JP2004015600A - System for storing/distributing image and method for controlling server device of the system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image storage/distribution system using an image server that stores image data (motion JPEG, etc.) with visibility in one frame unit, which is transmitted from a camera device provided with a communication function connected to a network and then distributes the image data to a user device at a fixed reproducing speed without depending on a network transmission speed. <P>SOLUTION: An image server 201 receives the image data with visibility in frame units from a camera 101 and stores the image data in a storing part 202 while a time relation specifying means 203 keeps a received time relation. When the image data is requested from terminal devices 211 and 213, a transmission synchronizing means 204 reproduces the same time interval as that of recording the image data, and the image data is transmitted from the image server 201 to each of the user terminal devices. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image storage and image distribution system for storing image data captured by an image acquisition device such as a camera in a server via a network, and distributing the image data to a client terminal at a remote location via the network, The present invention relates to a method for controlling a server device used.
[0002]
[Prior art]
FIG. 5 shows an example of an image distribution system for distributing a moving image via a communication network such as the Internet. Referring to FIG. 5, reference numeral 501 denotes a camera having a function of capturing an image to generate image data and communicating with a server via a network; and 502, a function of transmitting and delivering image data obtained from the communication line 504 to the communication line 505. A server 503 is a client terminal that displays image data.
In this system, a camera 501 spontaneously sends image data to a server 502. The server 502 sends this to the client terminal 503. As a result, the image of the camera 501 is displayed on the client terminal 503.
In particular, in the case where the transmission speed between the server 502 and the client terminal 503 in FIG. 5 is low, the time when an image is distributed from the server 502 to the client terminal 503 and the reception of data from the client terminal 503 are confirmed based on the image. Japanese Patent Application Laid-Open No. H10-42185 has already disclosed a moving image distribution technique for performing thinning-out processing of an image by estimating the degree of network congestion using the time until a signal is returned to the server.
[0005]
[Problems to be solved by the invention]
However, in the above-mentioned technology, although a method of distributing an image captured by a camera to a client terminal in real time is described, after storing a moving image transmitted from a camera in a server, the stored image is stored in real time. There is no mention of synchronizing video distribution to client terminals.
In other words, when the transmission speed of the communication line 504 is lower than that of the communication line 505, image data for 10 seconds sent from the camera 501 to the server 502, for example, requiring 10 seconds, is transmitted from the server 502 to the client terminal 503. The message is sent in less than 10 seconds, and as a result, there is a problem that the message is displayed on the client terminal 503 in less than 10 seconds. Similarly, when the communication speed is reversed, the image is displayed in a time longer than 10 seconds, and it is difficult to maintain the time relationship when the image is taken by the camera 501 after all.
Further, the conventional system does not describe a case where the transmission speed of the communication lines 504 and 505 is a non-constant best effort type. Even if the transmission speed of the communication line 505 is lower than that of the communication line 504 and the transmission speed is constant, if the transmission speed of the communication line 504 is not constant, the transmission speed of the image data sent from the camera 501 to the server 502 is reduced. Since it is not constant, the time interval between each frame in the moving image is not constant. For this reason, even if this is displayed on the client terminal 503, the moving image becomes a jerky moving image whose time interval is not constant. Conversely, even if the transmission speed of the communication line 504 is constant, if the transmission speed of the communication line 505 is not constant, the image will be similarly jerky.
In order to solve such a problem, according to the present invention, when the transmission speed of a communication network between a camera device and an image server and between an image server and a client terminal device is different, and whether the transmission speed of each communication network is constant. It is an object of the present invention to provide an image storage / distribution system capable of distributing image data to a client terminal while maintaining a time relationship transferred from a camera to an image server regardless of whether or not the image data is transferred.
Also, an image storage / distribution system is provided which can distribute image data to a client terminal while maintaining the time relationship between the image data captured by the camera and stored in the image server while transferring the image data from the camera to the image server. The purpose is to:
[0010]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, there is provided an image transmitting apparatus for transmitting continuous image data having visibility in frame units to a network, and a storage device for receiving and storing the image data via the network. Image storage / distribution system comprising a server device provided with a terminal device having a means for requesting the server device to transmit the image data via a network and receiving and displaying the image data from the server device Wherein the server device includes a time relation specifying means for specifying a time relation between the respective frames with respect to the continuous image data, and a storage unit, and matches the time relation specifying information by the time relation specifying means with the image data. When the terminal device sends an image transmission request to the server device, the time relationship specifying information stored in the storage device is stored. It is characterized by having a sending synchronization means for adjusting the image data to be transmission time and transmission of the image data based on.
According to a second aspect of the present invention, in the image storage / distribution system according to the first aspect, the time relationship specifying means determines the mutual relationship between the respective frame image data based on the reception time of the continuous image data in each frame unit. It is characterized by specifying a time relationship.
According to a third aspect of the present invention, in the image storage / distribution system according to the first aspect, the server device uses the reception time of the continuous image data of each frame unit as time-related identification information as the time-related identification information. It is characterized in that it is applied to each file name.
According to a fourth aspect of the present invention, in the image storage / distribution system according to any one of the first to third aspects, the transmission synchronizing means receives the image data transmission request for the second and subsequent frames from the terminal device. In this case, the difference between the time at which the second and subsequent frame image data transmission requests are received and the time at which the first frame image data is transmitted and the time relationship specifying information stored in the storage unit determine the first frame image data. A difference between the time at which the frame image data was received and the time at which the frame image data received the transmission request and the time at which the image data continuous with the frame image data was received is calculated and compared, and the terminal device receives the time interval at which the server device received the time. The apparatus is characterized in that the image data to be sent out and the time to send out the image data are adjusted so that each image data is reproduced by the device.
According to a fifth aspect of the present invention, there is provided an image transmitting device for photographing continuous image data having visibility in frame units and transmitting the image data to a network, and a storage device for receiving and storing the image data via the network. An image storage / distribution system comprising: a server device; and a terminal device having means for requesting the server device to transmit the image data via a network and receiving and displaying the image data from the server. A method of controlling a server device, wherein information identifying a time at which the image data is received in frame units from the image sending device via a network is stored in a storage unit in association with each image data, Setting a number that specifies the order in which the image server has received the series of image data; and setting the number to be assigned to the number. Comparing and storing temporarily read from the storage unit based on a request signal of the frame from the end device, information identifying the time at which the image server receives the said sequence of the image data to each other,
Comparing the information specifying the time of reception of the request signal relating to the series of frame-based image data received from the terminal device with the transmission time of the image data initially transmitted to the terminal device upon receiving the request; The image server transmits the image data so that the image data is displayed on the terminal device at a time interval substantially equal to the time interval at which the image server receives the series of the image data based on the comparison data. Adjusting the image data using a number specifying the image data, and adjusting the time at which the image data is transmitted.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a diagram showing a configuration of an embodiment according to the present invention. In FIG. 1, reference numeral 101 denotes a camera as an image transmission device having a function of connecting a communication network and capable of capturing continuous image data having visibility in frame units; 104, a communication line connecting the camera to an image server; An image server including the means according to the present invention includes a storage device 202, a time relation specifying means 203, and a transmission synchronizing means 204 therein. Reference numeral 210 denotes a distribution communication line of the image server 201, and 211 denotes a low-speed communication terminal device, which is connected to a relatively low-speed communication line 212 such as a public telephone line. Reference numeral 213 denotes a high-speed communication terminal device, which is connected to a relatively high-speed communication line 214 such as an ADSL (asymmetric digital subscriber line). Each of the communication lines 104, 212, and 214 is a best-effort communication line, and a constant transmission speed is not always guaranteed. 215 is an Internet network.
An operation in the case where moving image data is transmitted from the camera 101 to the image server 201 will be described with reference to FIG. The moving image data sent from the camera 101 is in a so-called motion JPEG format in which there is no inter-frame correlation and visibility is provided for each frame. When image data in the motion JPEG format is transmitted from the camera 101 to the image server 201, the time specifying unit 203 creates a file in frame units with the time when each frame image data constituting the moving image data is received as a file name. , In the storage device 202.
For example, the image frame data received at 9:10:10 on March 1, 2002 AD is given a file name of “200203010991010.jpg”, and the image frame data is stored in the storage device 202. Subsequently, if the received image frame data is 9:10:11 on March 1, 2002, the data is stored with a file name of “20020301091011.jpg”. Similarly, by storing the data of each successively transmitted frame using the reception time as a file name, the time at which the image server receives each image frame data constituting the moving image from the camera can be specified as reception time information. Become. In the illustrated range, six JPEG images from “200203010991010.jpg” to “200203010991017.jpg” are received. Here, since the communication line 104 is the best-effort type, the interval at which it is sent is not always constant, and therefore the file name indicating the time is not always at a constant time interval.
Next, an embodiment of the time specifying means will be described with reference to FIG. In the figure, reference numeral 221 denotes a time counting area; 222, an image data reception time storage area; and 223, a file name setting unit. In the respective drawings, the same parts as those in the previous drawings are denoted by the same reference numerals.
As an example, although not shown, the time specifying means can be realized as a semiconductor memory attached to or connected to the CPU of the image server. In the figure, a time keeping area 221, an image data reception time saving area 222 and a file name setting means 223 are provided inside the semiconductor memory.
The time clock area 221 is a data area for clocking the current time at all times. The time information may be obtained from a clock device capable of outputting standard time information of a region where the image server is operated, or the time information may be obtained from a clock calculation area in the basic software of the image server. Further, the time information may be written at the time of starting the image server, and thereafter, the elapsed time may be added and stored in the time counting area.
The image data reception time storage area 222 is for temporarily storing the time information obtained from the time measurement area when the image server obtains the timing information of receiving one frame of image data from the camera.
The file name setting means 223 refers to the time information stored in the image data reception time storage area and automatically sets a file name in the image data of the one frame. The image data in which the time information stored in the reception time storage area is set as a file name is transferred to and stored in the storage unit in the image server. At this time, each frame image data is set to a file name set by the camera or a temporary file name and stored in the storage unit, and then the file name is rewritten by referring to the time information stored in the reception time storage area. Is also good.
If it is necessary to further increase the frame image data per second depending on conditions such as the size, resolution, and transfer speed of the image data sent from the camera, the file name should be further finely divided into tenths of a second or Time information less than that may be set in the timekeeping area.
The storage unit 202 can be realized by a nonvolatile memory or a hard disk device.
In FIG. 1 described above, when six low-speed terminal devices 211 view six JPEG images in the image server as moving images, the first image data transmission request is sent to the image server 201. Similarly, when a moving image is viewed on the high-speed terminal device 213, a first image data transmission request is sent to the image server 201. A transmission request from each terminal is transmitted to the image server via each communication line or the Internet network.
Next, the sending synchronization means will be described. The transmission synchronizing means is configured to, when receiving an image data transmission request from the user terminal device, perform image processing to transmit the image data so that the terminal device reproduces each image data according to a time interval received by the server device by a predetermined arithmetic processing. To adjust the time at which the corresponding image data is transmitted.
Next, an embodiment of the transmission synchronization means will be described with reference to FIG. In FIG. 8A, reference numeral 230 denotes a transmission synchronization control means, 231 denotes a time counting area, 232 denotes an image pointer / counter area, 233 denotes a pointer saving area, 234 denotes an image data transmission request reception time area, and 235 denotes an image pointer. The image data reception time area, 236 is a temporary storage area, 237 is an operation processing area, 238 is a communication unit, 240 is a base point A, and 240 is a base point B. In this figure, the same parts as those in the previous drawings are denoted by the same reference numerals.
The transmission synchronization means 204 is roughly divided into a transmission synchronization control section 230 for controlling the entire transmission synchronization means, and a communication section 238 for performing data communication with each user terminal via a communication line or the like. As an example, although not shown, the transmission synchronization control unit 230 can be realized as a semiconductor memory attached to or connected to the CPU of the image server. In the figure, in the semiconductor memory, a time keeping area 231, an image pointer / counter area 232, a pointer saving area 233, an image data transmission request receiving time area 234, a receiving time area 235 for image data assigned to the image pointer, It has a storage area 236 and an arithmetic processing area 237.
The communication section 238 can be realized by various communication lines connected to each user terminal or the Internet network, and a communication card having an interface corresponding to control inside the server such as the transmission synchronization means 204 and the like.
The time counting area 231 is a data area for always counting the current time. The time information may be obtained from a clock device capable of outputting standard time information of a region where the image server is operated, or the time information may be obtained from a clock calculation area in the basic software of the image server. Further, the time information may be written at the time of starting the image server, and thereafter, the elapsed time may be added and stored in the time counting area.
The image pointer / counter area 232 is initialized when the image server receives a signal requesting transmission of image data from the terminal device, and sets, for example, 1 to manage image data corresponding to this number. The number is used as a number, and thereafter, the pointer is incremented by one and used to specify image data in frame units corresponding to the order of the pointer.
The pointer save area 233 is an area for temporarily storing an image pointer value for each time point in each control stage of the sending synchronization means. It is used to refer to or read the arrival time of a request signal from the server or the reception time of the image server, or to specify image data to be transmitted.
The image data transmission request reception time area 234 stores the time at which the image server has received a signal requesting transmission of the second and subsequent image data from the terminal device. However, the initialization is performed after the transmission of the image data assigned to the image pointer has been completed by a predetermined arithmetic processing, and the time when the image server next received a signal requesting the image data transmission from the terminal device is stored again.
The image data reception time area 235 assigned to the image pointer is an area for storing the time at which the image server receives the image data assigned to the image pointer stored in the pointer save area. However, the initialization is performed after the transmission of the image data assigned to the image pointer by the predetermined arithmetic processing is completed, the image pointer is advanced by one, and the reception time at which the image server receives the corresponding image data is stored again.
The temporary storage area 236 is an area for always storing at least basic time information used in the arithmetic processing until the transmission of a series of image data is completed. In the temporary storage area, the time when the first image data is transmitted to the terminal device is stored as a base point A240, and the time when the image server receives the first image data is stored as a base point B241.
The arithmetic processing area 237 stores the image data transmission request reception time area 234, the image data reception time area 235 assigned to the image pointer, and the time data stored in the base points A240 and B241 in the temporary storage area 236, respectively. The read operation is performed and a predetermined operation is performed, and image data transmission processing is performed based on the operation result.
The predetermined calculation of the calculation processing area means that after transmitting the first frame image data in response to a request from the terminal device, the transmission synchronizing means transmits a transmission request relating to the second and subsequent frame image data from the user terminal device. When the first frame image data transmission request is received and the difference between the time at which the first frame image data is transmitted and the time at which the first frame image data is transmitted, and the time relation specifying information stored in the storage unit, the first frame image data is transmitted. The difference between the time at which the frame image data was received and the time at which the frame image data received the transmission request and the time at which the image data continuous with the frame image data was received is compared and calculated by the terminal device according to the time interval received by the server device. Control is performed to adjust the image data to be transmitted so that each image data is reproduced and the time to transmit the corresponding image data.
FIG. 3B shows an image data table, which reads a series of image data requested to be transmitted from the image data stored in the storage unit of the server device, and corresponds to each image pointer for each frame. It is an arrangement. In the figure, a file name of each image data, a reception time of each image data read from the image file name, and an image data reception time of each image pointer are sequentially allocated from the image pointer 1 to each image pointer for each image pointer. And the time interval based on the difference from the time when the image data of one frame before is received. Such an image data table may be created in a temporary storage area or the like, and existing data may be arranged and processed.
Next, the control operation of the transmission synchronization means 204 in the image server 201 will be described with reference to FIG. FIG. 4 is a PAD diagram (ISO8631) illustrating the operation of the sending synchronization means 204.
First, the sending synchronization means 204 determines whether or not a request signal for requesting image transmission transmitted from the user terminal to the image server has been received. (Step 1 = S1, hereinafter step is abbreviated as S) When a request signal arrives, the process proceeds to (S3). If not received, the process proceeds to (S2).
(S2) is a loop waiting for a request, and returns to the process of (S1) again to make a similar determination. If no request signal is received, this loop is repeated.
When a request signal is received, an image pointer for specifying an image file to be transmitted is initialized, and image data corresponding to the first frame is read out of the storage unit 202 from a series of image data based on the request signal. , Image pointer numbers. (S3)
Next, the image data designated by the image pointer, that is, the image data corresponding to the first frame from the series of image data is transmitted to the user terminal. (S4)
Here, the processing time of the time when the first image is transmitted = S4 is stored as the base point A. (S5)
Further, the time when the image server, which is obtained from the file name of the first transmitted image, receives the file is stored as a base point B. (S6)
Next, the image pointer is advanced by one, and a setting is made so that the second frame image data is read out from the series of image data and assigned. (S7)
Next, the process proceeds from (S9) to (S20) where the processes from (S20) are repeated under predetermined conditions. Here, if the image pointer exists in (S16), the process proceeds to (S17) and returns to (S8). If the image pointer does not exist in (S16), in other words, if a series of image data based on the request from the terminal has been transmitted (S20), the process proceeds to (S20), and the process ends.
The processing from (S9) to (S20) will be described below.
Next, the terminal enters a state of waiting for the next image request from the terminal again (S9), and if the next request signal has not been received, the process proceeds to (S10).
(S10) is a loop waiting for a request, and returns to the process of (S9) again to make the same determination. If no request signal is received, this loop is repeated.
When the next request signal arrives (S9), the arrival time of the request signal is stored as data (not shown), and the frame image data assigned to the current image pointer (here, the second) is transmitted. Prepare for processing.
The elapsed time from the time at which the first image data was sent (base point A) to the time at which the next request was received, and the time from when the first image data was stored in the storage unit (base point B) to the current Then, the elapsed time until the time when the image data assigned to the image pointer is stored in the storage unit (here, the time when the second image data is stored in the storage unit) is compared. (S11)
If the terminal uses a low-speed communication line, the time when the image server receives the second request signal, the time when the first image data received from the camera and stored in the storage unit is received. It is assumed that the time difference between the reception time of the second image and the second image is exceeded. In the example shown in FIG. 1, the arrival time difference of the second sheet counted from the first sheet is 1 second, the arrival time difference of the third sheet counted from the first sheet is 3 seconds, and the arrival time difference of the first sheet is 4 seconds. It is assumed that the arrival time difference of the sheet is 5 seconds.
If the second request from the terminal is 4 seconds after the transmission of the first sheet, the "next request arrival time"-"base point A" in (S11) is 4 seconds, and Since the “reception time of the current (here, the second image pointer)” − “base point B” is 1 second, the two are compared and the “request time of next request” − “base point A” is large. Branching to 1 (S12).
In this case, since four seconds have already passed after the first frame has been sent, simply sending the second frame image data (one second later) from the image server to the terminal will cause the camera to record the data through the low-speed communication line. It will be played back at a timing that is delayed compared to the timing at which it was performed. Therefore, in order to reproduce the timing recorded from the camera on the user terminal side, a low-speed communication line is taken into consideration, and unnecessary images are thinned out and searched to send the latest image.
That is, the time of “the next request arrival time” − “base point A” is compared with the “reception time of the current (here, second image) image pointer” − “base point B”, and the next calculation is performed. If "requested arrival time"-"base point A" is large, the process proceeds to (S13), the current image pointer is advanced by one, and the operation of (S12) is performed again. (S13) is repeated until the inequality in (S12) is satisfied. In this case, since the request for the second image from the terminal is 4 seconds after the transmission of the first image, the arithmetic operation is performed while the image pointer is advanced by 1, and the image data received 4 seconds or more after the first image data is received. And advance the image pointer to 4.
Next, the image pointer is returned by one in order to find the latest image data not exceeding 4 seconds, and the image data is read. (S14) In the above example, the image pointer = 3 (third image data) corresponds to this.
Next, the image data at the time of (S14) and the image pointer = 3 are sent to the terminal. (S15)
Further, it is determined whether or not the image data is the last frame image data in the series of image data. (S16)
In (S16), for example, the image pointer is advanced by one, and it is determined whether or not the corresponding image file exists in the image data table or the storage unit as shown in FIG. 3B for a series of requested image data. judge. Alternatively, when the image file name = image reception time is relatively regularly arranged, it is assumed that there is a continuous image by performing an operation by referring to the time information from the file name of the image data stored in the storage unit. good.
If it is not the last frame image data, the image pointer is advanced by one (S17), and the next image request is waited for as described above. (S9) When the terminal is at a low speed, the latest image can always be transmitted based on the time at which the request signal is received from the user terminal.
Conversely, a case where the terminal uses a high-speed communication line will be described below. In this case, the second and subsequent image data transmission requests come at intervals shorter than the time intervals of the accumulated frame image data. Therefore, the processing up to (S10) is the same as the low-speed processing, but it is assumed that one second, which is the time interval until the second image, has not elapsed at the time when the second image request is received from the user terminal. Is done. Therefore, it is determined by the determination formula of (S11) and the process branches to (S18).
In (S18), a time waiting process is performed until a difference time of 1 second or more between the reception time of the first image and the reception time of the second image data received from the camera and stored in the storage unit has elapsed.
If the difference time is less than one second, the loop processing of (S19) is performed. In (S19), counting is performed until the set time interval elapses, and the process returns to (S18). For example, after counting several tens of milliseconds (S18), the processing is performed again, and the calculation is repeated until the difference time becomes 1 second or more.
After about one second has passed by the processing of (S18) and (S19), the second image data of the image pointer 2 which is the image pointer in (S7) is transmitted here. (S15)
Subsequent processing is the same as in the case of low speed, and a series of image data is automatically transmitted in response to a request from the terminal, and when transmission to the last image frame is completed, the processing is terminated via (S20).
According to the above processing, even when the terminal side is at high speed, it is possible to cope by performing the necessary time waiting processing. With these operations, it is possible to transmit the image from the server in the same time as the recording time in both cases where the image recording speed is low and high speed.
Further, even if the line speed is not constant on both the recording side and the distribution side, transmission can be performed in synchronization with the time on the recording side, and there is a possibility that the line speed changes during recording and transmission. Even for a certain best effort type, transmission corresponding to the best effort type can be performed.
Further, once a series of image data is stored in the image server of the present invention in frame units, the image can be reproduced at an appropriate timing corresponding to the speed at which the image was recorded in the user terminal.
In the above example, the time relation specifying means 203 is described as an example in which the time at the time of recording is used as the file name, but the present invention is not limited to this. For example, it is needless to say that the file name can be arbitrarily set and managed by a database correlated with the recording time, or a file for associating the file name with the recording time is separately provided.
Although motion JPEG has been described as an example of image data, the present invention can be applied to any image data that does not need to be compressed and has no frame correlation and is visible in frame units. Needless to say.
[0062]
【The invention's effect】
As described above, according to the present invention, regardless of whether the transmission speeds of the networks connecting the camera device and the image server and between the image server and the client terminal device are different or constant, the client terminal device It is possible to provide an image storage / distribution system capable of reproducing a moving image according to the timing of transfer from the camera to the image server.
In addition, an image storage / distribution system capable of distributing image data to a client terminal while maintaining the time relationship between the image data captured by the camera and stored in the image server and transferred from the camera to the image server is provided. it can.
[0064]
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a moving image distribution server system according to the present invention.
FIG. 2 is a block diagram showing an embodiment of a time specifying unit according to the present invention.
FIG. 3 is a block diagram showing an embodiment of a transmission synchronization unit according to the present invention.
FIG. 4 is a PAD diagram for explaining the control operation of the transmission synchronization means.
FIG. 5 is a configuration diagram of a conventional moving image distribution system.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 101 ... Camera, 104 ... Communication line, 201 ... Image server, 202 ... Storage part, 203 ... Time specifying means, 204 ... Transmission synchronization means, 210 ... Communication line, 211 ... Communication terminal (low speed type), 212 ... Communication line ( Low-speed type), 213 communication terminal (high-speed type), 214 communication line (high-speed type), 215 Internet network, 221 time clock area, 222 image data reception time area, 223 file name setting area, 230 Transmission synchronization control means, 231, time measurement area, 232, image pointer / counter area, 233, pointer save area, 234, image data transmission request reception time area, 235, image data reception time area assigned to the image pointer, 236 .. Temporary storage area, 237 arithmetic processing area, 238 communication section, 240 base point A, 240 base point B, 501 camera 02 ... image server, 503 ... client terminal, 504, 505 ... communication line

Claims (5)

An image transmission device that captures continuous image data having visibility in frame units and transmits the image data to a network; a server device including a storage device that receives and stores the image data via the network; An image storage and distribution system comprising a terminal device having a means for requesting transmission of the image data via the server and receiving and displaying the image data from the server device,
The server device includes a time relationship specifying unit and a storage unit that specify a time relationship between the respective frames with respect to the continuous image data, and stores the time relationship specifying information by the time relationship specifying unit together with the image data in the storage unit. Stored in
When there is an image transmission request from the terminal device to the server device, transmission synchronization means for adjusting the transmission time of the image data and the image data to be transmitted based on the time relationship specifying information stored in the storage unit. An image storage / distribution system characterized by comprising: 2. The image storage / distribution system according to claim 1, wherein said time relation specifying means specifies a time relation between the respective frame image data based on a reception time of the continuous image data in each frame unit. 2. The image storage / distribution system according to claim 1, wherein the server device applies the reception time of the continuous image data of each frame unit as time relation specifying information to each file name of the image data. 4. The image storage and distribution system according to claim 1, wherein:
When the terminal device requests image data transmission for the second and subsequent frames, the transmission synchronization means synchronizes each time when the second and subsequent frame image data transmission requests are received with the first frame image data. The difference between the sending times and
Based on the time relationship specifying information stored in the storage unit, the difference between the time at which the first frame image data was received and the time at which the transmission request received frame image data and the time at which the image data continuous with the frame image data were received was obtained. Perform a comparison operation,
An image storage / distribution system which adjusts the image data to be transmitted so that each of the image data is reproduced by the terminal device at a time interval received by the server device and the time at which the image data is transmitted. An image transmission device that captures continuous image data having visibility in frame units and transmits the image data to a network; a server device including a storage device that receives and stores the image data via the network; A method of controlling the image server device of an image storage / distribution system including a terminal device having a means for requesting transmission of the image data through the server and receiving and displaying the image data from the server,
Storing information specifying a time at which the image data of each frame received from the image transmission device via a network is received in a storage unit in association with each image data;
Setting a number that specifies the order in which the image server received the series of image data;
Reading from the storage unit and temporarily storing based on a request signal in frame units from the terminal device so as to be assigned to the number,
Comparing each other with information specifying the time received by the image server for each of the series of image data,
Comparing the information specifying the time of reception of the request signal relating to the series of frame-based image data received from the terminal device with the transmission time of the image data initially transmitted to the terminal device upon receiving the request; When,
The image data transmitted by the image server so that the image data is displayed on the terminal device at a time interval substantially equal to the time interval at which the image server receives the series of image data based on the comparison data. And adjusting the time at which the image data is transmitted together with a number that specifies the image data.

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