JP2003284072A - Moving image transmitter and moving image communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a deterioration in quality of a reproduced image caused by the delay of compression coding processing, transmission delay of compressed image data, or a transmission error, and to prevent accumulation of delay time intervals. <P>SOLUTION: A moving image communication system is provided with a moving image transmitter 10 which transmits compressed image data obtained by compression-coding original image data of a moving image via a network, and a moving image display 20 which displays reproduced image data obtained by decoding the compressed image data. The image transmitter 10 is equipped with a compression coding means 12 which forms two kinds of compressed image data of I/P frames from the original image data. The coding means 12 suspends compression coding processing of a frame, and performs compression-coding processing of the next frame, when processing time for compression coding of the one frame exceeds a threshold value Tx to be set beforehand. Namely, accumulation of delay time intervals in the display 20 which receives compressed image data caused by delay of the compression coding processing can be prevented. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving picture transmitting apparatus and a moving picture communication system for transmitting a digitally compressed moving picture on a network such as a LAN or the Internet.

[0002]

2. Description of the Related Art In a conventional moving image communication system, original image data is captured and compressed and encoded by a moving image transmitting apparatus in accordance with a frame period, and digitally compressed image data is transmitted through a network such as a LAN or the Internet. A reproduced image obtained by transmitting the compressed image data to the moving image display device and decoding the compressed image data in the moving image display device is displayed on a display or the like. Here, the moving picture compression encoding method is MPEG4 or H.264. 263
For example, inter-frame prediction (motion compensation) utilizing similarity between temporally adjacent frames is used.

For example, H.264. In 263, as shown in FIG. 8, an I frame (intra-frame encoded frame) I1 obtained by encoding the entire original image X1 of one frame, and the next original image X2.
P frame (inter-coded frame) that is obtained from the difference between frames
P1 and P1 are generated, and one or a plurality of P frames P1 are inserted between I frames I1 to perform compression encoding of the image. However, while the I frame has a large amount of data, it can be reproduced (displayed) independently, whereas the P frame has a small amount of data but cannot be reproduced (displayed) independently.

[0004]

By the way, in the moving image communication system as described above, generally 20 to 30 fps.
Encoding and decoding processing is performed at a frame rate of about 1 to 2, and a reproduced image is refreshed by inserting 1 to 2 I frames per second. However, in the above-described conventional moving image communication system, the moving image display device is caused by a delay in the compression encoding process in the moving image transmission device or a transmission delay or a transmission error of the compressed image data from the moving image transmission device to the moving image display device. However, there is a problem in that the image quality of reproduced images deteriorates and the delay time is accumulated. For example, as shown in FIG. 9, the moving image transmission apparatus converts compressed image data I0, I1, ..., P0, P1, ... Of I frame and P frame from original image data f0, f1 ,. Generated and transmitted to the moving image display device, the moving image display device decodes the compressed image data I0, I1, ..., P0, P1, ... And reproduced image data f0 ′, f1 ′ ,. Consider the case where it is generated and displayed on a display or the like. At this time, if a delay occurs in the compression encoding processing of the P frame P3 in the moving image transmitting apparatus, the subsequent P frames P4 and P4 are generated.
A transmission delay occurs in P5, ..., In the moving image display device, the delay time may be accumulated, or the P frame P5 may be lost without being transmitted due to a transmission error. In such a situation, since the reproduced image is not refreshed as described above, the image quality of the reproduced image may be significantly deteriorated, or the moving image may not be displayed at all.

The present invention has been made in view of the above circumstances, and an object of the present invention is to delay the compression encoding process, the transmission delay of compressed image data, or the deterioration of the image quality of a reproduced image due to a transmission error and the accumulation of the delay time. An object is to provide a moving image transmitting apparatus and a moving image communication system which are prevented.

[0006]

In order to achieve the above object, the invention of claim 1 is a moving image transmission for transmitting compressed image data obtained by compression-encoding original image data of a moving image by inter-frame prediction through a network. The apparatus is provided with compression encoding means for generating two types of compressed image data of intra-frame encoded frames and inter-frame encoded frames from original image data, and transmission means for transmitting the compressed image data through a network. The conversion means is 1
When the processing time of compression encoding of a frame exceeds a preset threshold value, the compression encoding processing of the frame is stopped and the compression encoding processing of the next frame is performed,
Accumulation of delay time on the side receiving the compressed image data can be prevented by the delay of the compression encoding process.

According to a second aspect of the present invention, in the first aspect of the present invention, when the compression coding processing time of the intra-frame coded frame exceeds a threshold value, the compression coding means moves from the original image data of the next frame to the intra-frame The feature is that an encoded frame is generated, and an intra-frame encoded frame can be reliably transmitted, and deterioration of image quality due to transmission delay or transmission error can be prevented.

In order to achieve the above object, a third aspect of the present invention is to provide a moving image transmitting apparatus for transmitting compressed image data obtained by compression-encoding original image data of a moving image by inter-frame prediction through a network, and receiving through a network. In the moving image communication system including the moving image display device that displays the reproduced image data obtained by decoding the compressed image data, the moving image transmission device includes the intra-frame encoded frame and the inter-frame encoded frame from the original image data. The moving image display apparatus includes a receiving unit that receives the compressed image data through the network, and a receiving unit that receives the compressed image data through the network. Decoding means for decoding the received compressed image data, and the decoded reproduced image data The compression encoding means of the moving image transmission apparatus, which includes a display means for displaying, causes the transmission means to transmit a dummy signal through the network when the processing time for compression encoding of one frame exceeds a preset threshold value. At the same time, when the compression encoding processing of the frame is completed, the compression image data is transmitted from the transmission means through the network, and the moving image display device reproduces when the display means has completed the decoding processing when the dummy signal is received. It is characterized in that the display of the image data is continued, and the deterioration of the image quality due to the delay of the compression encoding process can be prevented.

According to a fourth aspect of the present invention, in the third aspect of the present invention, when the dummy signal is not received and the compressed image data is not received within a preset prescribed time, the compression encoding is performed by the compression encoding means. A moving image display device is provided with a reset requesting means for transmitting a processing reset request through a network, and an inter-frame encoded frame is transmitted until the next intra-frame encoded frame is transmitted from the moving image transmission device. Even if this is done, it is possible to notify the moving image transmitting apparatus by a reset request that the reproduced image cannot be displayed normally on the moving image display apparatus.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the compression encoding means of the moving image transmitting apparatus interrupts the current compression encoding process upon receiving the reset request, and the latest intra-frame encoded frame. From the latest intra-coded frame when a reset request is made, and the inter-frame coded frame generated from the latest intra-frame coded frame is executed. By transmitting from the moving image transmission device to the moving image display device, the data amount can be smaller than that in the case of transmitting an intra-frame encoded frame with a large data amount, until the reproduced image is normally displayed after the reset request. The recovery time can be shortened.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the transmitting means periodically packet-compresses the compressed image data of the intra-frame encoded frame and the inter-frame encoded frame, In the cycle, the transmission period of the intra-frame encoded frame is set to be longer than the transmission period of the inter-frame encoded frame,
It is possible to reduce the frequency at which the reproduced image cannot be displayed on the moving image display device due to the transmission delay of the intra-frame encoded frame having a large data capacity, and it is possible to prevent the image quality of the reproduced image from deteriorating.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION (Embodiment 1) As shown in FIG. 1, a moving image communication system of this embodiment transmits compressed image data obtained by compression-encoding original image data of a moving image by inter-frame prediction through a network. Video transmission device 1
0 and a moving image display device 2 for displaying reproduced image data obtained by decoding compressed image data received through a network.
0 is a basic configuration. However, as shown in FIG. 2, in some cases, a hub 1 and a router 2 for constructing a LAN such as Ethernet (R) are included, and in some cases, a plurality of moving image communication systems are connected to each other via a LAN and the Internet. is there.

The moving image transmitting apparatus 10 is an image capturing means 11 for capturing a moving image using a television camera or the like.
Then, the original image data of the moving image captured by the image capturing means 11 is compression-encoded (for example, compression encoding by the moving image compression method of H.263) to convert the original image data into an intra-frame encoded frame ( Hereinafter, it will be referred to as an "I frame") and an inter-frame coded frame (hereinafter,
A compression encoding unit 12 for generating two types of compressed image data (referred to as “P frame”), a transmitting unit 13 for transmitting the compressed image data (I frame and P frame) through a network, and a frame period signal. The image capturing means 11 and the compression encoding means 12 are provided with a frame period signal generating means 14 and perform respective processes in synchronization with the frame period signal. The compression encoding process in the compression encoding unit 12, that is, the method of generating the I frame and the P frame is already known as described in the related art, and therefore detailed description thereof will be omitted.

On the other hand, the moving image display device 20 includes a receiving means 21 for receiving compressed image data (I frame and P frame) through a network, and a decoding means 22 for decoding the compressed image data received by the receiving means 21. Display means 23 for displaying the decoded reproduced image data, and frame period signal generating means 2 for generating a frame period signal.
4, and the decoding means 22 and the display means 23 perform their respective processes in synchronization with the frame period signal. The decoding process in the decoding means 22, that is, the method of generating the reproduced image data from the I frame and the P frame is already known as described in the related art, and therefore detailed description thereof will be omitted.

Next, the operation of this embodiment will be described with reference to FIG. Times t0, t1, t2, ... In FIG. 3 indicate processing start times divided at equal intervals in each frame period. Further, f0, f1, f2, ...
Original image data captured at 0, t1, t2, ...
I0 is compressed image data of I frame, P1, P2, ... Are compressed image data of P frame, f0 ′, f1 ′, f
Reference numerals 2 ', ... Reproduce image data obtained by decoding the compressed image data I0, P1, P2 ,.

First, the operation of the moving image transmitting apparatus 10 will be described. The image capturing means 11 captures a moving image at each processing start time t0, t1, ... In synchronization with the frame period signal to obtain original image data f0, f1. , Are obtained, the compression encoding means 12 starts the compression encoding processing for the original image data f0, f1, ... At each processing start time t1, t2, ... And the I frame I0 and the P frames P1, P2 ,. Of the compressed image data is transmitted from the transmission means 13 to the moving image display device 20 through the network at each processing start time t2, t3, .... Here, the compression encoding means 12 generates the compressed image data of the I frame I0 by intra-encoding (intra-frame encoding) the entire original image data f0, and
The P frame P1 is generated by calculating the difference between the frame I0 and the next original image data f1 (inter-frame coding), and the image data obtained from the I frame I0 and the P frame P1 (reproduced image data f0 ′ (The same image data) is stored in the frame memory and the image data and the next original image data f2 are inter-frame encoded to generate the next P frame P2.

On the other hand, in the moving picture display device 20, the decoding means 22 processes the compressed image data received by the receiving means 21 through the network at the processing start times t3, t.
4, decoding processing is started and I frames I0 and P
Reproduced image data f0 ', f1', ... are generated from the compressed image data of frames P1, P2, ..., and the display means 23 reproduces image data f0 ', f0', at each processing start time t4, t5 ,.
The reproduction process of f1 ', ... Is started and the reproduced image is displayed on the display or the like.

By the way, the compression encoding means 12 of the moving image transmitting apparatus 10 uses one frame (I frame or P frame).
When the processing time of the compression encoding of exceeds the preset threshold value Tx, the compression encoding processing of the frame is stopped and the compression encoding processing of the next frame is performed. For example, the compression encoding process of the P frame P3 starts from the process start time t4 and reaches the threshold Tx.
If it is not completed even after the passage of time, the compression encoding means 12 stops the compression encoding process of the P frame P3 and starts the compression encoding process of the next frame, that is, the P frame P4, before the stop. A P frame P4 is generated as a difference from the frame (P frame P2). In order to start the compression encoding processing of the P frame P4 at the original processing start time t5, it is necessary to set the threshold value Tx to an appropriate value that does not exceed the frame period.

Thus, the compressed image data of the P frame P3 is not transmitted from the moving image transmitting apparatus 10, and the moving image display apparatus 20 reproduces the reproduced image data f of the P frame P3.
Although 3'is lost, since the reproduced image data f4 'obtained by decoding the next P frame P4 is generated in synchronization with the frame period, the accumulation of the delay time described in the conventional example can be prevented. is there.

On the other hand, as shown in FIG. 4, the compression encoding process of the I frame I3 is assumed to be a threshold value Tx from the process start time t4.
If it is not completed even after the passage of, the compression encoding means 12 stops the compression encoding processing of the I frame I3 and starts the compression encoding processing of the next frame. At this time, although the P frame is originally generated, the I frame I
Since 3 is missing, the compression coding means 12 generates an I frame I4 from the original image f4.

Thus, even if the compressed image data of the I frame I3 is not transmitted from the moving image transmitting apparatus 10, the I frame I4 is generated and transmitted as the next frame, so that the moving image display apparatus 20 receives the I frame I3. However, the reproduced image data f3 'obtained by decoding the following is lost, but the reproduced image data f4' obtained by decoding the next I frame I4 is generated in synchronization with the frame period. The deterioration can be prevented.

(Embodiment 2) The moving picture communication system according to the present embodiment is equipped with the reset request means 25 in the moving picture display device 20 as shown in FIG. There is a difference from the first embodiment in that a receiving unit 15 for receiving via a network is provided in the moving image transmitting apparatus 10, and since the other configurations are common to the first embodiment, the common components are the same. The reference numerals are given and the description is omitted.

Next, the operation of this embodiment will be described with reference to FIG. For example, if the compression encoding means 12 of the moving image transmitting apparatus 10 does not complete the compression encoding processing of the P frame P3 even after the threshold Tx has passed from the processing start time t4, the compression encoding means 12 will generate the P frames. While continuing the compression encoding process of P3, a transmitting unit 1 transmits a dummy signal (indicated as "dummy" in FIG. 6) at the next process start time t5.
3, the compressed image data (P frame P3) is transmitted from the transmission means 13 through the network when the compression encoding processing of the P frame P3 is completed. In this case, the processing of the frame following the P frame P3 (P frame P4) is skipped.

On the other hand, in the moving picture display device 20, when the receiving means 21 receives the dummy signal through the network, the display means 23 reproduces the reproduced image data which has been decoded, in this case, the previous P frame. The display of the reproduction image data f2 ′ generated from P2 is continued from the processing start time t7 when the display of the reproduction image data f3 ′ originally generated from the P frame P3 is started. Then, when the composite of the delayed compressed image data of the next P frame P3 is completed, the reproduced image data f3 'is displayed from the next processing start time t8.

Thus, in the first embodiment, the reproduction image data is lost when the compression encoding process is delayed. However, in the present embodiment, the reproduction image data which is lost is reproduced immediately before the reproduction image data. By embedding with data, it is possible to suppress deterioration of image quality. When the moving image display device 20 receives the dummy signal, the cause of not receiving the compressed image data to be displayed next is not the transmission error or the transmission delay, but the compression encoding process in the moving image transmission device 10. It is possible to determine that the delay is due to the delay of the compression encoding process, and when the delay in the compression encoding process is the cause, the reset request described below is transmitted from the moving image display device 20 to the moving image transmission device 1.
Since it is not transmitted to 0, the time required for reset request processing in the moving image transmission device 10 and the moving image display device 20 is reduced by the time required for reset image processing (that is, the time until the reproduced image quality returns to normal). can do.

By the way, in the present embodiment, when the dummy signal is not received and the compressed image data is not received within the predetermined time set in advance due to the transmission error or the transmission delay,
For example, when the dummy signal is not transmitted from the moving image transmitting apparatus 10 and the time during which the compressed image data of the P frame P6 is not received by the receiving unit 21 of the moving image display apparatus 20 exceeds the preset specified time, the moving image is displayed. The reset request means 25 of the display device 20 sends a reset request for compression coding processing to the compression coding means 12 through the network, and the display means 13 keeps 1 until the next compressed image data is sent. The display of the reproduced image data f5 ′ generated from the immediately preceding P frame P5 is continued.

On the other hand, in the moving image transmitting apparatus 10, when the receiving means 15 receives the reset request via the network, the moving image display apparatus 20 normally reproduces the reproduced image even if the compression encoding means 12 transmits subsequent frames. It is determined that the frame cannot be displayed in the frame, and the compression encoding process of the frame (P frame P8 in FIG. 6) being performed at that time is interrupted to generate the P frame P9 from the latest I frame (I0 in FIG. 6). Transmitting means 13 by executing processing
Send more through the network.

In the moving image display device 20 which has received the compressed image data of the P frame P9, the reproduced image data f9 'is obtained from the difference between the latest I frame I0 stored in the memory by the decoding means 22 and the P frame P9. The image data is decoded and generated, and the display means 23 displays the reproduced image data f9 ′.

By transmitting a P frame generated from the latest I frame from the moving image transmitter 10 to the moving image display device 20 when there is a reset request,
Compared with the case of transmitting an I frame having a large data capacity, the data capacity can be small, and there is an advantage that the recovery time until the reproduced image is normally displayed after the reset request can be shortened. Further, when the P frame P9 is generated, the amount of memory consumption can be reduced as compared with the case where the latest P frame P7 is generated. That is, when the next P frame is generated based on the latest P frame, it is unknown when a transmission delay or a transmission error will occur.
This is because it is necessary to store the reproduced image data in the memory for all P frames after the latest I frame, which increases the memory consumption.

By the way, in the above-described first and second embodiments, when transmitting the compressed image data from the transmitting means 13 of the moving image transmitting apparatus 10, as shown in FIG. 7, the compressed image data of the I frame and the P frame are cycled. If a packet is transmitted in a dynamic manner and the I frame transmission period TI is set to be longer than the P frame transmission period TP in one cycle, the moving image display device 20 reproduces it due to the transmission delay of the I frame having a large data capacity. This is desirable because it is possible to reduce the frequency at which an image cannot be displayed and prevent deterioration of the quality of a reproduced image.

In the first and second embodiments, the H.264 standard is used as the moving picture compression encoding method. Although 263 has been illustrated, the technical idea of the present invention can be applied to general moving image communication systems that employ MPEG4 or another compression encoding method that uses inter-frame prediction.

[0032]

According to a first aspect of the present invention, in a moving image transmitting apparatus for transmitting compressed image data obtained by compression-encoding original image data of a moving image by inter-frame prediction through a network, an intra-frame coded frame from the original image data is transmitted. And compression coding means for generating two types of compressed image data of inter-frame coded frames, and transmission means for transmitting the compressed image data through a network, and the compression coding means processes compression coding of one frame. When the time exceeds the preset threshold value, the compression encoding process of the frame is stopped and the compression encoding process of the next frame is performed.
Due to the delay in the compression encoding process, it is possible to prevent the accumulation of delay time on the side receiving the compressed image data.

According to a second aspect of the present invention, in the first aspect of the present invention, when the compression encoding processing time of the intra-frame encoded frame exceeds a threshold value, the compression encoding means changes from the original image data of the next frame to the intra-frame. Since the encoded frame is generated, it is possible to reliably transmit the intra-frame encoded frame, and it is possible to prevent the deterioration of the image quality due to the transmission delay or the transmission error.

According to a third aspect of the present invention, the moving image transmitting apparatus for transmitting the compressed image data obtained by compression-encoding the original image data of the moving image by the inter-frame prediction through the network and the compressed image data received through the network are decoded. In a moving image communication system including a moving image display device that displays reproduced image data, the moving image transmission device generates two types of compressed image data, which are an intra-frame encoded frame and an inter-frame encoded frame, from original image data. The moving image display device includes a compression encoding unit and a transmission unit that transmits the compressed image data through a network.
A moving image transmitting apparatus comprising: a receiving unit that receives compressed image data via a network; a decoding unit that decodes the compressed image data received by the receiving unit; and a display unit that displays the decoded reproduced image data. When the processing time for compression coding of one frame exceeds a preset threshold value, the compression coding means causes the transmitting means to transmit a dummy signal through the network and at the time when the compression coding processing of the frame is completed. Since the compressed image data is transmitted from the transmission unit through the network, and the moving image display device continues to display the reproduced image data for which the decoding process is completed when the display unit receives the dummy signal,
There is an effect that the deterioration of the image quality due to the delay of the compression encoding process can be prevented.

According to a fourth aspect of the present invention, in the third aspect of the present invention, when the dummy signal is not received and the compressed image data is not received within a preset prescribed time, the compression encoding is performed by the compression encoding means. Since the moving image display device is equipped with the reset request means for transmitting the processing reset request through the network, even if the inter-frame encoded frame is transmitted until the next intra-frame encoded frame is transmitted from the moving image transmission device. There is an effect that it is possible to notify the moving image transmitting device of a reset request that the reproduced image cannot be normally displayed on the moving image display device.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the compression encoding means of the moving image transmission apparatus interrupts the current compression encoding processing upon receiving the reset request, and the latest intra-frame encoded frame. The inter-frame coded frame generated from the latest intra-frame coded frame is transmitted as a moving image when a reset request is made because the process of generating the inter-frame coded frame from the By transmitting from the device to the moving image display device, the data capacity is smaller than when transmitting an intra-frame encoded frame with a large data capacity, and the recovery time until the playback image is normally displayed after the reset request Has the effect of shortening.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the transmitting means periodically packet-compresses the compressed image data of the intra-frame coded frame and the inter-frame coded frame. Since the transmission period of the intra-frame coded frame is set to be longer than the transmission period of the inter-frame coded frame in the cycle, the playback image on the moving image display device is delayed due to the transmission delay of the intra-frame coded frame having a large data capacity. It is possible to reduce the frequency at which the image cannot be displayed, and it is possible to prevent deterioration of the image quality of the reproduced image.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment.

FIG. 2 is a diagram showing a system configuration example of the above.

FIG. 3 is a time chart for explaining the above operation.

FIG. 4 is a time chart for explaining the above operation.

FIG. 5 is a block diagram showing a second embodiment.

FIG. 6 is a time chart for explaining the above operation.

FIG. 7 is a time chart for explaining the operation of the above.

FIG. 8 is an explanatory diagram illustrating an example of a compression encoding method.

FIG. 9 is a time chart for explaining the operation of the conventional example.

[Explanation of symbols]

10 Video transmission device 11 Image capture means 12 compression coding means 13 Transmission means 20 Moving image display device 21 Receiving means 22 Decoding means 23 Display means

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor, Ryo Ito             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company (72) Inventor Takashi Nihonsugi             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company F term (reference) 5C059 KK34 MA00 MA04 MA05 PP05                       PP06 RC08 SS08 TA16 TB04                       TC18 TD06 TD12 UA02 UA05                       UA33

Claims (6)

[Claims] 1. A moving image transmitting apparatus for transmitting, via a network, compressed image data obtained by compression-encoding original image data of a moving image through inter-frame prediction, in which the original image data is converted into an intra-frame encoded frame and an inter-frame encoded frame. A compression encoding unit that generates two types of compressed image data and a transmission unit that transmits the compressed image data through a network are provided. The compression encoding unit has a threshold value in which the processing time of compression encoding of one frame is preset. When exceeding, the moving image transmitting apparatus is characterized in that the compression encoding process of the frame is stopped and the compression encoding process of the next frame is performed. 2. The compression encoding means generates an intra-frame encoded frame from the original image data of the next frame when the compression-encoding processing time of the intra-frame encoded frame exceeds a threshold value. Item 1. The moving image transmission device according to item 1. 3. A moving image transmitting apparatus for transmitting compressed image data obtained by compression-encoding original image data of a moving image by inter-frame prediction through a network, and reproduced image data obtained by decoding compressed image data received over the network. In the moving image communication system including the moving image display device, the moving image transmitting device includes a compression encoding unit that generates two types of compressed image data of the intra-frame encoded frame and the inter-frame encoded frame from the original image data. A moving image display apparatus, a receiving means for receiving the compressed image data through the network, and a decoding means for decoding the compressed image data received by the receiving means. ,
Display means for displaying the decoded reproduced image data, and the compression encoding means of the moving image transmission device is configured to output a dummy signal when the processing time for compression encoding of one frame exceeds a preset threshold value. And the compressed image data is transmitted from the transmission means through the network when the compression encoding processing of the frame is completed, and the moving image display device decodes the display means when the dummy signal is received. A moving image communication system, characterized by continuing to display the reproduced image data for which the conversion processing has been completed. 4. A reset requesting means for transmitting a reset request for compression encoding processing to the compression encoding means through a network when a dummy signal is not received and compressed image data is not received within a preset specified time. The moving picture communication system according to claim 3, wherein the moving picture display device is provided with. 5. The compression encoding means of the moving image transmission apparatus, when receiving the reset request, interrupts the current compression encoding processing and executes the processing of generating the inter-frame encoded frame from the latest intra-frame encoded frame. 5. The transmitting means transmits the data through a network.
The moving image communication system described. 6. The transmitting means periodically packet-compresses the compressed image data of the intra-frame encoded frame and the inter-frame encoded frame, and the transmission period of the intra-frame encoded frame within one period is the inter-frame encoded frame. The moving image transmitting apparatus or the moving image communication system according to any one of claims 1 to 5, wherein the transmitting period is set to be longer than the transmitting period.