic module 21, a deformation module 22, a fusion module 23, a noise processing module 24, and a color correction matrix (Color Correction Matrix, CCM) module 25, Global Tone Mapping (Global Tone Mapping, GTM) module 26, scaling Scaler module 27, YUV denoising module 28 and LUT processing module 29, for example, in the process of video recording, camera 193 captures and obtains long exposure frame For the video image and the video image of the short exposure frame, the exposure time corresponding to the video image of the long exposure frame is longer than the exposure time corresponding to the video image of the short exposure frame, and the video image of the long exposure frame and the video image of the short exposure frame are respectively processed by the anti-mosaic module 21 , the image is converted from the RAW domain to the RGB domain, and then the two-way video images are processed by the deformation warp module 22 respectively, and the effects of alignment and anti-shake are realized through the deformation of the video images, and then the two-way video images are processed by the fusion module 23, The two video images are fused into one, and the fused data is divided into two paths. The video processing method includes a first video processing flow S1 and a second video processing flow S2, and one of the paths processed by the fusion module 23 enters the first The video processing flow S1, another way enters the second video processing flow S2.

In the first video processing flow S1, the above-mentioned step 1020, the process of converting the video captured by the camera into a video in a wide-color gamut color space, and the above-mentioned step 103, converting the video in a wide-color gamut color space through a logarithmic LOG curve The process of processing to obtain the LOG video, and the above step 104, the process of processing the LOG video based on the LUT corresponding to the determined video style template to obtain the video corresponding to the determined video style template.

For example, the first video processing flow S1 includes, the video taken by the camera 193 from the fusion module 23 is denoised by the noise processing module 24, and then processed by the CCM module 25 to convert the video into RGB wide color gamut color Space, then carry out above-mentioned step 103 by GTM module 26, process video by LOG curve, obtain LOG video, then carry out scaling processing to video by scaling module 27, then carry out above-mentioned step 106 by YUV denoising module 28, video is carried out YUV denoising, and then perform the above step 104 through the LUT processing module 29, process the video through the LUT, and obtain the video corresponding to the determined video style module. After the first video processing flow S1, the video corresponding to the determined video style template in the first video processing flow S1 is saved as video 1, and a video with style can be obtained.

The second video processing flow S2 includes: the video taken by the camera 193 from the fusion module 23 is denoised by the noise processing module 24, and then processed by the CCM module 25 to convert the video into a color space of RGB wide color gamut, That is, the above-mentioned step 1020, the process of converting the video captured by the camera into a video in a wide color gamut color space, then execute the above-mentioned step 103 through the GTM module 26, process the video through the LOG curve, obtain the LOG video, and then pass the zoom module 27 zoom processing is carried out to video, then carry out above-mentioned step 106 by YUV denoising module 28, carry out YUV denoising to video, then carry out above-mentioned step 104 by LUT processing module 29, process video by LUT, obtain and determined video The video corresponding to the style module. Previewing is performed based on the video corresponding to the determined video style template in the second video processing flow S2.

That is to say, during the video recording process, the two video streams are respectively processed in the first video processing flow S1 and the second video processing flow S2. For the LOG curve-based processing in step 103 and the LUT-based processing in step 104, one video stream is used for encoding and saving, and the other video stream is used for preview.

The following describes the relevant content of RAW and YUV:

Bayer field: Each lens on a digital camera has a light sensor to measure the brightness of the light, but to obtain a full-color image, generally three light sensors are required to obtain the three primary colors of red, green and blue information, and in order to reduce the cost and volume of digital cameras, manufacturers usually use CCD or CMOS image sensors. Usually, the original image output by CMOS image sensors is in Bayer domain RGB format, and a single pixel contains only one color value. To obtain the gray value of the image, it is necessary to interpolate the complete color information of each pixel, and then calculate the gray value of each pixel. In other words, the Bayer domain refers to a raw image format inside a digital camera.

The Raw domain or Raw format refers to unprocessed images. Further, the Raw image can be understood as that the photosensitive element of the camera such as Complementary Metal Oxide Semiconductor (Complementary Metal Oxide Semiconductor, CMOS) or Charge-coupled Device (Charge-coupled Device, CCD) converts the captured light source signal into digital The raw data of the signal. A RAW file is a record of the original information of the digital camera sensor, while recording some metadata (Metadata, such as ISO (International Organization for Standardization, International Organization for Standardization) settings, shutter speed, aperture value) generated by the camera. , white balance, etc.) files. The Raw domain is a format that has not been processed by the ISP nonlinearly and has not been compressed. The full name of Raw format is RAW Image Format.

YUV is a color encoding method that is often used in various video processing components. YUV takes human perception into account when encoding photos or videos, allowing bandwidth reduction for chroma. YUV is a type of compiling true-color color space (color space). Proper nouns such as Y'UV, YUV, YCbCr, and YPbPr can all be called YUV, and they overlap with each other. Among them, "Y" represents the brightness (Luminance or Luma), that is, the grayscale value, "U" and "V" represent the chroma (Chrominance or Chroma), which are used to describe the color and saturation of the image, and are used to specify the color of the pixel . Generally, YUV is divided into two formats, one is: packed formats, which store Y, U, and V values into a Macro Pixels array, which is similar to the storage method of RGB. The other is: planar formats, which store the three components of Y, U, and V in different matrices. Planar formats (planarformats) means that each Y component, U component and V component are organized in an independent plane, that is to say, all U components are behind the Y component, and V components are behind all U components.

In a possible implementation, as shown in FIG. 9 , before step 104, processing the LOG video based on the LUT corresponding to the determined video style template to obtain the video corresponding to the determined video style template , also includes: saving the LOG video, that is, saving the video 2. That is to say, after the LOG video is obtained in step 103, one LOG video is split and saved directly, that is, an unstyled LOG video is saved, that is, recording 2, and the other LOG video is saved after being processed based on the LUT in step 104, that is, saved A video corresponding to the video style template, that is, recording 1. For example, during the recording process, two video files are encoded and saved in a temporary folder at the same time. Based on the user's choice, one of the videos is determined as the final video file. If the user wants to directly To record and generate a "B" movie-style video file, take video 1 as the final video file, and if the user wants to save the original material so as to improve the ability of post-editing, then take video 2 as the final video file. It should be noted that the splitting process of saving the LOG video may be performed after the zooming module 27 scales the video and before the LUT processing module 29 executes the process of step 104 above.

In a possible implementation, as shown in FIG. 9 , before step 104, processing the LOG video based on the LUT corresponding to the determined video style template to obtain the video corresponding to the determined video style template , also includes: converting the LOG video to a video of the Rec.709 color standard; saving the video of the Rec.709 color standard, that is, video 2. That is to say, after the LOG video is obtained in step 103, one channel of LOG video is converted into a primary color video and saved as video 2. A video corresponding to the video style template is saved as video 1. For example, during the recording process, two video files are encoded and saved in a temporary folder at the same time. Based on the user's choice, one of the videos is determined as the final video file. If the user If you want to directly record and generate a "B" movie-style video file, you will use the video corresponding to the video style template, that is, recording 1 as the final video file. The video is converted into a standard video file and saved as the final video file, that is, recording 2 is the final video file. It should be noted that the splitting process of ungraded video can be performed after the zooming module 27 scales the video and before the LUT processing module 29 executes the above-mentioned step 104 .

The following describes the embodiment of the present application in conjunction with the software architecture. The embodiment of the present application takes the Android system with a layered architecture as an example to illustrate the software structure of the electronic device 100 . FIG. 10 is a block diagram of the software structure of the electronic device 100 according to the embodiment of the present application.

The layered architecture divides the software into several layers, and each layer has a clear role and division of labor. Layers communicate through software interfaces. In some embodiments, the Android system is divided into five layers, which are, from top to bottom, the Application layer, the application framework framework layer, the system library library, the Hardware Abstraction Layer (Hardware Abstraction Layer, HAL) and the kernel layer.

The application layer can include applications such as cameras.

The application framework layer may include camera application programming interface (Application Programming Interface, API), media recording MediaRecorder and surface view Surfaceview, etc. Media recording is used to record video or image data and make this data accessible to applications. Surface views are used to display preview images.

A system library can include multiple function modules. For example: camera service CameraSevice, etc.

The hardware abstraction layer is used to provide interface support, for example, including the camera process CameraPipeline for the camera service to call Call.

The kernel layer is the layer between hardware and software. The kernel layer includes display drivers, camera drivers, etc.

Combined with a specific scene of video capture, HAL reports the ability information of recording two videos at the same time, and the application layer sends a capture request CaptureRequest, which corresponds to a stream of recording 1, a stream of recording 2 and a preview stream, and creates two streams at the same time. An example of a media codec mediacodec that receives the encoding of two video streams. HAL calls back three streams according to the above dataflow dataflow. Among them, the preview stream shows that the two video streams are sent to mediacodec respectively.

The video recording and video processing method provided in the embodiment of the present application may be represented as multiple functions in two shooting modes, where the two shooting modes may refer to: movie mode and professional mode.

The movie mode is a shooting mode related to the theme of the movie. In this mode, the image displayed by the electronic device 100 can give the user a sense of watching a movie. The electronic device 100 also provides a plurality of video related to the theme of the movie Style templates, users can use these video style templates to obtain tone-adjusted images or videos, and the tone of these images or videos is similar or identical to the tone of the movie. In the following embodiments of the present application, the movie mode can at least provide an interface for the user to trigger the LUT function and the HDR10 function. For specific descriptions about the LUT function and the HDR10 function, please refer to the following embodiments.

For example, assuming that the electronic device 100 is a mobile phone, in a possible implementation manner, as shown in FIG. 3 , the electronic device may enter a movie mode in response to a user's operation. For example, the electronic device 100 may detect a user's touch operation on the camera application, and in response to the operation, the electronic device 100 displays a default camera interface of the camera application. The default camera interface can include: preview frame, shooting mode list, gallery shortcut keys, shutter controls, etc. in:

The preview frame can be used to display images collected by the camera 193 in real time. The electronic device 100 can refresh the displayed content therein in real time, so that the user can preview the image currently captured by the camera 193 .

One or more shooting mode options may be displayed in the shooting mode list. The one or more shooting mode options may include: portrait mode options, video recording mode options, camera mode options, movie mode options, and professional options. The one or more shooting mode options can be represented as text information on the interface, such as "portrait", "video recording", "photographing", "movie", "professional". Not limited thereto, the one or more shooting mode options may also be represented as icons or other forms of interactive elements (interactive element, IE) on the interface.

Gallery shortcuts can be used to launch the Gallery application. The gallery application program is an application program for picture management on electronic devices such as smart phones and tablet computers, and may also be called "album". The name of the application program is not limited in this embodiment. The gallery application program can support users to perform various operations on pictures stored on the electronic device 100, such as browsing, editing, deleting, selecting and other operations.

The shutter control can be used to listen for user actions that trigger a photo. The electronic device 100 may detect a user operation acting on the shutter control, and in response to the operation, the electronic device 100 may save the image in the preview frame as a picture in the gallery application. In addition, the electronic device 100 may also display the thumbnails of the saved images in the gallery shortcut key. That is, users can tap the shutter control to trigger a photo. Wherein, the shutter control may be a button or other forms of control.

The electronic device 100 may detect a user's touch operation on the movie mode option, and in response to the operation, the electronic device displays a user interface as shown in FIG. 3 .

In some embodiments, the electronic device 100 may turn on the movie mode by default after starting the camera application. Not limited thereto, the electronic device 100 may also enable the movie mode in other ways, for example, the electronic device 100 may also enable the movie mode according to a user's voice command, which is not limited in this embodiment of the present application.

The electronic device 100 may detect a user's touch operation on the movie mode option, and in response to the operation, the electronic device displays a user interface as shown in FIG. 3 .

The user interface shown in FIG. 3 includes function options, and the function options include HDR10 options, flash options, LUT options, and setting options. These multiple function options can detect the user's touch operation, and in response to the operation, enable or disable the corresponding shooting function, for example, HDR10 function, flash function, LUT function, setting function.

The electronic device can enable the LUT function, and the LUT function can change the display effect of the preview image. In essence, the LUT function introduces a color lookup table, which is equivalent to a color conversion model, which can output adjusted color values according to the input color values. The color value of the image captured by the camera is equivalent to the input value, and different color values can be correspondingly obtained as an output value after passing through the color conversion model. Finally, the image displayed in the preview box is the image adjusted by the color transformation model. The electronic device 100 uses the LUT function to display an image composed of color values adjusted by the color conversion model, so as to achieve the effect of adjusting the tone of the image. After the LUT function is enabled, the electronic device 100 can provide multiple video style templates, one video style template corresponds to one color conversion model, and different video style templates can bring different display effects to the preview image. Moreover, these video style templates can be associated with the theme of the movie, and the tone adjustment effect brought by the video style template to the preview image can be close to or the same as the tone in the movie, creating an atmosphere for the user to shoot a movie.

In addition, after the electronic device 100 enables the LUT function, the electronic device 100 can determine a video style template among multiple video style templates according to the current preview video image, and the determined video style template can be displayed on the interface, so that the user can understand Currently determined video style templates, for example, a plurality of video style templates including "A" movie style template, "B" movie style template and "C" movie style template, the corresponding LUTs of different movie style templates can be based on the corresponding Generated by the movie color matching style, the color conversion of the LUT has the style characteristics of the corresponding movie. Film styles can be pre-extracted to produce LUTs suitable for mobile electronics. Turning on the LUT function will change the color tone of the preview video screen. As illustrated in FIG. 3 , the electronic device 100 determines and displays the "A" movie style template.

In some embodiments, the electronic device 100 may select a video style template according to the user's sliding operation. Specifically, when the electronic device 100 detects the user operation of enabling the LUT function and displays the LUT preview window, the electronic device 100 can select the first video style template located in the LUT preview window by default as the video style template selected by the electronic device 100. template. Afterwards, the electronic device 100 can detect the left and right sliding operation of the user acting on the LUT preview window, and move the position of each video style template in the LUT preview window. The first video style template displayed in the preview window is used as the video style template selected by the electronic device 100 .

In some embodiments, in addition to using the video style template to change the display effect of the preview image, the electronic device 100 can also detect a user operation to start recording a video after adding the video style template, and in response to the operation, the electronic device 100 starts recording Video, so as to obtain the video after adjusting the display effect using the video style template. In addition, during the process of recording the video, the electronic device 100 can also detect the user operation of taking a photo. In response to this operation, the electronic device 100 saves the preview image with the video style template added in the preview box as a picture, so as to obtain the user's operation of using the video. The style template adjusts the image after the display effect.

Electronic devices can enable the HDR10 function. In HDR10 mode, HDR is a high-dynamic range image (High-Dynamic Range, HDR). Compared with ordinary images, HDR can provide more dynamic range and image details, and can better Reflecting the visual effects in the real environment, 10 in HDR10 is 10 bits, and HDR10 can record video with a high dynamic range of 10 bits.

The electronic device 100 may detect the user's touch operation on the professional mode option, and enter the professional mode. As shown in Figure 11, when the electronic device is in the professional mode, the functional options that can be included in the user interface are, for example: LOG option, flashlight option, LUT option, and setting option. In addition, the user interface also includes parameter adjustment options, such as: measurement Light M option, ISO option, shutter S option, exposure compensation EV option, focus mode AF option and white balance WB option.

In some embodiments, the electronic device 100 may turn on the professional mode by default after starting the camera application. Not limited thereto, the electronic device 100 can also enable the professional mode in other ways, for example, the electronic device 100 can also enable the professional mode according to the user's voice command, which is not limited in this embodiment of the present application.

The electronic device 100 may detect a user operation on the LOG option by the user, and in response to the operation, the electronic device 100 enables the LOG function. Among them, the LOG function can apply the logarithmic function to the exposure curve to preserve the details of the highlights and shadows in the image captured by the camera to the maximum extent, so that the saturation of the final preview image is lower. Among them, the video recorded with LOG function is called LOG video.

The electronic device 100 can not only record a video with a video style template added through the professional mode, but also add a video style template to the video after recording a video without a video style template, or record a LOG video after enabling the LOG function. Then add a video style template for the LOG video. In this way, the electronic device 100 can not only adjust the display effect of the picture before recording the video, but also adjust the display effect of the recorded video after the video recording is completed, which increases the flexibility and freedom of image adjustment.

As shown in Figure 9, the embodiment of the present application also provides a video processing device, including: a video style determination module, configured to determine a video style template among a plurality of video style templates, and each video style template corresponds to a preset Three-dimensional color lookup table LUT; video acquisition module, used to obtain the video taken by the camera; CCM module 25, used to convert the video taken by the camera into the video of the color space of wide color gamut; the first processing module, used to pass the The logarithmic LOG curve corresponding to the current sensitivity ISO of the camera processes the video in the color space of the wide color gamut to obtain the LOG video; the second processing module is used to process the LOG video based on the LUT corresponding to the determined video style template processing to obtain the video corresponding to the determined video style template.

The video processing device can apply the above-mentioned video processing method, and the specific process and principle will not be repeated here, wherein, the first processing module can specifically be the GTM module 26 in the above-mentioned embodiment, and the second processing module can be specifically the above-mentioned embodiment The LUT processing module 29 in.

In a possible implementation manner, the first processing module is specifically configured to: establish a cube interpolation space based on the LUT, where the LUT is a three-dimensional 3D-LUT; determine the cube to which each pixel in the LOG video belongs in the cube interpolation space, and the cube Divided into 6 tetrahedrons; determine the tetrahedron to which each pixel point in the LOG video belongs; for the pixel point corresponding to the vertex of the cube, convert the pixel value to the pixel value after LUT processing; for the pixel point not corresponding to the vertex of the cube , perform interpolation according to the tetrahedron to which each pixel belongs, and convert the pixel value into a pixel value after LUT processing.

In a possible implementation manner, the first processing module is specifically configured to, if the linear region data of the video in the color space of the wide color gamut is greater than the preset value cut, then according to the formula c×log ₁₀ (a×x+b) +d converts the linear area data of the video in the color space of the wide color gamut, wherein, cut, c, a and b are LOG curve parameters, and x is the linear area data of the video in the color space of the wide color gamut before conversion; If the linear region data of the video in the color space of the wide color gamut is not greater than the preset value cut, then the linear region data of the video in the color space of the wide color gamut is converted according to the formula e×x+f, where e and f are LOG curve parameters.

In a possible implementation manner, the CCM module 25 is specifically configured to convert the video captured by the camera into a video in a color space of a wide color gamut through a color correction matrix CCM;

M is a preset compensation matrix.

In a possible implementation manner, the video processing device further includes: a conversion module, configured to convert the LOG video from the LOG video of the RGB color space to the LOG video of the YUV color space. Between the module 27 and the YUV denoising module 28, the conversion module is not shown in FIG. 9; the YUV denoising module 28 is used to perform YUV denoising processing on the LOG video in the YUV color space to obtain the denoised LOG video.

In a possible implementation manner, the video processing device further includes: a first conversion module, configured to convert the denoised LOG video from a LOG video in a YUV color space to a LOG video in an RGB color space, and the first conversion module Can be located between the YUV denoising module 28 and the LUT processing module 29 in Fig. 9; The second conversion module is used to convert the video corresponding to the determined video style template of the RGB color space into the video of the YUV color space, the The second conversion module may be located between the LUT processing module 29 in FIG. 9 and the process of saving the video recording 1. The first conversion module and the second conversion module are not shown in FIG. 9 .

In a possible implementation manner, the video processing device further includes: a first saving module, configured to save the video corresponding to the determined video style template; a second saving module, configured to save the LOG video.

In a possible implementation manner, the video processing device further includes: a first saving module, used to save the video corresponding to the determined video style template; a backup conversion module, used to convert the LOG video to the Rec.709 color standard video; the second saving module is used to save the video of the Rec.709 color standard.

In a possible implementation manner, in the first video processing flow, the process of converting the video taken by the camera into the video of the color space of the wide color gamut, and the video of the color space of the wide color gamut through the logarithmic LOG curve Process to obtain the process of LOG video and process the LOG video based on the LUT corresponding to the determined video style template to obtain the process of video corresponding to the determined video style template; the video processing method also includes a second video processing flow , the second video processing flow includes: converting the video captured by the camera into a video in a wide color gamut color space, processing the video in a wide color gamut color space through a logarithmic LOG curve, and obtaining a LOG video; Based on the LUT corresponding to the determined video style template, the LOG video is processed to obtain the process of video corresponding to the determined video style template; the video processing method also includes: a first saving module, which is used to process the first video in the video processing flow The video corresponding to the determined video style template is saved; the preview module is configured to perform preview based on the video corresponding to the determined video style template in the second video processing flow.

In a possible implementation, the cube has the 0th to 7th vertices, the direction from the 0th vertex to the 1st vertex is the coordinate axis direction of the blue B channel, and the direction from the 0th vertex to the 4th vertex is the red R The coordinate axis direction of the channel, the direction from the 0th vertex to the 2nd vertex is the coordinate axis direction of the green G channel, the 0th vertex, the 1st vertex, the 2nd vertex and the 3rd vertex are on the same plane, the 1st vertex and the 3rd vertex , the 5th vertex and the 7th vertex are located on the same plane, the 4th vertex, the 5th vertex, the 6th vertex and the 7th vertex are located on the same plane, the 0th vertex, the 2nd vertex, the 4th vertex and the 6th vertex are located on the same plane; The 0th vertex, the 1st vertex, the 5th vertex and the 7th vertex form the first tetrahedron, the 0th vertex, the 1st vertex, the 3rd vertex and the 7th vertex form the second tetrahedron, the 0th vertex, the 2nd The vertex, the 3rd vertex and the 7th vertex form the third tetrahedron, the 0th vertex, the 4th vertex, the 5th vertex and the 7th vertex form the fourth tetrahedron, the 0th vertex, the 4th vertex, the 6th vertex and The 7th vertex forms the fifth tetrahedron, and the 0th vertex, the 2nd vertex, the 6th vertex and the 7th vertex form the sixth tetrahedron; the first processing module is specifically used to, according to the current pixel point (R, G, B ) to generate the E channel pixel value VE(R, G, B) after LUT processing, and E takes R, G and B; VE(R, G, B)=VE(R0, G0, B0)+(delta_valueR_E×deltaR +delta_valueG_E×deltaG+delta_valueB_E×deltaB+(step_size>>1))/(step_size); VE(R0, G0, B0) is the E channel pixel value of the 0th vertex (R0, G0, B0) after LUT processing, E Take R, G, and B; delta_valueR is the difference between the R channel pixel values of the two vertices in the coordinate axis direction of the R channel corresponding to the tetrahedron to which the current pixel belongs after LUT processing, and delta_valueG is the G channel corresponding to the tetrahedron to which the current pixel belongs The difference between the G-channel pixel values of two vertices in the direction of the coordinate axis after LUT processing, delta_valueB is the B-channel pixel value of the two vertices in the direction of the coordinate axis of the tetrahedron to which the current pixel belongs corresponds to the B channel after LUT processing difference; deltaR is the difference between the R value in the current pixel point (R, G, B) and the R0 value in the 0th vertex (R0, G0, B0), and deltaG is the difference in the current pixel point (R, G, B). The difference between the G value at the 0th vertex (R0, G0, B0) and the G0 value at the 0th vertex (R0, G0, B0), deltaB is the B value at the current pixel (R, G, B) and the 0th vertex (R0, G0, B0) The difference between the B0 values; step_size is the side length of the cube.

It should be understood that the above division of each module of the video processing device is only a division of logical functions, and may be fully or partially integrated into one physical entity or physically separated during actual implementation. And these modules can all be implemented in the form of software called by the processing element; they can also be implemented in the form of hardware; some modules can also be implemented in the form of software called by the processing element, and some modules can be implemented in the form of hardware. For example, any one of the video style determination module, the video acquisition module, the CCM module, the first processing module, and the second processing module can be a separate processing element, or can be integrated in a video processing device, such as integrated in a video processing In addition, it can also be stored in the memory of the video processing device in the form of a program, and a certain processing element of the video processing device calls and executes the functions of the above modules. The implementation of other modules is similar. In addition, all or part of these modules can be integrated together, and can also be implemented independently. The processing element mentioned here may be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each module above can be completed by an integrated logic circuit of hardware in the processor element or an instruction in the form of software.

For example, the video style determination module, the video acquisition module, the CCM module, the first processing module and the second processing module may be one or more integrated circuits configured to implement the above method, for example: one or more specific integrated circuits (Application Specific Integrated Circuit, ASIC), or, one or more microprocessors (digital signal processor, DSP), or, one or more field programmable gate arrays (Field Programmable Gate Array, FPGA), etc. For another example, when one of the above modules is implemented in the form of a processing element scheduler, the processing element may be a general-purpose processor, such as a central processing unit (Central Processing Unit, CPU) or other processors that can call programs. For another example, these modules can be integrated together and implemented in the form of a system-on-a-chip (SOC).

An embodiment of the present application further provides a video processing device, including: a processor and a memory, the memory is used to store at least one instruction, and when the instruction is loaded and executed by the processor, the video processing method in any of the foregoing embodiments is implemented.

The video processing apparatus may apply the above-mentioned video processing method, and the specific process and principle will not be repeated here.

The number of processors may be one or more, and the processors and memory may be connected through a bus or in other ways. As a non-transitory computer-readable storage medium, the memory can be used to store non-transitory software programs, non-transitory computer-executable programs and modules, such as program instructions/modules corresponding to the video processing device in the embodiment of the present application. The processor executes various functional applications and data processing by running non-transitory software programs, instructions and modules stored in the memory, that is, implements the method in any of the above method embodiments. The memory may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one function; and necessary data and the like. In addition, the memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid-state storage devices.

As shown in FIG. 1 , an embodiment of the present application further provides an electronic device, including: a camera 193 and the above-mentioned video processing device, where the video processing device includes a processor 110 .

The specific principle and working process of the video processing device are the same as those of the above-mentioned embodiments, and will not be repeated here. The electronic device may be any product or component with a video shooting function such as a mobile phone, a TV, a tablet computer, a watch, a bracelet, and the like.

An embodiment of the present application further provides a computer-readable storage medium, in which a computer program is stored, and when running on a computer, the computer is made to execute the video processing method in any of the foregoing embodiments.

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the present application will be generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server or data center Transmission to another website site, computer, server, or data center by wired (eg, coaxial cable, optical fiber, DSL) or wireless (eg, infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrated with one or more available media. The available medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, DVD), or a semiconductor medium (for example, a Solid State Disk).

In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. "And/or" describes the association relationship of associated objects, indicating that there may be three kinds of relationships, for example, A and/or B may indicate that A exists alone, A and B exist simultaneously, or B exists alone. Among them, A and B can be singular or plural. The character "/" generally indicates that the contextual objects are an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, and c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, and c may be single or multiple.

The above are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, there may be various modifications and changes in the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (9)

1. A video processing method, characterized in that, comprising:

   A video style template is determined among multiple video style templates, and each video style template corresponds to a preset color lookup table LUT;

   Get the video shot by the camera;

   Converting the video captured by the camera into a video in the color space of wide color gamut;

   Process the video in the color space of the wide color gamut through the logarithmic LOG curve corresponding to the current sensitivity ISO of the camera to obtain the LOG video;

   The LOG video is processed based on the LUT corresponding to the determined video style template to obtain a video corresponding to the determined video style template.
2. The video processing method according to claim 1, wherein,

   The process of processing the video in the color space of the wide color gamut through the logarithmic LOG curve corresponding to the current sensitivity ISO of the camera, and obtaining the LOG video includes:

   If the linear region data of the video in the color space of the wide color gamut is greater than the preset value cut, then the linearity of the video in the color space of the wide color gamut is calculated according to the formula c×log ₁₀ (a×x+b)+d Area data is converted, wherein, cut, c, a and b are LOG curve parameters, and x is the linear area data of the video of the color space of described wide color gamut before conversion;

   If the linear region data of the video in the color space of the wide color gamut is not greater than the preset value cut, then convert the linear region data of the video in the color space of the wide color gamut according to the formula e×x+f, Among them, e and f are LOG curve parameters.
3. The video processing method according to claim 1, wherein,

   The process of converting the video taken by the camera into the video of the color space of wide color gamut includes:

   The video captured by the camera is converted into a video in a color space of a wide color gamut through a color correction matrix CCM;

   

   M is a preset compensation matrix.
4. The video processing method according to claim 1, wherein,

   Before the process of processing the LOG video based on the LUT corresponding to the determined video style template to obtain the video corresponding to the determined video style template, it also includes:

   The LOG video is converted into the LOG video of the YUV color space by the LOG video of RGB color space;

   Perform YUV denoising processing on the LOG video in the YUV color space to obtain the denoised LOG video.
5. The video processing method according to claim 4, wherein,

   Before the process of processing the LOG video based on the LUT corresponding to the determined video style template to obtain the video corresponding to the determined video style template, it also includes:

   The LOG video after described denoising is converted into the LOG video of RGB color space by the LOG video of YUV color space;

   After the process of processing the LOG video based on the LUT corresponding to the determined video style template to obtain the video corresponding to the determined video style template, it also includes:

   The video corresponding to the determined video style template in the RGB color space is converted into the video in the YUV color space.
6. The video processing method according to claim 1, wherein,

   Before the process of processing the LOG video based on the LUT corresponding to the determined video style template to obtain the video corresponding to the determined video style template, the method further includes: saving the LOG video.
7. A video processing device, characterized in that it comprises:

   A processor and a memory, the memory is used to store at least one instruction, and when the instruction is loaded and executed by the processor, the video processing method according to any one of claims 1 to 6 can be realized.
8. An electronic device, characterized in that it comprises:

   Camera;

   The video processing device as claimed in claim 7.
9. A computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, and when it runs on a computer, the computer executes the video program according to any one of claims 1 to 6. Approach.

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