CN111970474B - Intelligent screen mixing method and system for multi-channel videos - Google Patents
Intelligent screen mixing method and system for multi-channel videos Download PDFInfo
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- CN111970474B CN111970474B CN202010886788.6A CN202010886788A CN111970474B CN 111970474 B CN111970474 B CN 111970474B CN 202010886788 A CN202010886788 A CN 202010886788A CN 111970474 B CN111970474 B CN 111970474B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
- H04N7/15—Conference systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/16—Human faces, e.g. facial parts, sketches or expressions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/2628—Alteration of picture size, shape, position or orientation, e.g. zooming, rotation, rolling, perspective, translation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/265—Mixing
Abstract
The invention relates to an intelligent screen mixing method and system of multi-channel videos, which comprises the steps of creating a screen mixing container, adding the multi-channel videos to be mixed, and configuring corresponding decoding resources and portrait recognition resources for each channel of video through the screen mixing container; after the decoding resources are used for respectively decoding each corresponding path of video one by one, the portrait recognition resources are used for recognizing the portrait of each path of decoded video, and the position of the portrait in each path of video is calculated according to the portrait recognition result; setting a plurality of container layouts corresponding to different output parameters for the mixed screen container, and uniformly distributing and dividing planes to obtain the layout position of each path of video when the mixed screen is displayed; and calculating and optimizing a cutting position according to the portrait position and the layout position, cutting the video according to the cutting position, mixing the screen, encoding and sending to a far end. The invention solves the problem that the whole or part of a portrait cannot be cut when the original video is cut during screen mixing at the server end at present.
Description
Technical Field
The invention relates to the technical field of computer communication, in particular to an intelligent multi-channel video screen mixing method and system.
Background
With the development of computer communication technology and the improvement of communication environment, video conferences are more and more widely applied in work and life, and video conference participants use more and more devices, and besides traditional PCs, mobile phones of various models are available. However, the specifications (aspect ratios) of videos captured by cameras used in these devices are also various, some are horizontal screens, and some are vertical screens. When the screen mixing is carried out at the server, the original video needs to be cut to a certain extent, but when the cutting is carried out, only the middle part is reserved, and the head portrait of the conference participant can be cut wholly or partially if not in the middle position. To ensure that the portrait is not cropped, it is necessary to ensure that the participant's portrait is in a neutral position. In the prior art, the position of a camera is mostly adjusted to center the portrait. Since the participants are not all kept in one position, and may be moving, there is no guarantee that the portrait will always be in the middle position, and therefore there is no guarantee that the portrait is not cut in whole or in part.
Disclosure of Invention
In view of the foregoing analysis, the present invention aims to provide an intelligent multi-channel video screen mixing method and system, so as to solve the problem that the clipping of the original video at the server end cannot guarantee that the whole or part of the portrait is not clipped.
The purpose of the invention is mainly realized by the following technical scheme:
on one hand, the invention provides an intelligent screen mixing method for multi-channel videos, which comprises the following steps:
creating a mixed screen container, adding multiple paths of videos to be mixed, and configuring corresponding decoding resources and portrait identification resources for each path of video through the mixed screen container;
after receiving the multiple paths of videos to be mixed, decoding each path of corresponding video one by utilizing the decoding resources, performing portrait recognition on each path of decoded video by adopting the portrait recognition resources, and calculating the position of a portrait in each path of video according to a portrait recognition result;
setting a plurality of container layouts corresponding to different output parameters for the created mixed screen container, and performing plane uniform distribution division according to the output specification and the number of input video paths to obtain the layout position of each path of video during mixed screen display; wherein, the different output of each parameter corresponds to a layout position, and the parameters comprise the number of input video paths, the coding type and the output specification;
and calculating and optimizing a cutting position according to the portrait position and the layout position, sending the cut multi-channel video into a mixed screen container according to the cutting position, and then sending the multi-channel video to a far end after coding.
Further, calculating and optimizing a clipping position according to the portrait position and the layout position includes: when the position of the portrait of any one video is changed, recalculating the position of the portrait of the video;
if the portrait position is still within the layout position range calculated in the previous time, the layout position is aligned without changing the cutting position;
and if the portrait position exceeds the layout position range calculated at the previous time, adjusting the cutting position to adapt to the layout position.
Further, when creating a mixed-screen container, the mixed-screen container resources are allocated, including the cpu and the memory.
Further, when adding multiple paths of videos to be mixed, the mixed-screen container sets parameters including the number of video paths and decoding types, allocates a network port at a receiving end of the system, and allocates decoding resources including a cpu and a memory for each path of video.
Furthermore, when a plurality of outputs with different parameters are set for the mixed screen container, parameters including the number of video paths, the coding type and the output specification are set, and a far-end port address is allocated.
In another aspect, the present invention provides an intelligent multi-channel video mixed-screen system, which includes a receiver, a decoder, a calculator, a mixed-screen container, an encoder and a transmitter;
the screen mixing container is used for adding a plurality of paths of videos to be mixed and configuring corresponding decoding resources and portrait identification resources for each path of video; the mixed screen container is also used for setting a plurality of container layouts corresponding to different output parameters of the mixed screen container, and performing plane uniform distribution division according to the output specification and the input video path number to obtain the layout position of each path of video during the mixed screen display; wherein, the different output of each parameter corresponds to a layout position, and the parameters comprise the number of input video paths, the coding type and the output specification;
the receiver is used for receiving the multi-channel video to be mixed after the multi-channel video to be mixed is added into the screen mixing container;
the decoder is used for decoding each path of video one by utilizing the decoding resources;
the calculator is used for adopting the portrait recognition resource to carry out portrait recognition on each path of decoded video and calculating the position of the portrait in each path of video according to the portrait recognition result; the system is also used for calculating and optimizing a cutting position according to the portrait position and the layout position, and sending the cut multi-channel video to the mixed screen container according to the cutting position;
and the encoder is used for encoding the multi-channel video after screen mixing and transmitting the multi-channel video to a transmitter connected with a far end.
Further, calculating and optimizing a clipping position according to the portrait position and the layout position includes: when the position of the portrait of any one video is changed, recalculating the position of the portrait of the video;
if the portrait position is still within the layout position range calculated in the previous time, the layout position is aligned without changing the cutting position;
and if the portrait position exceeds the layout position range calculated at the previous time, adjusting the cutting position to adapt to the layout position.
Further, the screen mixing container is divided into screen mixing container resources which comprise a cpu and a memory.
Further, when adding multiple paths of videos to be mixed, the mixed-screen container sets parameters including the number of video paths and decoding types, allocates network ports of the receiver, and allocates decoding resources including a cpu and a memory for each path of video.
Further, when a plurality of outputs with different parameters are set for the mixed-screen container, parameters including the number of video paths, the coding type and the output specification are set, and a far-end port address connected with the transmitter is allocated.
The technical scheme has the beneficial effects that: the invention discloses an intelligent screen mixing method and system for multi-channel videos, and the embodiment of the invention solves the problem that the whole or part of a portrait cannot be cut when the original video is cut during screen mixing at a server side at present.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
Fig. 1 is a schematic flow chart of an intelligent multi-channel video screen mixing method according to an embodiment of the present invention;
FIG. 2 is a portrait view of a way A video according to an embodiment of the present invention;
FIG. 3 is a human image of a B-channel video according to an embodiment of the present invention;
FIG. 4 is a human image of a C-channel video according to an embodiment of the present invention;
FIG. 5 is a portrait view of a D-way video according to an embodiment of the present invention;
FIG. 6 is a diagram of a portrait mixed screen display of a multi-channel video according to an embodiment of the present invention;
fig. 7 is a frame diagram of an intelligent multi-channel video screen mixing system according to an embodiment of the present invention.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
A specific embodiment of the present invention, as shown in fig. 1, discloses an intelligent multi-channel video screen mixing method, which includes the following steps:
s1, creating a mixed screen container, adding multiple paths of videos to be mixed, and configuring corresponding decoding resources and portrait identification resources for each path of video through the mixed screen container;
s2, after receiving the multi-channel videos to be mixed, decoding each corresponding channel of videos one by using the decoding resources, performing portrait recognition on each channel of decoded videos by using the portrait recognition resources, and calculating the position of a portrait in each channel of videos according to the portrait recognition result;
s3, setting a plurality of output container layouts with different corresponding parameters for the created mixed screen container, and performing plane uniform distribution division according to the output specification and the input video path number to obtain the layout position of each path of video during mixed screen display; wherein, the different output of each parameter corresponds to a layout position, and the parameters comprise the number of input video paths, the coding type and the output specification;
and S4, calculating and optimizing a cutting position according to the portrait position and the layout position, sending the cut multi-channel video into a mixed screen container according to the cutting position, and sending the multi-channel video to a far end after coding.
Compared with the prior art, the embodiment of the invention determines the position of the portrait in the video through portrait recognition as the basis for mixed screen cutting, thereby avoiding the portrait from being cut in the mixed screen and realizing the intelligent mixed screen of multiple paths of videos.
Specifically, the intelligent multi-channel video screen mixing method includes the following steps:
Step 20, adding a video source into the mixed-screen container, setting encoding parameters (payload and encoding type) of the video source, distributing network ports received by the system, and distributing decoding resources (cpu, memory) for each path of video; the video source is a multi-channel video to be mixed; setting coding parameters for each video, wherein the coding parameters are used for indicating the loaded data; and distributing the CPU required by decoding and the memory resource stored after decoding for each path of video according to the data size.
And step 30, identifying resources for each video application portrait through a mixing container.
And step 40, adding output for the mixed screen container, and setting corresponding parameters including payload, code, specification (width and height) and a receiving end address port, wherein a plurality of different parameter outputs can be added.
And step 50, adding layouts for the containers according to the output specification and the input video paths, wherein each different output corresponds to one layout.
After the addition is completed, video sources are received in sequence, as shown in fig. 2, fig. 3, fig. 4 and fig. 5, step 60.
And step 70, decoding the video sources one by one.
And 80, identifying the portrait and calculating the position of the portrait.
Step 90, calculating a position to be cut according to the portrait position and the layout position, cutting the video, and when the portrait position is changed but is still within the layout position range calculated in the previous time, not changing the cutting position; that is, the picture jump caused by frequently adjusting the clipping position can be avoided, and the adjustment is performed only when the portrait position exceeds the layout position range calculated in the previous time.
And step 100, mixing the cut video image, as shown in fig. 6.
And step 110, coding the mixed screen video image.
And step 120, transmitting and outputting to a far end for receiving after encoding.
In an embodiment of the present invention, calculating and optimizing the clipping position according to the portrait position and the layout position includes: when the position of the portrait of any one video is changed, recalculating the position of the portrait of the video;
if the portrait position is still within the layout position range calculated in the previous time, the layout position is aligned without changing the cutting position;
and if the portrait position exceeds the layout position range calculated at the previous time, adjusting the cutting position to adapt to the layout position.
Specifically, after the portrait recognition resource performs portrait recognition on each decoded video, the portrait recognition resource draws video image data including a portrait position in a predefined memory map respectively, and sends the memory map corresponding to the layout position to the mixed screen container according to the layout position of each video during mixed screen display. When the portrait position is still within the layout position range calculated in the previous time after being changed, the clipping position is not changed, and the memory map corresponding to the layout position is continuously sent to the mixed screen container; and if not, recalculating the video image data with the changed portrait position, redrawing the video image data in a predefined memory map to finish the adjustment of the cutting position, and sending the memory map to the mixed screen container to adapt to the layout position.
According to the embodiment of the invention, when the mixed-screen container is created, the mixed-screen container resources are distributed, wherein the mixed-screen container resources comprise a cpu and a memory.
Specifically, the multi-channel video to be mixed occupies cpu and memory resources, and the cpu and the memory are divided, and corresponding decoding resources and portrait identification resources are configured for each channel of video.
In a specific embodiment of the present invention, when adding multiple channels of videos to be mixed, the screen mixing container sets parameters including the number of video channels and the decoding type, allocates a network port at a receiving end of the system, and allocates decoding resources including a cpu and a memory to each channel of video.
Specifically, when the multi-channel video to be mixed is decoded by using the mixed-screen container resource, the multi-channel video is decoded by using the decoding resources configured with the cpu and the memory according to the set decoding parameters, and then the network port of the receiving end of the system is allocated to each decoded video. The decoding parameters comprise the number of video channels and the decoding type, the decoding parameters are adjusted according to different video sources added into the mixed screen container, and the video sources are multi-channel videos to be mixed.
In an embodiment of the present invention, when a plurality of outputs with different parameters are set for the mixed-screen container, parameters including the number of video channels, the encoding type, and the output specification are set, and a remote port address is assigned.
Specifically, parameters including payload, encoding type, specification (width and height), and receiving end address port are set, and a plurality of different outputs with different parameters can be added.
One embodiment of the present invention, as shown in fig. 7, discloses an intelligent multi-channel video mixed-screen system, which includes a receiver 10, a decoder 11, a calculator 12, a mixed-screen container 13, an encoder 14 and a transmitter 15;
the screen mixing container 13 is used for adding multiple paths of videos to be mixed and configuring corresponding decoding resources and portrait identification resources for each path of video; the mixed screen container is also used for setting a plurality of container layouts corresponding to different output parameters of the mixed screen container, and performing plane uniform distribution division according to the output specification and the input video path number to obtain the layout position of each path of video during the mixed screen display; wherein, the different output of each parameter corresponds to a layout position, and the parameters comprise the number of input video paths, the coding type and the output specification;
the receiver 10 is configured to receive the multiple channels of videos to be mixed after the multiple channels of videos to be mixed are added into the mixed-screen container 13;
the decoder 11 is configured to decode each corresponding video path one by using the decoding resources;
the calculator 12 is configured to perform face recognition on each decoded video by using the face recognition resource, and calculate a face position in each video according to a face recognition result; the multi-channel video cutting device is also used for calculating and optimizing a cutting position according to the portrait position and the layout position, and sending the cut multi-channel video to the mixed screen container 13 according to the cutting position;
and the encoder 14 is used for encoding the multi-channel video after screen mixing and transmitting the multi-channel video to a transmitter 15 connected to a far end.
In an embodiment of the present invention, calculating and optimizing the clipping position according to the portrait position and the layout position includes: when the position of the portrait of any one video path is changed, the position of the portrait of the video path is recalculated;
if the portrait position is still within the layout position range calculated in the previous time, the layout position is aligned without changing the cutting position;
and if the portrait position exceeds the layout position range calculated at the previous time, adjusting the cutting position to adapt to the layout position.
According to a specific embodiment of the invention, the screen mixing container is divided into screen mixing container resources, including a cpu and a memory.
In a specific embodiment of the present invention, when adding multiple paths of videos to be mixed, the screen mixing container sets parameters including the number of video paths and the decoding type, allocates a network port of the receiver, and allocates decoding resources including a cpu and a memory to each path of video.
In an embodiment of the present invention, when a plurality of outputs with different parameters are set for the mixed-screen container, parameters including the number of video channels, the encoding type, and the output specification are set, and a remote port address to which the transmitter is connected is assigned.
In summary, the present invention discloses an intelligent multi-channel video screen mixing method and system, wherein the method comprises: creating a mixed screen container, adding multiple paths of videos to be mixed, and configuring corresponding decoding resources and portrait identification resources for each path of video through the mixed screen container; after receiving the multiple paths of videos to be mixed, decoding each path of corresponding video one by utilizing the decoding resources, performing portrait recognition on each path of decoded video by adopting the portrait recognition resources, and calculating the position of a portrait in each path of video according to a portrait recognition result; setting a plurality of output container layouts with different corresponding parameters for the created mixed screen container, and performing planar uniform distribution and division according to the output specification and the input video path number to obtain the layout position of each path of video during mixed screen display; wherein, the different output of each parameter corresponds to a layout position, and the parameters comprise the number of input video paths, the coding type and the output specification; and calculating and optimizing a cutting position according to the portrait position and the layout position, sending the cut multi-channel video into a mixed screen container according to the cutting position, and sending the multi-channel video to a far end after coding. The system which forms the same inventive idea with the method is also disclosed, comprising a receiver, a decoder, a calculator, a mixed screen container, an encoder and a transmitter. The technical scheme of the invention determines the portrait position in the video through portrait recognition, and the portrait position is used as the basis for mixed screen cutting, so that the intelligent mixed screen of a plurality of paths of videos is realized, namely, the position to be cut is calculated according to the portrait position and the layout position, the video is cut, when the portrait position is changed but is still within the layout position range calculated in the previous time, the cutting position is not changed, and only when the portrait position exceeds the layout position range calculated in the previous time, the adjustment is carried out, so that the picture jump caused by frequent adjustment of the cutting position is avoided.
Those skilled in the art will appreciate that all or part of the processes for implementing the methods in the above embodiments may be implemented by a computer program, which is stored in a computer-readable storage medium, to instruct associated hardware. The computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (9)
1. An intelligent multi-channel video screen mixing method is characterized by comprising the following steps:
creating a mixed screen container, adding multiple paths of videos to be mixed, and configuring corresponding decoding resources and portrait identification resources for each path of video through the mixed screen container;
after receiving the multiple paths of videos to be mixed, decoding each path of corresponding video one by utilizing the decoding resources, performing portrait recognition on each path of decoded video by adopting the portrait recognition resources, and calculating the position of a portrait in each path of video according to a portrait recognition result;
setting a plurality of container layouts corresponding to different output parameters for the created mixed screen container, and performing plane uniform distribution division according to the output specification and the number of input video paths to obtain the layout position of each path of video during mixed screen display; wherein, the different output of each parameter corresponds to a layout position, and the parameters comprise the input video path number, the coding type and the output specification;
calculating and optimizing a cutting position according to the portrait position and the layout position, sending the cut multi-channel video into a mixed screen container according to the cutting position, and then sending the multi-channel video to a far end after coding;
calculating and optimizing a clipping position according to the portrait position and the layout position comprises: when the position of the portrait of any one video is changed, recalculating the position of the portrait of the video;
if the portrait position is still within the layout position range calculated in the previous time, the layout position is aligned without changing the cutting position;
and if the portrait position exceeds the layout position range calculated at the previous time, adjusting the cutting position to adapt to the layout position.
2. The method of claim 1, wherein when creating a mixed-screen container, allocating mixed-screen container resources, including cpu and memory.
3. The method according to claim 1, wherein when the multiple paths of videos to be mixed are added into the mixing container, parameters including the number of video paths and the decoding type are set, a network port at a receiving end of the system is allocated, and decoding resources including a cpu and a memory are allocated to each path of video.
4. The method of claim 1, wherein when a plurality of outputs with different parameters are set for the mixed-screen container, parameters including the number of video paths, the coding type, and the output specification are set, and a remote port address is assigned.
5. An intelligent multi-channel video screen mixing system is characterized by comprising a receiver, a decoder, a calculator, a screen mixing container, an encoder and a transmitter;
the screen mixing container is used for adding a plurality of paths of videos to be mixed and configuring corresponding decoding resources and portrait identification resources for each path of video; the mixed screen container is also used for setting a plurality of container layouts corresponding to different output parameters of the mixed screen container, and performing plane uniform distribution division according to the output specification and the input video path number to obtain the layout position of each path of video during the mixed screen display; wherein, the different output of each parameter corresponds to a layout position, and the parameters comprise the number of input video paths, the coding type and the output specification;
the receiver is used for receiving the multi-channel video to be mixed after the multi-channel video to be mixed is added into the screen mixing container;
the decoder is used for decoding each path of video one by utilizing the decoding resources;
the calculator is used for adopting the portrait recognition resource to carry out portrait recognition on each path of decoded video and calculating the position of the portrait in each path of video according to the portrait recognition result; the system is also used for calculating and optimizing a cutting position according to the portrait position and the layout position, and sending the cut multi-channel video to the mixed screen container according to the cutting position;
and the encoder is used for encoding the multi-channel video after screen mixing and transmitting the multi-channel video to a transmitter connected with a far end.
6. The system of claim 5, wherein calculating and optimizing a cropping position based on the portrait position and the layout position comprises: when the position of the portrait of any one video is changed, recalculating the position of the portrait of the video;
if the portrait position is still within the layout position range calculated in the previous time, the layout position is aligned without changing the cutting position;
and if the portrait position exceeds the layout position range calculated at the previous time, adjusting the cutting position to adapt to the layout position.
7. The system of claim 5, wherein the screen mixing container is partitioned into screen mixing container resources comprising a cpu and a memory.
8. The system according to claim 5, wherein when the screen mixing container joins multiple paths of videos to be mixed, parameters including the number of video paths and the decoding type are set, and a network port of the receiver is allocated, and decoding resources including a cpu and a memory are allocated for each path of video.
9. The system according to claim 5, wherein when a plurality of outputs different in parameter are set for the mixing container, parameters including the number of video paths, the type of encoding, and the output specification are set, and the remote port address to which the transmitter is connected is assigned.
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