CN107070806B - Data transmission method and device - Google Patents
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- CN107070806B CN107070806B CN201710244807.3A CN201710244807A CN107070806B CN 107070806 B CN107070806 B CN 107070806B CN 201710244807 A CN201710244807 A CN 201710244807A CN 107070806 B CN107070806 B CN 107070806B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/12—Avoiding congestion; Recovering from congestion
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T15/00—3D [Three Dimensional] image rendering
- G06T15/005—General purpose rendering architectures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
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Abstract
The embodiment of the invention provides a data transmission method and device, relates to the technical field of communication, and aims to reduce the accumulation of image data transmission instructions and improve the smoothness of image data transmission by calculating the current network bandwidth and adjusting the sending time interval of image operation instructions according to the current network bandwidth. Wherein, the method comprises the following steps: firstly, the client side obtains the time length of receiving a specified image and the size of the specified image; then, the client determines the current bandwidth according to the duration of receiving the designated image by the client and the size of the designated image; therefore, the client sends the operation instruction of data transmission to the image server according to the sending time interval corresponding to the current bandwidth. The embodiment of the invention is suitable for the three-dimensional image data transmission process.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for data transmission.
[ background of the invention ]
With the development of medical technology and the continuous advance of hierarchical diagnosis and treatment, the demand of data sharing of medical data through a communication network is more and more urgent. However, most medical institutions have different network bandwidths, and when data transmission is realized by each medical institution, particularly in the process of three-dimensional image data transmission, data transmission is blocked.
In the current communication technology field, the problem of data transmission is solved by reducing the resolution of a three-dimensional image. Since the image rendering quality required in medical diagnosis is relatively high, the method of reducing the transmission of image data by lowering the resolution of an image is obviously not suitable for medical diagnosis. In addition, although there have been some studies related to medical image data transmission in recent years, the studies are based on two-dimensional image technology, and no mature solution has been proposed for the katon phenomenon generated when data of three-dimensional images are transmitted at a low bandwidth.
[ summary of the invention ]
In view of this, embodiments of the present invention provide a method and an apparatus for data transmission, which can reduce the accumulation of image data transmission instructions and improve the smoothness of image transmission by calculating the current network bandwidth and adjusting image operations according to the current network bandwidth.
In a first aspect, an embodiment of the present invention provides a data transmission method, which is applicable to a data processing system, where the data processing system includes a client and an image server, and the method includes:
the client acquires the time length of receiving a specified image and the size of the specified image;
the client determines the current bandwidth according to the duration of receiving the designated image by the client and the size of the designated image;
and the client sends an operation instruction of data transmission to the image server according to the sending time interval corresponding to the current bandwidth.
The above-mentioned aspect and any possible implementation manner further provide an implementation manner, before the client acquires a duration for receiving the designated image by itself and a size of the designated image, including:
the client sends a request message for acquiring the specified image to the image server and records a first sending moment;
the client receives the appointed image sent by the image server and records first receiving time;
and the client determines the time length of the client for receiving the specified image according to the first sending time and the first receiving time.
There is further provided in accordance with the above-described aspect and any possible implementation, an implementation, the data processing system further comprising a rendering server.
The above-mentioned aspect and any possible implementation manner further provide an implementation manner, before the client receives the specific image sent by the video server and records a first receiving time, including:
the image server responds to the request message to acquire a designated image identifier;
the video server sends an image rendering request message to a rendering server and records second sending time, wherein the image rendering request message comprises the specified image identifier;
the rendering server acquires the specified image according to the specified image identifier;
the video server receives the designated image sent by the rendering server;
and the video server sends the specified image to the client and records a third sending moment.
The foregoing aspect and any possible implementation manner further provide an implementation manner, where determining, according to the first sending time and the first receiving time, a time length for the client itself to receive the specified image includes:
the image server determines the duration of acquiring the designated image according to the second sending time and the third sending time;
and the client determines the time length of the client for receiving the specified image according to the first sending time, the first receiving time and the time length of the specified image acquired by the video server.
The foregoing aspect and any possible implementation manner further provide an implementation manner, where after the determining, by the client, a current bandwidth according to a duration of receiving the specified image by the client and a size of the specified image, the determining includes:
the client determines a current image rendering frame rate according to the current bandwidth and the size of the specified image;
and the client determines a sending time interval corresponding to the current bandwidth according to the current image rendering frame rate.
In a second aspect, an embodiment of the present invention provides a data transmission apparatus, where the apparatus includes a client, an image server:
the client is used for acquiring the time length of receiving the designated image and the size of the designated image;
the client is further used for determining the current bandwidth according to the duration of receiving the designated image and the size of the designated image;
and the client is also used for sending an operation instruction of data transmission to the image server according to the sending time interval corresponding to the current bandwidth.
The above-described aspects and any possible implementations further provide an implementation, where the apparatus further includes:
the client is also used for sending a request message for acquiring the specified image to the image server and recording a first sending moment;
the client is also used for receiving the appointed image sent by the image server and recording first receiving time;
and the client is further used for determining the time length of the client for receiving the specified image according to the first sending time and the first receiving time.
The above-described aspects and any possible implementations further provide an implementation in which the apparatus further includes a rendering server.
The above-described aspects and any possible implementations further provide an implementation, the apparatus comprising:
the image server is used for responding to the request message and acquiring a designated image identifier;
the video server is further configured to send an image rendering request message to the rendering server and record second sending time, where the image rendering request message includes the specified image identifier;
the rendering server is further used for acquiring the specified image according to the specified image identifier;
the video server is further used for receiving the designated image sent by the rendering server;
and the video server is also used for sending the specified image to the client and recording a third sending moment.
The above-described aspects and any possible implementations further provide an implementation, the apparatus comprising:
the video server is further configured to determine a duration for acquiring the designated image according to the second sending time and the third sending time;
the client is further configured to determine a duration for the client to receive the designated image according to the first sending time, the first receiving time, and a duration for the image server to obtain the designated image.
The above-described aspects and any possible implementations further provide an implementation, the apparatus comprising:
the client is further used for determining a current image rendering frame rate according to the current bandwidth and the size of the specified image;
the client is further configured to determine a sending time interval corresponding to the current bandwidth according to the current image rendering frame rate.
The embodiment of the invention provides a method and a device for data transmission.A client in a data transmission system determines the current bandwidth by acquiring the time length of receiving a designated image and the size of the designated image, thereby determining the sending time interval corresponding to the current bandwidth according to the current bandwidth, and sending an operation instruction for data transmission to an image server according to the sending time interval corresponding to the current bandwidth. Compared with the prior art, the embodiment of the invention dynamically adjusts and sends the instruction of the data transmission operation according to the state of the current bandwidth by determining the current network bandwidth, thereby avoiding the problems of network blockage and operation delay caused by a large amount of data transmission due to accumulation of the operation instruction, further improving the speed of data transmission and improving the fluency of image data transmission.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a schematic flow chart of a method for data transmission according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of another data transmission method according to an embodiment of the present invention;
fig. 3 is a flow chart illustrating another method for data transmission according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating another data transmission method according to an embodiment of the present invention;
fig. 5 is a flow chart illustrating another method for data transmission according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another apparatus for data transmission according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that although the terms first, second and third may be used to describe the transmission timings in the embodiments of the present invention, these transmission timings should not be limited to these terms. These terms are only used to distinguish transmission times from each other. For example, the first transmission time may also be referred to as the second transmission time, and similarly, the second transmission time may also be referred to as the first transmission time without departing from the scope of the embodiments of the present invention.
The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
The embodiment of the present invention provides a data transmission method, which is applicable to a data processing system, where the data processing system includes a client and an image server, and as shown in fig. 1, the method includes:
101. the client acquires the time length for receiving the designated image and the size of the designated image.
The time length for the client to receive the specified image is the time required by the client from the sending of the request message for acquiring the specified image to the final receiving of the specified image.
The size of the image refers to the number of bytes occupied by the stored information in the image.
The designated image is a three-dimensional image obtained by processing a two-dimensional image through a related image rendering algorithm. Two-dimensional images in the field of medical diagnostics generally refer to raw examination data of a patient, for example, a Computed Tomography (CT) image, an MR (Magnetic Resonance) image, etc., of a patient's examination.
102. And the client determines the current bandwidth according to the time length of the client receiving the designated image and the size of the designated image.
The current bandwidth refers to the capability of the network communication channel for transmitting data when the client and the image server perform data transmission.
The client determines the current bandwidth as the quotient of the size of the specified image and the time length of the specified image received by the client.
103. And the client sends an operation instruction of data transmission to the image server according to the sending time interval corresponding to the current bandwidth.
The time interval of the operation instruction of data transmission sent by the client to the image server is adjusted in real time according to the current bandwidth, so that the accumulation of the operation instruction is avoided, the current bandwidth is guaranteed to run at full load all the time, and the data transmission speed is increased.
The embodiment of the invention provides a data transmission method, wherein a client in a data transmission system determines the current bandwidth by acquiring the time length of receiving a designated image and the size of the designated image, so as to determine the sending time interval corresponding to the current bandwidth according to the current bandwidth, and sends an operation instruction of data transmission to an image server according to the sending time interval corresponding to the current bandwidth. Compared with the prior art, the embodiment of the invention has the advantages that the current network bandwidth is determined, the instruction of the data transmission operation is dynamically adjusted and sent according to the state of the current bandwidth, the problems of network blockage and operation delay caused by a large amount of data transmission due to accumulation of the operation instruction are avoided, the data transmission speed is further improved, and the smoothness of image data transmission is improved.
Further, with reference to the foregoing flow, in order to enable the client to know the time required for receiving the specified image in the current network state, for this purpose, an embodiment of the present invention provides another implementation manner, as shown in fig. 2, before the client obtains the time length for receiving the specified image and the size of the specified image in step 101, the following steps are further performed, and specifically include:
104. and the client sends a request message for acquiring the specified image to the image server and records a first sending moment.
The request message may include, but is not limited to, the name, age, and time of examination of the patient. The examination part and other information, so that the image server can load the examination data of the patient according to the information, and further the image server obtains the specified image and sends the specified image to the client.
The first sending time is the current time corresponding to the time when the client sends the request message for acquiring the specified image to the image server.
105. And the client receives the appointed image sent by the image server and records first receiving time.
The first receiving time is the current time corresponding to the time when the client finishes receiving the specified image sent by the video server.
106. And the client determines the time length for receiving the appointed image by the client according to the first sending time and the first receiving time.
The time length for the client to receive the specified image is the difference between the first receiving time and the first sending time.
Further, a designated image is obtained by a rendering server in the data processing system after image rendering processing, and based on this, another implementation method is further provided in the embodiments of the present invention, as shown in fig. 3, before the receiving, by the client, the designated image sent by the image server and recording a first receiving time in step 105, the method further includes:
107. and the image server responds to the request message to acquire the appointed image identification.
Wherein the designated image identifies raw examination data indicative of the patient.
108. And the video server sends an image rendering request message to the rendering server and records second sending time.
Wherein the image rendering request message includes the specified image identifier.
109. And the rendering server acquires the specified image according to the specified image identifier.
And the rendering server loads the original inspection data corresponding to the specified image identifier according to the specified image identifier, and performs image rendering algorithm processing on the loaded original inspection data to generate a three-dimensional image, wherein the generated three-dimensional image is the specified image.
110. And the video server receives the specified image sent by the rendering server.
111. And the video server sends the specified image to the client and records a third sending moment.
And the third sending time is the current time corresponding to the time when the video server sends the specified image to the client.
Further, considering that a certain processing time is required when the rendering server performs image rendering to generate a three-dimensional image, so as to enable the duration obtained by the client to be more accurate, an embodiment of the present invention further provides another implementation manner, and as shown in fig. 4, the implementation, in step 106, of determining, according to the first sending time and the first receiving time, the duration for the client to receive the specified image specifically includes:
1061. and the video server determines the time length for acquiring the specified image according to the second sending time and the third sending time.
The duration of the appointed picture acquired by the image server is the difference value between the third sending time and the second sending time. The duration includes: the time when the imaging server sends the rendering request message to the rendering server, the time when the rendering server loads the original examination data of the patient and generates the three-dimensional image, and the time when the imaging server receives the three-dimensional image sent by the rendering server.
1062. And the client determines the time length for receiving the specified image by the client according to the first sending time, the first receiving time and the time length for obtaining the specified image by the image server.
Specifically, the following correspondence relationship exists between the time length of the client itself receiving the designated image and the first sending time, the first receiving time and the time length of the video server obtaining the designated image:
t＝rt1-st1-t0
wherein t is the time length for the client to receive the specified image; r ist1Is a first reception time; st1Is the first transmission time; t is t0And the video server acquires the duration of the specified image.
Further, with reference to the foregoing flow, in order to enable a time interval during which the client sends the data transmission operation instruction to match with an operation load that can be borne by the current bandwidth, an embodiment of the present invention further provides another implementation manner, as shown in fig. 5, after the client determines the current bandwidth according to a duration during which the client receives the specified image and a size of the specified image in step 102, the method further includes:
112. and the client determines the current image rendering frame rate according to the current bandwidth and the size of the specified image.
The image rendering frame rate refers to the number of images transmitted per second. The larger the image rendering frame rate, the more consistent the image is, however, the higher the image rendering frame rate, the higher the network bandwidth requirement between the client and the video server for transmitting the image data is.
Wherein the image rendering frame rate is the quotient of the current bandwidth and the size of the specified image, i.e. fps＝lan1M, wherein fpsRendering a frame rate for the image; lan1Is the current bandwidth; m is the size of the specified image.
According to the embodiment of the invention, the image rendering frame rate is dynamically adjusted in real time according to the current bandwidth of the communication network and the size of the three-dimensional image, so that when high-frequency operation (such as rotation, scaling and the like) on the three-dimensional image is realized in medical diagnosis, on the premise of ensuring the definition of the three-dimensional image and not influencing the analysis and diagnosis of a doctor on the three-dimensional image, some unnecessary intermediate operations experienced when the final high-frequency operation is finished are properly filtered out based on the load amount which can be operated by the current bandwidth, and thus, the transmission amount of image data is reduced, and the waiting time in image diagnosis is further reduced.
To facilitate understanding by those skilled in the art, specific examples are given:
in the three-dimensional image diagnosis, in the process of realizing the rotation of the three-dimensional image, if the client of a doctor detects that the current bandwidth of a network is good, the three-dimensional image is rotated at a rotation angular velocity of 5 degrees each time when the three-dimensional image is rotated; if the client of the doctor detects that the current bandwidth of the network intersects, when the three-dimensional image is rotated, the client of the doctor appropriately filters to a part of the middle operation in the rotation operation, so that the three-dimensional image is rotated at a rotation angular velocity of 10 degrees each time.
It should be noted that the above specific examples are only one application example, and are not intended to limit the present invention.
113. And the client determines a sending time interval corresponding to the current bandwidth according to the current image rendering frame rate.
Wherein, the corresponding relation between the sending time interval corresponding to the current bandwidth and the current image rendering frame rate is as follows: the sending time interval corresponding to the current bandwidth is the reciprocal of the current image rendering frame rate.
It should be noted that, the sending time interval corresponding to the current bandwidth is determined according to the current image rendering frame rate corresponding to the current bandwidth, so that the operation instruction for transmitting the image data is fully matched with the current bandwidth, thereby ensuring that the bandwidth for transmitting the data is always operated at full load, ensuring the fluency of image data transmission, and reducing the waiting time in the medical diagnosis process.
Based on the foregoing data transmission method, an embodiment of the present invention provides a data transmission apparatus, a schematic structural diagram of which is shown in fig. 6, the apparatus includes a client 21 and an image server 22,
the client 21 is configured to obtain a time length for receiving a specified image and a size of the specified image.
The client 21 is further configured to determine the current bandwidth according to the duration of receiving the designated image by the client and the size of the designated image.
The client 22 is further configured to send an operation instruction for data transmission to the image server 22 according to the sending time interval corresponding to the current bandwidth.
Optionally, the client 21 is further configured to send a request message for acquiring the specified image to the video server and record a first sending time.
The client 21 is further configured to receive the specified image sent by the video server and record a first receiving time.
The client 21 is further configured to determine, according to the first sending time and the first receiving time, a time length for the client to receive the specified image.
Optionally, as shown in fig. 7, the apparatus further includes a rendering server 23.
Optionally, the image server 22 is configured to obtain the specified image identifier in response to the request message.
The image server 22 is further configured to send an image rendering request message to the rendering server, where the image rendering request message includes the specified image identifier, and record a second sending time.
The rendering server 23 is further configured to obtain the specified image according to the specified image identifier.
The image server 22 is further configured to receive the designated image sent by the rendering server.
The video server 22 is further configured to send the specified image to the client and record a third sending time.
Optionally, the image server 22 is further configured to determine a duration of obtaining the specified image according to the second sending time and the third sending time.
The client 21 is further configured to determine, according to the first sending time, the first receiving time, and a time length at which the imaging server obtains the specified image, a time length at which the client itself receives the specified image.
Optionally, the client 21 is further configured to determine a current image rendering frame rate according to the current bandwidth and the size of the specified image.
The client 21 is further configured to determine a sending time interval corresponding to the current bandwidth according to the current image rendering frame rate.
The embodiment of the invention provides a data transmission device, wherein a client in a data transmission system determines the current bandwidth by acquiring the time length of receiving a specified image and the size of the specified image, so that the sending time interval corresponding to the current bandwidth is determined according to the current bandwidth, and the operating instruction of data transmission is sent to an image server according to the sending time interval corresponding to the current bandwidth. Compared with the prior art, the embodiment of the invention dynamically adjusts and sends the instruction of the data transmission operation according to the state of the current bandwidth by determining the current network bandwidth, thereby avoiding the problems of network blockage and operation delay caused by a large amount of data transmission due to accumulation of the operation instruction, further improving the speed of data transmission and improving the fluency of image data transmission.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions in actual implementation, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a Processor (Processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A data transmission method is applied to a data processing system, the data processing system comprises a client and an image server, and the method comprises the following steps:
the client acquires the time length of receiving a specified image and the size of the specified image;
the client determines the current bandwidth according to the duration of receiving the designated image by the client and the size of the designated image;
the client sends an operation instruction of data transmission to the image server according to the sending time interval corresponding to the current bandwidth;
after the client determines the current bandwidth according to the duration of receiving the designated image and the size of the designated image, the method comprises the following steps:
the client determines a current image rendering frame rate according to the current bandwidth and the size of the specified image;
and the client determines a sending time interval corresponding to the current bandwidth according to the current image rendering frame rate.
2. The method according to claim 1, wherein before the client acquires the time length of receiving the specified image and the size of the specified image, the method comprises:
the client sends a request message for acquiring the specified image to the image server and records a first sending moment;
the client receives the appointed image sent by the image server and records first receiving time;
and the client determines the time length for the client to acquire the specified image according to the first sending time and the first receiving time.
3. The method of claim 2, wherein the data processing system further comprises a rendering server.
4. The method of claim 3, wherein before the client receives the specified image sent by the video server and records a first receiving time, the method comprises:
the image server responds to the request message to acquire a designated image identifier;
the video server sends an image rendering request message to a rendering server and records second sending time, wherein the image rendering request message comprises the specified image identifier;
the rendering server acquires the specified image according to the specified image identifier;
the video server receives the designated image sent by the rendering server;
and the video server sends the specified image to the client and records a third sending moment.
5. The method according to claim 4, wherein the determining, according to the first sending time and the first receiving time, a time length for which the client itself receives the specified image comprises:
the image server determines the duration of acquiring the designated image according to the second sending time and the third sending time;
and the client determines the time length of the client for receiving the specified image according to the first sending time, the first receiving time and the time length of the specified image acquired by the video server.
6. A data transmission device is characterized by comprising a client and an image server:
the client is used for acquiring the time length for receiving the appointed image and the size of the appointed image;
the client is further used for determining the current bandwidth according to the duration of receiving the designated image and the size of the designated image;
the client is further used for sending an operation instruction of data transmission to the image server according to the sending time interval corresponding to the current bandwidth;
the client is also used for determining the rendering frame rate of the current image according to the current bandwidth and the size of the specified image; the current image rendering frame rate determines a transmission time interval corresponding to the current bandwidth.
7. The apparatus of claim 6, further comprising:
the client is also used for sending a request message for acquiring the specified image to the image server and recording a first sending moment;
the client is also used for receiving the appointed image sent by the image server and recording first receiving time;
and the client is further used for determining the time length of the client for receiving the specified image according to the first sending time and the first receiving time.
8. The apparatus of claim 7, further comprising a rendering server.
9. The apparatus of claim 8, wherein the apparatus comprises:
the image server is used for responding to the request message and acquiring a designated image identifier;
the video server is further configured to send an image rendering request message to the rendering server and record second sending time, where the image rendering request message includes the specified image identifier;
the rendering server is further used for acquiring the specified image according to the specified image identifier;
the video server is further used for receiving the designated image sent by the rendering server;
and the video server is also used for sending the specified image to the client and recording a third sending moment.
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