Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Patent
1996-09-18
1998-11-24
Tran, Thai
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
386 40, 386 45, 386112, H04N 576, H04N 592
Patent
active
058419365
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention elates to a picture data recording device in which picture data for one picture is split into plural picture regions and compressed for being recorded on a recording medium, and a picture reproducing device in which the picture data are reproduced from a recording medium on which the picture data have been recorded by the data recording device. The present invention is applied to e.g. a picture filing system for recording encoded (compressed) still picture data on a disc-shaped recording medium, such as a magneto-optical disc.
BACKGROUND ART
There has so far been known a magneto-optical disc recording device for recording still picture data supplied from outside on a magneto-optical disc.
With the magneto-optical disc recording device, picture data supplied thereto are blocked on the encoding unit basis. The picture data are encoded on the block basis and supplied to a photomagnetic recording circuit. The photomagnetic recording circuit detects vacant areas of the magneto-optical disc under control of a central processing unit (CPU) which controls the photomagnetic recording circuit for recording the encoded still picture data in the vacant areas in terms of pre-set recording units, such as clusters, as recording units.
If, in the picture filing system recording still picture data, such as data of documents or maps, on a recording medium, each picture is split into plural partial picture regions for management purposes There has been known a method of divisionally managing a picture represented in multi-value data. such as a car navigation system, or a method of divisionally managing a non-compressed (non-encoded) picture, such as a map picture.
As the method for compressing still picture data, there is known a joint photographic coding experts group (JPEG) system which exploits the discrete cosine transform (DCT).
If, with a picture filing system exploiting the block-based non-reversible compression, accompanied by distortion, a full picture is divided into plural partial picture regions for management purposes, distortions are incurred at a boundary portion, thus deteriorating the picture quality of the synthesized picture.
In view of the above-described problems of the prior art, the present invention envisages to provide a picture data recording device and a picture data reproducing device whereby divisional picture management may be achieved without producing boundary distortion.
DISCLOSURE OF THE INVENTION
A picture data recording device according to the present invention includes picture data recording means for storing one-picture input picture data, encoding means for dividing the picture data into blocks and encoding the resulting blocks, division means for dividing the one-picture input picture data stored in said picture data storage means into a plurality of partial picture regions each sized to be an integer number times a minimum sized block unit in said encoding means, further dividing a partial picture region based picture data into said minimum sized block units and supplying the resulting minimum sized blocks to said encoding unit, recording means for recording encoded picture data encoded by said encoding means on the recording medium on the partial picture region basis, and control mans for controlling the operation of the above means.
With the picture data recording device of the present invention, the division means operates so that, when the size of a picture is indivisible by the size of the partial picture region, dummy pixels are used in order to change the shape of the picture to a picture shape divisible by the partial picture region, one-picture input picture data stored in the picture data storage means are divided into plural partial picture regions each sized to be an integer number times a minimum size block in the encoding means and wherein the partial picture region based picture data is divided in terms of the minimum size blocks as units and supplied in this form to the encoding means.
With the picture data recording device of the
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Maioli Jay H.
Sony Corporation
Tran Thai
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