Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1998-02-17
2001-07-03
Nguyen, Huy (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000
Reexamination Certificate
active
06256449
ABSTRACT:
FIELD OF THE ART
The present invention relates to an image encoder and an image decoder and, for example, is suitably applied to an image encoder and an image decoder in an image transmission system which after a composite video signal is converted into component video signals, they are compressively coded and delivered to transmission means and moreover the coded video signal obtained from the transmission means is restored to a composite video signal after decoded.
BACKGROUND ART
Conventionally, there is a record/play system (image transmission system) called server which, for example, by selecting a predetermined input terminal from a plurality of input terminals, inputs and records a video signal from the desired video source and simultaneously reproduces it if necessary, selects the desired output terminal from a plurality of output terminals for the output of a reproduced image.
In this system, a composite video signal is converted into the predetermined signal format on the input side, recorded in compressed codes into a record/play apparatus and simultaneously data reproduced from the record/play apparatus are outputted after decoded and then restored in a composite video signal on the input side.
Meanwhile, in a record/play system of such an arrangement, the color frame information obtained in the Y/C separation of the composite signal inputted is lost (changes) in the process of compressive encoding processing and is not conserved in the processing of a record/play system. As a result, in returning the video signal reproduced from the record/play apparatus to a composite signal, there was a problem that no chroma modulation based on the color frame information is performed and consequently the resolution of a reproduced image and so on are deteriorated, thus the deterioration of images is inevitable.
DISCLOSURE OF INVENTION
Made in consideration of these problems, the present invention has an object of proposing an image encoder and an image decoder in an image transmission system enabling the deterioration of decoded images to be avoided.
To solve such problems, the present invention extracts the color frame information previously added to said input video signal prior to said compressive encoding and adds the color frame information extracted to the compressed video signal after said compressive encoding.
Besides, the present invention extracts the color frame information added to the compressed video signal prior to the decoding and adds the color frame information extracted to the decoded video signal after the decoding.
According to the present invention, color frame information is transmitted via the compressive encoding and decoding, so that chroma modulation can be made in accordance with the color frame information in converting the decoded video signal into a composite video signal, thereby enabling the deterioration of images to be avoided.
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Frommer William S.
Frommer Lawrence & Haug LLP.
Nguyen Huy
Shallenburger Joe H.
Sony Corporation
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