JPS63191437A - Image transmission system - Google Patents

Abstract

PURPOSE:To utilize a network efficiently even when the transfer speed between a terminal and NIU is slow by storing control data and image data in a buffer memory, and setting up a line for transferring the image data when the amount of data which are sent at a time is exceeded. CONSTITUTION:A request (CONN REQ) for line connection between terminals A and B is made in a period (a)-(b), then a request to send (SEND REQ) is sent at a point to the buffer memory 8M of a C-network controller 8 and the buffer memory 9M of an I-network controller 9. The control data and image data begin to be stored. The control data is outputted to the network 1 first from the C-network controller 8 through an optical multiplexer demultiplexer 10. Then the image data is sent from the I-network controller 9 to the network 1 through the optical multiplexer demultiplexer 10. Then the image data is sent to the opposite terminal B through a network interface unit (NIU) B.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an image transmission method for transmitting images with large information capacity such as medical images.

(Prior Art) Network systems for transmitting images with large information capacity, such as X-ray images, are known.

In this network system, multiple terminals (image devices;
p...ent, IE) is connected, and each terminal is connected to a network interface unit (Network In).
It is connected to the network via a terf'ace unit (NIU). When transmitting image data between arbitrary terminals, control data is generated before and after image data is generated from a certain terminal, and the NIU identifies whether the series of data input from the terminal is control data or image data, It requests line establishment by transmitting control data through its internal control network. When a line is established as a result, the NIU transmits image data through its internal image network, thereby allowing image data to be transmitted between arbitrary terminals via the network. When the image data transmission is completed, the NI
By transmitting the control data again via U, one execution unit leading to the image transmission is completed.

(Problems to be Solved by the Invention) However, in such a conventional image transmission method, not only the line establishment period necessary for transmitting image data, but also the control data transmission period before and after this, and the image data transmission from the terminal The line, that is, the network, is occupied over the period of time during which the data is transferred. This will prevent image data transmission from other terminals.
There is a problem that the network usage rate decreases and is uneconomical.

The present invention has been made in response to such problems, and it is an object of the present invention to provide an image transmission method that can efficiently utilize a network.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention stores control data and image data to be transmitted in a buffer memory in advance, and controls when the capacity of the buffer memory is exceeded. It is characterized by transmitting data and image data to a network.

(Operation) Only when the capacity to be transmitted at one time is reached, a line is established and image data is transmitted to the network. When the transmission of image data is completed, the network is occupied. Therefore, it is possible to prevent the network from being unnecessarily occupied by control data.

(Embodiment) Fig. 1 is a block diagram showing an embodiment of the image transmission system of the present invention, in which a plurality of terminals 2 (IE) are connected via a network 1 (including star couplers S and C in the figure). has been done. Further, each terminal 2 is connected to a network interface unit (NftJ) 3. NlU3 and couplers S and C are connected by, for example, an optical fiber 11. A plurality of NlUs 3 and terminals 2 are connected to the star couplers S and C, that is, the network 1, but for convenience of explanation, only one of each is shown as an example in the figure.

NftJ3 is IE interface 6, CPU 7°C
-Net controller 8. It is composed of an I-net controller 9 and an optical multiplexer/demultiplexer 10.

The C-net controller 8 performs control operations on control data among the data sent from the terminal, and has a buffer memory 8M therein for storing the control data. (2)-The net controller 9 performs a control operation on image data among the data sent from the terminal, and is provided with a buffer memory 9M for storing the image data therein. When the control data and image data sent from the terminal 2 exceed the capacity of the buffer memories 8M and 9M, the buffer memories 8M and 9M are transferred to the network 1 by the optical multiplexer/demultiplexer 10.
transmitted to. The CPU 7 identifies whether the data sent from the terminal via the IE and I/F 6 is control data or image data, and inputs the control data to the C-net controller 8 and the image data to the ■-net controller 9.

The control data is used to communicate with the terminal via the other party's NIU in order to establish a line before and after transmitting image data.

Next, the operation of this embodiment will be explained.

Figure 2 shows a protocol showing the flow of data when transmitting data.
A case is shown in which image data is transmitted via a network between IUΔ and NIUB.

Request for line connection (CON) between terminals A and B during period a and b
After N REQ) is performed, the Baranoa memory 8M of C-net controller 8 and ■-net controller 9
A transmission request (SEN
The accumulation of control data and image data representing DREQ) is started.

A line is established by first outputting control data from the C-net controller 8 to the network 1 via the optical multiplexer/demultiplexer 10. Next ■-net controller 9
The image data is transmitted to the network 1 via the optical multiplexer/demultiplexer 10. This will result in NIUB against the other party.
Image data will be transmitted to terminal B via .

When the transmission of the image data ends at point d, the line is closed at this point d, and the right to use it is handed over.

Therefore, according to this embodiment, the period during which the network is occupied is only between C and 0, during which image data is transmitted. On the other hand, in the conventional d3, there are two points: immediately after point a, where control data representing a line connection request is output from the C-net controller 8, to point 0, where image data transmission starts, and immediately after image data transfer. Line release from point d (DISCONN)
control data representing REQ> is output (input) f
The period up to this point was a period in which the network was unnecessarily occupied by control data. As a result, according to the present invention, it is only necessary to occupy the network for the period necessary for transmitting image data, so that unnecessary periods can be saved for other terminals, thereby reducing the network utilization rate. can be improved. Therefore, it can be used economically. ■-Buffer memories 8M and 9M provided in the net] roller 8 and the C-net controller 9, respectively.
The capacity can be arbitrarily selected depending on the purpose and use.

In the embodiment, an example is shown in which image data is transmitted from terminal A to terminal A, but conversely, the same can be done even when transmitting from terminal B to terminal A. The same applies when transmitting data between arbitrary locations.

[Effects of the Invention] As described above, according to the present invention, control data and image data are stored in a buffer memory, and a line is established to transfer the image data when the capacity to be transferred at one time is exceeded. This allows the screw 1 to the workpiece to be used efficiently even when the transfer speed between the terminal and the NIU is slow.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the image transmission method of the present invention, and Fig. 2 is a block diagram showing an embodiment of the image transmission method of the present invention.
”. 1...Network, 2...Terminal, 3...NIU (Network Interface Unit l~), 8...
・C-Net Controller, 9...■-Net] ~Con1~Roller, 8M, 9M...
・Buffer memory. Agent Patent Attorney Masayoshi Misawa = 9-

Claims (1)

[Claims] The plurality of network interfaces that transfer image data are connected by at least a double network,
The interface is provided with a buffer memory, at least a part of the image data to be transmitted is stored in the buffer memory in advance, and after the storage is stored, the control data is transferred to the other interface, and a network line connection is established for transmitting the image data. An image transmission system characterized in that each of the interfaces is provided with a control unit that performs the control.