WO2011022974A1

WO2011022974A1 - Method for controlling video quality of mobile video phone and mobile video phone

Info

Publication number: WO2011022974A1
Application number: PCT/CN2010/071894
Authority: WO
Inventors: 万超; 阙石峰; 蔡亚南
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-08-24
Filing date: 2010-04-19
Publication date: 2011-03-03
Also published as: CN101998102A

Abstract

A method for controlling video quality of a mobile video phone and a mobile video phone are provided in the present invention. It is used for solving the technical problem of controlling the quality of received video data by a video data reception end user. By using the present invention, in the case of relatively harsh network environment, the user can select satisfying video quality, and the Bit Error Rate (BER) condition of the reception end during reception is fed back to the transmission end by using feedback information, then the video encoding quality of video data is adjusted by the transmission end according to the feedback information. Thus the mosaic in the video is reduced, and the clarity and the smoothness are retained all the time during the whole video call. In the case of relatively good network environment, clearer video images can be provided. The passive condition of merely receiving video data is avoided, and the user experience is enhanced.

Description

Method for controlling video quality of mobile videophone and mobile videophone

The present invention relates to mobile communication technologies, and more particularly to a method of controlling video quality of a mobile videophone and a mobile videophone. Background technique

With the development of mobile communication technology, mobile videophone has begun to get a wide range of applications. It is a multimedia communication tool that integrates images and voices. It can help people face-to-face real-time communication and realize the sound of people talking. See also the wishes of their people.

To further standardize the technical standards of video telephony, the Third Generation Partnership Project (3GPP) proposed the 3G-324M protocol suite, which includes H.223 multiplexing protocol, H.245 session control protocol, Video and audio coding protocols, etc. The H.245 session control protocol supports User Input Indication (UII) transmission, which plays an important role in all application services of user interaction. For video message services, typical UII applications generally provide user preference. , message recording and query, and regular mailbox management. H.245 provides a reliable signaling protocol to ensure that various messages can be reliably transmitted.

The mobile communication channel is a transmission environment with a relatively high bit error rate, and video communication is very sensitive to the bit error rate. The quality of the videophone is often not guaranteed, especially in the case of high bit stream, the receiving end often appears. There are many mosaics, and the video has a delay.

In the process of implementing the present invention, the inventors found that at least the following problems exist in the prior art: In the past videophone application process, the user can only passively receive data through the receiving end, and cannot request and control the video quality. Summary of the invention

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of controlling video quality of a mobile videophone and a mobile videophone that enables the receiving end to control the video quality of the received video data.

In order to achieve the object of the present invention, the present invention uses the following technical solutions:

A method of controlling video quality of a mobile videophone, the method comprising:

Receiving, by the first videophone, the video data sent by the second videophone, obtaining feedback information about the video quality, and transmitting the feedback information to the second videophone;

The second videophone adjusts the encoding quality of the video data to be sent to the first videophone in accordance with the feedback information.

Further, the feedback information is information that the first videophone determines for the second videophone according to the adjustment policy corresponding to the demand option selected by the user, and performs video quality adjustment on the video data to be sent.

When the user selects a smooth priority demand option, the first videophone first performs a bit error rate detection on the received video data, obtains a bit error rate of the current video, and then determines the feedback information according to the smooth priority adjustment policy. The feedback information is: bit error rate, or bit error rate level, or sharpness indication.

When the user selects the quality priority demand option, the first videophone does not perform error rate detection on the first video data, and directly feeds the second videophone a quality error corresponding bit error rate or a bit error rate level.

Further, if the feedback information includes a bit error rate or a bit error rate level higher than a bit error rate or a bit error rate level currently used by the second videophone, or the resolution indication included in the feedback information is reduced in clarity The second videophone increases a compression ratio of video data to be sent to the first videophone;

If the feedback information includes a bit error rate or a bit error rate level lower than a bit error rate or a bit error rate level currently used by the second videophone, or the resolution indication included in the feedback information is to improve clarity The second videophone reduces the compression ratio of the video data to be transmitted to the first videophone.

Based on the above method, the present invention also provides a mobile videophone, including:

An obtaining unit, configured to obtain feedback information about video quality of currently received video data; a transceiver unit, configured to receive video data and feedback information about video quality sent by the peer mobile videophone, and move to the opposite end The videophone sends the video quality feedback information obtained by the acquiring unit;

The adjusting unit is configured to adjust the encoding quality of the video data to be sent according to the feedback information about the video quality fed back by the peer mobile videophone.

Further, the mobile videophone further includes:

The demand option selection unit is configured for the user to select different demand options according to requirements, and the at least includes: smooth priority and quality priority.

Further, when the user selects a smooth priority demand option, the acquiring unit is further configured to perform error rate detection on the received video data, and determine the feedback information according to an adjustment policy according to a smooth priority; the feedback The information is: bit error rate, or bit error rate level, or sharpness indication. When the user selects the quality priority demand option, the acquiring unit does not perform error rate detection on the first video data, and directly determines the error rate corresponding to the quality priority or the error rate level as the feedback information.

Further, if the feedback information includes a bit error rate or a bit error rate level higher than a currently used error rate or bit error rate level, or the resolution information included in the feedback information indicates that the resolution is reduced, The adjusting unit increases the compression ratio of the video data to be sent to the opposite videophone;

If the feedback information includes a bit error rate or a bit error rate level lower than a currently used error rate or bit error rate level, or the sharpness indication included in the feedback information indicates that the sharpness is improved, the adjusting unit decreases The compression ratio of the video data to be sent to the peer videophone.

Through the invention, the user of the videophone selects different video qualities according to his own needs. The feedback information corresponding to the video quality of the receiving end is sent to the transmitting end, and the video data is adjusted by the transmitting end, so that the user of the videophone can enable the receiving end to control the video quality of the received video data. DRAWINGS

1 is a schematic flowchart of a method for controlling video quality of a mobile videophone according to an embodiment of the present invention; FIG. 2 is a schematic flowchart of a method for controlling fluency and quality according to an embodiment of the present invention; FIG. 3 is a schematic diagram of a TD-SCDMA system according to an embodiment of the present invention; FIG. 4 is a schematic structural diagram of a mobile videophone according to an embodiment of the present invention. detailed description

The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. In the embodiment provided by the present invention, the videophone user can feedback the error rate status of the received video data to the transmitting end to adjust the video encoding quality. Among them, the bit error rate refers to the error rate in data transmission, that is, the ratio of transmitting the wrong symbol and all transmitted symbols in the transmission, which is an important criterion for measuring the quality of the communication of the computer network.

1 is a flow chart of a method for controlling video quality of a mobile videophone according to the present invention, the method including:

Step 101: The first videophone receives the first video data of the second videophone.

Step 102: Acquire feedback information about video quality for the first video data, and send the feedback information to the second videophone.

Step 103: The first videophone receives second video data from the second videophone, where the second video data is obtained by adjusting, by the second videophone, the video data to be sent according to the feedback information. Video data.

Applying the technology provided in this embodiment, the user of the videophone selects according to his or her own needs. The same demand option, the demand indication of the video quality of the receiving end is fed back to the sending end of the video as feedback information, and the video coding of the video data to be sent by the originating end is adjusted, thereby realizing the user of the videophone to receive the video data. Video quality selection and control.

Before the first videophone receives and receives the first video data, the method further includes:

a setting step, the first videophone sets different demand options, and the demand option corresponds to different requirements for video quality; for each of the demand options, configuring different levels of error rate and/or corresponding to the demand option Different levels of clarity identification.

The first videophone obtains the feedback information and feeds it back to the second videophone, specifically: the first videophone selects at least one demand option among different requirement options, and according to the at least one The demand option performs corresponding detection or directly obtains an indication from the user, thereby obtaining the feedback information.

The second videophone adjusts the first video data to be sent to the first videophone according to the feedback information, and the manner of the adjustment is specifically: adjusting the encoding of the second video data.

The information that is used by the first videophone to determine the video quality of the second video data determined by the second videophone according to the demand option selected by the user may be: Rate, bit error rate level or sharpness indication;

When the feedback information includes a bit error rate, the second videophone adjusts the encoding of the second video data according to the error rate included in the feedback information;

When the feedback information includes a bit error rate level, the second videophone adjusts the encoding of the second video data according to the bit error rate corresponding to the bit error rate level included in the feedback information;

When the feedback information includes a sharpness indication, the second videophone adjusts the encoding of the second video data according to the sharpness indication included in the feedback information;

The first videophone determines the feedback information according to an adjustment policy corresponding to the demand option selected by the user, and the demand option may be a smooth priority or a quality priority. Confirm feedback letter The method of interest can be:

(1) When the user selects a smooth priority demand option, the first videophone first performs a bit error rate detection on the first video data, obtains a bit error rate of the current video, and then determines a feedback to be fed back according to the smooth priority adjustment policy. Feedback;

The smooth priority adjustment strategy may be: the first videophone determines an optimal bit error rate, bit error rate level or clarity suitable for the current network condition according to the current network condition and ensuring smooth video. The degree indication is fed back to the sender as feedback information.

For example, if the bandwidth allowed by the current network condition can ensure the smooth playback of the video data with the bit error rate X, the first videophone feeds X as feedback information to the second videophone, and the second videophone uses the bit error rate. X encodes the second video data. Here, X can be regarded as a threshold. When the current bit error rate is lower than X, using X as feedback information is equivalent to requiring the second videophone to increase the compression ratio of the second video data; otherwise, it is equivalent to requiring the second. The videophone reduces the compression ratio of the second video data.

When the error rate included in the feedback information is higher than the currently used error rate threshold, the second videophone increases the compression ratio of the video data to be transmitted to the first videophone;

When the error rate included in the feedback information is lower than the currently used error rate threshold, the second videophone reduces the compression ratio of the video data to be transmitted to the first videophone.

If the feedback information is a sharpness indication, the first videophone needs to be compared with X according to the error rate of the current video. If the current video has a bit error rate greater than X, the sharpness indication is “increased sharpness”, if less than X, the sharpness indication is "lower definition".

(2) When the user selects the quality priority demand option, the first videophone may not perform error rate detection on the first video data, but directly feed back the error rate or the error corresponding to the quality priority to the second videophone. Rate level.

2 is a flow chart of a method for controlling the fluency and quality of a videophone according to a preferred embodiment of the present invention, and the specific steps are as follows: Step 201: setting different demand options, where the demand option corresponds to different requirements of the user for the video quality of the communication; for each demand option, configuring the demand option corresponds to different levels of bit error rate range and/or different levels of clarity. The degree includes: configuring the range of the bit error rate levels of each level, and performing the convention of the code compilation and coding rules between the video phones, wherein the feedback information is generated according to the password compilation code rules.

Without loss of generality, in this embodiment, only the communication between two videophones is taken as an example for description. Step 202: A link is established between the two videophones, and the two parties can perform a video call normally. Step 203: The receiving end videophone determines whether the demand option selected by the receiving user is “smooth priority” or “quality first”. If the smooth priority is selected, go to step 204, otherwise go to step 207.

Step 204: The receiving end starts the error rate detection function by the visible telephone, starts a periodic statistical error rate, and obtains a bit error rate for the currently received video data.

Step 205: The receiving end visual telephony obtains a current bit error rate level according to a bit error rate range in which the current bit error rate is located, and determines a bit error rate level to be fed back according to the smooth priority policy.

Step 206: Encode the error rate level to be fed back according to the cipher encoding rule agreed in step 201, and send the obtained code as feedback information to the originating UE. The feedback here is specifically a password. Go to step 208.

Step 207, the error rate detection function is turned off, and the information selected by the user to select "quality priority" is cipher encoded, and is fed back to the originating UE as feedback information. The feedback information here is specifically a password.

Step 208: After receiving the feedback information, the transmitting UE decodes the cipher encoding rule according to the procedure in step 201. When the "quality priority" command is obtained, the encoding quality of the video data is adjusted according to the optimal quality encoding. Sending; When the result is not the "quality first" command, but the bit error rate level of the feedback of the receiving UE, the bit error rate level is extracted, and the originating UE adjusts the coding quality according to the obtained bit error rate level.

In this embodiment, the call is only made between two videophones, and the demand option is limited to between smooth priority and quality priority, and the feedback information is obtained through detection, and the feedback information is sent to The originating UE adjusts the coding rate or coding mode of the video data sent to the receiving end according to the feedback information, so that the videophone user can select the required video quality by himself, and realizes the control of the quality of the video data at the receiving end.

In step 201, different levels of bit error rate and/or different levels of resolution corresponding to the requirement options need to be configured. Specifically, as shown in Table 1, the four-level error rate level is configured, and the cipher coding rules of the feedback information are agreed.

Four-level error rate rating

In the case of a poor network environment, the application of "smooth priority", as the bit error rate increases from left to right, the video picture can still be kept smooth, because the network environment is poor, the error is wrong. The rate is higher. At this time, the application of "smooth priority" increases the video compression ratio, which helps to reduce the network pressure and reduce the bit error rate. Although the picture at the end is blurred, the picture is smoother.

The data generated by the above configuration needs to be stored in advance in the memory of the videophone.

For the definition, a correspondence similar to that in Table 1 can be used, but for convenience of description in the present invention, only two operations are set for the definition: improving sharpness and reducing sharpness.

Since 3G technology is currently a communication technology that can be selected by users, and more and more users tend to select terminals with 3G functions, a specific implementation scheme is proposed to further explain the present invention; A call is made between A and videophone B, as shown in FIG. 3, including:

Step 301: A link is established between the videophone A and the videophone B through a time division duplex synchronous code division multiple access (TD-SCDMA) network.

At the same time, different demand options are set, the demand options and the different needs of the user for the call Corresponding; For each demand option, the demand option can be configured to correspond to different levels of bit error rate range and/or different levels of clarity. For example, based on Table 1, a four-level error rate range is configured, and the generated data needs to be pre-stored in the memory of the videophone; the cryptographic coding rules are agreed between the videophones.

In step 302, the two parties adjust the quality of the video data according to the default setting.

After the link is established, both parties can see the other party's video and can make a call.

Step 303: The videophone B determines a demand option selected by the user;

Videophone B opens the menu with the option "Video Quality". When selected, the pop-up menu has the options "Smooth Priority" and "Quality Priority".

If it is determined that the user selects the "Smooth Priority" option, go to step 304; if it is determined that the user selects "Quality Priority", go to step 309.

Step 304, the videophone B starts the error rate detection function;

During the detection process, with a period of 200 milliseconds (ms), the error rate in one cycle is counted based on the detection parameters of the channel code.

Since it is a TD-SCDMA wireless network, in TD-SCDMA, the basic unit of data exchange between the medium access control (MAC) layer and the physical layer is a transport block (TB), and the physical layer will send these TBs before Add CRC check information (Cyclicl Redundncy Check) for each transport block. Therefore, videophone B can derive from the CRC information whether each TB transmitted by videophone A is faulty. By collecting CRC error information over a period of time, the current network quality status can be derived.

Step 305: The videophone B compares the obtained error rate as the detection parameter with the range of error rate stored in the phone (as shown in Table 1), and the range of the error rate corresponds to the current error rate. The level.

Step 306: The videophone B determines the bit error rate level to be fed back according to the smooth priority adjustment policy, and obtains a password according to the stored password encoding rule, and the password is a feedback letter. Information, send the feedback information to the videophone.

Specifically, the password can be mapped to a dual tone multi-frequency (DTMF) pulse signal and transmitted to the videophone A through the H.245 protocol.

Step 307, the videophone A receives the DTMF signal, and decodes it according to the cipher coding rule stipulated in step 301, to obtain the error rate level fed back by the videophone B.

Step 308: The videophone A adjusts the coding quality according to the error rate level of the feedback; for example, increasing or decreasing the video compression ratio, lengthening or compressing the I/P frame interval of the video data, and the like.

The process of increasing or decreasing the video compression ratio may be formed by a corresponding relationship with the bit error rate level described in Table 1. For example, the video compression ratio when Perfect is 3, and the compression ratio when Good is 6 Normal compression ratio is 10, and Bad is 16 compression ratio. The larger the video compression ratio, the worse the quality of the image, but the smaller the data stream of the image, the lower the network pressure at the receiving end, which helps to make the video picture smoother.

Go to step 313.

In step 309, since the videophone B user selects "quality priority", the bit error rate is not detected.

In step 310, the "quality first" is translated into the password "000", and the password is set to a DTMF pulse, which is sent to the videophone.

Step 311: After receiving the password "000", the videophone A decodes the information, and the obtained information is an encoding strategy using "Prefect".

Step 312, the videophone A adjusts the video compression ratio of the video data sent to the videophone B to 3, and encodes the video according to the best quality.

Step 313, ending the current adjustment of the video data.

Step 314, when the user hangs up the videophone, save the current setting and end the session.

FIG. 4 is a mobile videophone provided by the present invention, including an acquiring unit, a transceiver unit, and an adjusting unit. The obtaining unit is configured to obtain feedback information about a video quality of currently received video data;

The transceiver unit is configured to receive video data sent by the peer mobile videophone and feedback feedback information about the video quality, and send the video quality feedback information obtained by the acquiring unit to the peer mobile videophone;

Preferably, the mobile videophone further includes a demand option selection unit, configured to select different demand options according to requirements, the at least comprising: smooth priority and quality priority. During the video call, the user at the receiving end can select the corresponding demand option according to the needs of the video.

Preferably, when the user selects a smooth priority demand option, the acquiring unit is further configured to perform error rate detection on the received video data, and determine the feedback information according to an adjustment policy according to a smooth priority; the feedback The information is: bit error rate, or bit error rate level, or sharpness indication.

Preferably, when the user selects the quality-first demand option, the acquiring unit does not perform error rate detection on the first video data, and directly determines the error rate corresponding to the quality priority or the error rate level as the feedback information.

Preferably, if the feedback information includes a bit error rate or a bit error rate level higher than a currently used error rate or bit error rate level, or the resolution information includes a resolution indicating that the resolution is reduced, The adjusting unit increases the compression ratio of the video data to be sent to the opposite videophone;

The embodiment of the present invention has the following beneficial effects, so that the receiving end user can control the quality of the received video data, and in the case that the network environment is relatively poor, the user selects the satisfactory video quality by himself. The amount, and the bit error rate received by the receiving end can be fed back to the transmitting end, and the video encoding quality is adjusted by the transmitting end, which can reduce the mosaic in the video, so that the entire video call process is always clear and smooth. In the case of a better network environment, it can provide a clearer video picture. It is separated from the passive situation of simply receiving video data, enhancing the user experience.

It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not limited thereto. All the parameter values may be adjusted according to actual conditions, and are within the scope of the rights protection. A person skilled in the art should understand that the technical solutions of the present invention may be modified or equivalent, without departing from the spirit and scope of the present invention, and should be included in the scope of the claims of the present invention.

Claims

Claim

A method for controlling video quality of a mobile videophone, the method comprising: receiving, by a first videophone, video data sent by a second videophone, obtaining feedback information about video quality, and Sending feedback information to the second videophone;

The method according to claim 1, wherein the feedback information is determined by the first videophone according to an adjustment policy corresponding to a demand option selected by the user for the second videophone, and is used for the video to be sent. Data for video quality adjustment information.

3. The method according to claim 2, wherein when the user selects a smooth priority demand option, the first videophone first performs error rate detection on the received video data to obtain a bit error rate of the current video. And determining, according to the smooth priority adjustment policy, the feedback information, where the feedback information is: a bit error rate, or a bit error rate level, or a sharpness indication.

The method according to claim 2, wherein when the user selects the quality priority demand option, the first videophone does not perform error rate detection on the first video data, and directly returns quality to the second videophone. Priority corresponding to the bit error rate, or bit error rate level.

5. A method according to claim 3 or 4, characterized in that

If the feedback information includes a bit error rate or a bit error rate level higher than a bit error rate or a bit error rate level currently used by the second videophone, or the resolution information included in the feedback information indicates that the resolution is reduced, The second videophone increases a compression ratio of video data to be sent to the first videophone;

If the feedback information includes a bit error rate or a bit error rate level lower than a bit error rate or a bit error rate level currently used by the second videophone, or the resolution indication included in the feedback information is to improve the definition, The second videophone reduces a compression ratio of video data to be transmitted to the first videophone.

6. A mobile videophone, comprising:

The mobile videophone according to claim 6, further comprising: a demand option selection unit, configured to select different demand options according to requirements, the at least comprising: smooth priority and quality priority.

8. The mobile videophone of claim 7 wherein:

The obtaining unit is further configured to perform error rate detection on the received video data, and determine the feedback information according to a smooth priority adjustment policy; the feedback information is: Bit error rate, or bit error rate level, or sharpness indication.

9. The mobile videophone of claim 7 wherein:

When the user selects the quality priority demand option, the acquiring unit does not perform error rate detection on the first video data, and directly determines the error rate corresponding to the quality priority or the bit error rate level as the feedback information.

10. A mobile videophone according to claim 8 or 9, wherein

If the feedback information includes a bit error rate or a bit error rate level higher than a currently used error rate or bit error rate level, or the resolution information included in the feedback information indicates that the resolution is lowered, the adjustment unit improves The compression ratio of the video data to be sent to the peer videophone;