JPH0549026A - Video edit reproduction method - Google Patents

Abstract

PURPOSE:To realize the video edit reproduction method from which a video image with high quality is used even from a transmission line of a low bit rate. CONSTITUTION:A coder 5 is used to encode a video image from a video input output device 4 in a device 100 and the coded signal is sent to an opposite device 100' via a transmission line 3 of a low bit rate and stored in a video storage section 6'. A video image is similarly stored from the device 100' to a video storage section 6 of the device 100. When the same coded video image is stored in the both, communication controllers 2, 2' reproduce the video image at the same time thereby allowing the user view the excellent video image as the feature of the system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video editing and reproducing method in which a coded video is transferred to a remote place in advance by using a communication means, and the video transmitting side and the video receiving side can watch the video according to their intentions. It is about.

[0002]

2. Description of the Related Art Video communication represented by a video conference is a type of communication in which both parties constantly transmit and receive video. In this type of communication, the video was very informative,
A device called a codec is required to prepare a large-capacity transmission line or to compress video information. The image quality when using the codec depends on the capacity of the transmission path, and unless the capacity is small, the quality is unavoidable. Therefore, in general, when the communication cost is emphasized, the quality of the image is sacrificed.

[0003]

However, depending on the case, there are cases in which the quality is not sufficient because it is normally used, but an image with better quality is required. For example, when conducting a video conference between people who are acquainted with each other, the image quality is not important when it is desired to know the reaction of each other, and it is sufficient to understand the situation on the spot. However, if the quality of the sample images used in the conference is not good and the understanding of the contents becomes insufficient, it is desirable to improve the quality of the images.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is to provide a video editing and reproducing method capable of using high quality video not only in high bit rates but also in low bit rate transmission lines. ..

[0005]

According to the video editing / reproducing method of the present invention, the capacity of the transmission path is at least 2 via a transmission path having a bit rate low enough to send a video with poor image quality.
One assumption is that the person is communicating. In the present invention, an image that requires good image quality is encoded in advance by using an image compressor (hereinafter referred to as a coder), and this is taken in advance for several times over a low bit rate transmission line. After sending them, both of them store the same coded video and start using it. At this time, the time required to transmit the video will be longer than the reproduction time, but it becomes possible to obtain a video with good image quality. As described above, by simultaneously reproducing the coded video shared by the video transmitting side and the video receiving side, it becomes possible to view a good video.

Furthermore, according to the present invention, both the video transmitting side and the video receiving side reproduce the video at the same time, but the control signal can be generated in real time in either of them via the transmission line. For this reason, it is possible to transfer the video in real time so that they are in the same state as if they are watching the same video, and the video can be played back regardless of which of the video transmitter and receiver receives the control signal. Compared to the one-way one-way video transfer, it is possible to reproduce and edit by the intention of the receiving side. Further, according to the present invention, since the control signal has a very small amount of information, the transmission line is almost unused, so that an image other than the image currently used at that time is available in the transmission line. To transfer and use the transmission path effectively.

[0007]

When the video editing / reproducing method according to the present invention is used, a good video can be viewed without being restricted by the quality of the video due to the capacity of the transmission path. In addition, since both the transmitter and the receiver store the coded video as it is, it is possible to view the video of exactly the same image quality, unlike the case where the analogized video is stored. In addition, since the signal that controls the video playback can be transmitted in real time, good-quality video can be viewed by both parties at the same time. In addition to standard playback, fast-forward playback and frame-by-frame playback are also available for the control signal. By adding a control signal such as reverse playback, it becomes possible for both parties to watch a good video as if the video was being sent in real time. Further, since either of the two parties may transmit this image, the image can be freely reproduced not only by the transmitting side but also by the receiving side, so that collaborative editing and collaborative work can be performed remotely. Further, another video can be transferred by using the idle time of the transmission line in which the control signal is not generated, and the transmission line can be effectively used.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a structural example of two sets of devices 100 and 100 'used in the video editing / reproducing method of the present invention. These devices 100 and 100 'are connected via a transmission line 3. 1 and 1'are main controllers for controlling the whole device,
A commercially available workstation was used in the examples of the present invention. Communication controllers 2 and 2'control the transmission line 3. 4 and 4 ′ are video input / output devices, such as a television camera,
A video tape deck, a laser disk, a rewritable optical disk player, etc. correspond to this and mainly generate or store an analog video signal. 5 and 5'are the video input / output device 4
And 4'is a coder for encoding and compressing the generated video, and the video data is stored in the video storage units 6 and 6 ', respectively. The images stored and coded in this way can be transferred to the image storage units 6 and 6'of the other party through the communication controllers 2 and 2'and the transmission path 3, respectively. Also, in order to reproduce this coded image and view it on the monitors 8 and 8 ',
Decoders 7 and 7'for decoding the coded video and restoring it are used. Here, the video composited by the decoders 7 and 7'can be viewed directly on the monitors 8 and 8 ', but it can also be recorded by the video input / output units 4 and 4'. The control of these devices is performed by the control signals of the main controllers 1 and 1 ', and the control signal passes through the path shown by the dotted line in the figure. Further, the video signal passes through the solid line path.

In order to operate this, a two-step operation is performed. The first stage is the transfer of the video shown in the flow chart of FIG. In addition, (S1)-(S3) shows each step in FIG. Here, a case of transferring an image from the devices 100 to 100 'will be described. First, the video transfer is performed by the communication controller 2
And 2'connect the transmission line 3 (S1). Next, in the process of creating and storing the encoded video (S2), the video input / output device 4
The image generated from the above is encoded by the coder 5, and the encoded image is stored in the development storage unit 6. Next, in the process of transferring and storing the coded video (S3), the coded video stored in the video storage unit 6 is transmitted via the communication controller 2, the transmission path 3, and the communication controller 2'on the receiving side to the device. The image is transferred and stored in the image storage unit 6'on the side of 100 '. At this time, the method of encoding the video output from the video input / output unit 4 and storing it in the video storage unit 6 is as follows.
There are two types of methods, one is to transfer the video while accumulating and the other is to transfer the video in parallel, and a method to transfer the video after the storage is completed, but either method may be adopted here. It is also possible that the video storage speed and the transfer speed are different. If the transfer speed is fast, the video can be sent in a shorter time than the time required to watch the video, and the time until the next stage is shortened. be able to. Further, when the transfer speed is slow, it becomes possible to transfer a good image even using the existing relatively low-speed transmission path. However, in this case, the transfer time will be long. In this way, the transferred video is stored in the video storage sections 6 and 6'on the transmitting side and the receiving side as it is as the coded video. Therefore, it is compounded by the decoders 7 and 7'and the monitors 8 and 8 '. The images viewed in can be made to be of the same quality on both sides, and the same image can be played over and over again.

The second stage is the simultaneous reproduction of the images shown in the flow chart of FIG. Note that (S11) to (S14) indicate each step. By the way, as a control signal generated by either the main controller 1 or 1 ', a playback function such as the beginning of a video, standard playback, fast forward playback, frame forward playback, still image playback, reverse playback, and video copying are provided. There are editing functions such as combining, deleting, and organizing. Of these, the control signal for the reproducing function is generated from the main controller 1 or 1'in response to the generation of the control signal for reproducing the image in step (S11) of FIG. This control signal is sent to the video storage units 6 and 6'on both the transmitting side and the receiving side (S
12). In accordance with this control signal, the video storage units 6 and 6'reproduce the video information obtained by encoding the designated range by the designated reproduction method, and the decoders 7 and 7'reproduce the decoded video according to this video information (S13). ). This decoded video is displayed on the monitor 8
And 8'playback the video (S14), but this playback is played back almost at the same time due to an error of the arrival delay of the playback control signal on the transmitting side and the receiving side. The image can be viewed in the same manner as the transmitted image, and both devices 100 and 100 'generate a control signal, so that either device can reproduce freely. At this time, the control signal for reproducing the image has a small amount of information and is in a state equivalent to that almost no information is transmitted to the transmission line 3 having a capacity capable of transmitting the image. To use this state effectively,
It can be used to send an image used for a purpose other than the currently viewed image through the same transmission path.

FIG. 4 shows that when the transmission line 3 is connected,
7 is a flowchart for transferring video information by utilizing the free space of the transmission path 3. In this figure, (S21) to (S27) show each step. In response to the video transfer request (S21), the coder 5 first creates an encoded video and stores it in the video storage unit 6 (S22). Next, whether or not the transmission path 3 is connected is determined using the communication controller 2 (S23), and if the transmission path 3 is not connected, it is determined whether or not to wait until connection is established (S24). If the transmission line 3 is connected, it is determined whether or not the transmission line 3 is free (S25), and the free space is used to transfer the coded video from the video storage unit 6 on the transmission side to the video storage unit 6'on the reception side. And accumulates (S26). At this time, if the transmission path 3 is blocked by a control signal or the like, the image transfer may be temporarily interrupted, but it is confirmed that all the images have been transferred (S27).
finish. Using this method, a video is displayed on the device 100 and 1.
By using 00 ', another image can be transferred while both transmitting and receiving are listening to the image, and the transmission path 3 can be effectively utilized.

[0012]

According to the present invention, the encoded video is transferred in advance by using the communication means, and the transmitting side and the receiving side of the video share exactly the same encoded video. Therefore, the video is transferred in real time. In this case, even if the image quality is insufficient, it takes a long time to transfer, but good quality images can be transferred. Also, since both have the same encoded video, the image viewed on the monitor can be at the same level on both the transmitting side and the receiving side. Also,
Since the control signal for auditioning this is simultaneously output to the video storage units on the transmitting side and the receiving side, the same video can be auditioned at the same time regardless of the bit rate, regardless of the distance between the two. Further, since there is a lot of vacancy in the transmission line used for transferring the control signal, the vacancy is used to transfer the image, so that the transmission line can be effectively used.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an apparatus and a transmission line used in the present invention.

FIG. 2 is a flowchart showing video transfer and storage for explaining the operation of the present invention.

FIG. 3 is a flowchart showing video reproduction control and reproduction for explaining the operation of the present invention.

FIG. 4 is a flow chart showing transfer and storage of an image using a free space of a transmission path according to the present invention.

[Explanation of symbols]

 1 main controller 1'main controller 2 communication controller 2'communication controller 3 transmission line 4 video input / output device 4'video input / output device 5 coder 5'coder 6 video storage unit 6 'video storage unit 7 decoder 7' Decoder 8 monitor 8'monitor 100 device 100 'device

Claims (2)

[Claims] 1. The video information coded by a coder is stored in a video storage device on the transmission side, and the coded video information is transferred to a video storage device on the reception side separately provided by using communication means, and thereafter. A video editing / playback method, characterized in that a control signal for video playback or editing is transferred using a communication means so that the video storage devices on the transmitting side and the receiving side simultaneously perform video playback or editing. .. 2. When the encoded video information is transferred to the video storage device on the receiving side, the video information is transferred by utilizing an empty area of a transmission line when transferring a control signal other than the video information. The video editing / reproducing method according to claim 1, wherein