Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Patent
1996-12-13
1999-05-04
Chevalier, Robert
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
386117, 386109, H04N 591, H04N 5225
Patent
active
058995757
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an apparatus for capturing, recording and playing input motion pictures and particularly to an apparatus for playing motion pictures from a free scene (position).
BACKGROUND TECHNIQUE
A conventional video recording/playing apparatus has such a configuration as shown in FIG. 10.
As shown in FIG. 10, the video recording/playing apparatus comprises an information processing system 21, and a video input device 22. The video input device 22 is means for inputting analog motion pictures and is carried out in a video camera, a video tape recorder (VTR), a television set, or the like. The case of a video camera is shown here as an example. The information processing system 21 is a system for recording motion pictures inputted through the video input device 22 and has a means for digitizing analog motion pictures inputted through the video input device 22, and a means for recording the motion pictures digitized by the digitizing means.
The outline of processing in the conventional video recording/playing apparatus having the configuration shown in FIG. 10 will be described below with reference to FIG. 11.
FIG. 11 is a flow chart of processing for specifying scene-changed points with respect to a series of continuous still images (motion pictures) inputted through the video input device 22, for example, for the purpose of head-review playing.
In the processing, capturing motion pictures is first started (step 501) and a one-frame's or one-field's analog still image inputted through the video input device 22 is digitized (step 502). The motion pictures inputted here through the video input device 22 have a standardized format such as NTSC, PAL or SECAM.
In the aforementioned processing, the digitized still image is then stored in a main storage device contained in the information processing system 21 (step 503). The still image is then compared with a still image stored just before the still image (step 504) and a judgment is made as to whether there is any scene change or not (step 505). In this occasion, the judgment as to whether there is any scene change or not is performed by comparing two still images pixel by pixel, calculating differences between pixels and calculating the sum of differences between all pixels. When, for example, the sum exceeds an arbitrary threshold, it is judged that there is some scene change.
When it is judged in the step 505 that there is some scene change, the point of time counted from the start of the capturing of motion pictures is stored in the main storage device (step 506). A judgment is then made as to whether the capture is completed or not (step 507) and, if the capture is not completed, the situation of the routine goes back to the step 502 to repeat the processing. If the capture is completed, a series of non-compressed motion pictures is stored in an auxiliary storage device contained in the information processing system 21 (step 508) and the processing is terminated.
The aforementioned conventional video recording/playing apparatus then displays a list of still images of the scene-changed positions on a display device contained in the information processing system 21, extracts the point of time stored in the main storage device in the step 506 and corresponding to an arbitrary still image designated from the displayed list by a user through an input device contained in the information processing system 21 and plays a series of motion pictures stored in the auxiliary storage device in the step 508 so that the head-review playing of the series of motion pictures is started from a still image (position) corresponding to the point of time.
A technique in which the change of a scene in motion pictures is extracted automatically so that the motion pictures inclusive of the scene-changed information are encoded, has been disclosed in JP-A-6-133305.
A technique for real-time displaying motion pictures on a display device, or the like, has been described in the magazine "Interface", April issue, pp.102-109, 1996, published by CQ
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patent: 5539455 (1996-07-01), Makioka
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* "Illustrated Up-to-date MPEG Textbook", pp. 28-29, Multimedia Communication Research Group, ASCII Corp.
* "Illustrated Up-to-date MPEG Textbook", pp. 89-165, Multimedia Communication Research Group, ASCII Corp.
* "Interface", pp. 102-109, Apr. 1996, CQ Publishing Co.
Harada Yoshihiro
Katoh Kazutoshi
Kohiyama Tomohisa
Kondo Nobukazu
Okayama Masataka
Chevalier Robert
Hitachi , Ltd.
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