Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1997-02-05
2001-08-28
Tran, Thai (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000
Reexamination Certificate
active
06282364
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a video signal recorder for recording video signals, a video signal regenerator for regenerating the recorded signals, an Image coding apparatus for compressing and recording image data from video signals by coding, and an image decoding apparatus for regenerating the coded and recorded image.
BACKGROUND OF THE INVENTION
Recently there have been developed various video signal recorder that code and compress video signals of digital data by a specified mode and perform a digital recording. It is, however, required much expense and labor for the standardization of compression modes and compressed algorithm hardware, e.g., LSI. In order to reduce the development costs for early development, it is preferable to apply a known standard and its corresponding accumulated techniques, a known hardware of compressed algorithms and the like. Hence there have been developed novel video signal recorders depending on the purpose.
For example, the mode employing
411
digital video signal in which the ratio of luminance signal, chrominance signal and another chrominance signal is 4:1:1, is widely used in general apparatuses for domestic use. While, depending on the purpose,
422
digital video signal containing more chrominance signal may be more preferable in terms of image quality and the like. There have been developed apparatuses that can treat
422
digital video signal by applying the standards and hardware of algorithms for
411
digital video signal.
FIGS.
13
(
a
) to
13
(
d
) are diagrams illustrating the construction of the signal. FIG.
13
(
a
) shows
411
digital video signals that is generally used. FIG.
13
(
b
) shows
422
digital video signal used when high image quality is required. In Figures, “Y” indicates luminance signal, “V” and “U” indicate chrominance signal.
In order to apply such apparatuses as developed in the standard for
411
digital video signal to
422
digital signal, the following processing is performed. That is,
422
digital video signal as shown in FIG.
13
(
b
) are split into
211
digital video signal, which signal are then appended with dummy signal to create pseudo-
411
digital signal as shown in FIG.
13
(
d
), followed by necessary processing. The signal shown in FIG.
13
(
d
) has the same format as that of FIG.
13
(
a
), allowing to apply the apparatus with the standard for
411
digital video signal. The two split signals are to be synthesized when recording or regenerating.
A description will be given of a conventional video signal recorder and a video signal regenerator, each treating
422
digital signal as described.
Referring to FIG.
12
(
a
), there is shown the construction of the conventional video signal recorder. A video signal splitter
1001
splits
422
digital video signal with luminance signal to chrominance signal ratio of 4:2:2 into two
211
digital video signals with that ratio of 2:1:1, based on a specified split format. A video signal converter
1002
adds a specified dummy signal into the luminance signal in the input
211
digital video signal to convert it into
411
digital video signal with the luminance signal to chrominance signal ratio of 4:1:1. A high-efficiency coding apparatus
1003
performs a specified high-efficiency coding of the input
411
digital video signal to create compressed data. An error correction coding apparatus
1004
appends a specified error correction coded data to the compressed data. A recorder
1005
records the output of the error correction coding apparatus
1004
in a recording media
1006
, e.g., tape media such as VTRs, disk media such as optical disks. In the recording media
1006
, digitized data is recorded for the retention.
The video signal recorder so constructed will perform the aforesaid compression, coding and recording as follows. The video signal splitter
1001
abolishes, from the input video signal, portions other than a significant area as a processing object, and then splits
422
digital video signal with the luminance signal to chrominance signal ratio of 4:2:2, into two
211
digital video signal with that ratio of 2:1:1, based on a specified split format. The two split
211
digital video signal are separately input into either of the two video signal converters
1002
.
Each video signal converter
1002
appends a specified dummy signal to the luminance signal in the input
211
digital video signal, to convert it into
411
digital video signal with the luminance signal to chrominance signal ratio of 4:1:1. The data of the
211
digital video signal is sequenced in this order: luminance signal (Y), luminance signal (Y), chrominance signal (V), and chrominance signal (U), as shown in FIG.
13
(
c
). The above data is then converted into
411
digital video signal with the sequencing of the luminance signal (Y), dummy signal (D), the luminance signal (Y), dummy signal (D), the chrominance signal (V), and the chrominance signal (U), as shown in FIG.
13
(
d
). All the dummy signal (D) are identical data. Each video signal converter outputs the converted
411
digital video signal to the high-efficiency coder
1003
.
Each coder
1003
performs a high-efficiency coding of the input
411
digital video signal by employing a specified high-efficiency coding a algorithm, and then outputs it as compressed data.
Referring to FIGS.
14
(
a
) and
14
(
b
), the format of the compressed data will be exemplified. The coder
1003
inherently performs a high-efficiency coding of
411
digital video signal by the algorithm utilizing DCT (discrete cosine transform). A DCT block consists of 8×8 pixels. A macro block consists of four DCT blocks of luminance signal (Y), one DCT block of chrominance signal (V) and one DCT block of chrominance signal (U). The compressed data of this macro block is sequenced as shown in FIG.
14
(
a
). The sequence of each DCT block is first DC components, then additional information data, and AC components.
In this example, since there is employed pseudo-
411
digital signal based on
422
digital signal, the sequence of the DCT block is as shown in FIG.
14
(
b
), and that of the block of the dummy signal (D) is first a specified DC components, then additional data and finally EOB (end of block).
Each coder
1003
outputs such compressed data as shown in FIG.
14
(
b
) to the error correction coder
1004
. Each coder
1004
appends error correction codes to the input compressed data by a specified mode to obtain the error correction coded data, and outputs it.
The recorder
1005
records the error correction coded data in a specified position of a specified recording media
1006
. Thus, the conventional video signal recorder codes/compresses
422
digital video signal and then records it.
It is noted that the video signal recorder may have two recorders
1005
which separately write in the recording media
1006
, as shown in FIG.
12
(
a
), or may have a synthesizer
1007
that synthesizes two output results and then write in the recording media
1006
. The operation of the latter is the same as that of the former, except the synthesize and the writing.
Referring to
FIG. 15
, there is shown the construction of a conventional video signal recorder, in which video data as recorded in the above manner is regenerated to obtain videos. A recording media
1006
is to be recorded video data (error correction coded data) in the conventional video signal recorder, as previously described. A regenerator
2001
regenerates the error correction coded data from the recording media
1006
. An error correction decoder
2002
performs the error corrections based on the error correction codes added in the video signal recorder to obtain compressed data, and then outputs it. A high-efficiency decoder
2003
performs the reverse conversion of the high-efficiency coding performed by the video signal recorder to decode digital video signal. A video signal separator
2004
separates the dummy signal added in the video signal recorder out of
411
digital video signal (luminance signal to chrominance signal r
Fujiwara Yuji
Juri Tatsuro
Nishino Masakazu
Takeuchi Seiichi
Matsushita Electric - Industrial Co., Ltd.
Parkhurst & Wendel L.L.P.
Tran Thai
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