TWI473498B - A video resolution switching method and device, a terminal and a switching system - Google Patents

Description

Method and device for switching video resolution, terminal and switching system

The present invention relates to the field of communications technologies, and in particular, to a method and device for switching video resolution, a terminal, and a switching system.

With the continuous development of network technology, network video communication has been more and more widely used. In network video communication, first, the videoconferencing parties establish a network connection, and one or both of the network cameras activate the network camera to capture the video stream, and send the captured video stream to the other party through the established network connection, and receive the video. The party to the stream presents the video to the user.

At present, most users are not in a good network environment. The bandwidth of the network connection is small, and only supports 320*240 resolution video. However, some users' network environments can support more resolution video, such as 640*480 resolution. However, most of the video streams captured by the network cameras currently correspond to 320*240 resolution video, and cannot provide clearer video for users with greater resolution.

Embodiments of the present invention provide a method and device for switching video resolution, a terminal, and a handover system, which implement resolution switching in video communication.

An embodiment of the present invention provides a method for switching video resolution, including: determining that a video communication terminal establishes a video communication connection with a video receiving end, obtaining a video initial resolution of the video transmitting end, determining a bandwidth of the video communication connection, and determining the video communication. The hardware of the sender meets the preset conditions. The initial resolution of the video sender is switched to a target resolution, which is higher than the initial resolution.

Correspondingly, an embodiment of the present invention provides a video resolution switching apparatus, including: an acquiring unit, configured to determine that a video communication terminal establishes a video communication connection with a video receiving end, and obtains a video initial resolution of the video transmitting end; The first resolution of the video transmitting end is switched to the target resolution, and the target resolution of the video transmitting end is higher than the initial resolution.

An embodiment of the present invention further provides a terminal, including the foregoing video resolution switching device.

An embodiment of the present invention further provides a video resolution switching system, including a plurality of the foregoing terminals, for implementing video communication between a plurality of terminals.

According to the technical solution provided by the foregoing embodiments of the present invention, after establishing a video communication connection between terminals, determining the terminal hardware and bandwidth allowed by using video communication, the resolution of the terminal can be switched to provide the terminal user with Clearer video and guaranteed smooth switching of resolution.

The present invention will be further described in detail below with reference to the accompanying drawings.

At present, most of the video streams captured by the network camera correspond to 320*240 resolution video, which results in insufficient video display. The embodiment of the invention provides a method for switching video resolution, such as switching the resolution of the video from 320*240 resolution to 640*480 resolution, so as to provide clearer video communication for users who support greater resolution.

Embodiment 1

The first figure provides a flowchart of a method for switching video resolution according to an embodiment of the present invention. As shown in the first figure, the switching method includes:

11: Determine that the video sending end establishes a video communication connection with the video receiving end, and obtains the initial video resolution of the video sending end.

12: Determine the bandwidth of the video communication connection and the hardware of the video transmitting end meet the preset condition, and switch the initial resolution of the video sending end to the target resolution, and the target resolution is higher than the initial resolution.

The above steps 11 and 12 can be performed by the transmitting terminal or by a switching device.

It can be seen from the technical solution provided by the foregoing embodiments of the present invention that the resolution of the terminal can be switched under the condition that the bandwidth of the video communication connection and the terminal hardware allow. The initial resolution of the video sender is lower than the target resolution. For example, after the video transmitting end establishes a video communication connection with the video receiving end, the initial resolution of the video transmitting end is 320*240 resolution, and the target resolution holiday is set to a resolution of 640*480. Compared to the initial resolution of 320*240, the target resolution of 640*480 can provide clearer video communication for end users.

For example, determining the bandwidth of the video communication connection and the hardware of the video transmitting end according to the preset condition in step 12 may include: determining that the bandwidth of the video communication connection is greater than or equal to a bandwidth preset value, the bandwidth preset The value is set according to the size of the target resolution.

It is determined that the CPU frequency of the video sending end is greater than or equal to a preset frequency value, and the preset frequency value is set according to the size of the target resolution.

Optionally, after determining that the bandwidth of the video communication connection is greater than or equal to the preset value of the bandwidth, determining that the CPU frequency of the video sending end is greater than or equal to the preset frequency of the primary frequency, but the specific sequence is not limited.

Since the resolution of the target is higher than the resolution of the video transmitting end after the video transmitting end and the video receiving end establish a video communication connection, for example, the video stream of 640*480 resolution is equivalent to more than three times of the 320*240 resolution video stream, so The video transmitting end can transmit the video data to the video receiving end, and the bandwidth of the video communication connection needs to be greater than or equal to the bandwidth preset value.

Moreover, since the video transmitting end transmits the video stream of 640*480 resolution, the CPU consumption of the video transmitting end is relatively large, so it is necessary to determine whether the CPU's main frequency can withstand such a large consumption, for example, determining whether the CPU main frequency of the video transmitting end is greater than or equal to Or equal to the preset frequency.

Specifically, in step 12, determining the bandwidth of the video communication connection and the hardware of the video transmitting end meet the preset condition, the method further includes: determining that the frame rate of the video sending end at the initial resolution and the corresponding network packet loss rate are consistent. Pre-set conditions, such as: determining whether the frame rate at the initial resolution reaches the frame rate preset value and whether the corresponding network packet loss rate is less than or equal to the network packet loss rate preset value.

Since the bandwidth of the network does not necessarily represent the available bandwidth of the network in an actual network application, the bandwidth required for the frame rate under the equivalent target resolution is determined by increasing the frame rate at the initial resolution. Whether the frame rate under the initial resolution reaches the frame rate preset value, and whether the corresponding network packet loss rate is less than or equal to the network packet loss rate preset value. When it is determined that the frame rate under the initial resolution reaches the preset value of the frame rate, and the corresponding network packet loss rate is determined to be less than or equal to the preset value of the network packet loss rate, the network bandwidth can be considered to meet the requirement, and the video is sent. The initial resolution of the end is switched to the target resolution.

For example, for video data, video bandwidth = video resolution * video frame rate, the video bandwidth required for the low frame rate at 640 * 480 resolution is improved by increasing the high frame rate at 320 * 240 resolution. Moreover, if the video bandwidth is not allowed, the video data packet loss will be severe, and the frame rate under the resolution of 320*240 is increased, and the network is detected as packet loss. When the frame rate is greater than or equal to the frame rate preset value at 320*240 resolution, and the corresponding network packet loss rate is less than or equal to the network packet loss rate preset value, the video bandwidth satisfies the 640*480 resolution. Frame rate.

It can be known that after the video transmitting end establishes a video communication connection with the video receiving end, the video transmitting end can start the network camera to capture the video stream and output the video stream to the video receiving end. At this time, the resolution of the captured video stream is the initial resolution, The video stream is encoded and outputted. The resolution of the output video stream is also the initial resolution, which is not described here.

It can be seen that, in the method for switching the video resolution of the embodiment of the present invention, the initial resolution of the captured video at the video transmitting end can be switched to the target resolution, thereby converting the output resolution of the video transmitting end to the target resolution, and providing the terminal user with Clearer video communication.

In the method for switching the video resolution of the embodiment of the present invention, after determining the step 11 of establishing a video communication connection between the video transmitting end and the video receiving end, and simultaneously outputting the video stream with the video transmitting end, performing the determining the bandwidth of the video communication connection in step 12 And the hardware of the video sending end meets the preset condition and switches the resolution of the video sending end to the target resolution. In this way, when the resolution of the video transmitting end is switched to the target resolution process, the user's video communication realizes a smooth transition, that is, the video communication interruption or video communication caused by the bandwidth not allowed or the hardware is not supported after switching to the target resolution is avoided. Communication quality has declined.

Alternatively, the method for switching the video resolution of the embodiment of the present invention may be: after determining the step 11 of establishing a video communication connection between the video transmitting end and the video receiving end, waiting for determining the video communication connection. The bandwidth and the hardware of the video transmitting end are executed according to the preset conditions, and the video transmitting end outputs the video of the target resolution to the video receiving end. Although there will be a certain waiting time, the impact on the user experience of video communication is small due to the small waiting time.

In the method for switching the video resolution of the embodiment of the present invention, the video transmitting end can be understood as a video transmitting end device. Similarly, the video receiving end can be understood as a video receiving device.

For the video communication, the video receiving end corresponding to the video transmitting end can also be used as the video transmitting end, and the method for switching the video resolution of the embodiment of the present invention is also applicable. In this way, both sides of the video communication realize the switching of the video resolution by the method for switching the video resolution according to the embodiment of the present invention, thereby providing the terminal user with clearer video communication.

Embodiment 2

As shown in the second figure, an embodiment of the present invention provides a video resolution switching apparatus, including: The obtaining unit 21 is configured to determine that the video sending end establishes a video communication connection with the video receiving end, and obtains a video initial resolution of the video sending end.

The switching unit 22 is configured to determine the bandwidth of the video communication connection and the hardware of the video transmitting end meet the preset condition, and switch the initial resolution of the video sending end to the target resolution, and the target resolution of the video sending end is higher than the initial resolution.

According to the technical solution provided by the foregoing embodiments of the present invention, after establishing a video communication connection between terminals, determining the terminal hardware and bandwidth allowed by using video communication, the resolution of the terminal can be switched to provide the terminal user with Clearer video communication and smooth switching of resolution.

As shown in the third figure, the switching unit 22 may include: a first determining subunit 221, configured to determine that the bandwidth of the video communication connection is greater than or equal to the bandwidth pre- Set the value.

The second determining sub-unit 222 is configured to determine that the CPU main frequency of the video sending end is greater than or equal to the main frequency preset value, and the switching sub-unit 223 is configured to determine, according to the determining result of the first determining sub-unit 221 and the second determining sub-unit 222, Switch the initial resolution of the video sender to the target resolution.

The switching unit 22 may further include: a third determining sub-unit 224, configured to determine that the frame rate of the video sending end reaches the frame rate preset value and the corresponding network packet loss rate is less than or equal to the network packet loss at the initial resolution. Rate preset.

Further, the switching unit 22 may further include: an analysis subunit, configured to increase a frame rate at the initial resolution to be equivalent to a bandwidth required for a frame rate at the target resolution, and the third determining subunit 224 Determine whether the increased frame rate under the initial resolution reaches a frame rate preset value, and determine whether the corresponding network packet loss rate is less than or equal to a network packet loss rate preset value. Here, due to the video bandwidth=video resolution* video frame rate, the frame rate preset value may be: the bandwidth/initial resolution required for the frame rate at the target resolution. For the initial resolution, if the frame rate is increased, it is equivalent to increasing the bandwidth. Therefore, in the process of increasing the frame rate, when the increased frame rate reaches the preset frame rate, if the network packet loss rate of the corresponding frame rate is less than or equal to the network packet loss rate preset value, the current network The road bandwidth satisfies the target resolution and bandwidth requirements.

The switching device for the video resolution of the embodiment of the present invention and the components thereof can be understood by referring to the method for switching the video resolution provided by the foregoing embodiments, and details are not described herein.

Embodiment 3

As shown in the fourth figure, the video resolution switching device provided by the above embodiment, the present invention The embodiment further provides a terminal 40, which includes the video resolution switching device 41 provided by the above embodiment.

The video resolution switching device 41 is provided inside the terminal 40 or connected to the outside of the terminal 40.

The video resolution switching device 41 determines that the terminal 40 establishes a video communication connection with other terminals, determines the bandwidth of the video communication connection, and the hardware of the terminal 40 meets the preset condition, and switches the initial resolution of the terminal 40 to the target resolution. The target resolution is higher than the initial resolution.

According to the technical solution provided by the foregoing embodiments of the present invention, after establishing a video communication connection between terminals, determining the terminal hardware and bandwidth allowed by using video communication, the resolution of the terminal can be switched to provide the terminal user with Clearer video communication and smooth switching of resolution.

Embodiment 4

As shown in FIG. 5, based on the video resolution switching apparatus provided in the above embodiment, the embodiment of the present invention further provides a video resolution switching system 50, which includes a plurality of terminals 51 provided by the foregoing embodiments.

The video resolution switching system 50 includes two terminals 51 as an example, and the two terminals 51 are respectively video communication terminals, such as a video transmitting end and a video receiving end.

After establishing the video communication connection, the two terminals 51 respectively determine the bandwidth of the video communication connection and the respective hardware conform to the preset conditions, and switch the respective resolutions to the target resolution.

According to the technical solution provided by the foregoing embodiments of the present invention, after establishing a video communication connection between terminals, determining the terminal hardware and bandwidth allowed by using video communication, the resolution of the terminal can be switched to provide the terminal user with Clearer video communication and smooth resolution Switch.

As shown in FIG. 6 , a specific application flowchart of a method for switching video resolution according to an embodiment of the present invention illustrates a method for switching a resolution of a video from a resolution of 320*240 to a resolution of 640*480. In the sixth figure, video A is equivalent to the user terminal A of both parties of the video communication, and video B is equivalent to the user terminal B of both parties of the video communication. The method includes:

61. Both video and B have established a video connection with 320*240 resolution. Video A starts the network camera to capture the video stream of 320*240 resolution, and sends 320*240 resolution video stream to video B.

The video A and B establish a video connection, and the specific implementation of the video camera to capture and send the video stream is prior art, and will not be described here.

62. Video A continuously sends a plurality of data packets to video communication B through the connection channel.

For example, video A continuously sends 4 packets to video B through the connection channel.

63. Video B receives a plurality of data packets, and video B calculates the bandwidth according to the interval between the data packets, and sends the calculation result to the video camera A.

For example, video B receives 4 data packets sent by video A, and calculates a bandwidth greater than or equal to 60 KB according to the relationship between the number of transmitted data packets and the bandwidth, and proceeds to step 64, otherwise ends.

The foregoing steps 62 and 63 complete the measurement of the bandwidth. The specific implementation is the prior art, and details are not described herein. The bandwidth measurement is not limited to the implementation of steps 62 and 63, and other ways in which the bandwidth measurement can be implemented are also applicable.

64. Video A determines whether the CPU frequency is greater than or equal to the preset frequency.

In this step, since the target resolution is 640*480, the CPU consumption of the terminal is relatively large, so Need to determine whether the CPU's main frequency can withstand such a large consumption. In this embodiment, if the CPU main frequency is greater than or equal to the dual core frequency of 2.0 GHz, the process proceeds to step 65, otherwise it ends.

Step 64 can be understood as a local hardware check. The local hardware check is not limited to the judgment of the CPU frequency in step 64, and other methods may be used.

65. Video A increases the frame rate of the resolution of 320*240 video at the same time, and performs packet loss detection.

By increasing the frame rate at 320*240 resolution to achieve the bandwidth required for the frame rate at 640*480 resolution, if the frame rate is greater than or equal to 20 frames at 320*240 resolution, the corresponding network packet loss The rate is less than or equal to 3%, and the bandwidth is determined to satisfy the frame rate under 640*480 resolution video, and the process proceeds to step 66, otherwise it ends.

66. Video A sends a signal to notify Video B that it can enable 640*480 resolution video.

For example, Video A sends a video display VGA (Video Graphic Array) video information to Video B, which tells Video B that it can enable 640*480 resolution video.

67. Video B receives the notification signal sent by Video A. Video B confirms to accept the video of 640*480 resolution and sends an acknowledgement signal to Video A.

For example, video B sends an acknowledgment signal to trigger video com to initiate a VGA video request.

68. Video A receives the confirmation signal of Video B, activates the network camera to capture the video stream of 640*480 resolution, and sends a video stream of 640*480 resolution to Video B.

For example, Video A outputs a 640 video stream of 640*480 resolution.

In the above steps 61-68, the process of switching the video resolution from 320*240 to 640*480 is completed.

For video B, it can also switch from 320*240 to 640*480, which is similar to the above steps 62-68, and will not be described here.

It can be seen from the technical solution provided by the foregoing embodiments of the present invention that video communication is established between terminals. After the connection is made, it is determined that the resolution of the terminal can be switched under the condition that the terminal hardware and the bandwidth of the video communication are allowed, so that the terminal user can provide clearer video communication and ensure smooth switching of the resolution.

It should be noted that, for the foregoing embodiments, for the sake of brevity, they are all described as a series of action combinations, but those skilled in the art should understand that the present invention is not limited by the described action sequence, because Invented, certain steps may be performed in other orders or simultaneously. In the following, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

In the above embodiments, the descriptions of the various embodiments are different, and the details that are not detailed in a certain embodiment can be referred to the related descriptions of other embodiments.

A person skilled in the art can understand all or part of the process of implementing the above embodiments, and can execute the related hardware by a computer program, and the program can be stored in a computer readable storage medium. The flow of an embodiment of each of the above methods may be included. The storage medium may be a magnetic disk, a optical disk, a read-only memory (ROM), or a random access memory (RAM).

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

21‧‧‧Acquisition unit

22‧‧‧Switch unit

221‧‧‧First identified subunit

222‧‧‧Secondary subunit

223‧‧‧Switch subunit

224‧‧‧ third determining subunit

40‧‧‧ Terminal

41‧‧‧Switching device

50‧‧‧Switching system

51‧‧‧ Terminal

1 is a flowchart of a method for switching video resolution according to an embodiment of the present invention; and FIG. 2 is a schematic structural diagram of a video resolution switching device according to an embodiment of the present invention; 3 is a schematic structural diagram of a video resolution switching apparatus according to another embodiment of the present invention; FIG. 4 is a schematic structural diagram of a terminal according to an embodiment of the present invention; and FIG. 5 is a schematic diagram of a video resolution switching system according to an embodiment of the present invention; FIG. 6 is a flow chart showing an application of a method for switching video resolution according to an embodiment of the present invention.

Claims (8)

A method for switching video resolution, the method comprising: determining that a video communication terminal establishes a video communication connection with a video receiving end, obtaining a video initial resolution of the video transmitting end; determining a bandwidth of the video communication connection and a hardware of the video transmitting end The initial resolution of the video sending end is switched to the target resolution, and the target resolution is higher than the initial resolution; wherein the bandwidth of the video communication connection and the hardware of the video sending end meet the preset condition. The method includes: determining that the bandwidth of the video communication connection is greater than or equal to the bandwidth preset value; determining that the CPU main frequency of the video sending end is greater than or equal to the preset frequency of the primary frequency. The method of claim 1, wherein determining the bandwidth of the video communication connection and the hardware of the video transmission end meet the preset condition further includes: determining that the frame rate of the video transmission end reaches the initial resolution The frame rate preset value and the corresponding network packet loss rate are less than or equal to the network packet loss rate preset value. The method of claim 2, wherein determining that the frame rate of the video sender reaches the frame rate preset value at the initial resolution, and the corresponding network packet loss rate is less than or equal to the network packet loss rate. Setting a value includes: increasing a frame rate at the initial resolution, determining that the increased frame rate reaches a frame rate preset value, and determining that the network packet loss rate corresponding to the increased frame rate is less than or equal to a network packet loss rate. default value. A device for switching video resolution, the device comprising: an obtaining unit, configured to determine that a video communication terminal establishes a video communication connection with a video receiving end, and obtains Obtaining an initial video resolution of the video transmitting end; the switching unit is configured to determine a bandwidth of the video communication connection and a hardware of the video transmitting end meets a preset condition, and switch the initial resolution of the video transmitting end to a target resolution, where The target resolution of the video transmitting end is higher than the initial resolution; wherein the switching unit includes: a first determining subunit, configured to determine that a bandwidth of the video communication connection is greater than or equal to a bandwidth preset value; and a second determining subunit, The CPU is configured to determine that the CPU frequency of the video sending end is greater than or equal to the preset frequency of the primary frequency; and the switching subunit is configured to perform initial parsing of the video sending end according to the determining result of the first determining subunit and the second determining subunit. Switch to the target resolution. The device of claim 4, wherein the switching unit further comprises: a third determining sub-unit, configured to determine that a frame rate of the video transmitting end at an initial resolution reaches a frame rate preset value, and a corresponding The network packet loss rate is less than or equal to the network packet loss rate preset. The apparatus of claim 5, wherein the switching unit further comprises: an analysis subunit, configured to increase a frame rate at the initial resolution, wherein the third determining subunit is configured to determine that the increased frame rate is greater than Or equal to the frame rate preset value, and determine that the corresponding network packet loss rate is less than or equal to the network packet loss rate preset value. A terminal includes a video resolution switching device according to any one of claims 4-6. A switching system for video resolution includes a plurality of terminals as described in claim 7 of the patent application for implementing video communication between the plurality of terminals.