EP0570818A2
Expired / Lapsed
EP
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Apparatus for and method of transmitting video signal
Assignee: Sony Corp
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Filing: 1993-05-11
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Granted: —
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Expires: 2013-05-11
Abstract
Abstract The video signal containing portions locally unsuitable for coding is divided into a plurality of components (Y,C R ,C B ) and is coded by a method such as a Wavelet transform and then is transmitted. In this case, a first quantizing means (32) controls a quantization characteristic per block consisting of small area segments of coefficients composed of respective components to make uniform a distortion within the picture and a visual obstacle caused by the distortion. A second quantizing means (34) controls the quantization characteristic to make uniform a deterioration quantity of the entire picture within a range of a predetermined coded data quantity. It is therefore possible to effect the transmission with a stable picture quality against a variety of fluctuations in the video signal inputted.
Inventors
- 👤 Yuichi c/o Sony Corporation Kojima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 20:47
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/80; H04N9/804; H04N9/8042; H04N9/8047; H04N11/00; H04N11/04; H04N11/042; H04N11/044; H04N19/00; H04N19/10; H04N19/102; H04N19/124; H04N19/126; H04N19/129; H04N19/134; H04N19/154; H04N19/169; H04N19/17; H04N19/172; H04N19/176; H04N19/186; H04N19/60; H04N19/63; H04N19/64; H04N19/645; H04N19/115; H04N19/146
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
129 words
An apparatus for transmitting a video signal, comprising: a dividing means (11) for recursively dividing only a low frequency channel of an input video signal into a plurality of components; a blocking means (31) for constructing a plurality of blocks corresponding to small area segments of said input video signal from coefficients each belonging to each of said plurality of blocks; a first quantizing means (32) for effecting a first quantization for each of said plurality of blocks; a second quantizing means (34) for effecting a second quantization for each of said plurality of components with respect to a first quantization coefficient obtained through said first quantizing means (32); and a variable length coding means (35) for variable-length-coding a second quantization coefficient obtained through said second quantizing means (34).
Claim 2
Dependent Claim
77 words
The apparatus for transmitting a video signal (S1) according to claim 1, wherein: said input video signal consists of a plurality of component signals each having a different sampling frequency; said blocking means (31) forms said plurality of blocks to equalize areas of said small area segments of said input video signal (S1) that correspond to said plurality of component signals; and said first quantizing means (32) sets said first quantization accuracy for each of said blocks.
Claim 3
Dependent Claim
107 words
The apparatus for transmitting a video signal according to claim 1, wherein: said input video signal (S1) consists of a plurality of component signals each having a different sampling frequency; said blocking means (31) forms said plurality of blocks to equalize areas of small area segments of said input video signal (S1) that correspond to said plurality of component signals and at the same time constructs a macro block from said plurality of blocks in which the small area segments of said input video signal (S1) are coincident with each other; and said first quantizing means (32) sets a quantization accuracy en bloc per said macro block.
Claim 4
Independent Claim
66 words
The apparatus for transmitting a video signal according to any of claims 1 to 3, further comprising: a quantization control means (36, 37) for sequentially setting an accuracy of said second quantization of the next stage from an accumulative coded data quantity with reference to said accumulative coded data quantity every time when said variable length coding for each of said plurality of components is ended.
Claim 5
Dependent Claim
99 words
The apparatus for transmitting a video signal according to claim 4, further comprising: a rearranging means (33) provided between said first quantizing means (32) and said second quantizing means (34), and for sequentially rearranging channels of said input signal (S1) from a low frequency channel and effecting an output thereof; and a transmission stopping control means for stopping to transmit said plurality of components which are being processed when said cumulative coded data quantity exceeds a predetermined coded data quantity before all of said plurality of components undergo both said second quantization and variable length coding to be transmitted.
Claim 6
Dependent Claim
60 words
The apparatus for transmitting a video signal according to claim 5, wherein: said rearranging means (33) is composed of a memory which reads one of input coefficients of said second quantizing means (34) and inputs said one of coefficient to said second quantizing means (34), when processing of one of output coefficients for said second quantizing means (34) is terminated.
Claim 7
Independent Claim
48 words
The apparatus for transmitting a video signal according to any of claims 1 to 6, wherein: said dividing means (11) performs the Wavelet transform on said input video signal (S1) and recursively divides only a low frequency channel of said input video signal into a plurality of components.
Claim 8
Dependent Claim
127 words
A video signal transmitting method, comprising the step of: recursively dividing only a low frequency channel of an input video signal (S1); forming a plurality of blocks (A i , B i , C i ) corresponding to small area segments of said input video signal (S1) with coefficients each belonging to each of said plurality of components (Y, C R , C B ); effecting a first quantization per said block (A i , B i , C i ); effecting a second quantization for each of said plurality of components (Y,C R ,C B ) with respect to a first quantization coefficient obtained by said first quantization; and effecting a variable length coding with respect to a second quantization coefficient obtained by said second quantization.
Claim 9
Dependent Claim
103 words
The video signal transmitting method according to claim 8, wherein: said input video signal (S1) consists of a plurality of component signals (Y,C R ,C B ) each having a different sampling frequency, and said plurality of blocks (A i , B i , C i ) are formed so that sizes of said small area segments of said input video signal (S1) that correspond to said plurality of component signals (Y, C R , C B ) are equal; and an accuracy of said first quantization is set en bloc per said block (A i , B i , C i ).
Claim 10
Dependent Claim
127 words
The video signal transmitting method according to claim 8, wherein: said input video signal consists of a plurality of component signals (Y,C R ,C B ) each having a different sampling frequency, and said plurality of blocks (A i , B i , C i ) are formed so that sizes of small area segments of said input video signal (S1) correspond to said plurality of component signals (Y,C R ,C B ) are equal; a macro block is formed to include said plurality of blocks (A i , B i , C i ) in which the small area segments of said input video signal (S1) are coincident with each other; and an accuracy of said first quantization is set en bloc per said macro block.
Claim 11
Dependent Claim
110 words
The video signal transmitting method according to any of claims 8 to 10, wherein: a coded data quantity allocated to a fixed amount of input video signals (S1) is previously set; when said second quantization and variable length coding are effected on a first quantization coefficient for each of said plurality of components (Y,C R ,C B ), an accumulative coded data quantity is referred every time which said second quantization and variable length coding with respect to said plurality of components (Y,C R ,C B ) are terminated; and said second quantization accuracy of the next stage is sequentially set on the basis of said accumulative coded data quantity.
Claim 12
Dependent Claim
68 words
The video signal transmitting method according to claim 11, wherein: said processing is performed sequentially from a low frequency channel having a higher significance, and then, when exceeding a predetermined coded data quantity before all of said plurality of components (Y,C R ,C B ) undergo said second quantization and variable length coding so as to transmit, the transmission of said under-processing components having lower significance is stopped.
Claim 13
Dependent Claim
59 words
The video signal transmitting method according to claim 12, wherein: a first quantization coefficient obtained by said first quantization is stored into a memory (33); and when processing of one of output coefficients for said second quantization is terminated, one of input coefficients to said second quantizing means is read from said memory (33) after making a predetermined rearrangement.
Claim 14
Dependent Claim
25 words
The video signal transmitting method according to any of claims 8 to 13, wherein: said input video signal (S1) is divided by a Wavelet transform.
Claim 15
Dependent Claim
139 words
A video signal transmitting apparatus for decoding and transmitting a coded video data, comprising: a variable length decoding means (42) for variable-length-decoding said coded data in said transmission data; a first inverse quantizing means (43) for inverse-quantizing an output of said variable length decoding means on the basis of said first quantization control signal (S32) and outputting a first inverse quantization coefficient; a second inverse quantizing means (45) for inverse-quantizing said first inverse quantization coefficient on the basis of said first inverse quantization coefficient on the basis of said second quantization control signal (S31) and outputting a second inverse quantization coefficient; a first rearranging means (46) for rearranging said second inverse quantization coefficient according to a plurality of components; and a reconstructing means (26) for reconstructing said video signal from a decoding coefficient divided into said plurality of components.
Claim 16
Dependent Claim
42 words
The video signal transmitting apparatus according to claim 15, further comprising: a second rearranging means (44) provided between said (43) first and second (45) inverse quantizing means, said second rearranging means (44) rearranging said first inverse quantization coefficients in a predetermined array.
Claim 17
Dependent Claim
30 words
The video signal transmitting apparatus according to claims 15 or 16, wherein: said first inverse quantizing means (43) performs predetermined weighing on the basis of said first quantization control signal.
Claim 18
Dependent Claim
43 words
The video signal transmitting apparatus according to any of claims 15 to 17, wherein: said reconstructing means (26) reconstructs said video signal from said decoding coefficient divided into said plurality of components (Y,C R ,C B ) by effecting an inverse Wavelet transform.
Claim 19
Dependent Claim
127 words
A video signal transmitting method for decoding and transmitting a coded video data, comprising the steps of: variable-length-decoding said coded video data (SD30) in said transmission data; effecting a first inverse quantization on the basis of said first quantization control signal (S32) with respect to a decoded coefficient which has been variable-length-decoded; performing a second inverse quantization of a first inverse quantization coefficient obtained by said first inverse quantization effected on the basis of said second quantization control signal (S31); making a first rearrangement to rearrange second inverse quantization coefficients obtained by said second inverse quantization according to said plurality of components (Y,C R ,C B ); and reconstructing said video signal from decoded coefficients rearranged according to said plurality of components (Y,C R ,C B ).
Claim 20
Dependent Claim
33 words
The video signal transmitting method according to claim 19, wherein: a second rearrangement is effected to rearrange said first inverse quantization coefficients in a predetermined array between said first and second inverse quantizations.
Claim 21
Dependent Claim
29 words
The video signal transmitting method according claims 19 or 20, wherein: said first inverse quantization effects a predetermined weighting processing on the basis of said first quantizing control signals.
Claim 22
Dependent Claim
42 words
The video signal transmitting method according to any of claims 19 to 21, wherein: said reconstruction is to reconstruct said video signal from said decoding coefficient divided into said plurality of components (Y,C R ,C B ) by said inverse Wavelet transform.
References Cited (Backward Citations)
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