JPH0723353A - Moving image network system - Google Patents

Abstract

PURPOSE:To obtain a moving image network system having high responseness to a moving image transmission request and capable of preventing a moving image signal from being interrupted. CONSTITUTION:A control part 20 adds information relating to the transmission terminal address, priority order and encoding kinds of moving image data transmitted from a terminal 1 to a terminal 2 to transmission load information received by a transmission load information receiving part 17 and outputs the added information to a transmission load information transmitting part 16. The transmission load information indicates the transmission terminal addresses, priority order and encoding kinds of moving image data transmitted from all terminals. The moving image data are encoded/decoded in accordance with the transmission load information of the moving image data to adjust transmission data volume corresponding to the transmission load of a transmission line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a video camera, a VTR.
The present invention relates to a moving image network system including a plurality of terminals to which moving image signal sources such as the above and moving image output devices such as a monitor TV and a printer are connected.

[0002]

2. Description of the Related Art Conventionally, as a moving image network system, for example, an optical ring network having a configuration shown in FIG. 14 is a video camera 65 which is a moving image signal source.
It has a display 66, which is a moving image output device, and a terminal 67 to which a video camera and a display are connected. This terminal 67 encodes a moving image signal from the video camera into a desired digital signal, which is then network interface 68. And a function of decoding the digital signal input from the network interface 68 and inputting it to the moving image output device.

Further, the network interface 68
Has the function of inspecting the slot circulating on the optical ring network shown in the figure and inserting the digital signal output from the terminal to the empty channel, and the function of reading the digital signal from the channel addressed to the own terminal. is doing. The optical fiber 69 is used as a transmission path of an optical signal transmitted on the optical ring network.

[0004]

However, in the above-mentioned conventional optical ring network, all channels are in use because one channel on the slot is exclusively assigned to the transmission of one moving image signal. In this case, a newly generated moving image signal transmission request is kept waiting until the use of one of the channels is completed, and there is a problem that the response to the transmission request is poor.

In order to solve the above problem, there is also a method in which the right to use channels is sequentially changed in predetermined time units to realize transmission of moving image signals more than the number of channels. There is a problem that the moving image signal is cut off every time the user's right to use is lost. Further, in the conventional optical ring network described above, since the transmission capacity per channel is fixed, the transmission capacity is reduced when the amount of data to be transmitted is small, such as when a moving image to be transmitted is a low resolution image. There is a problem that a part of the network is wasted and the utilization efficiency of the transmission line as a whole network deteriorates.

An object of the present invention is to provide a moving picture network system which has a high responsiveness to a moving picture transmission request and which does not break the moving picture signal.

[0007]

In order to achieve the above object, the invention according to claim 1 connects a plurality of terminals to each other via a transmission line and inserts moving image data into a plurality of slots. A moving image network system for transmitting and receiving the moving image data between the terminals, and means for generating transmission load information regarding transmission of moving image data on the transmission path; and means for transmitting and receiving the transmission load information. An encoding unit that encodes the moving image data based on a predetermined encoding conversion formula according to the transmission load information; and the moving image based on a predetermined decoding conversion formula according to the transmission load information. And decoding means for decoding the image data.

According to a seventh aspect of the present invention, there is provided a moving image network system in which a plurality of terminals are connected to each other via a transmission line and moving image data is transmitted and received between the terminals. Storage means for storing data, means for generating management information of the moving image data, means for transmitting and receiving the management information, and the moving image data based on a predetermined encoding conversion formula according to the management information. And a decoding unit that decodes the moving image data based on a predetermined decoding conversion formula according to the management information.

[0009]

In the above structure, the moving image data functions to be relayed or abandoned according to the load on the transmission path.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. [First Embodiment] FIG. 1 is a block diagram showing a configuration of a moving image network system according to a first embodiment of the present invention. As shown in the figure, the moving image network system includes five terminals (terminal I). (Reference numeral 1), II (2), III
(3), IV (4), V (5)). Further, since the respective terminals I 1, II, III, IV, and V have the same internal configuration, only the internal configuration of the terminal I 1 is shown in FIG. Reference numerals 6 to 15 are coaxial cables that are transmission lines that connect the terminals.

Reference numeral 16 is a transmission load information transmission unit for transmitting to the terminal V information regarding the transmission load for transmitting moving image data from the terminal I to the terminal II. Reference numeral 17 is a transmission load information receiving unit for receiving the transmission load information transmitted from the terminal II. A moving image data receiving unit 18 receives the moving image data transmitted via the coaxial cable 15.

Reference numeral 19 denotes a moving image data transmitting section, which divides the frame period of the video signal into eight slots, as shown in FIG. 7, and the moving image data in which header information described later is added to these slots. , And send it to the coaxial cable 11. Further, reference numeral 20 is a control unit, which checks the receiving terminal address, the priority order, the coding type, etc. indicated by the header information added to the beginning of the moving image data output from the moving image data receiving unit 18, and determines the receiving terminal. If the address matches the own terminal number, the decryption unit 21
Control is performed so that the moving image data from the moving image data receiving unit 18 is input.

On the other hand, if the receiving terminal address does not match the own terminal address, the priority order of the moving picture data is compared with the priority order of the moving picture signal output from the encoding unit 22, and the signal with the higher priority order is compared. Video data transmission unit 1
Output to 9. Further, the moving image data amount generated in the encoding unit 22 is controlled according to the information from the transmission load information receiving unit 17.

At the same time, the control unit 20 controls the terminal 1 to the terminal 2
The transmission terminal information, the priority order, and the coding type of the moving image data being transmitted to the transmission load information are added to the transmission load information received by the transmission load information receiving unit 17 and output to the transmission load information transmitting unit 16. In this transmission load information, the source terminal address, priority order, and coding type of the moving image data transmitted by each terminal are shown for all terminals. Further, reference numeral 21 is a decoding unit, which has a function of decoding the moving image data sent to its own terminal and outputting it as a predetermined analog video signal. Note that FIG. 3 shows the internal configuration of the decoding unit 21.

Reference numeral 23 is a display that functions as a moving image output device, and displays an analog video signal output from the decoding unit 21. Reference numeral 22 denotes an encoding unit that converts an analog video signal output from a video camera 24, which is a moving image information source, into four partial moving image data that are moving image data according to a predetermined conversion formula described later. After that, a predetermined header is added and output to the moving image data transmission unit 19 under the control of the control unit 20. Note that FIG. 2 shows the internal structure of the encoding unit 22.

FIG. 2 is a detailed block diagram of the encoding unit 22 which constitutes the moving picture network system according to the present embodiment shown in FIG. In the figure, reference numeral 29 is a system clock generator, which extracts a synchronizing signal from the moving image signal output from the video camera 24 shown in FIG. 1 and generates a sampling signal and various timing signals used in the terminal.
Further, reference numerals 25, 26, 27, 28 denote A / D converters A to
The A / D converter D is an A / D converter for the input moving image signal based on the sampling signal from the system clock generation unit 29.
Perform D conversion.

The internal connecting section 30 includes A / D converters A, B,
The outputs of C and D are encoded by encoders A, B, C and D (reference numerals 31 and 3).
2, 33, 34). These encoders A, B, C, D encode the outputs of the A / D converters A, B, C, D into four partial moving image data based on a predetermined conversion formula described later. . Reference numerals 36, 37, 38, 39
Is a dual port memory A, B, C, D, which writes the outputs from the encoders A, B, C, D to the write address output from the write counter 35. Further, reference numeral 35 is a writing counter, which corresponds to the sampling clock output from the system clock generating unit 29.
The write address is output to the dual port memories A, B, C and D.

Reference numeral 40 denotes a read counter, which is responsive to the transmission timing signal output from the system clock generation unit 29 to generate the dual report memories A, B, C ,.
The read address is output to D. Reference numeral 41 is a header addition unit, which is a dual port memory A, B,
The partial moving image signals read from C and D are added with header information such as a destination terminal address, a transmission terminal address, and a priority order.

FIG. 3 is a detailed block diagram of the decoding unit 21 which constitutes the moving picture network system according to this embodiment shown in FIG. In the figure, reference numeral 42 is a header removing unit for removing the header information added to the partial moving image signal. In addition, reference numerals 43, 44, 45 and 46 are
Dual report memories A, B, C and D for synchronously reproducing a plurality of partial moving image signals from which headers have been removed. The writing counter 47 stores the partial moving image signal from which the header has been removed, in the dual port memories A, B, C, and
It is a write counter that generates an address for writing to a predetermined address of D.

Reference numeral 49 is a dual report memory A,
This is a read counter that generates an address for reading the partial moving image signals written in B, C, and D based on the timing signal output from the system clock generation unit 54. Reference numeral 48 is a connection unit for connecting the output units of the dual port memories A, B, C, D and the input units of the decoders A, B, C, D. And reference numeral 5
Decoders A, B, C and D (codes 50, 51, 52 and 53) 0, 51, 52 and 53 decode the coded partial moving image signals based on a decoding formula described later. ).

Reference numeral 55 is a synthesizing unit, which includes decoders A, B,
Multiplex interleaved moving image signals output from C and D are combined into one moving image signal. Also, reference numeral 56
Is a D / A converter, which converts the output from the synthesizing unit 55 into a desired analog video signal and outputs it to the display. In this embodiment, as shown in FIG. 4, when a moving image signal is divided into pixel units each having four pixels a, b, c and d adjacent in the scanning line direction, a partial moving image signal is obtained. The following coding conversion formula is used for the division.

Therefore, the encoding conversion formula will be described in detail. Now, when the pixel unit has N ₀ pixels as a unit, a pixel set consisting of these N ₀ pixels is P ₀ ,
The average value of the image signal of each pixel belonging to the pixel set P ₀ is m ₀₁
Then, the pixel set P ₀ is divided into two pixel sets P ₁ and Q _1, and the average values of the image signals of the pixels belonging to P ₁ and Q ₁ are m ₁₁ and n ₁₁ , respectively.

Further, the pixel set P ₁ is converted into two pixel sets P _1.
21 and Q ₂₁ , and the pixel set Q ₁ is divided into two pixel sets P ₂₂ and Q _22, and the average value of the image signal of each pixel belonging to P ₂₁ and Q ₂₁ is m ₂₁ , n ₂₁ , and P ₂₁ , respectively. The average values of the image signals of the pixels belonging to ₂₂ and Q ₂₂ are m ₂₂ and n ₂₂ , respectively. Thereafter, similarly, the pixel set is continuously divided until the number of pixels belonging to the pixel sets P and Q becomes one, and the average value of the image signals of the pixels belonging to each pixel set is obtained, thereby obtaining N _{0 as} shown below. N ₀ k are obtained from the n average values m and the N ₀ −1 average values n. _{That, k 01 = m 01 k 11} = m 11 -m 01 k 21 = m 21 -m 11 k 22 = m 22 -n 11 k 31 = m 31 -m 21 k 32 = m 32 -n 21 k 33 = _{m 33 -m 22 k 34 = m} 34 -n 22:: the finding. Then, the coding conversion formula is as follows: k ₀₁ = 1/4 {a + b + c + d} for the encoder A (1) k ₁₁ = 1/2 {a + b} −1 for the encoder B / 4 {a + b + c + d} (2) For the encoder C, k ₁₂ = a−1 / 2 {a + b} (3) For the encoder D, k ₁₃ = c−1 / 2 { a + d} (4) Further, the decoding conversion formula is as follows: a = k ₀₁ + k ₁₁ + k ₂₁ (5) for the decoder A, b = k ₀₁ + k ₁₁ −k ₂₁ (6) for the decoder B For the device C, c = k ₀₁ −k ₁₁ + k ₂₂ (7), and for the decoder D, d = k ₀₁ −k ₁₁ −k ₂₂ (8).

The operation of the moving picture network system according to the embodiment of the present invention will be described below. In the moving image network system according to the present embodiment, the operation performed by each terminal is roughly classified into the following three, and each terminal performs the necessary operation among these three operations. These operations are: encoding: operation of dividing the moving image signal to be transmitted into a predetermined number of partial moving image signal parts according to the number of empty slots by referring to the transmission load information, and encoding. The partial moving image data signal received from the transmission line and the partial moving image data generated from the own terminal are transmitted on the transmission line in a predetermined procedure by referring to the transmission load information, and the moving image data transmitted by the own terminal. Operation of transmitting information regarding decoding Decoding: This is the operation of decoding the partial moving image signal sent to its own terminal.

These operations will be described in detail below. [Description of Encoding Operation] When the control unit 20 refers to the transmission load information and confirms that the transmission slots of all the terminals to be relayed have four or more free spaces on the way to the destination terminal, The encoding unit 22 is instructed to perform encoding using 4 slots. After that, when the moving image signal from the video camera 24 is input to the encoding unit 22, the system clock generating unit 29 of the encoding unit 22 separates the horizontal and vertical synchronization signals from the moving image signal.

FIG. 5 shows 4 times the period 4T, which is four times the pixel period of the input moving image signal, for use in the A / D converters A, B, C, D (reference numerals 25, 26, 27, 28). The heavily interleaved sampling signals φ ₁ , φ ₂ , φ ₃ , and φ ₄ are shown. Here, the moving image input from the video camera 24 is sampled by the pixel series a, b, c, and d, and A / D
A / D conversion is performed by the converters A, B, C and D. And
After the outputs of the A / D converters A, B, C, and D are latched so that they are simultaneously output at the clock φ ₀ , the internal connection unit 30
Via encoders A, B, C, D (reference numerals 31, 32,
33, 34).

The encoder A31 is an A / D converter which is an image signal of the pixel series a, b, c, d, based on the above equation (1).
The outputs of the converters A, B, C and D are averaged every 4T cycle and output to the dual port memory A36. In addition, the encoder B32 calculates A based on the above equation (2).
The average value of the A / D converters A and B, and the A / D converters A and B,
The difference between the average values of C and D is calculated for each cycle 4T and is output to the dual port memory B37.

In the encoder C, the difference between the output of the A / D converter A and the average of the outputs of the A / D converters A and B is calculated for each cycle 4T based on the above equation (3). , And outputs it to the dual port memory C38. And the encoder D3
4 is the dual port based on the above equation (4), which determines the difference between the output of the A / D converter C and the average of the outputs of the A / D converters C and D for each cycle 4T. Output to the memory D39.

In the dual port memories A, B, C and D, partial moving image signals k ₀₁ , k ₁₁ , k ₂₁ and k _{22 which} are outputs from the encoders A, B, C and D are every cycle 4T. And are written in a predetermined position according to the write address output from the write counter 35.
On the other hand, the read counter 40 generates read addresses at a predetermined transmission timing and outputs them to the dual port memories A, B, C and D. The read counter 40 sequentially outputs read addresses to the dual port memories A, B, C, D according to an instruction from the control unit 20. Here, the dual port memory A is read first. That is, in the dual port memory A, the partial moving image signal is sequentially read out as a serial signal according to the read address, and is output to the header adding section 41.

The header adding section 41 adds header information to the output from the dual port memory A with the receiving terminal address, the source terminal address of the sender, the coding type A, and the priority of 1 It is output to the moving image data transmission unit 19. Similarly, for the output from the dual port memory B, the encoding type B and the priority are 2
Other information is output as the same as the output from the dual port memory A, and is output to the moving image data transmission unit 19.

Further, with respect to the output from the dual port memory C, the header information is added with the encoding type C and the priority being 3, and the header information is output to the moving image data transmitting section 19.
Also, for the output from the dual port memory D,
It is output to the moving image data transmission unit 19 with the encoding type D and the priority of 4. When the instruction of the number of used slots from the control unit 20 is 3, the encoder D stops its operation and the outputs from the dual port memories A, B and C are sent to the moving image data transmission unit 19. When the instruction of the number of used slots is 2, the encoders C and D are stopped and the outputs from the dual port memories A and B are sent to the moving image data transmitter 19.
If the number of used slots is 1, the encoder B,
C and D stop, and only the output from the dual port memory A is sent to the moving image data transmission unit 19. [Description of Transmission Operation] When there is no moving image data to be transmitted from the terminal itself, the header unit added to the beginning of the moving image data output from the moving image data receiving unit 18 is the control unit 20.
When the receiving terminal address matches the address of the self terminal as a result, the output from the moving image data receiving section 18 is sent to the decoding section 21. However, when the receiving terminal address does not match the own terminal address, the output from the moving image data receiving unit 18 is the moving image data transmitting unit 19
, Which is inserted into a predetermined slot and transmitted.

Further, every time the control unit 20 transmits a slot in which moving image data is inserted, the source terminal address and the receiving terminal address of the moving image data, the coding type, and the priority order are used as the transmission load information of the own terminal. Record. If there is no moving image data to be transmitted and an empty slot is transmitted, it is recorded as an empty slot. When the control unit 20 newly receives the transmission load information from the transmission load information receiving unit 17, the control unit 20 retrieves the transmission load information of the own terminal recorded as described above, and only the frame time period of the video signal from the current time. The transmission load information of the moving image transmitted within the reverse time is updated as the transmission load information of the own terminal including the empty slot in the own terminal column of the transmission load information received from the transmission load information receiving unit 17, and the updated information is updated. It is transmitted from the transmission load information transmitter 16.

When the moving image data is transmitted from the terminal itself, the control unit 20 inspects the transmission load information output from the transmission load information receiving unit 17. Then, if there are four or more empty slots in the transmission load information fields of all terminals existing between the own terminal and the receiving terminal, transmission is performed using four slots. Therefore, the control unit 20 instructs the encoding unit 22 to perform encoding using four slots. Similarly, when there are 3, 2, and 1 empty slots, the coding unit 22 is instructed to perform coding using 3, 2, and 1 slots, respectively.

On the other hand, when there is only one empty slot, the control unit 20 checks the transmission load information and finds that all terminals between the own terminal and the receiving terminal are transmitting with a priority of 2 or less. Check if there is more than one. If one or more slots are present, the coding unit 22 is instructed to perform coding using one slot. Also, if there is no such slot,
It waits for transmission until such a slot occurs or an empty slot occurs.

When the control unit 20 receives the instruction regarding the encoding as described above, the encoding unit 22 performs the encoding as described above and outputs the moving image data to the moving image data transmitting unit 19. Then, if there is an empty slot, the moving image data transmitting unit 19 will use the empty slot for the encoding unit 2
2. The moving image data output from 2 is inserted and transmitted. If there is no empty slot, the moving image data transmission unit 19
In response to an instruction from the control unit 20, abandoned the moving image data output from the moving image data receiving unit 18 with a priority of 2 or less, and abandoned the moving image data output from the encoding unit 22. Insert in the appropriate slot and transmit.

Since the transmission load information in the moving image data transmitting unit 19 is transmitted to each terminal as described above, the terminal that has transmitted the abandoned moving image data is between the own terminal and the receiving terminal of the transmission load information. By knowing that the description relating to the moving image data transmitted by the own terminal has disappeared from the information column of each terminal existing in, the abandonment of the moving image data is known. As a result, the terminal stops the operation of the encoder corresponding to the abandoned moving image data.

In this way, after the start of transmission of moving image data, the transmission load information is always inspected, and when the moving image data sent from its own terminal is abandoned, the operation of a predetermined encoder is stopped. . Further, when an empty slot occurs when there is a stopped encoder, the operation is sequentially started from the one with the highest priority, and more moving image data is transmitted. [Description of Decoding Operation] The partial moving image data signal input to the decoding unit 21 has its header section removed by the header removal section 42 shown in FIG. 3, and the encoding type recorded in the header section is A. In the case of, in dual port memory A43,
When the coding types are B, C, and D, dual port memories B, C, and D (reference numerals 44, 45, and 46), respectively.
Is written according to the write address output from the write counter 47.

The number of partial moving image data transmitted from the transmitting side terminal is controlled by the transmission load information of the terminal on the way to the receiving side terminal. Therefore, on the receiving side,
The operation of the decoding unit 21 changes depending on the number of moving image signals that have arrived. The control unit 20 counts the number of moving image data signals that have reached the decoding unit 21 for each frame period of the image output to the display 23. If the number is 4, the dual port memories A and B are used. , C, D are controlled so that the data can be read. The system clock generator 54 also outputs quadruple interleaved system signals φ ₁ , φ ₂ , φ ₃ , and φ ₄ .

The read counter 49 counts the system signals output from the system clock generator 54, and the dual port memories A, B, C, and
The read address is output to D to read the stored data. The outputs from the dual port memories A, B, C, D are output to the decoders A, B, C, D via the internal connection section 48.
Is output to.

In the decoder A, the output signals of the dual port memories A, B and C are added based on the above equation (5) to decode the moving image signal corresponding to the pixel series a in the cycle 4T. , And outputs it to the combining unit 55 at the timing of the system signal φ ₁ . Further, the decoder B uses the dual port memories A and B based on the above equation (6).
By subtracting the output of the dual port memory C from the sum of the outputs of, the image signal corresponding to the pixel series b is decoded in the cycle 4T, and the decoded image signal is output to the combining unit 55 at the timing of the system signal φ ₂ .

Similarly, the decoder C calculates from the sum of the outputs of the dual port memories A and D based on the above equation (7),
By subtracting the signal of the dual port memory B, the image signal corresponding to the pixel series C is decoded in a cycle of 4T and output to the combining unit 55 at the timing of the system signal φ ₃ . Further, the decoder D subtracts the outputs of the dual port memories B and D from the output of the dual port memory A on the basis of the above equation (8) to obtain the image signal corresponding to the pixel series d in the cycle 4T. The data is decoded and output to the synthesis unit 55 at the timing of the system signal φ ₄ .

The image signals corresponding to the pixel sequences a, b, c, d output from the decoders A, B, C, D are system signals φ ₁ , φ ₂ , φ ₃ , φ ₄ and are sent to the synthesizing unit 55. Synthesized,
After being restored to one moving image signal, it is converted into a predetermined analog video signal by the D / A converter 56 and output to the display 23. Next, when there are three partial moving image data signals A, B, and C that have reached the decoding unit 21, the control unit 2
When 0, the reading of the dual port memory D is prohibited, and the pseudo data is output so that the value of k ₂₂ in the above equations (7) and (8) becomes 0. The operation of the other parts is similar to the case where the number of partial moving image data signals that have reached the above is four, and as a result, in the decoders C and D, k ₂₂ is replaced with 0 and a moving image signal is output. It

If the partial moving image signals reaching the decoding unit 21 are A and B, the reading of the dual port memories C and D is prohibited, and the above equations (5),
Pseudo data is output so that k ₂₁ and k _{22 in} (6), (7), and (8) are zero. This allows the decoders A, B,
In C and D, processing is performed with k ₂₁ = k ₂₂ = 0, and a moving image signal is output.

On the other hand, when the partial moving image data signal reaching the decoding unit 21 is only A1, the reading of the dual port memories B, C and D is prohibited, and the values of k ₁₁ , k ₂₁ and k ₂₂ are 0. The pseudo data is output so that And
In the decoders A, B, C and D, processing is performed with k ₁₁ = k ₂₁ = k ₂₂ = 0, and a moving image signal is output. As described above, according to the present embodiment, the moving image data is encoded / decoded according to the transmission load information of the moving image data between the terminals connected to the moving image network system. , It is possible to adjust the amount of transmission data according to the transmission load of the transmission path between the terminals that have issued the transmission request of the moving image, reduce the occurrence of waiting state for the transmission request, and improve the responsiveness. it can.

The method of dividing the moving image signal into pixel units is not limited to the method shown in FIG. For example, in FIG.
The moving image signal may be divided into pixel units as shown in FIG. That is, only the value of k ₀₁ in the above equation (1) obtained by division into partial moving image signals shown in FIG. 6 is transmitted, and the decoding unit 21 performs known 0 interpolation, low-frequency cutoff processing, image By performing the re-sampling process or the like for reduction, it is possible to restore a good reduced moving image of 1/2 × 1/2 size. Further, when the receiving terminal does not need to output a full-size moving image, it is effective in reducing the processing load in relaying at each terminal and reducing the transmission wait.

In the first embodiment, the encoders C and D shown in FIG. 3 both correspond to the high frequency components of the image, and when the input moving image signal does not contain many high frequency components, the code By configuring so as to stop the transmission of the outputs of the C / D converters, it is possible to reduce the processing load at the time of relaying at each terminal and the transmission waiting time. <Modification> FIG. 9 is a block diagram showing the configuration of a moving picture network system according to a modification of the first embodiment. The figure shows a configuration in which moving image data and transmission load information are multiplexed and transmitted, and in this moving image network system, the components of the moving image network system according to the first embodiment are Since the same components are designated by the same reference numerals, their description is omitted here.

In FIG. 9, reference numeral 57 denotes a transmission unit I, which transmits moving image data transmitted in the order of terminals I → V → IV → III → II → I and transmission load information in the transmission unit II62. Further, reference numeral 58 is a receiving unit I for receiving moving image data and transmission load information transmitted in descending order. Code 5
Reference numeral 9 denotes a multiplexing unit I, which multiplexes moving image data and transmission load information transmitted in descending order as shown in FIG.

Reference numeral 60 is a separating unit I, and a receiving unit I 58
The moving image data and the transmission load information are separated from the data received in. Reference numeral 62 denotes a transmission unit II, which is a terminal I → II → III.
The moving image data transmitted in the order of → IV → V → I (ascending order) and the transmission load information in the transmission unit I 57 are transmitted. Further, reference numerals 61, 63, and 64 are receivers for ascending order, respectively.
II, demultiplexing section II, and multiplexing section II, and receiving section I5 for descending order
8 has the same function as the demultiplexing unit I60 and the multiplexing unit I59.

In this modification, each terminal selects the transmission route with the smallest transmission load by searching the transmission load information in the ascending order and the descending order at the start of the transmission of the moving image, and starts the transmission. When moving images are transmitted in ascending order, the transmission load information transmitted in descending order is input from the separation unit I60, the transmission load is searched, and the encoding unit 22 is controlled. When the moving images are transmitted in descending order, the transmission load information from the separation unit II 63 is searched and the encoding unit 22 is controlled.

In this modification, the terminal I and the terminal V are
Although a double ring type topology in which the terminals I and V are connected to each other, a dual bus type topology in which the terminals I and V are not connected may be configured. [Second Embodiment] FIG. 10 is a block diagram showing the arrangement of a moving picture network system according to the second embodiment of the present invention. As shown in the figure, the moving image network system, like the first embodiment, has five terminals (terminals I (reference numeral 101), II (102), III (103), IV (10).
4), V (105)). Also, each terminal
Since I 1, II, III, IV, and V have the same internal configuration, FIG. 10 shows only the internal configuration of the terminal I 1.

Reference numerals 106 to 110 are coaxial cables that function as transmission lines connecting the terminals.
Further, reference numeral 111 is a receiving unit for receiving data transmitted on the coaxial cable. Also, reference numeral 112
Is a transmission unit for transmitting data on the coaxial cable. Reference numeral 113 denotes a plurality of FIFOs (First FIFO) for temporarily storing, among the data from the coaxial cable, the data to be transferred to the own terminal and the data to be transmitted from the own terminal to other terminals by priority order. In First Out) A storage unit consisting of a memory. In addition, in FIG.
The internal structure of is shown.

Reference numeral 114 is a control unit, which is the receiving unit 111.
Check the receiving terminal number, priority, coding type, allowable delay time, etc. indicated by the header added to the beginning of the partial moving image data output from, and if the receiving terminal number matches its own terminal number, decode it. The unit 115 controls so that the partial moving image packet signal output from the receiving unit 111 is input.

On the other hand, when the receiving terminal number does not match the own terminal number, data is controlled to be written in a predetermined FIFO memory of the storage unit 113 according to the priority order information, and the partial moving image packet signal is stored in the management table. Write the priority and allowable delay time of. Further, the control unit 114
Searches the management table, reads out, from the partial moving image packet signals stored in the storage unit 113, those that have not passed the allowable delay time according to the priority order, and then reads them out.
Output to 2.

Reference numeral 115 is a decoding unit, which decodes a single or a plurality of partial moving image signals sent to its own terminal and outputs it as a predetermined analog video signal. In addition,
Since the internal structure of the decoding unit 115 is the same as that of the decoding unit according to the first embodiment shown in FIG. 3, its illustration and description are omitted here. Reference numeral 117 is a display that functions as a moving image output device, and displays an analog video signal output from the decoding unit 115. Further, reference numeral 116 is an encoding unit which converts an analog video signal output from the video camera 118, which is a moving image information source, into four partial moving image data according to the predetermined conversion formula shown in the first embodiment. After the conversion, a predetermined header is added, and the packet is further converted into a packet, and then the storage unit 11
Output to 3.

The internal structure of the encoding unit 116 is shown in FIG.
The same configuration as that of the encoding unit according to the first embodiment shown in FIG. Therefore, illustration and description thereof are omitted here.
In addition, in the present embodiment, the method of dividing the moving image signal into pixel units is also the same as in the first embodiment (see FIG. 4), and therefore its illustration is omitted. FIG. 11 is a detailed block configuration diagram of the storage unit 113 that constitutes the moving image network system according to the present embodiment. The storage unit 113 shown in the figure includes eight FIFOs (FIFO I to FIFO VII).
I), and only the internal structure of FIFO I is shown. Each FIFO has a dual port memory 120 capable of independently performing write and read operations,
A write counter 121 for generating a write address,
The read counter 122 generates a read address.

The operation of the moving picture network system according to the second embodiment of the present invention will be described below. The operation of each terminal in the moving image network system according to the present embodiment is roughly classified into the following three, and each terminal performs a necessary operation among these three operations. However, since those operations are basically the same as the operations according to the first embodiment, the operations unique to this embodiment will be mainly described here.

The operation of each terminal is as follows: Encoding: operation of decomposing a moving image signal to be transmitted into partial moving image signal parts and encoding. Relay: Generation of a partial moving image data signal received from a transmission line and its own terminal. Operation of transmitting partial moving image data on a transmission line in a predetermined procedure Decoding: This is an operation of decoding a partial moving image signal sent to its own terminal. Hereinafter, these operations will be described in detail. [Description of Encoding Operation] When a moving image signal from the video camera 118 is input to the encoding unit 116, the encoding unit 116
The system clock generator 29 of 1 separates the horizontal and vertical sync signals from the moving image signal. The sampling timing in the present embodiment is the same as the timing shown in FIG. 5 (the sampling signal φ interleaved four times with the period 4T which is four times the pixel period of the input moving image signal).
₁ , φ ₂ , φ ₃ , φ ₄ ), the moving image input from the video camera 118 is sampled by the pixel series a, b, c, d, and A / D converters A, B, C, D ( Reference numerals 25 and 2
6, 27, 28) performs A / D conversion. Then, after the outputs of the A / D converters A, B, C, and D are latched so that they are simultaneously output at the clock φ ₀ , the encoders A, B, C, and D are connected via the internal connection section 30. (Reference numerals 31, 32, 3
3, 34).

Since the operation of each encoder is the same as the operation of the encoder in the first embodiment, the description thereof will be omitted. The read counter 40 generates read addresses at a predetermined timing for transmission and outputs them to the dual port memories A, B, C and D. That is, in the dual port memory A, the partial moving image signal is sequentially read out as a serial signal according to the read address, and is output to the header adding section 41.

In the header adding section 41, for the output from the dual port memory A, the receiving terminal address, the address of the source terminal, the encoding type A, the priority of 1,
The transmission time as the encoding time and the allowable delay time is 4
The header information is added as ms and written in the FIFO V of the storage unit 113. Similarly, for the output from the dual port memory B, the encoding type B, the priority is set to 2, and the other information is the same as the output from the dual port memory A, and is output to the FIFO VI of the storage unit 113. To do.

Further, with respect to the output from the dual port memory C, the header information is added with the encoding type C and the priority being 3, and the header information is written in the FIFO VII of the storage unit 113. Further, with respect to the output from the dual port memory D, the coding type D and the priority order are set to 4 and are written in the FIFO VIII of the storage unit 113. In this way
The data written in the FIFO V to the FIFO VIII of the storage unit 113 is appropriately processed in the operation of the relay processing described later. [Description of Relay Operation] Partial moving image signal data transmitted from another terminal (for example, terminal V) is received by the receiving unit 111 of the terminal I via the transmission line 110, and the information of the header unit is received by the control unit 114. Is checked and the output destination is controlled. Then, when the receiving terminal address recorded in the header section matches the terminal address of the self terminal (here, terminal I), the output of the receiving section 111 is sent to the decoding section 115.
However, when the receiving terminal address does not match the self terminal address, the priority order information is checked, and when the priority order is 1, the priority order information is output to the dual port memory of FIFO I of the storage unit 113.

Similarly, if the priority is 2, the FIF
It is sent to the dual port memory of O II, and when the priority is 3, 4 to the dual port memory of FIFO III and IV, respectively. Then, the storage unit 113
The partial moving image signal to is sequentially written to a predetermined address according to the write address output from the write counter 121. At this time, the control unit 114 registers the write start address and the write end address, the transmission time loaded on the header unit, and the allowable delay time in the management table.

In this way, the partial transmission moving image signal received by the receiving unit 111 is stored in the storage unit 113 as FIFO I ...
The partial moving image signals to be transmitted from the own terminal are written to FIFO V to FIFO VIII, as described in the above-described encoding operation. The control unit 114 checks the presence or absence of an untransmitted partial moving image data signal in the FIFO by comparing the value of the read counter and the value of the write counter of each FIFO in the storage unit 113. Then, when the untransmitted partial moving image signal remains in the FIFO, the transmission time and the allowable delay time are checked from the management table, and when the value obtained by adding the allowable delay time to the transmission time is larger than the current time, it is The address to be read is output from the read counter 122 as valid data, the dual port memory 120 is sequentially read, and the transmission unit 11
Output to 2. The transmitter 112 converts the received data into a predetermined digital signal and transmits it to the transmission path 106.

On the other hand, when the value obtained by adding the permissible delay time to the transmission time is smaller than the current time, the value of the read counter is set as invalid data by setting the write start address of the subsequent partial moving image signal to invalidate. The partial moving image signal that becomes is discarded. In this way, when there is no untransmitted partial moving image data signal of FIFO I in which the partial moving image signal with the highest priority is stored, the control unit 114
As in the case of FIFO I, the untransmitted partial moving image data signal of FIFO II is transmitted. And this FIF
When a partial moving image signal is newly written in FIFO I during transmission of O II, the partial moving image data signal of FIFO I is transmitted after the transmission of the partial moving image signal being currently transmitted is completed.

In other words, here, the partial moving image signals having the higher priority are preferentially transmitted, while the partial moving image signals having the lower priority are transmitted. [Description of Decoding Operation] The partial moving image data signal input to the decoding unit 115 has the header portion removed by the header removal unit 42, and if the encoding type recorded in the header portion is A, the dual In the port memory A43, and when the coding types are B, C, and D, dual port memories B, C, and D (reference numerals 44, 45, and 46), respectively.
Is written according to the write address output from the write counter 47.

The partial moving image data signal transmitted from the transmission side terminal is transmitted while being relayed by the terminal on the way to the reception side terminal. When the transmission load at the terminal on the way is large and the transmission is in the waiting state for more than the allowable delay time, the partial moving image signal is abandoned as described above. Therefore, not all of the four partial moving image data signals transmitted from the transmission unit 112 reach the reception unit 111. That is, the operation of the decoding unit 115 changes depending on the number of partial moving image signals that have arrived.

Since the processing of the control unit 114 for the number of partial moving image signals in this embodiment is the same as the processing in the first embodiment, the description thereof will be omitted, but the decoding unit 115 will be described. If no partial moving image data signal arrives, the partial moving image signal reached in the previous process remains in the dual port memory.
Using that data, the moving image signal is reproduced and output as in the previous time.

As described above, according to this embodiment,
The moving picture data signal transmitted on the moving picture network system is transmitted so that the delay time is shortened according to the priority order, and the moving picture data which has passed the predetermined delay time is removed to effectively use the transmission band. As a result, it is possible to reduce the occurrence of a waiting state for a transmission request, improve the responsiveness, and prevent the occurrence of interruption of the moving image signal.

Also in this embodiment, the method of dividing a moving image signal into pixel units is not limited to the method shown in FIG. That is, also in this embodiment, the moving image signal according to the first embodiment as shown in FIG. 6 may be divided into pixel units. Also in this embodiment,
The encoders C and D according to the first embodiment shown in FIG.
Both correspond to the high frequency components of the image, and if the input moving image signal does not include many high frequency components, the encoders C and D are used.
It is also possible to reduce the processing load at the time of relaying at each terminal and to reduce the waiting time for transmission by configuring to stop the transmission of the output of 1.

The coding system is not limited to the above embodiment, and for example, a hierarchical coding system such as DCT hierarchical coding may be used. <Modification> FIG. 12 is a block diagram showing a modification of the coding unit constituting the moving picture network system according to the second embodiment. The coding unit shown in the figure adopts a subband coding method with a so-called filter configuration, and a code 156 is used.
Is an A / D converter for digitizing a moving image signal output from the video camera 118. Also, reference numeral 1
Reference numeral 57 is a horizontal low-pass filter that transmits only horizontal low-frequency components of the video image, and reference numeral 158 is a horizontal high-pass filter that transmits only horizontal high-frequency components of the video image.

Reference numeral 159 is a system clock generator, which extracts a synchronizing signal from the moving image signal output from the video camera 118 and generates a sampling signal and various timing signals used in the terminal. Also, reference numeral 16
Reference numerals 0 and 161 denote decimators A and B, which thin out pixels in half in the horizontal direction. Reference numerals 162 and 164 denote vertical low-pass filters A and B, which transmit only low-frequency components in the vertical direction of the video image, and reference numerals 163 and 165 denote vertical high-pass filters A and B, which are high-frequency components in the vertical direction of the video image. Only the component is transmitted.

Reference numerals 166 to 169 denote decimators C, D, and
E and F, pixels are thinned out in the vertical direction by 1/2, and reference numerals 170 to 173 are quantizers A, B, C, and D, and outputs from the decimators C, D, E, and F are predetermined. Compress to bit length. Reference numerals 174 to 177 are dual port memories A, B, C, and D, reference numeral 178 is a header addition unit, reference numeral 179 is a write counter, and reference numeral 18
0 is a read counter. The dual port memory and the various counters are the same as the dual port memory and the various counters (see FIG. 2) according to the second embodiment.

In the encoding unit according to this modification, when the moving image signal from the video camera 118 is input, the pixel period T
Create a sampling signal with a period equal to. That is,
The A / D converter 156 includes a system clock generator 159.
The moving image signal is A / D converted by the sampling clock output from the horizontal low pass filter 157.
To the horizontal high-pass filter 158.

As described above, the horizontal low-pass filter 157 removes the high-frequency component of the signal in the horizontal direction, and thereafter, the decimator A160 thins out pixels to 1/2 in the horizontal direction. Further, in the horizontal high pass filter 158,
The low frequency component in the horizontal direction is removed, and the decimator B161
Thus, the pixels are thinned out to 1/2 in the horizontal direction. The output of the decimator A160 is the vertical low-pass filter A162,
The high frequency component in the vertical direction is removed, and the decimator C166
The pixels in the vertical direction are thinned to 1/2. Then, the quantizer A170 compresses the data into a predetermined bit length. From the quantizer A170 to the dual port memory A1
A partial moving image signal A containing only low frequency components in both the horizontal and vertical directions is output to 74.

The output from the decimator A160 is also input to the vertical high pass filter A163 at the same time, where
The low frequency components in the vertical direction are removed. Then, the decimator D167 thins out pixels in the vertical direction to ½, and then the quantizer B171 compresses the pixels to a predetermined bit length. In this way, the signal from the quantizer B171 to the dual port memory B becomes the partial moving image signal B including the low frequency component in the horizontal direction and only the high frequency component in the vertical direction.

The vertical low-pass filter 164 removes the high-frequency component in the vertical direction from the moving picture signal output from the decimator B161 and includes the high-frequency component in the horizontal direction, and the decimator E168 thins it out to 1/2 in the vertical direction. .
Then, the quantizer C172 compresses to a predetermined bit length, and the partial moving image signal C including only the high frequency component in the horizontal direction and the low frequency component in the vertical direction is output to the dual port memory C176.

The output from the decimator B161 is further output to the vertical high-pass filter B165 to remove the low frequency component in the vertical direction, and then the decimator F169.
Pixels are thinned to 1/2 in the vertical direction. Then, it is compressed to a predetermined bit length by the quantizer D173 and is output to the dual port memory D177 as a partial moving image signal D containing only high frequency components in the horizontal and vertical directions.

Thus, the dual port memory A,
Four partial moving image signals A, B, output to B, C, D
Similar to the encoding unit in the second embodiment, C and D are changed to a predetermined timing in the dual port memory, and then a header is added by the header addition unit, and the storage unit 1
13 is output. FIG. 13 is a block diagram showing a configuration of a decoding unit according to the present modification, which corresponds to the encoding unit. In the figure, reference numeral 179 is a header removing unit, and reference numerals 180 to
183 is a dual port memory A, B, C, D, reference numeral 1
Reference numeral 84 is a write counter, reference numeral 189 is a read counter, and reference numeral 194 is a system clock generator. Note that these have the same functions as the constituent elements of the encoding unit according to the second embodiment.

Reference numerals 185 to 188 denote inverse quantizers A, B,
C and D, and the bit length compressed by the quantizer of the encoding unit is expanded to data of a predetermined length. Reference numerals 190 to 19
Reference numeral 3 denotes interpolators A, B, C and D, which double pixels in the vertical direction. Reference numerals 195 and 197 denote vertical low-pass filters A and B, which pass only low-frequency components in the vertical direction. Reference numerals 196 and 198 denote vertical high-pass filters A and B, which only pass high-frequency components in the vertical direction. .

Reference numerals 199 and 1101 denote interpolators E and F, which double the pixels in the horizontal direction. Further, reference numeral 1100 is a horizontal low-pass filter, which transmits only low-frequency components in the horizontal direction, and reference numeral 1102 is a horizontal high-pass filter, which transmits only high-frequency components in the horizontal direction. Reference numeral 1103 is a signal combining unit, and reference numeral 11
Reference numeral 04 is a D / A converter.

The partial moving image data signal reaching the decoding unit 115 is written in the dual port memories A, B, C and D according to the coding type recorded in the header portion, and according to the address output from the read counter 189. It is read out sequentially. When there are four partial moving image data signals that have reached the decoding unit 115, all the output signals from the dual port memories A, B, C and D are used and decoded.

The output from the dual port memory A180 is a partial moving image signal A containing only low frequency components in both horizontal and vertical directions, expanded by the inverse quantizer A185 to a predetermined bit length, and then by the interpolator A190. Pixels are doubled in the vertical direction. Then, the vertical low-pass filter A195 removes the high-frequency noise component due to the above interpolation, and then outputs it to the interpolator E199.

The output from the dual port memory B181 is a partial moving image signal B including a low frequency component in the horizontal direction and a high frequency component in the vertical direction, and the inverse quantizer B181.
After being expanded to a predetermined bit length in 186, the interpolator B191 doubles the pixels in the vertical direction. The vertical high-pass filter A196 removes the low frequency noise component by the above interpolation, and then the interpolator E
It is output to 199.

The interpolator E199 doubles the pixels in the horizontal direction, and the horizontal low-pass filter 1100 removes the horizontal low-frequency noise from the signal, and outputs the signal to the synthesizing unit 1103. On the other hand, the output from the dual port memory C182 is a partial moving image signal C including a high frequency component in the horizontal direction and a low frequency component in the vertical direction, and expanded by the inverse quantizer C187 to a predetermined bit length. Thereafter, the interpolator C192 doubles the pixels in the vertical direction. Then, the vertical low-pass filter B197 removes the high frequency noise component in the vertical direction by the above interpolation, and then the interpolator F11
It is output to 02.

Further, the output from the dual port memory D183 is a partial moving image signal D containing only high frequency components in both horizontal and vertical directions, and the interpolator D193 doubles the pixels in the vertical direction. Then, the vertical high-pass filter B198 removes the low-frequency noise component due to the above interpolation, and then outputs it to the interpolator F1101.

The interpolator F1101 horizontally interpolates the pixel twice, and then the horizontal high-pass filter 1
At 102, noise of low frequency components in the horizontal direction is removed,
It is output to the combining unit 1103. The synthesizer 1103 synthesizes the signal output from the horizontal low-pass filter 1100 lacking the horizontal high-frequency component and the signal output from the horizontal high-pass filter 1102 lacking the horizontal low-frequency component to obtain the original signal. The moving image signal is reproduced and output to the D / A converter 1104. D / A converter 110
In 4, the moving image signal is converted into a predetermined analog video signal and output to the display 117.

When the number of partial moving image data signals reaching the decoding unit 115 is less than 4, as in the second embodiment,
From the dual port memory corresponding to the unreached partial moving image signal, a pseudo signal of 0 component is output and decoded. The present invention may be applied to a system including a plurality of devices or an apparatus including a single device. Further, it goes without saying that the present invention can be applied to the case where it is achieved by supplying a program to a system or an apparatus.

[0087]

As described above, according to the present invention,
By controlling the relaying or abandonment of moving image data according to the priority order according to the moving image data transmission load, the transmission bandwidth according to the transmission load of the transmission line is transmitted to the terminal that issued the moving image data transmission request. Is assigned, the occurrence of a wait state for a transmission request can be reduced, and the responsiveness can be improved.

Also, by encoding / decoding the moving image data based on the priority order of the moving image data and the permissible delay time of transmission, the efficiency of use of the transmission path is improved and the occurrence of waiting states for transmission requests is reduced. And the responsiveness can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a moving image network system according to a first embodiment of the present invention.

FIG. 2 is a detailed block diagram of an encoding unit 22 included in the moving image network system according to the embodiment.

FIG. 3 is a detailed block diagram of a decoding unit 21 included in the moving picture network system according to the embodiment.

FIG. 4 is a diagram showing a configuration example of a pixel unit according to an embodiment.

FIG. 5 is a diagram showing a quadruple interleaved sampling signal with a period four times as long as a pixel period of an input moving image signal for use in A / D converters A, B, C, and D.

FIG. 6 is a diagram showing another example of division of a moving image signal into pixel units.

FIG. 7 is a diagram showing an example in which the moving image data transmission unit 19 divides the frame period of a video signal into eight slots in the embodiment.

FIG. 8 is a diagram showing an example in which moving image data transmitted in descending order and transmission load information are multiplexed by a multiplexing unit I 59.

FIG. 9 is a block diagram showing a configuration of a moving image network system according to a modification of the first embodiment.

FIG. 10 is a block diagram showing a configuration of a moving picture network system according to a second embodiment of the present invention.

FIG. 11 is a detailed block configuration diagram of a storage unit 113 included in the moving image network system according to the second example.

FIG. 12 is a block diagram showing a modified example of an encoding unit constituting the moving picture network system in the second embodiment.

13 is a block diagram showing a configuration of a decoding unit corresponding to a modification of the encoding unit shown in FIG.

FIG. 14 is a diagram showing a conventional moving image network configuration constructed as an optical ring network.

[Explanation of symbols]

 1-5, 101-105 Terminals 6-15, 106-110 Transmission line 16 Transmission load information transmission part 17 Transmission load information reception part 18 Moving image data receiving part 19 Moving image data transmission part 20,114 Control part 21,115 Decoding Encoding unit 22,116 Encoding unit 23,117 Display 24,118 Video camera

Claims (11)

[Claims] 1. A moving image network system for connecting a plurality of terminals to each other via a transmission path, inserting moving image data into a plurality of slots, and transmitting and receiving the moving image data between the terminals. A unit for generating transmission load information relating to transmission of moving image data on the transmission path; a unit for transmitting and receiving the transmission load information; and the moving image based on a predetermined encoding conversion formula according to the transmission load information. A moving image network system, comprising: an encoding unit that encodes data; and a decoding unit that decodes the moving image data based on a predetermined decoding conversion formula according to the transmission load information. . 2. The transmission load information includes information specifying a transmitting terminal of moving image data, information specifying a receiving terminal of moving image data, a transmission priority order of moving image data, and an encoding type. The moving image network system according to claim 1. 3. The moving picture network system according to claim 1, wherein the coding means changes the coding operation according to the number of the slots into which the moving picture data is inserted. 4. The encoding means discards, when there is no empty slot, data having a transmission priority of the moving image data equal to or lower than a specific priority from the slot, and moving image data having a higher priority than the data is transferred to the slot. 3. The moving picture network system according to claim 2, wherein the moving picture network system is inserted into the moving picture network system. 5. The moving image network system according to claim 2, wherein the decoding means changes a decoding operation according to the encoding type. 6. The encoding means divides the moving image data into pixel units each consisting of N (N is an integer) pixels, and divides the pixel set into two pixels until one pixel belongs to the pixel set. 2 for each image signal of each pixel set
The moving picture network system according to claim 1, wherein the moving picture data is coded using N coding transformation values obtained from N-1 average values. 7. A moving image network system in which a plurality of terminals are connected to each other via a transmission path and moving image data is transmitted and received between the terminals, and a storage means for storing the moving image data, A unit for generating management information of moving image data, a unit for transmitting and receiving the management information, an encoding unit for encoding the moving image data based on a predetermined encoding conversion formula according to the management information, A moving image network system, comprising: a decoding unit that decodes the moving image data based on a predetermined decoding conversion formula according to the management information. 8. The management information includes information for identifying a transmitting terminal of moving image data, information for identifying a receiving terminal of moving image data, a transmission priority order of moving image data, an encoding type, and a moving image to the storage means. 8. The moving image network system according to claim 7, which includes an image data writing start address and a writing end address, a moving image data transmission time, and a moving image data allowable delay time. 9. The storage means stores the moving image data in a predetermined area in accordance with the transmission priority order of the moving image data, and further, when there is untransmitted moving image data in the area, the moving image. 9. The moving image network system according to claim 8, further comprising a data determining unit that determines validity of the moving image data based on image data transmission time and the moving image data allowable delay time. 10. The data determining means determines that the untransmitted moving image data is valid when a time obtained by adding the moving image data transmission time and the moving image data allowable delay time is larger than a current time, 10. The moving image network system according to claim 9, wherein when the time is smaller than the current time, the untransmitted moving image data is determined to be invalid and is discarded. 11. The encoding means encodes the moving image data into N
A pixel unit made up of (N is an integer) pixels is set as a pixel set, and the pixel set is divided into two until one pixel belongs to the set, and 2N-1 pieces of image signals of each pixel set The moving image network system according to claim 7, wherein the moving image data is encoded using N encoded conversion values obtained from an average value.