Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
1999-02-22
2002-08-06
Diep, Nhon (Department: 2613)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
C375S240020, C348S042000
Reexamination Certificate
active
06430224
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a stereo video data coding apparatus, or in particular, to a stereo video data coding apparatus for transmitting a motion vector and a predictive error of the stereo video data subjected to motion compensation through one channel and transmitting a motion vector, a parallax vector and a predictive error of the stereo video data subjected to motion compensation and parallax compensation through the other channel.
2. Description of the Related Art
An example of a conventional stereo video data coding apparatus will be explained with reference to the block diagram of FIG.
5
. The stereo video data coding apparatus comprises two coders for coding video data of left and right channels.
The coder for the left channel (or the basic channel) includes an original picture frame memory
11
for storing the original image, a subtractor
12
for generating a predictive error signal, an orthogonal transformer
13
for performing orthogonal transformation such as DCT transformation of the predictive error signal output from the subtractor
12
, a quantizer
14
for quantizing the data subjected to orthogonal transformation, and a variable length coder
15
for subjecting the quantized data to variable length coding. The coder further includes an inverse quantizer
16
for inversely quantizing the data quantized by the quantizer
14
, an inverse orthogonal transformer
17
, an adder
18
, a reproduced picture frame memory
19
for temporarily storing a reproduced picture, a motion compensator
20
for performing motion compensation with the original picture from the original picture frame memory
11
and the reproduced picture, and a predictive picture frame memory
21
.
The coder for the right channel (or the extended channel), on the other hand, includes component parts
31
to
40
and
42
similar to the coder for the left channel described above, except for a predictive mode selector
41
and a parallax compensator
43
. The reproduced picture from the reproduced picture frame memory
19
is applied to the parallax compensator
43
.
In this configuration, the left channel is coded based on the normal motion compensation and DCT. The right channel, on the other hand, is coded based on motion compensation or parallax compensation and DCT. Specifically, the prediction mode selector
41
selects the motion compensator
40
and the parallax compensator
43
, whichever is lower in predictive error, and connects to the predictive picture frame memory
42
. Other operations are similar to those for the left channel.
In the prior art described, however, the motion compensator
40
for the right channel has a configuration of the same size as the motion compensator
20
for the left channel, thereby posing the problem of the magnitude of the circuit size. The motion vector search of a particular macroblock, for example, is conducted in the range of ±128 pixels by ±32 lines. For realizing this with a LSI for motion detection which covers the range of ±8 pixels by ±8 lines, for example, 64 LSI chips are required.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a stereo video data motion vector coding apparatus which obviates the problems of the prior art described above and can detect motion vectors with small circuit size and high accuracy.
The first aspect of the invention lies in that a stereo video data coding apparatus comprises means for determining a macroblock on the basic channel corresponding to each macroblock constituting a unit of motion vector detection of the extended channel from the parallax vector between the two channels and acquiring a motion vector of said corresponding macroblock and means for determining the detection area of the motion vector of the macroblock constituting a unit of motion vector detection of said extended channel based on said acquired motion vector.
The second aspect of the invention lies in that a stereo video data coding apparatus comprises means for acquiring a motion vector of an adjacent macroblock for each macroblock constituting a unit of motion vector detection of the extended channel.
The third aspect of the invention lies in that a stereo video data coding apparatus comprises means for evaluating the utility of said acquired motion vectors and means for determining the detection area of the motion vector of the macroblock constituting a unit of motion vector detection of said extended channel based on a motion vector high in utility evaluation.
The fourth aspect of the invention lies in that the range of motion vector detection of a macroblock constituting a unit of motion vector detection of the extended channel is limited to the acquired motion vector described above, motion vectors high in evaluation or motion vectors in the neighborhood thereof.
According to the first to third aspects described above, a highly accurate motion vector can be used as a reference for determining the motion vector detection range of the macroblock of the extended channel. As a result, the range of motion vector detection can be reduced remarkably as compared with the prior art. Also, according to the fourth aspect, the motion vector detection range can be reduced to a very small area of ±8 pixels by ±8 lines, for example, around the macroblock corresponding to the acquired motion vector or the motion vector high in evaluation.
REFERENCES:
patent: 5619256 (1997-04-01), Haskell et al.
patent: 6111596 (2000-08-01), Haskell et al.
patent: 6160574 (2000-12-01), Oba et al.
Matsumoto Shuichi
Naito Sei
Diep Nhon
KDD Corporation
Westman Champlin & Kelly P.A.
LandOfFree
Stereo video data coding apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Stereo video data coding apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stereo video data coding apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2888178