JPS5930366A - Device for encoding picture - Google Patents

Device for encoding picture

Info

Publication number
JPS5930366A
JPS5930366A JP57141473A JP14147382A JPS5930366A JP S5930366 A JPS5930366 A JP S5930366A JP 57141473 A JP57141473 A JP 57141473A JP 14147382 A JP14147382 A JP 14147382A JP S5930366 A JPS5930366 A JP S5930366A
Authority
JP
Japan
Prior art keywords
mode
pixel
signal
interest
transmission
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.)
Granted
Application number
JP57141473A
Other languages
Japanese (ja)
Other versions
JPH0214830B2 (en
Inventor
Fumitaka Ono
文孝 小野
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP57141473A priority Critical patent/JPS5930366A/en
Publication of JPS5930366A publication Critical patent/JPS5930366A/en
Publication of JPH0214830B2 publication Critical patent/JPH0214830B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/41—Bandwidth or redundancy reduction
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T9/00—Image coding
    • G06T9/004—Predictors, e.g. intraframe, interframe coding

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To reduce the transmission time, by storing mode information to which each state belongs at both transmission and receiving sides, using a code suitable for each mode, encoding the estimated order and attaining the encoder in response to the property of the information source. CONSTITUTION:An estimating conversion table is stored in an estimating converter 41 at the transmission side, a contrast level signal of a noted picture element X is converted into an estimated order C in response to a density pattern of picture signals A, B outputted from a picture element memory 43 and applied to a switching device 44. Further, a signal M represented with the order C is generated from a mode signal generator 42 in response to the density pattern of the signals A, B, and the signal M is applied to a switching device 44, an S mode encoder 45, a W mode encoder 46, and a transmission code word selector 47. Further, the code suitable for each mode is used, the order C is coded, and applied to an S mode decoder 52 and a W mode decoder 53 from a transmission line 100 at the receiving side and the signal is decoded in response to the property of the signal source.

Description

【発明の詳細な説明】 本発明は中間調画像信号、の高効率伝送を行なうだめの
画像符号化装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image encoding device for highly efficient transmission of halftone image signals.

従来、この種の画像符号化装置として、参照画素のとる
値を入力とし、注目画素のとるべき値の予測順位を出力
とする予測順位表を送受信側に備え、注目画素信号レベ
ルを予測順位値に変換して符号化伝送する装置が知られ
ている。Conventionally, this type of image encoding device has been equipped with a prediction ranking table on the transmitting and receiving sides that inputs the value taken by the reference pixel and outputs the predicted ranking of the value that the pixel of interest should take, and uses the signal level of the pixel of interest as a predicted ranking value. There is a known device that converts the data into code and transmits the coded data.

情報理論によれば、シンボルａＯ，・・−ａｎ−ｌ（７
）％出現確率をＰＯ，・・ｔｆ’ｎ−Ｉとすると、１シ
ンボルあたりの情報量ｌ（は で与えられる。１画素当たりＨビットというのが情報理
論に於ける縮約限界であり、これはシンボルａ４　　の
符８語長／ｉ　を Ｊｉ＝−１０ｇ２Ｐｉ　　（ｂｔｕ） とできる時に実現されるものである。According to information theory, the symbols aO,...-an-l(7
)% occurrence probability is PO,...tf'n-I, then the amount of information per symbol is given by l(). H bits per pixel is the reduction limit in information theory, and this is realized when the 8-word length/i of symbol a4 can be set as Ji=-10g2Pi (btu).

第１図は注目画素をＸとする時、注目画素Ｘと参照する
価値の高い近隣画素Ａ、　　Ｂ、　　Ｃ，Ｄとの相対位
置関係を示す図である。FIG. 1 is a diagram showing the relative positional relationship between the pixel of interest X and neighboring pixels A, B, C, and D that are of high reference value, when the pixel of interest is X.

同図において、１画素のとるレベルをＯ〜１５の１６通
りとし、参照画素としてＡ、　　Ｈの２画素を選んだ時
、Ａ、　　Ｂの値に対する注目画素Ｘの濃度レベル値の
頻度順位、及びその確率の一部を第２図に示す。In the figure, when there are 16 levels from O to 15 that one pixel can take, and two pixels A and H are selected as reference pixels, the frequency ranking of the density level value of the target pixel X with respect to the values of A and B, and Part of the probability is shown in Figure 2.

第２図より、例えばＡ、、、Ｑ、Ｂ＝Ｑの状態では予測
順位が０位の確率は約９１％で、予測順位０位のシンボ
ルには１ビツトか或はランレングス符号化等を用いて１
ビツト以下に対する符号語長を刷り当てる必要がある。From Figure 2, for example, in the state of A, , Q, B = Q, the probability that the prediction rank is 0 is about 91%, and the symbol with the prediction rank 0 is encoded with 1 bit or run-length encoding. using 1
It is necessary to specify the code word length for bits or less.

一方、Ａ−２，Ｂ＝８の状態では予測順位が０位の確率
は約２５％で、予測順位０位のシンボルには２ビット程
度の′符号語を削り当てる必要がある。On the other hand, in the state where A-2, B=8, the probability that the prediction rank is 0 is about 25%, and it is necessary to shave off about 2 bits of the ' code word for the symbol with the 0th prediction rank.

このように、各予測順位の出現確率は参照画素のとる状
態によって異なるため、状態によって異なる符号を用い
るのが望ましいが、状態数はレベＸｎ ル政を２、参照画素数をｎとして２　　あるため、すべ
ての状態位に異なる符号を用いると、装置は極めて複雑
に７よる。In this way, the probability of appearance of each prediction rank differs depending on the state of the reference pixel, so it is desirable to use a different code depending on the state, but since the number of states is 2, where the level is 2 and the number of reference pixels is n. , using different signs for all state positions makes the device extremely complex.

本発明は上記のような従来のものの問題点に鑑みてなさ
れたもので、参照画素パターンによって注目画素の各予
測順位値のとる確率が異なることに看目し、参照画素の
とりうる状態数よ多少ない故のモードを考え、各状態が
属すべきモードの情報は送受両側で有し、各モード毎に
そのモードに適した符号を用いて予測順位値を符号化す
ることにより、情報源の性質に応じた符号化が可能とな
り短い時間で伝送を行なうことのできる画像符号化装置
を提供することを目的としている。The present invention has been made in view of the problems of the conventional ones as described above, and takes into account that the probability of each prediction rank value of a pixel of interest differs depending on the reference pixel pattern, and the number of possible states of the reference pixel is Considering the mode in which each state should belong, both the sending and receiving sides have information on the mode to which each state belongs, and by encoding the predicted rank value for each mode using a code suitable for that mode, the nature of the information source can be determined. It is an object of the present invention to provide an image encoding device that can perform encoding according to the image quality and can perform transmission in a short time.

以下、本発明の一実施例を図について説明する。Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

各状態に於ける各予測順位値の出現確率をしらべると、
注目画素に隣接するいくつかの参照画素のとる値が等し
いとかレベル差の小さ１時は、画像の平坦部に当たって
おり、ここでは画素間の相関が強く比較的１画素当たり
のエントロピが小さい。一方、参照画素のとる値がばら
ついている時は画素間の相関が弱く、比較的１画素当た
りのエントロピが大きい。Examining the probability of appearance of each predicted rank value in each state,
When the values of some reference pixels adjacent to the pixel of interest are the same or the level difference is small, this corresponds to a flat part of the image, where the correlation between pixels is strong and the entropy per pixel is relatively small. On the other hand, when the values taken by reference pixels vary, the correlation between pixels is weak and the entropy per pixel is relatively large.

そのため、本発明の一実施例では注目画素の直上画素Ｂ
とすぐ左の画素人の信号レベルとを比較し、その差が０
か或いは比較的小さい値であればそのモードをＳ　（Ｓ
ｔｒｏｎｇ；相関が強い〕モードとし、そうでない時を
Ｗ（Ｗｅａｋ；相関が弱い）モードとしている。この両
モードの境となるレベル差は原信号のもつレベル攻２　
と関連があり、例えば那＝４であれば０とし、ｓ＝７で
あれば±３というように設定する。また本発明の他の実
施例では、更に注目画素の右斜め上の画素りも考慮に入
れてモードを決定しているが、これは、画像の標本化密
度と関連しておシ、ある程度標本化密度が細かいと、画
素りも考慮に入れる必要があることを示している。Therefore, in one embodiment of the present invention, the pixel B immediately above the pixel of interest
and the signal level of the pixel immediately to the left, and the difference is 0.
or if the value is relatively small, the mode is set to S (S
When this is not the case, the W (weak) mode is used. The level difference between these two modes is the level attack 2 of the original signal.
For example, if n=4, it is set to 0, and if s=7, it is set to ±3. In other embodiments of the present invention, the mode is determined by taking into consideration the pixel diagonally above and to the right of the pixel of interest, but this is to some extent related to the sampling density of the image. If the density is fine, this indicates that the pixel size must also be taken into account.

第３図は標本化密度８×８（股−）、ｍ：＝４でＡ＝Ｂ
＝ＤをＳモード、それ以外をＷモードとした時の両モー
ドの各順位値の出現確率例であり、この場合各モード毎
に異なる符号を適用するとして、２モードに分離しない
場合よ９約ｌθ％エントロピを低下させうる。Figure 3 shows sampling density 8 x 8 (crotch), m:=4, and A=B.
= This is an example of the appearance probability of each rank value of both modes when D is S mode and other modes are W mode. In this case, assuming that a different code is applied to each mode, it is about 9 The lθ% entropy can be lowered.

このように両モードに分離した場合、その符号化信号の
送出形式が問題となるが、まずランレングス符号化を行
なわないのであれば、モードを示すだめの信号は、その
必要がなく、受信側では各画素を復元するごとに次の画
素の属するモードがわかり、従って使用されている符号
もわかるため、次の符８語の復号が可能となる。また、
ランレングス符号化を用いるには一方のモードの複数の
順位値が同時に符号化されることになるわけであるが、
復号された画素を複数の長いレジスタに蓄積すればまわ
りの画素の状態からモードが分か如、やはり特に区別す
るための信号は不要である。受信側では復号されだ復改
の順位値をレジスタ等に蓄積しておいて適宜設定すれば
各画素を順次復元でき、次の画素の属するモードもわか
るため符号語の復８は常に可能となる。When separating into both modes in this way, the transmission format of the encoded signal becomes a problem, but if run-length encoding is not performed first, there is no need for a signal indicating the mode, and the receiving side In this case, each time each pixel is restored, the mode to which the next pixel belongs is known, and therefore the code used is also known, so that the next eight words can be decoded. Also,
When using run-length encoding, multiple rank values of one mode are encoded at the same time.
If decoded pixels are stored in a plurality of long registers, the mode can be determined from the states of surrounding pixels, and no special signal is required to distinguish them. On the receiving side, each pixel can be sequentially restored by storing the decoded and restoring rank values in a register or the like and setting them appropriately, and since the mode to which the next pixel belongs can also be known, decoding of the code word is always possible. .

第４図に本発明における画像符号化装置を含む送受信側
のブロック図を示す。図において、＋４１）は予測変換
表を記憶している予測変換器で、注目画素Ｘの濃度レベ
ル信号を予測順位値Ｃに変換する。FIG. 4 shows a block diagram of the transmitting and receiving side including the image encoding device according to the present invention. In the figure, +41) is a prediction converter that stores a prediction conversion table and converts the density level signal of the pixel of interest X into a prediction rank value C.

また（儲はモード信号発生器であり、画素メモリ（４３
より出力される画像信号Ａ、　　Ｂの濃度パターンに応
じて上記予測順位威の属するモードを示す信号Ｍを発生
する。（４５）はＳモードの符号器、１４６）はＷモー
ドの符号器であり、予測順位値Ｃは上記モードＭ″８Ｍ
に従ってそのいずれかに入力される。＋４７）　＃ｉ伝
送符Ｊｉｆｊ語選択器で、受信側で復号可能なように上
記モード信号Ｍに応じて両モードの符号語送出順序を制
御する。Ｓｔ＋は受信信バッファで、遂次入力されるモ
ード指示信Ｊ８Ｍに従い、Ｓモード復号器□□□、Ｗモ
ード復号器Ｑのどちらかへ受信信号を送る。−は切換器
で、復号された予測順位値Ｃを予測逆変換器−に送り、
該逆変換器時で再生イ目８ｘか得られる。（５ηは画素
メモリで、既に復元ずド信号発生器印に送る。両モード
復号器輸、關の内部には復号された予測順位値を保つレ
ジスタを有しており、ランレングス符号化の場合も復号
可能としている。In addition, the pixel memory (43
A signal M indicating the mode to which the predicted ranking belongs is generated in accordance with the density patterns of the image signals A and B outputted from the image signals A and B. (45) is an S mode encoder, 146) is a W mode encoder, and the prediction rank value C is the above mode M″8M
It is entered into one of them according to the following. +47) The #i transmission code Jifj word selector controls the code word transmission order of both modes according to the mode signal M so that it can be decoded on the receiving side. St+ is a reception signal buffer, which sends a reception signal to either the S mode decoder □□□ or the W mode decoder Q according to the mode instruction signal J8M that is inputted successively. - is a switch that sends the decoded prediction rank value C to the prediction inverse transformer -;
When using the inverse converter, a reproduction number of 8x can be obtained. (5η is a pixel memory, which is sent to the signal generator without being restored.In both mode decoders, there is a register inside the gate that holds the decoded prediction rank value, and in the case of run-length encoding, can also be decrypted.

次に動作について説明する。Next, the operation will be explained.

以上のような構成になる本装置では、予測変換器（４Ｎ
）は参照画素Ａ、Ｈの濃度レベル信号に応じて注目画素
Ｘの濃度レベル信号を予測順位値Ｃに変換し、モード信
号発生器（儲は上記両画索Ａ、Ｈの濃度パターンにより
決まる予測順位値Ｃ（Ｄ属するモードを示すモード信８
Ｍを出力する。そして切換器（伯はモードＭＵＭにより
予測順位値ＣをＳモード符号器（碕又はＷモード符号器
（４６）の一方に入力し、符号語選択器（４７１は両モ
ード符号器卿■のうち一方の出力を伝送路−に送出する
。In this device configured as above, a predictive converter (4N
) converts the density level signal of the pixel of interest X into a predicted ranking value C according to the density level signals of the reference pixels A and H, Ranking value C (Mode signal 8 indicating the mode to which D belongs)
Output M. Then, the predicted rank value C is inputted to one of the S-mode encoder (碕 or W-mode encoder (46)) by the switcher (mode MUM), and the code word selector (471 is one of the two mode encoders). The output of is sent to the transmission line -.

一方、受信側では既に復号、逆変換済みの画素信号Ａ、
Ｂに応じてモード信号発生器（至）はモード信号Ｍを発
生し、受信信号バッフ１６Ｄはモード指示信′８Ｍに従
い受信信号をＳモード復号器＠またはＷモード復号器−
のどちらかへ送る。切換器（財）は復号された予測順位
値Ｃを予測逆変換器ωに送し、該逆変換器（至）で再生
信号Ｘが得られる。On the other hand, on the receiving side, the pixel signal A, which has already been decoded and inversely transformed,
The mode signal generator (to) generates a mode signal M in accordance with the mode instruction signal '8M, and the receiving signal buffer 16D outputs the received signal to the S mode decoder @ or the W mode decoder - in accordance with the mode instruction signal '8M.
Send it to either. The switch sends the decoded prediction rank value C to the prediction inverse transformer ω, and the reproduced signal X is obtained by the inverse transformer ω.

以上のように本発明にすれば、参照画素パターンによっ
て注目画素の各予測順位値のとる確率が異なることに看
目し、参照画素のとシうる状態数より少ない数のモード
を考え、各状態が属すべきモードの情報は送受両側で有
し、各モード毎にそのモードに適し九符号を用いて予測
順位値を符号化するようにしたので、情報源の性質に応
じた符号化が可能となり、伝送時間の短縮が可能となる
効果がある。As described above, according to the present invention, it is noted that the probability of each prediction rank value of the target pixel differs depending on the reference pixel pattern, and a mode with a smaller number than the possible states of the reference pixel is considered, and each state is Information on the mode to which the information belongs is stored on both the transmitting and receiving sides, and the predicted rank value is encoded using a nine-code code suitable for each mode, making it possible to encode according to the nature of the information source. This has the effect of reducing transmission time.

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

第１図は画素配置を示す図、第２図は参照画素のとる値
に対して予測順位の高い順１こＸの値を並べたもの及び
その確率を示したものの一部の表を示す図、第３図は両
モードに於ける各予測順位値の出現確率を示す図、第４
図は本発明の一実施例Ｊとよる画像符号化装置のブロッ
ク図である。 ＋４１１は予測変換器、（４２はモード信号発生器、＋
ａは画素メモリ、（偵は切換器、＋４５１．１４ｆＤは
Ｓモード符号器、Ｗモード符号器（復改の符号器）、（
４ηは伝送符号語選択器、姉は受信信号バッファ、（（
支）はＳモード復号器、（至）はＷモード復号器、−は
切換器、州は予測逆変換器、■はモード信号発生器、１
５りは画素メモリ２Ｘは注目画素、Ａ、Ｂ、Ｄは参照画
素である。 なお図中、同一符号は同−又は相当部分を示す。 代　　理　　人　　　　　　　葛　　野　　信　　−手
続補正書（自発） 特許庁長官殿 １、事件の表示　　　　特願昭　５７−１４１４７３号
２、発明の名称 画像符号化装置 ３、補正をする者 三菱電機株式会社内 氏　名（６６９９）　　　弁理士　葛　　野　　信　　
−【連え３先０３（２１，３’）３４２１１ｉ匁ｍ部）
（］） ５、補正の対象 明細書の発明の詳細な説明の欄 ６、補正の内容 明細書をつぎのとおり訂正する。Figure 1 is a diagram showing the pixel arrangement, and Figure 2 is a diagram showing a part of the table showing the values of the reference pixel in descending order of prediction rank and their probabilities. , Figure 3 is a diagram showing the appearance probability of each predicted rank value in both modes, and Figure 4 is a diagram showing the appearance probability of each predicted rank value in both modes.
The figure is a block diagram of an image encoding device according to an embodiment J of the present invention. +411 is a predictive converter, (42 is a mode signal generator, +
a is a pixel memory;
4η is the transmission code word selector, the older sister is the reception signal buffer, ((
(branch) is S mode decoder, (to) is W mode decoder, - is switch, state is predictive inverse converter, ■ is mode signal generator, 1
5, the pixel memory 2X is the pixel of interest, and A, B, and D are reference pixels. In the drawings, the same reference numerals indicate the same or equivalent parts. Agent Makoto Kuzuno - Procedural amendment (voluntary) Commissioner of the Japan Patent Office 1. Indication of the case: Japanese Patent Application No. 57-141473 2. Name of the invention: Image coding device 3. Person making the amendment: Mr. Uchi of Mitsubishi Electric Corporation Name (6699) Patent attorney Makoto Kuzuno
- [3rd row 03 (21, 3') 34211i momme part)
(]) 5. Column 6 of the detailed description of the invention in the specification to be amended, the description of the contents of the amendment, is corrected as follows.

Claims (1)

【特許請求の範囲】 （１）復改の参照画素の濃度レベル信号に対して注目画
素の予測順位値を定めている予測順位表を有し該予測順
位表の内容に従って上記注目画素の濃度レベル状態を予
測順位値に変換する予測変換器と、上記複数の参照画素
の濃度パターンに応じて上記予測順位値の属するモード
を示すモード信号を発生するモード信号発生器と、該モ
ード信号発生器の出力が示すモードに応じ各モードに適
した符号を用いて上記予測順位値を符号化する複数の符
８器とを備えたことを特徴とする画像符号化装置。 等しいかその差が一定値以下である場合とそうでない場
合とで異なるモード信号を発生するものであることを特
徴とする特ｒｆ請求の範囲第１項記載の画像符号化装置
。 （３）　　上記モード信号発生器が、上記注目画素の左
隣の参照画素と該注目画素の真上の参照画素と該注目画
素の右上の参照画素とが等しいかその差が一定値以下で
ある場合と、そうでない場合とで、異なるモード信号を
発生するものであることを特徴とする特許請求の範囲第
１項記載の画像符号化装置。[Scope of Claims] (1) A prediction ranking table is provided that determines the predicted ranking value of the pixel of interest with respect to the density level signal of the reference pixel for restoration, and the density level of the pixel of interest is determined according to the contents of the prediction ranking table. a prediction converter that converts a state into a predicted rank value; a mode signal generator that generates a mode signal indicating a mode to which the predicted rank value belongs according to the density pattern of the plurality of reference pixels; An image encoding device comprising: a plurality of encoders that encode the predicted rank values using codes suitable for each mode according to the mode indicated by the output. 2. The image encoding device according to claim 1, wherein different mode signals are generated depending on whether or not the difference is equal to or less than a certain value. (3) The mode signal generator determines whether the reference pixel to the left of the pixel of interest, the reference pixel directly above the pixel of interest, and the reference pixel on the upper right of the pixel of interest are equal or the difference is less than or equal to a certain value. 2. The image encoding device according to claim 1, wherein different mode signals are generated depending on whether the image is encoded or not.
JP57141473A 1982-08-12 1982-08-12 Device for encoding picture Granted JPS5930366A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57141473A JPS5930366A (en) 1982-08-12 1982-08-12 Device for encoding picture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57141473A JPS5930366A (en) 1982-08-12 1982-08-12 Device for encoding picture

Publications (2)

Publication Number Publication Date
JPS5930366A true JPS5930366A (en) 1984-02-17
JPH0214830B2 JPH0214830B2 (en) 1990-04-10

Family

ID=15292699

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57141473A Granted JPS5930366A (en) 1982-08-12 1982-08-12 Device for encoding picture

Country Status (1)

Country Link
JP (1) JPS5930366A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6188793B1 (en) 1996-03-19 2001-02-13 Mitsubishi Denki Kabushiki Kaisha Encoding apparatus, decoding apparatus, encoding method and decoding method
US6636641B1 (en) 1996-03-19 2003-10-21 Mitsubishi Denki Kabushiki Kaisha Encoding apparatus, decoding apparatus, encoding method and decoding method
US6744925B2 (en) 1996-03-19 2004-06-01 Mitsubishi Denki Kabushiki Kaisha Encoding apparatus, decoding apparatus, encoding method, and decoding method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5624877A (en) * 1979-08-06 1981-03-10 Nec Corp Coder for multi-video signal
JPS5673975A (en) * 1979-11-20 1981-06-19 Nec Corp Coding and decoding system for multivalue video signal and its device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5624877A (en) * 1979-08-06 1981-03-10 Nec Corp Coder for multi-video signal
JPS5673975A (en) * 1979-11-20 1981-06-19 Nec Corp Coding and decoding system for multivalue video signal and its device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6188793B1 (en) 1996-03-19 2001-02-13 Mitsubishi Denki Kabushiki Kaisha Encoding apparatus, decoding apparatus, encoding method and decoding method
US6636641B1 (en) 1996-03-19 2003-10-21 Mitsubishi Denki Kabushiki Kaisha Encoding apparatus, decoding apparatus, encoding method and decoding method
US6744925B2 (en) 1996-03-19 2004-06-01 Mitsubishi Denki Kabushiki Kaisha Encoding apparatus, decoding apparatus, encoding method, and decoding method
US6754393B2 (en) 1996-03-19 2004-06-22 Mitsubishi Denki Kabushiki Kaisha Encoding apparatus, decoding apparatus, encoding method, and decoding method

Also Published As

Publication number Publication date
JPH0214830B2 (en) 1990-04-10

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