Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
2000-05-11
2004-07-13
Kelley, Chris (Department: 2613)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000, C386S349000, C386S349000
Reexamination Certificate
active
06763177
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a video edit system used in TV broadcast, more particularly to a non-linear video edit system using a digital data recorder that features random access and nonvolatile.
BACKGROUND ART
The videocassette recorder (VCR) has been used as a video edit system for a long time. The VCR uses a magnetic tape of sequential access as a recording medium so that in order to play a scene soon after it has been after recorded, it is necessary to wait for the tape to rewind. This prevents quick response. The sequential access and the slow record and play speeds also prevent the quick edit of the already recorded video.
On the other hand, as video compression and decompression technologies have developed, a non-linear video edit system using a recording medium that features fast and random access, such as a magnetic disk, or hard disk drive, has recently begun to be used.
The non-linear video edit system has an edit function called a time line which provides a cut edit by quickly cutting out and combining arbitrary scenes of the video data that has previously been digitized and stored into the disk from external VCRs or video lines. In this process, the cutting out of scenes does not process copies of the video data, but acquires address information identifying the scenes, that is, the start and end position information that points to the locations of the scenes within the video data on the hard disk drive. In the play of the edit result, the non-linear video edit system refers to the scene ID information for reading the corresponding video data contents from the disk to play it. Such video data of the cut scenes, sequentially aligned on the time line, is called a package. This is a very smart and easy way to carry out a cut edit on the video data that has been previously stored into the disk.
It is, however, necessary to be able to carry out edits rapidly in an application such as a news broadcast, so that there may be a request to create the package by the direct edit from the external VCR. In this case, the editor plays the scenes stored in the cassette loaded into the external VCR and records (digitizes) the video data into the disk so that a package comprising those scenes is created at the same time.
Even the non-linear video edit apparatus can not reduce the time for recording the scene that is to be stored. For example, recording a scene requiring three minutes to play requires three minutes to record. The video being recorded can be confirmed or viewed on a monitor in real time, i.e. while it is being recorded. But even if a portion of interest is found or the operator misses watching a portion of interest on the monitor, the portion concerned cannot be viewed until the scene recording finishes. Of course, it is possible to view this portion by suspending the VCR, but it is then necessary to record the whole scene over again even if the viewing shows no problem. On the contrary, if the portion of interest is not viewed during the recording, but viewed after the recording is complete and a problem is found, the recording must be done again from scratch and accordingly recording time has been wasted. In some applications, such as news editing, there is no time to be lost and wasting of recording time is a serious problem. This problem becomes worse as the scene is longer.
Therefore what is desired is to provide a non-linear video edit system that uses such a random access recorder and allows a recorded video portion to be viewed without awaiting completion of the recording and without interrupting the recording even during the recording from an external VCR.
DISCLOSURE OF INVENTION
A non-linear video edit system according to the present invention has a random access recorder for recording video data, read and write means for independently executing the write and the read of the video data into/from the random access recorder, a selector for selecting one from the play outputs of an external sequential access recorder and the random access recorder to provide it to an external monitor, and a control means for controlling the read and write means and the selector. When the edit system carries out an overwriting edit or an insertion edit of a played scene from the external sequential access recorder into a package of a plurality of scenes defined by a play list having data representing the start and end positions of each video scene already stored in the random access recorder in response to a first instruction provided by a user, the control means controls the selector to select the play output of the random access recorder following the play list and said played scene of the sequential access recorder to provide it to the monitor so that the user can view the edit result in real time during the writing, and if the user provides a second instruction during the writing, the control means stops the operation of displaying the edit result in real time without interrupting the writing and again provides the same edit result based on an updated temporary play list reflecting the edit result to the monitor from the random access recorder.
According to the present invention, the user can view the written video portion without awaiting completion of the writing and without interrupting the writing even during writing from the external VCR.
In accordance with another aspect of the present invention, a non-linear video edit system has a nonvolatile random access recorder for storing digitized video data, a writing means for writing the video data into the random access recorder, a reading means operating independently of the writing means, a control means for controlling an external sequential access recorder according to user instruction and controlling the writing means and the reading means, and a selecting means controlled by the control means and for selectively providing the play output of the sequential access recorder or the play output from the reading means of the random access recorder to an external monitor. As the play output of the sequential access recorder is written over or inserted into a video scene already stored in the random access recorder, when the control means receives the designation of the overwritten portion or range or the designation of the insertion point of the insertion and the overwriting or the inserted range of the play output from the sequential access recorder to the video scene so that the writing means writes the play output of the sequential access recorder into the random access recorder, it controls the sequential access recorder to start playing from a position at a predetermined time before the start point of said designated range while it controls the reading means of the random access recorder to start playing from a position at said predetermined time before said designated range or point, and controls the selecting means to select the play output of the reading means. After that, when-the play output of the sequential access recorder reaches the start point of the designated range, the control means controls the writing means to start writing the play output of the sequential access recorder as a new video scene different from the video scene stored in the random access recorder and controls the selecting means to select the play output of the sequential access recorder. Following that, when the play output of the sequential access recorder reaches the end point of the designated range, the control means controls the writing means to stop the writing and the selector to select again the play output of the reading means. After that, when the play output of the sequential access recorder reaches a position at a predetermined time after the end point of the designated range, the reading means stops reading and the control means creates a play list identifying the respective scenes resulting from overwriting or inserting said new video scene to the video scene stored in the random access recorder on the time axis by the start and the end point data of the corresponding video scene in the random access rec
Abe Koichi
Matsuura Koji
Okamoto Yasushi
Tsubouchi Shogo
Fried Harvey D.
Grass Valley Group Inc.
Kelley Chris
Levy Robert B.
Tripoli Joseph S.
LandOfFree
Non-linear video edit system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Non-linear video edit system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-linear video edit system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3204677