JPH0316490A - Moving picture encoder - Google Patents

Moving picture encoder

Info

Publication number
JPH0316490A
JPH0316490A JP1151830A JP15183089A JPH0316490A JP H0316490 A JPH0316490 A JP H0316490A JP 1151830 A JP1151830 A JP 1151830A JP 15183089 A JP15183089 A JP 15183089A JP H0316490 A JPH0316490 A JP H0316490A
Authority
JP
Japan
Prior art keywords
moving
block
quantization
characteristic
motion vector
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
JP1151830A
Other languages
Japanese (ja)
Inventor
Ikuo Yasuda
育生 安田
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP1151830A priority Critical patent/JPH0316490A/en
Publication of JPH0316490A publication Critical patent/JPH0316490A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To suppress the visual distortion of reproduced picture quality by providing a means setting a rough quantization characteristic when a moving vector detection means decides it that the block is moved and setting a dense quantization characteristic when the moving vector detection means decides it that the block is not moving. CONSTITUTION:A quantization controller 9a selects the characteristic of a quantizer 6 including a quantization step size in response to a residual coding data stored in a buffer 8 and sets a dense quantization characteristic to a not moving block when information of a moving vector form a moving vector detector 2a is invalid, and sets a rough quantization characteristic to a moving block when information of a moving vector from the moving vector 2a is valid on the other hand. When the quantizer 6 applies the not moving block with the dense quantizing characteristic, the resolution is increased to suppress the deterioration in the reproduction picture quality and when the quantizer 6 applies the moving block with the rough quantizing characteristic, the quantity of codes outputted from a coder 7 is suppressed.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、テレビ電話やテレビ会議等の画像通信に利用
する動画像符号化装置に関する。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a moving image encoding device used for image communication such as video telephones and video conferences.

従来の技術 第2図は、従来の動画像符号化装置の構成を示している
BACKGROUND ART FIG. 2 shows the configuration of a conventional moving image encoding device.

第2図において、画像人力端子1からディジタル画像信
号が入力すると、動ベクトル検出器2は、このディジタ
ル画像信号と、フレームメモリ3からの前フレームの画
像信号(再生画素値)により動ベクトルを検出し、予測
器4は、画像人力端子1からのディジタル画像信号と、
動ベクトル検出器2からの動ベクトルと、フレームメモ
リ3からの再生画素値により予測誤差を算出し、直交変
換器5は、この予測誤差をM画素XNラインのブロック
単位に直交変換する。
In FIG. 2, when a digital image signal is input from the image input terminal 1, the motion vector detector 2 detects a motion vector based on this digital image signal and the image signal (reproduced pixel value) of the previous frame from the frame memory 3. The predictor 4 receives the digital image signal from the image input terminal 1,
A prediction error is calculated using the motion vector from the motion vector detector 2 and the reproduced pixel value from the frame memory 3, and the orthogonal transformer 5 orthogonally transforms this prediction error in units of blocks of M pixels x N lines.

量子化器6は、この直交変換係数を量子化制御器9によ
り選択された量子化特性で量子化し、符号化器7は、こ
の量子化された直交変換係数を2次元の可変長符号に変
換し、バッフ78は、この可変長符号を伝送速度に応じ
て一時蓄積し、回線に送出する。量子化制御器9は、バ
ッファ8に蓄積された残留符号化データに応じて、量子
化のステップサイズを含む量子化器6の特性を選択する
The quantizer 6 quantizes this orthogonal transform coefficient with the quantization characteristic selected by the quantization controller 9, and the encoder 7 converts the quantized orthogonal transform coefficient into a two-dimensional variable length code. However, the buffer 78 temporarily stores this variable length code according to the transmission speed and sends it out to the line. The quantization controller 9 selects the characteristics of the quantizer 6 including the quantization step size according to the residual encoded data stored in the buffer 8.

尚、量子化器6により量子化された直交変換係数は、逆
量子化器1oにより直交変換係数に逆量子化され、この
直交変換係数は、逆直交変換器11により予測誤差に再
生され、フレームメモリ3に格納される。
The orthogonal transform coefficients quantized by the quantizer 6 are inversely quantized into orthogonal transform coefficients by the inverse quantizer 1o, and these orthogonal transform coefficients are regenerated into prediction errors by the inverse orthogonal transformer 11, and the frames are It is stored in memory 3.

発明が解決しようとする課題 しかしながら、上記従来の動画像符号化装置では、動ベ
クトルが有効であるかすなわち画像が動いているか、又
は動ベクトルが無効であるかすなわち画像が動いていな
いかにかかわらず、同一の量子化特性で量子化するので
、動ベクトルが無効、すなわち画像が動いていないと判
定されたブロックの量子化特性が粗くなり、したがって
、再生画質の視覚上の歪みか顕著となるという問題点が
ある。
Problems to be Solved by the Invention However, in the conventional video encoding device described above, regardless of whether the motion vector is valid, that is, the image is moving, or whether the motion vector is invalid, that is, the image is not moving. Since quantization is performed using the same quantization characteristics, the quantization characteristics of blocks determined to have invalid motion vectors, that is, the image is not moving, will be coarse, resulting in noticeable visual distortion of the reproduced image quality. There is a problem.

本発明は上記従来例の問題点に鑑み、再生画質の視覚上
の歪みを抑圧することができる動画像符号化装置を提供
することを目的とする。
SUMMARY OF THE INVENTION In view of the problems of the prior art described above, it is an object of the present invention to provide a video encoding device that can suppress visual distortion in reproduced image quality.

課題を解決するための手段 本発明は上記目的を達成するために、動画像信号のフレ
ーム間の動ベクトルを検出するとともに、この動ベクト
ルによりそのブロックが動いているか否かを判定し、そ
のブロックが動いていると判定した場合に粗い量子化特
性を設定し、そのブロックが動いていないと判定した場
合に密の量子化特性を設定し、この量子化特性で直交変
換係数を量子化するようにしたものである。
Means for Solving the Problems In order to achieve the above object, the present invention detects a motion vector between frames of a moving image signal, determines whether or not the block is moving based on this motion vector, and determines whether or not the block is moving. If it is determined that the block is moving, set a coarse quantization characteristic, and if it is determined that the block is not moving, set a fine quantization characteristic, and use this quantization characteristic to quantize the orthogonal transform coefficients. This is what I did.

作用 本発明は上記構成により、画像が動いていないブロック
の直交変換係数を密の量子化特性で量子化するので、再
生画質の視覚上の歪みを抑圧することができる。
Effect: With the above configuration, the present invention quantizes the orthogonal transform coefficients of blocks in which the image is not moving using a dense quantization characteristic, so that visual distortion in reproduced image quality can be suppressed.

実施例 以下、図面を参照して本発明の実施例を説明ずる。第1
図は、本発明に係る動画像符号化装置の一実施例を示す
ブロック図である。
Embodiments Hereinafter, embodiments of the present invention will be explained with reference to the drawings. 1st
FIG. 1 is a block diagram showing an embodiment of a video encoding device according to the present invention.

第1図において、1は、ディジタル画像信号の入力端子
、2aは、人力端子1からのディジタル画像信号と、フ
レームメモリ3からの前フレームの画像信号(再生画素
値)により動ベクトルを検出するとともに、この動ベク
トルが有効であるかすなわち画像が動いているか、又は
この動ベクトルが無効であるかすなわち画像が動いてい
ないかを判別し、この動ベクトル値と有効又は無効情報
を出力する動ベクトル検出器である。
In FIG. 1, 1 is an input terminal for a digital image signal, and 2a is a digital image signal from the human input terminal 1 and the image signal (reproduced pixel value) of the previous frame from the frame memory 3 to detect a motion vector. , a motion vector that determines whether this motion vector is valid, that is, the image is moving, or whether this motion vector is invalid, that is, the image is not moving, and outputs this motion vector value and valid or invalid information. It is a detector.

4は、画像入力端子1からのディジタル画像信号と、動
ベクトル検出器2からの動ベクトルと、フレームメモリ
3からの再生画素値により予測誤差を算出する予測器、
5は、予測器4からの予測誤差をM画素×Nラインのブ
ロック単位に直交変換する直交変換器、6は、直交変換
器5により変換された直交変換係数を量子化制御器9a
により選択された量子化特性で量子化する量子化器、7
は、この量子化された直交変換係数を2次元の可変長符
号に変換する符号化器、8は、この可変長符号を伝送速
度に応じて一時v積し、回線に送出するバッフ7である
4 is a predictor that calculates a prediction error based on the digital image signal from the image input terminal 1, the motion vector from the motion vector detector 2, and the reproduced pixel value from the frame memory 3;
5 is an orthogonal transformer that orthogonally transforms the prediction error from the predictor 4 in block units of M pixels x N lines; 6 is a quantization controller 9a for orthogonal transform coefficients transformed by the orthogonal transformer 5;
a quantizer that quantizes with a quantization characteristic selected by 7;
is an encoder that converts this quantized orthogonal transform coefficient into a two-dimensional variable length code, and 8 is a buffer 7 that temporarily multiplies this variable length code according to the transmission speed and sends it to the line. .

10は、量子化器6により量子化された直交変換係数を
逆量子化する逆量子化器、11は、この直交変換係数を
予測誤差に再生してフレームメモリ3に格納するための
逆直交変換器である。
10 is an inverse quantizer that inversely quantizes the orthogonal transform coefficients quantized by the quantizer 6; 11 is an inverse orthogonal transformer that reproduces the orthogonal transform coefficients into prediction errors and stores them in the frame memory 3; It is a vessel.

次に、上記実施例の動作、特に量子化制御器9aの動作
を説明する。
Next, the operation of the above embodiment, particularly the operation of the quantization controller 9a, will be explained.

第1図において、画像人力端子1からディジタル画像信
号が人力すると、動ベクトル検出器2aは、このディジ
タル画像信号と、フレームメモリ3からの前フレームの
画像信号(再生画素値)により動ベクトルを検出してこ
の動ベクトルか有効であるかすなわち画像が動いている
か、又はこの動ベクトルが無効であるかすなわち画像が
動いていないかを判別し、無効情報又は有効情報を量子
化制御器9aに出力する。
In FIG. 1, when a digital image signal is manually input from the image input terminal 1, the motion vector detector 2a detects a motion vector based on this digital image signal and the image signal (reproduced pixel value) of the previous frame from the frame memory 3. to determine whether this motion vector is valid, that is, the image is moving, or whether this motion vector is invalid, that is, the image is not moving, and outputs invalid information or valid information to the quantization controller 9a. do.

量子化制御器9aは、バッファ8に蓄積された残留符号
化データに応じて、量子化のステップサイズを含む量子
化器6の特性を選択するとともに、動ベクトル検出器2
aからの動ベクトル値の情報が無効である場合、すなわ
ち、動きがないブロックに対して量子化特性を密にし、
他方、動ベクトル検出器2aからの動ベクトル値の情報
が有効である場合には量子化特性を粗くする。
The quantization controller 9a selects the characteristics of the quantizer 6 including the quantization step size according to the residual encoded data accumulated in the buffer 8, and also selects the characteristics of the quantizer 6 including the quantization step size.
If the motion vector value information from a is invalid, that is, the quantization characteristics are made denser for blocks with no motion,
On the other hand, if the motion vector value information from the motion vector detector 2a is valid, the quantization characteristics are made coarser.

したがって、量子化器6が、動きがないブロックに対し
て密の量子化特性により量子化すると、解像度を上げて
再生画質の劣化を抑圧することができ、動きのあるブロ
ックに対して粗の量子化特性により量子化すると、符号
化器7が出力する符号量を抑圧することができる。
Therefore, when the quantizer 6 quantizes a block with no movement using a fine quantization characteristic, it is possible to increase the resolution and suppress deterioration of the reproduced image quality, and when a block with movement is quantized using a coarse quantization characteristic. By quantizing using the encoding characteristic, the amount of code output by the encoder 7 can be suppressed.

発明の効果 以上説明したように、本発明は、動画像信号のフレーム
間の動ベクトルを検出するとともに、この動ベクトルに
よりそのブロックが動いているか否かを判定し、そのブ
ロックが動いていると判定した場合に粗い量子化特性を
設定し、そのブロックが動いていないと判定した場合に
密の量子化特性を設定し、この量子化特性で直交変換係
数を量子化するようにしたので、再生画質の視覚上の歪
みを抑圧することができる。
Effects of the Invention As explained above, the present invention detects a motion vector between frames of a video signal, determines whether or not the block is moving based on this motion vector, and determines whether the block is moving. When it is determined that the block is not moving, a coarse quantization characteristic is set, and when it is determined that the block is not moving, a fine quantization characteristic is set, and the orthogonal transform coefficients are quantized with this quantization characteristic, so the playback Visual distortion of image quality can be suppressed.

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

第1図は、本発明に係る動画像符号化装置の一実施例を
示すブロック図、第2図は、従来の動画像符号化装置を
示すブロック図である。 2a・・・動ベクトル検出器、3・・・フレームメモリ
、4・・・予測器、5・・・直交変換器、6・・・量子
化器、9a・・・量子化制御器。
FIG. 1 is a block diagram showing an embodiment of a video encoding device according to the present invention, and FIG. 2 is a block diagram showing a conventional video encoding device. 2a... Motion vector detector, 3... Frame memory, 4... Predictor, 5... Orthogonal transformer, 6... Quantizer, 9a... Quantization controller.

Claims (1)

【特許請求の範囲】 動画像信号のフレーム間の動ベクトルを検出するととも
に、この動ベクトルによりそのブロックが動いているか
否かを判定する動ベクトル検出手段と、 動画像信号と前記動ベクトルにより予測誤差を算出する
予測手段と、 前記予測誤差を直交変換する手段と、 前記動ベクトル検出手段がそのブロックが動いていると
判定した場合に粗い量子化特性を設定し、そのブロック
が動いていないと判定した場合に密の量子化特性を設定
する手段と、 前記設定手段により設定された量子化特性で、前記直交
変換手段により変換された係数を量子化する手段とを有
する動画像符号化装置。
[Scope of Claims] Motion vector detection means for detecting a motion vector between frames of a video signal and determining whether or not the block is moving based on this motion vector; a prediction means for calculating an error; a means for orthogonally transforming the prediction error; and a coarse quantization characteristic set when the motion vector detection means determines that the block is moving; A video encoding device comprising: means for setting a dense quantization characteristic when a determination is made; and means for quantizing the coefficients transformed by the orthogonal transform means using the quantization characteristic set by the setting means.
JP1151830A 1989-06-14 1989-06-14 Moving picture encoder Pending JPH0316490A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1151830A JPH0316490A (en) 1989-06-14 1989-06-14 Moving picture encoder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1151830A JPH0316490A (en) 1989-06-14 1989-06-14 Moving picture encoder

Publications (1)

Publication Number Publication Date
JPH0316490A true JPH0316490A (en) 1991-01-24

Family

ID=15527243

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1151830A Pending JPH0316490A (en) 1989-06-14 1989-06-14 Moving picture encoder

Country Status (1)

Country Link
JP (1) JPH0316490A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5929930A (en) * 1994-07-05 1999-07-27 Canon Kabushiki Kaisha Image processing apparatus and method
WO2005081539A1 (en) * 2004-02-23 2005-09-01 Nec Corporation 2-dimensional signal encoding/decoding method and device
JP2010206618A (en) * 2009-03-04 2010-09-16 Seiko Epson Corp Image supply apparatus, image supply system, image supply method, and image supply program

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59141887A (en) * 1983-02-03 1984-08-14 Nec Corp Estimating and coding device of dynamic picture signal
JPH01141483A (en) * 1987-11-27 1989-06-02 Matsushita Electric Ind Co Ltd Compressing device for image signal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59141887A (en) * 1983-02-03 1984-08-14 Nec Corp Estimating and coding device of dynamic picture signal
JPH01141483A (en) * 1987-11-27 1989-06-02 Matsushita Electric Ind Co Ltd Compressing device for image signal

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5929930A (en) * 1994-07-05 1999-07-27 Canon Kabushiki Kaisha Image processing apparatus and method
WO2005081539A1 (en) * 2004-02-23 2005-09-01 Nec Corporation 2-dimensional signal encoding/decoding method and device
US8031951B2 (en) 2004-02-23 2011-10-04 Nec Corporation 2-dimensional signal encoding/decoding method and device
US8265402B2 (en) 2004-02-23 2012-09-11 Nec Corporation 2 dimensional signal encoding/decoding method and device
JP2010206618A (en) * 2009-03-04 2010-09-16 Seiko Epson Corp Image supply apparatus, image supply system, image supply method, and image supply program

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