JPH0731905B2 - High-speed access method of video image - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention combines a video tape (VTR) system, a video disk (VD) system, and a computer (including a personal computer) to record a video image recorded for a long time. It is about how to get fast access to the parts you want.

[Prior Art] As a method of recording and reproducing a video image (hereinafter, abbreviated as "moving image"), there are a video tape system and a video disk system.

The videotape system records on a videotape and is roughly classified into a VHS system and a beta system. The videotape system allows long-term recording for up to several hours. Thus, in order to access the desired part of the video recorded on the videotape for a long time, fast-forward or fast-rewind the videotape, stop and play it, and if it is not the desired part, fast-forward again. Or try rewinding. By repeating such operations, the desired portion is searched for by trial and error. A method has also been developed and used in which an address is added to a track of a video tape and high-speed automatic cueing is performed by this address.

The video disc system is a digital recording method on a video disc, and the recording time is 5 minutes or maximum 1
It's about time. In the video disk system, due to the address on the video disk, unlike the video tape system,
The desired portion of the moving image can be instantaneously and accurately searched with one operation.

[Problems to be Solved by the Invention] Although the video tape system has an advantage of being capable of recording and reproducing for a long time, it takes a long time because it takes a running time of the video tape to find a desired moving image portion. If the tape position when the video tape is stopped and the tape position where the desired moving image portion is recorded are far apart from each other, a particularly long cue time is required.

On the other hand, since the video disc system searches for an address on a digital disc, the cue is extremely fast and accurate. However, the video recording time on the video disk is only 5 minutes or at most 1 hour as described above, and the recordable time is remarkably shorter than that of the video tape system, and it is impossible to record a large amount of video content. Is.

The present invention overcomes the above-mentioned drawbacks of the video tape system and the video disc system, and uses only the advantages in combination to achieve both long-time recording of a moving image and extremely fast cueing of a desired moving image portion. The purpose is to provide a possible method.

Another object of the present invention is to provide a method of displaying characters or images input from a computer on a video screen, either alone or together with the video screen.

[Means for Solving the Problems] In the present invention, a moving image is recorded on a video tape, an address is attached on the video tape for the entire recorded moving image, and the content of the recorded moving image is appropriately moved. It is divided into unit parts, and only the first few minutes of each unit part of the moving picture is recorded on the video disc, and an address corresponding to the address on the video tape for the entire recorded moving picture is given on the video disc. Alternatively, by using the frame number attached to the video disc in advance as the address, the recorded video tape and the video disc are set in a video tape reproducing device and a video disc reproducing device, respectively, to which a computer is connected, Enter the address of the video unit you want to view from the computer and use the program on the computer to enter it. Access to the moving image unit is started for the video tape and the video disc, and the moving image unit is displayed on the video screen by the video disc while the video tape is running toward the moving image unit. When the video tape is reproduced and displayed, and when the video tape reaches the position of the portion of the moving image unit that is being reproduced and displayed by the video disc at that time, the computer detects this and stops the reproduction by the video disc and stops the reproduction. High-speed access to a video image is performed by starting reproduction with a video tape and thereafter reproducing with the video tape until the end of the moving image unit.

It is convenient to connect the video tape reproducing device and the video disc reproducing device in common to a single video screen.

Further, when the moving image unit portion is finished only by recording for a few minutes on the video disc, the playback display is performed only on the video disc, and the video tape is not accessed, but the high speed access to the video image is performed. To do.

Further, if necessary, a computer program causes the characters or images input by the computer to be displayed on the video screen alone or together with the image from the video tape or video disc.

[Examples] Hereinafter, specific examples of the present invention will be described in detail.

First, the entire content of the moving image is recorded on the video tape, and the entire recorded moving image is given an address on the video tape. Next, the entire recorded moving image content is divided into appropriate unit parts, that is, for each program. On the other hand, on the video disc, only the first few minutes of each unit (program) recorded on the video tape are recorded, and an address corresponding to the address on the video tape is attached to the entire recorded moving image. Or use the frame number pre-assigned on the video disc as the address.

The video tape and the video disc on which the moving image contents are recorded in this way are paired and set in the video tape reproducing device and the video disc reproducing device connected to the computer, respectively. These two playback devices are commonly connected to a single video screen.

Next, the desired moving image unit is accessed by the computer to the video tape and the video disc, respectively, according to the program. The access signal is transmitted to the video tape reproducing device and the video disc reproducing device, and access is started respectively. With the video tape, the video tape is run and searched until the desired moving image portion is reached. On the other hand, in the video disc, the desired moving image unit portion is almost instantaneously accessed as described above.
Until the video tape runs and reaches the position of the desired moving image portion, the moving image unit portion is reproduced by the video disc and displayed on the video screen. When the running video tape reaches the position of the part currently displayed by the video disc of the desired moving image unit, the computer detects this and stops the video disc, and the video tape then images from the stopped moving image part. Start to display.

When the moving image unit portion ends after only a few minutes of recording on the video disc, only the video disc is accessed and played back, and the video tape is not required to be accessed.

It is also easy to display the characters and images input from the computer individually or together with the video image on the video screen by the program of the computer.

The synchronization between the video tape, the video disk and the computer screen can be appropriately performed by a computer program.

[Effects of the Invention] Especially, there are already many practical examples of the educational effect being enhanced by using a personal computer screen and a video screen together in a CAI educational system. According to the method of the present invention, it is possible to record moving picture contents for a long time, and moreover, a desired moving picture unit portion is almost instantaneously accessed and reproduced, and if necessary, a character or an image input by a personal computer can be independently recorded. Alternatively, since it can be displayed together with a video image, the learner's image waiting time is eliminated, frequent video disc replacement operations are unnecessary, and the learning effect is significantly enhanced. The method of the present invention can of course be used not only in the field of CAI education systems, but also in many other video-related fields with similar advantages.

Claims (4)

[Claims] 1. A moving image is recorded on a video tape, and the entire recorded moving image is addressed on the video tape.
The recorded moving image content is divided into moving image unit parts as appropriate, only the first few minutes of each moving image unit part are recorded on a video disk, and the entire recorded moving image corresponds to the address on the video tape. The recorded video tape and the video disc are recorded by adding an address on the video disc or by using a frame number given in advance on the video disc as the address.
Set them in a video tape player and a video disk player, which are connected to a computer respectively, and enter the address of the moving image unit portion to be viewed from the computer to access the moving image unit portion for the video tape and the video disc. The video tape reproduces and displays the moving image unit portion on a video screen while the video tape is running toward the moving image unit portion, and the video tape at that time point of the moving image unit portion. When the computer reaches the position of the portion being reproduced and displayed by the video disc, the computer detects this and stops the reproduction by the video disc and starts the reproduction by the video tape, and thereafter, until the end of the moving image unit portion. Characterized in that the video tape is reproduced. That, high-speed access method of the video image. 2. The high-speed access method for video images according to claim 1, wherein the video tape reproducing device and the video disc reproducing device have a common video screen. 3. When the moving image unit portion is finished only by recording for several minutes on the video disc, only the video disc is accessed and played back, and the video tape is not accessed. The high-speed access method for video images according to claim 1 or 2, characterized in that. 4. A computer-input character or image is further displayed on the video screen, either alone or together with the image from the video tape or video disc, according to any one of claims 1 to 3. The high-speed access method of the video image described in.