JPS5997286A - Coding system - Google Patents

Coding system

Info

Publication number
JPS5997286A
JPS5997286A JP20697082A JP20697082A JPS5997286A JP S5997286 A JPS5997286 A JP S5997286A JP 20697082 A JP20697082 A JP 20697082A JP 20697082 A JP20697082 A JP 20697082A JP S5997286 A JPS5997286 A JP S5997286A
Authority
JP
Japan
Prior art keywords
circuit
difference
output
image signal
difference circuit
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
JP20697082A
Other languages
Japanese (ja)
Inventor
Kiichi Matsuda
松田　喜一
Toshitaka Tsuda
俊隆 津田
Takeshi Okazaki
健 岡崎
Shinichi Maki
新一 牧
Makoto Hiraoka
誠 平岡
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP20697082A priority Critical patent/JPS5997286A/en
Publication of JPS5997286A publication Critical patent/JPS5997286A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To attain suitable coding both for still and dynamic pictures by allowing to switch automatically space resolution and time resolution depending on an input signal. CONSTITUTION:The coding circuit is provided with a difference circuit SUB1 outputting the difference between a present picture signal and a forecast picture signal before n-field, a difference circuit SUB2 outputting difference between its output and a signal before m-bit, a quantizing circuit Q, a transmission buffer Buf, and a local coding circuit. A pre-processing circuit discriminates whether an input picture signal is a still picture or a dynamic picture. A control circuit controls switches SW1, SW2 by the output of the pre-processing circuit and in case of a still picture, they are connected in solid lines and in case of a dynamic picture, they are connected in dotted lines. That is, in case of the still picture, the output of a memory FM2 at the final stage of a local decoding circuit is inputted to the difference circuit SUB1. In case of the dynamic picture, the two difference circuits are disconnected by a signal from a transmission buffer Buf and the coding is stopped.

Description

【発明の詳細な説明】 （ａ）　　発明の技術分野 不発明は、入力信号に依存して空間解像度と時間解像度
が自動的に切替わる符号化方式に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The invention relates to a coding system in which spatial resolution and temporal resolution are automatically switched depending on an input signal.

（ｂ）　　従来技術及び問題点 一般に画像信号を伝送する時には、伝送する情報量を減
らすために符号化を行なう。この符号化を行なう場合、
静止画の場合には空間解像度を重要視し、動画の場合は
時間解像度を重要視する必要がある。(b) Prior Art and Problems Generally, when transmitting an image signal, encoding is performed to reduce the amount of information to be transmitted. When performing this encoding,
In the case of still images, it is necessary to emphasize spatial resolution, and in the case of moving images, it is necessary to emphasize temporal resolution.

すなわち静止画の場合には画像を正確に表現するため、
１フレーム当りの画素数を大きくして空洞解像度を向上
させ、一方時間的には変化が少ないので、単位時間内に
送出するフレームの数を少なくする。又動画の場合には
動きをできるだけ正確に表現するため、単位時間当りに
送出するフレーム数を多くし、一方１フレーム内の画素
数は少なくする。In other words, in the case of still images, in order to accurately represent the image,
The cavity resolution is improved by increasing the number of pixels per frame, and on the other hand, since there is little change in time, the number of frames transmitted within a unit time is reduced. In the case of moving images, in order to express motion as accurately as possible, the number of frames transmitted per unit time is increased, while the number of pixels within one frame is decreased.

しかしながら従来は伝送路の伝送速度のみによって、フ
レーム別の画素数及び単位時間当りに送出するフレーム
数を決定していたため、静止画。However, in the past, the number of pixels for each frame and the number of frames to be sent per unit time were determined only by the transmission speed of the transmission path, so still images were not processed.

動画のいずれの場合も満足な画像を伝送することができ
なかった・ （ｃ）　　発明の目的と構成 本発明はこの様な点に鑑みてなされたもので、静止画、
動画のいずれの場合も満足できる符号方式を提供するこ
とを目的とし、この様な目的は、現在入力している画像
信号とｎフィールド前の予１＋１１１画像信号との差を
出力する第１の差回路と、該第１の差回路出力とｍビッ
ト前の予測画像信号との差を出力する第２の差回路と、
該第２の差回路出力を参″子化する童子化回路と、該量
子化回路出力をストアする送信バッファと、該ｍビット
前の予測画像信号及びｎフィールド前の予測画信号を生
成する紀１．第２の局部復号化回路とを有する符号化回
路において、現在入力している画像信号とｎフィールド
前の予測画信号との差に基づいて入力画信号が静止画で
あるか、動画であるかを判定する前処理回路と、該第２
の局部復号化回路に設けた予測画信号をストアする複数
のメモリと、第１．第２の差回路間に設けられた第１の
スイッチと、該紀１の差回路と、第２の局部復号化回路
出力段の間に設けられた第２のスイッチと、該第１、第
２のスイッチを該前処理回路出力により制御する制御部
とを有し、該前処理回路出力が静止画を表わす場合には
、該第１の差回路へ該第２の局部復号化回路における最
終段のメモリ出力が入力する様に該第２のスイッチを制
御し、該前処理回路出力が動画を表わす場合には、該第
２の局部復号化回路における最終段以外のメモリか、該
第１の差回路へ入力する様該第２のスイッチを制御し、
一方該第１のスイッチは静止の場合は、第１゜第２の差
回路を直列に接続する様、動画の場合は、該送信バッフ
ァからの送信バッファに余裕がなくなって来たことを示
す信号によ、り該第１．第２の差回路を切離し、符号化
を停止する様に制御することを特徴とする符号化方式に
よって達成される。In both cases of moving images, it was not possible to transmit satisfactory images.
The purpose is to provide a coding system that is satisfactory in any case of moving images, and this purpose is to provide a first difference that outputs the difference between the currently input image signal and the pre-1+111 image signal n fields ago. a second difference circuit that outputs a difference between the first difference circuit output and a predicted image signal m bits earlier;
a doji conversion circuit that converts the output of the second difference circuit into a reference; a transmission buffer that stores the output of the quantization circuit; and a circuit that generates the predicted image signal of m bits before and the predicted image signal of n fields before. 1. In an encoding circuit having a second local decoding circuit, it is determined whether the input image signal is a still image or a moving image based on the difference between the currently input image signal and the predicted image signal n fields before. a preprocessing circuit that determines whether the second
a plurality of memories for storing predicted image signals provided in the local decoding circuit of the first . a first switch provided between the second difference circuit; a second switch provided between the first difference circuit; and the second local decoding circuit output stage; and a control unit that controls a second switch in the second local decoding circuit to the first difference circuit when the preprocessing circuit output represents a still image. The second switch is controlled so that the memory output of the second stage is input, and when the output of the preprocessing circuit represents a moving image, the second switch is controlled so that the memory output of the second local decoding circuit is input to a memory other than the final stage, or the first controlling the second switch to input to the difference circuit;
On the other hand, if the first switch is stationary, the first and second difference circuits are connected in series, and in the case of a moving image, a signal is sent from the transmitting buffer indicating that the transmitting buffer is running out of room. According to Part 1. This is achieved by an encoding method characterized by disconnecting the second difference circuit and controlling the encoding to stop.

（ｄ）発明の実施例 以下本発明を実施例に従って説明する。(d) Examples of the invention The present invention will be explained below according to examples.

本発明においては、符号化に先立って、入力画信号が動
画であるか、静止画であるかを判定する。In the present invention, prior to encoding, it is determined whether the input image signal is a moving image or a still image.

そして、この判定結果を基に符号化回路の構成を変更し
て時間解像度と空間解像度のいずれか一方を重要視した
符号化を行なう。第１図は動画と静止画とを判定する前
処理回路である。Then, based on this determination result, the configuration of the encoding circuit is changed to perform encoding that emphasizes either the temporal resolution or the spatial resolution. FIG. 1 shows a preprocessing circuit that determines whether a moving image or a still image exists.

図中、１ｎｌｄ入力端子、ＳＵＢは差回路、ＮＵ、Ｉ図
の回路では、入力端子ｉｎから入力した画信号とフレー
ムメモリＦＭからの１フレーム前の画信号との差を差回
路で求め非ＭＭ回路ＮＬＩに入力する。In the figure, the 1nld input terminal and SUB are difference circuits, and in the circuit shown in NU and I, the difference between the image signal input from the input terminal in and the image signal of the previous frame from the frame memory FM is calculated using the difference circuit. Input to circuit NLI.

非直線回路ＮＬＩは、ノイズにより差信号が極端に大き
な値にならない様に最大額を、ある値におさえる回路で
ある。この非直線回路ＮＬＩがらの出力はモード！Ｔ４
Ｊ足部ＭＪＵに入力する。The nonlinear circuit NLI is a circuit that suppresses the maximum amount to a certain value so that the difference signal does not become an extremely large value due to noise. The output of this non-linear circuit NLI is mode! T4
Input to J foot MJU.

モード判定ｍｌＩＭＪＵでは、第２図に示す様忙入力し
てぐる差信号の情報量が閾値ＴＨより大きいか小さいか
を数フレームにわたって判定する◇そして、情報量が四
種より大きい場合には動画と判定し、逆の場合には静止
画と判定し、制御信号Ｃを出力する。制−信号は、又情
報量が極端に多いことも表わす様な符号構成とする。こ
の制御信号Ｃにより前述の如く回路構成を変更するが、
その−例を第３図に示すａ 図中、Ｃ０ＮＴは制御回路、５ＵＢ１．５ＵＢ２は差回
路、ＭＵＬｌ、ＭＵＬ２Ｈかけ算回路、ＳＷＩ。In the mode judgment mlIMJU, as shown in Fig. 2, it is determined over several frames whether the information amount of the difference signal is larger or smaller than the threshold TH. In the opposite case, it is determined that the image is a still image, and a control signal C is output. The control signal also has a code structure that indicates an extremely large amount of information. This control signal C changes the circuit configuration as described above.
An example of this is shown in FIG. 3. In the figure, C0NT is a control circuit, 5UB1.5UB2 are difference circuits, MUL1, MUL2H multiplication circuits, and SWI.

ＳＷ２はスイッチ、Ｑは量子化回路、Ｄは遅延回路、Ｉ
Ｐは補間回路、ＦＭＩ、ＦＭ２はフレームメモリである
。SW2 is a switch, Q is a quantization circuit, D is a delay circuit, I
P is an interpolation circuit, FMI and FM2 are frame memories.

図において、制御信号Ｃが静止画であることを示す場合
、制御回路Ｃ０ＮＴは、スイッチＳＷＩ。In the figure, when the control signal C indicates a still image, the control circuit C0NT switches to the switch SWI.

ＳＷ２により実線で示す如き接続を行なう。これにより
差回路５ＵＢＩには、フレームメモリＦＭとＦＭ２から
の画信号が入力し、ここでフレーム間の差分が出力され
る。Connections as shown by solid lines are made by SW2. As a result, the image signals from the frame memories FM and FM2 are input to the difference circuit 5UBI, and the difference between frames is output here.

更に具体的に述べると、インターレース走査の場合、１
フレームは２フイールドで構成される。More specifically, in the case of interlaced scanning, 1
A frame consists of two fields.

そして、最初のフィールドをＦｌとし、次のフィールド
をＦ２とすると１番目のフレームのフィールドＦ１がフ
レームメモリＦＭ２に記憶された時２奇目のフレームの
フィールドＦ１が差回路５ＵＢｌに入力する０次に１番
目のフレームのフィールドＦ２がフレームメモリＦＭ２
に記憶された時差回路５ＵＢＩには２＠目のフレームの
フィールドＦ２が入力する。以下同様のことを繰返す。Then, if the first field is Fl and the next field is F2, when the field F1 of the first frame is stored in the frame memory FM2, the field F1 of the second odd frame is input to the difference circuit 5UBl. Field F2 of the first frame is in frame memory FM2
The field F2 of the second@th frame is input to the time difference circuit 5UBI stored in the time difference circuit 5UBI. Repeat the same process below.

以上のことかられかる様に静止画の場合は隣接フレーム
の同一フィールド同志で差信号が作られるＯ ここで静止画の場合、動きが少ないことを考えると隣接
フレームの同一フレームは相関が極めて強いことが考え
られるので、忠実な信号を送ることができるとともに両
者の差は小さいので差信号のレベルを小さくできる。一
方制御信号Ｃが動画を表わす場合、制御回路Ｃ０ＮＴは
スイッチＳＷ２を点線の如く切替えて、フレームメモリ
ＦＭＩの出力を差回路５ＵＢ１に入力する。この場合前
述の説明から明らかに様に、時トｊ的に隣接しているフ
ィールド間で差信号が作られる。As can be seen from the above, in the case of still images, a difference signal is created between the same fields of adjacent frames.In the case of still images, considering that there is little movement, the correlation between the same frames of adjacent frames is extremely strong. Therefore, it is possible to send a faithful signal, and since the difference between the two is small, the level of the difference signal can be reduced. On the other hand, when the control signal C represents a moving image, the control circuit C0NT switches the switch SW2 as shown by the dotted line to input the output of the frame memory FMI to the difference circuit 5UB1. In this case, as is clear from the above description, a difference signal is generated between temporally adjacent fields.

洞見ば、フレームメモリＦＭＩに１番目のフレームのフ
ィールドＦ１が記憶されている時は、差回路ＳＵＢ　１
には１番目のフレームのフィールドＦ２が入力する。そ
して両者の差が出力される。In other words, when the field F1 of the first frame is stored in the frame memory FMI, the difference circuit SUB 1
Field F2 of the first frame is input to . Then, the difference between the two is output.

又制御信号Ｃが、動画でしかも情報量が極めて多多いこ
とを示してい′る時、制御回路Ｃ０ＮＴはスイッチＳＷ
１を点線で示す様に切替えて、符号を停止する。Also, when the control signal C indicates that it is a moving image and the amount of information is extremely large, the control circuit C0NT switches the switch SW.
1 as shown by the dotted line and the code is stopped.

更に制御回路Ｃ０ＮＴは送信バッファＢｕｆからメモリ
容量に余裕がなくなったことを示す信号により、スイッ
チＳＷ１を点線の如く切替えて、アースし、符号化を停
止する。従って送信バッファＢｕｆ内では、間引きされ
た状態となる。しかしながら差信号は隣接したフィール
ド間で作られるので、画質は悪いが動作を忠実に伝送で
きる。Furthermore, the control circuit C0NT switches the switch SW1 as shown by the dotted line in response to a signal from the transmission buffer Buf indicating that the memory capacity is no longer available, grounds it, and stops encoding. Therefore, the data in the transmission buffer Buf is thinned out. However, since the difference signal is generated between adjacent fields, the motion can be faithfully transmitted although the image quality is poor.

ここで動画の場合各フレーム毎に符号化を開始し、１フ
レームに割当てられた情報量（約５０Ｋｂｉｔ）の発生
が完了した時点で該当フレームの符号化を停止し、次の
フレームの先頭から符号化を開始する。この様子を第４
図（ａ）に示す。図中１゜２はフレーム番号を示し、ａ
ｌは第１フイールドを、ａ２は第２フイールドを示し、
点線は符号化された部分を○印は符号化■始点を示す。In the case of a video, encoding is started for each frame, and when the amount of information allocated to one frame (approximately 50 Kbits) has been generated, the encoding of that frame is stopped, and the encoding starts from the beginning of the next frame. start converting. This situation can be seen in the fourth
Shown in Figure (a). In the figure, 1゜2 indicates the frame number, a
l indicates the first field, a2 indicates the second field,
The dotted line indicates the encoded part, and the ○ mark indicates the coding start point.

すなわち第１フレームでは情報量が５０Ｋｂｉｔを第２
フレームの途中で越えたのでここで符号化を停止し、第
２フレームの先頭から符号化を始め、第２フイールドま
で全部符号化したことを意味している。In other words, the amount of information in the first frame is 50Kbits, and the amount of information in the second frame is 50Kbits.
This means that since the time was exceeded in the middle of the frame, encoding was stopped here, encoding started from the beginning of the second frame, and the entirety up to the second field was encoded.

第４図（ｂ）に静止画の場合を示す。この場合は、符号
化は第１フレームの第１フイールドから連続的に符号化
を行なうことを意味している。FIG. 4(b) shows the case of a still image. In this case, encoding means to perform encoding continuously from the first field of the first frame.

（ｅ）　　発明の効果 以上の如く、本発明によれば静止画と動画の場合とで、
回路構成を変更して、空間解像度と時間解像度の切換を
行なっているので最適な符号化を行なうことができる。(e) Effects of the invention As described above, according to the present invention, in the case of still images and moving images,
Since the circuit configuration is changed to switch between spatial resolution and temporal resolution, optimal encoding can be performed.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は、本発明に用いる前処理回路の一例を示す図、
第２図は第１図の動作説明図、第３図は本発明を適用し
た符号化回路を示す図、第４図は第３図の動作説明図で
ある。 図中、ＳＵＢ、５ＵＢ１．５ＵＢ２は差回路、ＳＷｌ、
ＳＷ２はスイッチ、ＦＭ、ＦＭＩ、ＦＭ２はフレームメ
モリ、ＭＪＵはモード判定部、Ｂｕｆは送信バッファで
ある。 算　１　図 洋４図 （ａ） ｌどFIG. 1 is a diagram showing an example of a preprocessing circuit used in the present invention;
2 is an explanatory diagram of the operation of FIG. 1, FIG. 3 is a diagram showing an encoding circuit to which the present invention is applied, and FIG. 4 is an explanatory diagram of the operation of FIG. 3. In the figure, SUB, 5UB1.5UB2 are difference circuits, SWl,
SW2 is a switch, FM, FMI, FM2 is a frame memory, MJU is a mode determination unit, and Buf is a transmission buffer. Mathematics 1 Zuyo Figure 4 (a) l.

Claims (3)

【特許請求の範囲】[Claims] （１）現在入力している画像信号とｎフィールド前の予
測−１家信号との差を出力する第１の差回路と、該第１
の差回路出力とｍビット前の予測画像信号との差を出力
する第２の差回路と、該第２の差回路出力を量子化する
量子化回路と、該量子化回路出力をストアする送信バッ
ファと、該ｍビット前の予測画像信号及びｎフィールド
前の予測画信号を生成する第１．第２の局部復号化回路
とを有する符号化回路において、現在入力している画像
信号とｎフィールド前の予測画信号との差に基づいて入
力′ＵＩＪＪ信号が静止画であるか、動画であるかを判
定する前処理回路と、該第２の局部復号化回路に設けた
予測画信号をストアする複数のメモリと、第１．嬉２の
差回路向に設けられた謔１のスイッチと、該第１の差回
路と、第２の局部復号化回路出力段の間に設けられた第
２のスイッチと、該第１、第２のスイッチを該前処理回
路出力により制御する制御部とを有し、該前処理回路出
力が静止画を表わす場合には、該第１の差回路へ該第２
の局部復号化回路における最終段のメモリ出力が入力す
る様に、該第２のスイッチを制御し、該前処理回路出力
が動画を表わす場合には、該第２の局部復号化回路にお
ける最終段以外のメモリ出力か該第１の差回路へ入力す
る様該第２のスイッチを制御し、一方該第１のスイッチ
は静止画の場合は、第１．第２の差回路を直列に接続す
る様、動画の場合は、該送信バッファからの送信バッフ
ァに余裕がなくなって来たことを示す信号により該第１
１第２の差回路を切離し、符号化を停止する様に制御す
ることを特徴とする符号化方式。(1) A first difference circuit that outputs the difference between the currently input image signal and the predicted −1 signal from n fields ago;
a second difference circuit that outputs the difference between the difference circuit output and a predicted image signal m bits before, a quantization circuit that quantizes the second difference circuit output, and a transmission that stores the quantization circuit output. a buffer, a first . In the encoding circuit having a second local decoding circuit, it is determined whether the input 'UIJJ signal is a still image or a moving image based on the difference between the currently input image signal and the predicted image signal n fields before. a preprocessing circuit for determining whether the first . a first switch provided in the direction of the second difference circuit; a second switch provided between the first difference circuit and the second local decoding circuit output stage; a control unit that controls the second switch by the output of the preprocessing circuit, and when the output of the preprocessing circuit represents a still image, the second switch is connected to the first difference circuit.
The second switch is controlled so that the memory output of the final stage in the local decoding circuit is inputted, and when the output of the preprocessing circuit represents a moving image, the final stage memory output of the second local decoding circuit is input. The second switch is controlled so that the memory output other than the first one is input to the first difference circuit, while the first switch is controlled to input the first one to the first difference circuit in the case of a still image. In order to connect the second difference circuit in series, in the case of a moving image, a signal from the transmission buffer indicating that there is no more room in the transmission buffer can be used to connect the first difference circuit in series.
1. An encoding method characterized in that the second difference circuit is disconnected and controlled to stop encoding. （２）現在入力している画像信号とｎフィールド前の予
測画像信号との差を出力する第１の差回路と、該第１の
差回路出力とｍビット前の予測画像信号との差を出力す
る第２の差回路と、該第２の差回路出力を量子化する量
子化回路と、該量子化回路出力をストアする送信バッフ
ァと、該ｍビット前の予測画像信号及びｎフィールド前
の予測画信号を生成する第１．第２の局部復号化回路と
を有する符号化回路において、現在入力している画像信
号とｎフィールド前の予測画信号との差に基づいて入力
画信号が静止画であるか、動画であるかを判定する前処
理回路と、該第２の局部復号化回路に設けた予測画信号
をストアする複数のメモリと、第１．第２の差回路間に
設けられた第１のスイッチと、該第１の差回路と、第２
の局部復号化回路出力段の間に設けられた第２のスイッ
チと、該第１、第２のスイッチを該前処理回路出力によ
り制御する制御部とを有し、該前処理回路出力が静止画
を表わす場合には、該第１の差回路へ該第２の局部復号
化回路における最終段のメモリ出力が入力する様に、該
第２のスイッチを制御し、該前処理回路出力が動画を表
わす場合には、該第２の局部係号化回路における最終段
以外のメモリ出力か該第１の差回路へ入力する様該第２
のスイッチを制御し、一方該第１のスイッチは、静止画
の場合はグ１．第２の差回路を直列に接続する様、動画
の場は、情報量が多いことを示す該前処理回路出力によ
り、該第１６第２の差回路を切離し、符号化を停止する
様に制御することを特徴とする符号化方式。(2) A first difference circuit that outputs the difference between the currently input image signal and the predicted image signal n fields before, and a difference between the output of the first difference circuit and the predicted image signal m bits ago. a second difference circuit for outputting a second difference circuit, a quantization circuit for quantizing the output of the second difference circuit, a transmission buffer for storing the output of the quantization circuit, and a prediction image signal for the m bits before and the prediction image signal for the n fields before. The first step is to generate a predicted image signal. An encoding circuit having a second local decoding circuit determines whether the input image signal is a still image or a moving image based on the difference between the currently input image signal and the predicted image signal n fields before. a preprocessing circuit for determining the second local decoding circuit; a plurality of memories for storing predicted image signals provided in the second local decoding circuit; a first switch provided between the second difference circuit, the first difference circuit, and the second difference circuit;
a second switch provided between the output stage of the local decoding circuit; and a control section that controls the first and second switches by the output of the preprocessing circuit, and the output of the preprocessing circuit is stationary. When displaying a video, the second switch is controlled so that the memory output of the final stage in the second local decoding circuit is input to the first difference circuit, and the output of the preprocessing circuit is , the second local coding circuit is configured such that the memory output other than the final stage in the second local coding circuit is input to the first difference circuit.
, while the first switch controls G1. in the case of a still image. The second difference circuit is connected in series, and the video field is controlled to disconnect the second difference circuit and stop encoding according to the output of the preprocessing circuit indicating that the amount of information is large. An encoding method characterized by: （３）現在入力している画像信号とｎフィールド前の予
測画像信号との差を出力する第１の差回路と、該第１の
差回路出力とｍビット前の予測画像信号との差を出力す
る第２の差回路と、該第２の差回路出力を量子化する量
子化回路と、該量子化回路出力をストアする送信バッフ
ァと、該ｍビット前の予測画像信号及びｎフィールド前
の予測画信号を生成する第１．第２の局部復号化回路と
を有する符号化回路において、現在入力している画像信
号とｎフィールド前の予測画信号との差に基づいて入力
画信号が静止画であるか、動画であるかを判定する前処
理回路と、該第２の局部復号化回路に設けた予測画信号
をストアする複数のメモリと、第１．第２の差回路間に
設けられた第１のスイッチと、該第１の差回路と、第２
の局部復号化回路出力段の間に設けられた第２のスイッ
チと、該第１、第２のスイッチを該前処理回路出力によ
り制御する制御部とを有し、該前処理回路出方が静止画
を表わす場合には、該第１の差回路へ該第２の局部復号
化回路における最終段のメモリ出方が入力する様に、＃
第２のスイッチをＩＩ＋御し、該前処理回路出力が動向
を表わす場合には、該第２の局部復号化回路における最
終段以外のメモリ出力か該第１の差回路へ入力する様該
第２のスイッチを制御し、一方該第１のスイッチは静止
画の場合は、第１．第２の差回路を直列に接続する様、
動画の場合は、該送信バッファからの送信バッファに余
裕がなくなって来たことを示す信号、又は情報量が多い
ことを示す該前処理回路出方の少なくともいずれか一万
で該第１．第２の差回路を切離し、符号化を停止する様
に制御することを特徴とする符号化方式。(3) A first difference circuit that outputs the difference between the currently input image signal and the predicted image signal n fields ago, and a difference between the output of the first difference circuit and the predicted image signal m bits ago. a second difference circuit for outputting a second difference circuit, a quantization circuit for quantizing the output of the second difference circuit, a transmission buffer for storing the output of the quantization circuit, and a prediction image signal for the m bits before and the prediction image signal for the n fields before. The first step is to generate a predicted image signal. An encoding circuit having a second local decoding circuit determines whether the input image signal is a still image or a moving image based on the difference between the currently input image signal and the predicted image signal n fields before. a preprocessing circuit for determining the second local decoding circuit; a plurality of memories for storing predicted image signals provided in the second local decoding circuit; a first switch provided between the second difference circuit, the first difference circuit, and the second difference circuit;
a second switch provided between the output stage of the local decoding circuit; and a control unit that controls the first and second switches by the output of the preprocessing circuit, and the output stage of the preprocessing circuit is When representing a still image, # is input so that the memory output of the final stage in the second local decoding circuit is input to the first difference circuit.
When the second switch is controlled by II+, and the output of the preprocessing circuit indicates a trend, the output of the memory other than the final stage in the second local decoding circuit is input to the first difference circuit. On the other hand, in the case of a still image, the first switch controls the first switch. To connect the second difference circuit in series,
In the case of a moving image, at least one of the signals from the transmission buffer indicating that there is no more room in the transmission buffer, or the output of the preprocessing circuit indicating that the amount of information is large, is detected by the first signal. An encoding method characterized in that the second difference circuit is disconnected and controlled to stop encoding.
JP20697082A 1982-11-26 1982-11-26 Coding system Pending JPS5997286A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20697082A JPS5997286A (en) 1982-11-26 1982-11-26 Coding system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20697082A JPS5997286A (en) 1982-11-26 1982-11-26 Coding system

Publications (1)

Publication Number Publication Date
JPS5997286A true JPS5997286A (en) 1984-06-05

Family

ID=16532015

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20697082A Pending JPS5997286A (en) 1982-11-26 1982-11-26 Coding system

Country Status (1)

Country Link
JP (1) JPS5997286A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6338379A (en) * 1986-08-01 1988-02-18 Matsushita Electric Ind Co Ltd Moving picture compressing device of picture quality switching type
JPS63191488A (en) * 1987-02-04 1988-08-08 Toshiba Corp Image transmitter
JPH0483916U (en) * 1990-11-30 1992-07-21

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6338379A (en) * 1986-08-01 1988-02-18 Matsushita Electric Ind Co Ltd Moving picture compressing device of picture quality switching type
JPS63191488A (en) * 1987-02-04 1988-08-08 Toshiba Corp Image transmitter
JPH0483916U (en) * 1990-11-30 1992-07-21

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