JP2001094997A - Data transmission rate controller adaptive to network bandwidth - Google Patents

Data transmission rate controller adaptive to network bandwidth

Info

Publication number
JP2001094997A
JP2001094997A JP2000246481A JP2000246481A JP2001094997A JP 2001094997 A JP2001094997 A JP 2001094997A JP 2000246481 A JP2000246481 A JP 2000246481A JP 2000246481 A JP2000246481 A JP 2000246481A JP 2001094997 A JP2001094997 A JP 2001094997A
Authority
JP
Japan
Prior art keywords
data
video data
complexity
video
network
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2000246481A
Other languages
Japanese (ja)
Inventor
Sodo Boku
相度 朴
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of JP2001094997A publication Critical patent/JP2001094997A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/164Feedback from the receiver or from the transmission channel
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/146Data rate or code amount at the encoder output
    • H04N19/152Data rate or code amount at the encoder output by measuring the fullness of the transmission buffer
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/177Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a group of pictures [GOP]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/61Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams

Abstract

PROBLEM TO BE SOLVED: To provide a transmission rate controller for video data adaptive a network bandwidth that makes temporal changes. SOLUTION: This transmission rate device that controls a transmission rate of video data in a data network providing bandwidth information is provided with a video compression means, that quantizes received video data according to a prescribed quantized value to compress the video data, a transmission means that buffers the compressed video data produced from the video compression means to transmit the buffered data to the network, a complexity prediction means that predicts the level of complexity of the video data to be coded from the received video data, and a control means that decides the quantization value of the video compression means, on the basis of the quantity of the data buffered by the transmission means, the level of complexity predicted by the complexity level prediction device and the bandwidth provided from the network and adjusts the quantization value, so that the quantity of the data buffered within the range of the bandwidth matches with a predetermined target value.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は映像伝送システムで
効率的な映像データ伝送率制御装置に係り、特に時間的
に変化するネットワーク帯域幅に適応的な映像データの
伝送率制御装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an efficient video data rate control apparatus in a video transmission system, and more particularly to a video data rate control apparatus adapted to a time-varying network bandwidth.

【0002】[0002]

【従来の技術】一般に映像符号化器は、映像を伝送する
時その映像の画質低下を最小化しながら同時に帯域幅の
利用度を最大にするように符号化されるべきである。こ
のような映像符号化器で伝送率制御に関した技術は、
“ISO/IEC MPEG working group”で制定した“標準ISO/
IEC13818-2:ビデオ”に“TEST model-5(以下TM−
5)”部分に述べられている。
2. Description of the Related Art In general, a video encoder should be coded so as to maximize the utilization of bandwidth while minimizing image quality degradation when transmitting the video. The technology related to the transmission rate control in such a video encoder is as follows.
"Standard ISO /" established by "ISO / IEC MPEG working group"
IEC13818-2: Video "and" TEST model-5 (hereinafter TM-
5) "section.

【0003】このようなMPEG WGで提示するTM
−5は、基本的にCBR(Costant Bit Rate)の映像シ
ーケンスを生成するものであって、一つのGOP(Grou
p ofPicture)ごとに伝送できるデータ量を割り当てて
各場面ごとにこれを再び分配している。TM−5のアル
ゴリズムは、先ず各場面が伝送できるデータ量から目標
データの大きさを設定した後、仮想バッファの占有量に
従って量子化値の基準を定める。この時目標データの大
きさは、映像の特性と固定されたネットワーク帯域幅を
基準として決まる。TM−5では一つの場面に複数個の
量子化値が使われるので量子化値を基準として定め、各
々のマクロブロックごとに異なる量子化値を使用する。
[0003] The TM presented by such MPEG WG
-5 basically generates a video sequence of CBR (Costant Bit Rate), and one GOP (Grou
The amount of data that can be transmitted is allocated for each p of Picture, and is distributed again for each scene. In the TM-5 algorithm, first, the size of target data is set based on the amount of data that can be transmitted in each scene, and then the standard of the quantization value is determined according to the occupancy of the virtual buffer. At this time, the size of the target data is determined based on the characteristics of the image and the fixed network bandwidth. In TM-5, since a plurality of quantization values are used in one scene, the quantization value is determined as a reference, and a different quantization value is used for each macroblock.

【0004】従って、このようなTM−5では、映像の
品質を保持しながらCBRのチャンネルに映像データを
伝送するのに有用に使われうる。しかし、TM−5では
場面の変化に従って誤った演算により外れた帯域幅が割
当てられうる。即ち、GOP基準で映像データの目標デ
ータの大きさを決定する場合、外れた帯域幅割当が長期
間持続してデータ損失が持続する可能性が大きい。ま
た、PSTNとは違ってデータ網では、一つのデータ伝
送パスを多数のエンドユーザー(end-user)で使用する
ために、一つのエンドユーザーの伝送量変化によって各
ネットワークエンドユーザーが有することができる帯域
幅の大きさが変化する。
Accordingly, such a TM-5 can be effectively used for transmitting video data to a CBR channel while maintaining video quality. However, in TM-5, a deviated bandwidth may be allocated due to an erroneous operation according to a change in a scene. That is, when the size of the target data of the video data is determined based on the GOP, there is a high possibility that the out-of-bandwidth allocation is maintained for a long time and the data loss is continued. Also, unlike the PSTN, in a data network, since one data transmission path is used by many end-users, each network end-user can have one end-user according to a change in transmission volume. The magnitude of the bandwidth changes.

【0005】従って、TM−5は、時変ネットワーク環
境で映像データを伝送する場合、やむを得ず映像データ
の損失が発生し、これによりQoS(Quality of Servi
ce)が低下するのでVBR(Variable Bit Rate)の環
境で利用できない問題点がある。
[0005] Therefore, when transmitting video data in a time-varying network environment, the TM-5 inevitably loses the video data, thereby causing a QoS (Quality of Service).
ce) is reduced and cannot be used in a VBR (Variable Bit Rate) environment.

【0006】[0006]

【発明が解決しようとする課題】本発明が解決しようと
する技術的課題は、データ網を用いる映像伝送システム
で映像を圧縮して伝送することにおいて、ネットワーク
帯域幅状態に従って量子化値を調節できる映像データ伝
送率制御装置を提供することにある。
A technical problem to be solved by the present invention is to control a quantization value according to a network bandwidth state in compressing and transmitting an image in an image transmission system using a data network. An object of the present invention is to provide a video data transmission rate control device.

【0007】[0007]

【課題を解決するための手段】前記の技術的課題を解決
するために、本発明は帯域幅情報を提供するデータネッ
トワークで映像データの伝送率を制御する伝送率装置に
おいて、入力される映像データを所定の量子化値で量子
化して圧縮する映像圧縮手段と、前記映像圧縮手段から
発生する圧縮された映像データをバッファリングして前
記ネットワークに伝送する伝送手段と、入力される映像
データから符号化する映像データの複雑度を予測する複
雑度予測手段と、前記伝送手段でバッファリングされた
データ量と前記複雑度予測器で予測された複雑度と前記
ネットワークから提供された帯域幅に基づいて前記映像
圧縮手段の量子化値を決定し、前記帯域幅範囲内で前記
バッファリングされたデータ量をあらかじめ決まった目
標値に一致させるように前記量子化値を調節する制御手
段とを含む映像伝送率制御装置を提供する。
SUMMARY OF THE INVENTION In order to solve the above technical problem, the present invention relates to a transmission rate control apparatus for controlling a transmission rate of video data in a data network for providing bandwidth information. Video compression means for quantizing and compressing the video data with a predetermined quantization value, transmission means for buffering compressed video data generated from the video compression means and transmitting the video data to the network, Complexity prediction means for predicting the complexity of video data to be converted, based on the amount of data buffered in the transmission means, the complexity predicted by the complexity predictor, and the bandwidth provided from the network Determining a quantization value of the video compression means, and matching the buffered data amount within the bandwidth range with a predetermined target value Providing video rate control device and a control means for adjusting the urchin the quantized value.

【0008】[0008]

【発明の実施の形態】以下、添付した図面を参照して本
発明の望ましい実施形態を説明する。図1は、本発明が
適用されるMPEG符号化器のブロック図である。先
ず、入力される映像データはGOP(Group of Pictur
e)単位で構成され、I(Intra)フレーム、P(Predic
tive)フレーム、B(Bidirectional)フレームで符号
化される。Iフレーム、Pフレーム、Bフレームはパタ
ーン設定に従って選択的にDCT器120に入力され
る。DCT器120は、選択的に入力されるI、P、B
フレームから空間重複性を得るために8×8ブロックに
対してDCT(Discrete Cosine Transform)を遂行す
る。量子化器(Q)130はDCT器120でDCTさ
れた映像データの空間重複性を除去する。逆量子化器1
50は量子化器130で量子化された映像データを逆量
子化する。IDCT160は逆量子化器150で逆量子
化された映像データを逆DCTする。フレームメモリ
(FM)170はIDCT器160で逆DCTされた映
像データをフレーム単位で貯蔵する。動き推定器(M
E)180は、入力される現在フレームの映像データと
フレームメモリ170に貯蔵された以前フレームの映像
データを用いて動きベクトルMVを発生する。VLC
(Variable Length Coding)140は動き推定器180
で発生する動きベクトルMVに従って量子化された映像
データで統計的重複性を除去する。従って、図1のMP
EG符号化器を用いて時変ネットワークで映像データを
伝送するために、量子化器130の量子化値は予測され
た複雑度、バッファで占有されたデータ量に基づいてネ
ットワークの帯域幅内で適当に選択されて可能なデータ
損失を最小にし、同時に帯域幅の利用度を最大にすべき
である。
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram of an MPEG encoder to which the present invention is applied. First, the input video data is a GOP (Group of Pictur).
e) unit, I (Intra) frame, P (Predic
tive) frame and B (Bidirectional) frame. The I frame, the P frame, and the B frame are selectively input to the DCT unit 120 according to the pattern setting. The DCT unit 120 selectively inputs I, P, and B
DCT (Discrete Cosine Transform) is performed on 8 × 8 blocks to obtain spatial redundancy from the frame. The quantizer (Q) 130 removes the spatial redundancy of the video data DCT processed by the DCT 120. Inverse quantizer 1
50 dequantizes the video data quantized by the quantizer 130. The IDCT 160 performs inverse DCT on the video data dequantized by the dequantizer 150. A frame memory (FM) 170 stores the image data inversely DCT-processed by the IDCT unit 160 in frame units. Motion estimator (M
E) 180 generates a motion vector MV using the input video data of the current frame and the video data of the previous frame stored in the frame memory 170. VLC
(Variable Length Coding) 140 is a motion estimator 180
Removes statistical redundancy from the video data quantized according to the motion vector MV generated in step (1). Therefore, the MP of FIG.
In order to transmit video data over a time-varying network using an EG encoder, the quantized value of the quantizer 130 is determined within the network bandwidth based on the predicted complexity and the amount of data occupied by the buffer. Properly selected should minimize possible data loss while maximizing bandwidth utilization.

【0009】図2は、図1の装置を適用したデータ伝送
率制御装置のブロック図である。先ず、複雑度予測器2
50は、n番目フレームの映像データを圧縮するために
n番目フレームの映像データに対する複雑度を予測す
る。即ち、再生される映像データは同一であったり、類
似のフレームが数〜数十秒間持続する特性を有するの
で、現在フレームの映像データは、以前フレームの映像
データと特性が似ていることと予測し、一フレームの複
雑度は、以前Nケフレームの複雑度を平均することによ
って予測される。また複雑度予測器250は、フレーム
モードI、P、Bに従う複雑度変化をなくし、映像デー
タ固有の複雑度変化だけを検出するために、以前フレー
ムの特性を平均した値を用いる。従って、複雑度予測器
250は、N個のメモリ領域をおいて、以前フレームの
複雑度推移を記録すべきである。ここで複雑度予測器2
50でn番目フレームの複雑度予測値の平均M
[n](符号「M^」は、符号「M」の上に符
号「」及び「^」が二重に重なっているものを示す)
は数学式2のように示すことができる。
FIG. 2 is a block diagram of a data rate control device to which the device of FIG. 1 is applied. First, the complexity predictor 2
50 predicts the complexity of the video data of the nth frame in order to compress the video data of the nth frame. That is, since the video data to be reproduced has the characteristic that the same or similar frames last for several to several tens of seconds, the video data of the current frame is predicted to have similar characteristics to the video data of the previous frame. However, the complexity of one frame is predicted by averaging the complexity of the previous N frames. Further, the complexity predictor 250 uses a value obtained by averaging the characteristics of the previous frame in order to eliminate a change in complexity according to the frame modes I, P, and B and to detect only a change in complexity unique to video data. Therefore, the complexity predictor 250 should record the transition of the complexity of the previous frame in N memory areas. Where the complexity predictor 2
The average M ~ of the complexity of the predicted value of the n-th frame in 50 ^
[N] (The symbol “M to ^” indicates that the symbol “ ” and the symbol “^” double overlap on the symbol “M”)
Can be expressed as in Equation 2.

【0010】[0010]

【数2】 ここで、M(i): 複雑度(Complexity)、 N: GOP単位でのフレーム個数、 n: フレーム個数である。この時M(i)はR(i)
×Q(i)で、R(i)はI番目データ量で、Q(i)
はI番目量子化値である。
(Equation 2) Here, M (i): Complexity, N: the number of frames in GOP units, and n: the number of frames. At this time, M (i) becomes R (i)
× Q (i), R (i) is the I-th data amount, and Q (i)
Is the I-th quantized value.

【0011】伝送器220は、バッファ(図示せず)を
具備し、MPEG符号化器210で発生する圧縮された
映像データをバッファリングしてネットワーク230に
伝送する。伝送率制御器240は、伝送器220及び複
雑度予測器250から複雑度予測値及びバッファのデー
タ占有量を印加され、ネットワーク230から帯域幅情
報が含まれたネットワーク状態情報を受信する。ここで
ネットワーク状態情報は、ATM(asynchronous trans
fer mode)のABR(available bit rate)サービスの
ようにRM(resource management)セルを通して伝送
率制御器240にフィードバックされうる。
The transmitter 220 includes a buffer (not shown), buffers the compressed video data generated by the MPEG encoder 210, and transmits the buffered video data to the network 230. The rate controller 240 receives the complexity estimation value and the data occupancy of the buffer from the transmitter 220 and the complexity estimator 250, and receives network status information including bandwidth information from the network 230. Here, the network state information is an ATM (asynchronous trans).
As in the case of an ABR (available bit rate) service in a fer mode, the data can be fed back to the rate controller 240 through a resource management (RM) cell.

【0012】従って、伝送率制御器240は、複雑度予
測器250から予測された複雑度値と現在ネットワーク
230から割当てられた帯域幅情報、そして現在伝送器
220が有しているバッファのデータ占有量に基づいて
圧縮する量子化値(Q:quantization scale)を数学式
3のように決定してMPEG符号化器210に出力す
る。ここで伝送率制御器240は、バッファのデータ占
有量をあらかじめ決まった目標値で一致させるように量
子化値を調節する。即ち、伝送器220のバッファのデ
ータ占有量を目標値で維持するために、バッファのデー
タ占有量が目標値より大きければ、量子化値Qを増やし
てMPEG符号化器210で符号化されるデータ量を縮
めるべきであり、反対にバッファのデータ占有量が目標
値より少なければ量子化値Qを縮めてMPEG符号化器
210で符号化されるデータ量を増やすべきである。ま
た、伝送率制御器240が量子化値Qを決定する時、現
在ネットワーク帯域幅情報を含ませて伝送器220のバ
ッファオーバーフローによるデータ損失を縮められる。
また伝送率制御器240の量子化値Qは一定のビット数
の制限があるのでH、Lにより飽和される。
Accordingly, the rate controller 240 calculates the complexity value predicted by the complexity predictor 250, the bandwidth information allocated from the current network 230, and the data occupancy of the buffer of the current transmitter 220. A quantization value (Q: quantization scale) to be compressed based on the amount is determined as in Equation 3, and is output to the MPEG encoder 210. Here, the transmission rate controller 240 adjusts the quantization value so that the data occupancy of the buffer matches the predetermined target value. That is, in order to maintain the data occupancy of the buffer of the transmitter 220 at the target value, if the data occupancy of the buffer is larger than the target value, the quantization value Q is increased and the data to be encoded by the MPEG encoder 210 is increased. On the contrary, if the data occupancy of the buffer is smaller than the target value, the quantization value Q should be reduced to increase the amount of data encoded by the MPEG encoder 210. Also, when the rate controller 240 determines the quantization value Q, data loss due to buffer overflow of the transmitter 220 can be reduced by including the current network bandwidth information.
Further, the quantization value Q of the transmission rate controller 240 is saturated by H and L because there is a limit of a certain number of bits.

【0013】[0013]

【数3】 の最小、最大値である。(Equation 3) Are the minimum and maximum values of

【0014】結局、数学式3にも示されたように伝送率
制御器240は、既にネットワーク230に割当てられ
た帯域幅に基づいてバッファのデータ占有量を目標値で
一致させうるように量子化値を決定するため、ネットワ
ークの混雑によるデータの損失を最大限減らしうる。ま
た伝送率制御器240は、一つのフレームを圧縮する直
前に常に量子化値を計算するために、常に割当てられた
ネットワーク帯域幅に合せて適当なデータ量を生成す
る。
Finally, as shown in Equation 3, the rate controller 240 performs quantization so that the data occupancy of the buffer can be made equal to the target value based on the bandwidth already allocated to the network 230. Since the value is determined, data loss due to network congestion can be reduced as much as possible. Further, the transmission rate controller 240 always generates an appropriate data amount in accordance with the allocated network bandwidth in order to always calculate the quantization value immediately before compressing one frame.

【0015】MPEG符号化器210は、伝送率制御器
240で発生する量子化値Qに従ってバッファの目標占
有量に合うように出力される映像データ量を適当にMP
EG符号化する。図3及び図4は、MPEGW.Gで提
案された“TEST model(TM−5)”と本発明に提案さ
れた装置で映像データを各々伝送した場合の映像の品質
と帯域幅の利用度を示す。図3はフレームによるPSN
R(peak signal to noise ratio)(dB)を示し、図
4は時間に従う帯域幅利用度(%)を示す。図3及び図
4に示したように、提案された装置がTM−5より映像
の品質がさらに一定で同時に帯域幅の利用度が大きく維
持される。
The MPEG encoder 210 appropriately adjusts the amount of video data output to match the target occupancy of the buffer according to the quantization value Q generated by the transmission rate controller 240.
Perform EG encoding. 3 and 4 show MPEGW. G shows the "TEST model (TM-5)" proposed by G and the video quality and bandwidth utilization when video data is transmitted by the apparatus proposed in the present invention. Figure 3 shows PSN by frame
R (peak signal to noise ratio) (dB), and FIG. 4 shows bandwidth utilization (%) over time. As shown in FIGS. 3 and 4, the proposed device has a more constant image quality than TM-5 and at the same time maintains a high bandwidth utilization.

【0016】本発明は前述した実施形態に限られず、本
発明の思想内で当業者による変形が可能である。即ち、
本発明の装置はネットワークで映像を伝送する全てのシ
ステムに適用可能で、映像をインターネットのようなデ
ータ網に伝送する時全てのハードウェアに適用できる。
The present invention is not limited to the above-described embodiment, and can be modified by those skilled in the art within the spirit of the present invention. That is,
The apparatus of the present invention is applicable to all systems for transmitting video over a network, and is applicable to all hardware when transmitting video to a data network such as the Internet.

【0017】[0017]

【発明の効果】前述したように、本発明によれば、映像
を伝送する時映像の画質を最小化しながら同時に帯域幅
の利用度を最大にすることができ、リアルタイムで映像
データを圧縮伝送できるため、時間に従う帯域幅の変化
に対する適応力に優れてインターネットを通した映像伝
送が容易である。
As described above, according to the present invention, it is possible to maximize the utilization of the bandwidth while minimizing the image quality of the image when transmitting the image, and to compress and transmit the image data in real time. Therefore, the video transmission through the Internet is easy with excellent adaptability to the change of the bandwidth according to time.

【図面の簡単な説明】[Brief description of the drawings]

【図1】 本発明が適用されるMPEG符号化器のブロ
ック図である。
FIG. 1 is a block diagram of an MPEG encoder to which the present invention is applied.

【図2】 本発明に係るネットワーク帯域幅に適応的な
データ伝送率制御装置のブロック図である。
FIG. 2 is a block diagram of a data rate control device adaptive to a network bandwidth according to the present invention;

【図3】 本発明を適用して映像を伝送した場合映像の
品質を示すグラフである。
FIG. 3 is a graph showing image quality when an image is transmitted by applying the present invention.

【図4】 本発明を適用して映像を伝送した場合帯域幅
利用度を示すグラフである。
FIG. 4 is a graph showing bandwidth utilization when a video is transmitted by applying the present invention.

【符号の説明】[Explanation of symbols]

120 DCT器 130 量子化器(Q) 140 VLC(Variable Length Coding) 150 逆量子化器 160 IDCT器 170 フレームメモリ(FM) 180 動き推定器 210 MPEG符号化器 220 伝送器 230 ネットワーク 240 伝送率制御器 250 複雑度予測器 Reference Signs List 120 DCT unit 130 Quantizer (Q) 140 VLC (Variable Length Coding) 150 Inverse quantizer 160 IDCT unit 170 Frame memory (FM) 180 Motion estimator 210 MPEG encoder 220 Transmitter 230 Network 240 Transmission rate controller 250 Complexity Predictor

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 帯域幅情報を提供するデータネットワー
クで映像データの伝送率を制御する伝送率装置におい
て、 入力される映像データを所定の量子化値で量子化して圧
縮する映像圧縮手段と、 前記映像圧縮手段から発生する圧縮された映像データを
バッファリングして前記ネットワークに伝送する伝送手
段と、 入力される映像データから符号化する映像データの複雑
度を予測する複雑度予測手段と、 前記伝送手段でバッファリングされたデータ量と前記複
雑度予測器で予測された複雑度と前記ネットワークから
提供された帯域幅に基づいて前記映像圧縮手段の量子化
値を決定し、前記帯域幅範囲内で前記バッファリングさ
れたデータ量をあらかじめ決まった目標値に一致させる
ように前記量子化値を調節する制御手段とを含む映像伝
送率制御装置。
1. A transmission rate control apparatus for controlling a transmission rate of video data in a data network providing bandwidth information, comprising: video compression means for quantizing input video data by a predetermined quantization value and compressing the video data; Transmission means for buffering the compressed video data generated from the video compression means and transmitting the buffered video data to the network; complexity prediction means for predicting the complexity of video data to be encoded from input video data; Determining the quantization value of the video compression means based on the amount of data buffered by the means, the complexity predicted by the complexity predictor, and the bandwidth provided from the network, within the bandwidth range. Control means for adjusting the quantization value so that the buffered data amount matches a predetermined target value. Control device.
【請求項2】 前記複雑度予測手段の前記複雑度は、量
子化値×データ量で設定されることを特徴とする請求項
1に記載の映像伝送率制御装置。
2. The video transmission rate control device according to claim 1, wherein said complexity of said complexity predicting means is set by quantization value × data amount.
【請求項3】 前記制御手段で量子化値は、 【数1】 の最小、最大値であることを特徴とする請求項1に記載
の映像伝送率制御装置。
3. A quantization value obtained by the control means is expressed by the following equation. The video transmission rate control device according to claim 1, wherein the minimum value and the maximum value are determined by the following formulas.
JP2000246481A 1999-08-20 2000-08-15 Data transmission rate controller adaptive to network bandwidth Pending JP2001094997A (en)

Applications Claiming Priority (2)

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KR19990034580A KR100601615B1 (en) 1999-08-20 1999-08-20 Apparatus for compressing video according to network bandwidth

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KR (1) KR100601615B1 (en)
CN (1) CN1263307C (en)

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KR100601615B1 (en) 2006-07-14

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