【０００１】[0001]
【産業上の利用分野】本発明は、画像蓄積通信装置に関
し、より詳細には、センタ蓄積装置において、映像復号
手段で受信した符号化映像を逐次復号し、復号された映
像フレーム／フィールド（以下、簡単のため、単にフレ
ームと称す）を符号化手段でフレーム内モードのみで符
号化して蓄積することにより、早送りなどの特殊作成を
可能とする画像蓄積通信装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image storage / communication device, and more particularly to a center storage device for sequentially decoding encoded video received by video decoding means and decoding decoded video frames / fields (hereinafter , For simplicity, is simply referred to as a frame) by an encoding means and encoded and stored only in the in-frame mode, thereby enabling a special creation such as fast-forwarding.
【０００２】[0002]
【従来の技術】近年、ＩＳＤＮ（Ｉntegrated Ｓervice
s Ｄigital Ｎetwork；サービス総合ディジタル網）等
のディジタル通信網の整備・普及と、画像処理技術の進
歩及び高速ディジタル信号処理技術の発展によって、画
像通信サービスの実現に対する要求が高まっている。画
像通信サービスの代表的なものとしては、テレビ電話サ
ービスやテレビ会議サービス等のリアルタイムな通信サ
ービスがあり、既に利用されているが、不特定多数のユ
ーザに対して不特定時の情報を提供する蓄積系の画像通
信サービスも実現しつつある。2. Description of the Related Art In recent years, ISDN (Integrated Service)
The demand for the realization of image communication services is increasing due to the development and spread of digital communication networks such as s Digital Network (service integrated digital network), the progress of image processing technology, and the development of high-speed digital signal processing technology. A typical image communication service is a real-time communication service such as a videophone service or a videoconference service, which is already in use, but provides information at unspecified times to an unspecified number of users. Storage-based image communication services are also being realized.
【０００３】図６は、蓄積系サービスを提供する従来の
画像蓄積通信装置の構成図で、図中、６１は画像蓄積通
信装置、６２は画像蓄積部、６３は通信制御部、６４は
受信部、６５は送信部、６６は通信回線、６７-1〜６７
-nは端末装置である。端末装置６７-1〜６７-nで符号化
された画像データは、通信回線６６を介して画像蓄積通
信装置６１の受信部６４に伝送される。該受信部６４で
は、受信した符号化画像データをフレーム単位に分割
し、画像蓄積部６２へ転送する。該画像蓄積部６２で
は、受信した符号化画像データを通信制御部６３からの
制御に従って蓄積する。前記画像蓄積通信装置は、オー
ディオビジュアル端末（以下、ＡＶ端末と称する）と接
続することを前提としているが、該ＡＶ端末はＩＴＵ−
Ｔ勧告に準拠して、映像情報の符号化は勧告Ｈ.２６１
の方式に統一されている。FIG. 6 is a block diagram of a conventional image storage / communication device for providing storage services. In the figure, 61 is an image storage / communication device, 62 is an image storage unit, 63 is a communication control unit, and 64 is a receiving unit. , 65 is a transmitter, 66 is a communication line, and 67-1 to 67
-n is a terminal device. The image data encoded by the terminal devices 67-1 to 67-n is transmitted to the receiving unit 64 of the image storage communication device 61 via the communication line 66. The receiving unit 64 divides the received encoded image data into frame units and transfers the divided image data to the image storage unit 62. The image storage unit 62 stores the received encoded image data under the control of the communication control unit 63. The image storage communication device is premised to be connected to an audiovisual terminal (hereinafter referred to as an AV terminal).
According to the T recommendation, the encoding of the video information is recommended H.261.
It is unified in the method of.
【０００４】蓄積系の画像通信サービスでは、そのアプ
リケーションの性質から、蓄積データの早送り／早戻し
再生の機能が用意されていると便利である。しかし、勧
告Ｈ.２６１に従って符号化された映像データは、通常
フレーム間符号化されているため、画像フレーム間の差
分情報で構成されている。これを蓄積して再生しようと
する場合、その先頭フレームのデータがフレーム間符号
化されていると、これを受信する端末装置側で画像フレ
ームとして復元できずにしばらくの間表示映像が乱れる
ことになるため、先頭フレームのデータはフレーム間符
号化（＝ＩＮＴＥＲ符号化）でなく、フレーム内符号化
（＝ＩＮＴＲＡ符号化）されたデータを蓄積する。ま
た、勧告Ｈ.２６１では符号化による誤差の累積を抑制
するための周期的リフレッシュが行われ、周期的にフレ
ーム内モードで動画像データの符号化が行われる。この
ことを利用して、フレーム内モードで符号化されたフレ
ームデータを先頭にしたデータ単位で蓄積し、その蓄積
データ単位の間隔で再生データを間引くことで、早送り
再生の実現が可能になる。In the storage-type image communication service, it is convenient that the function of fast-forwarding / fast-rewinding the stored data is prepared from the nature of the application. However, since the video data encoded according to Recommendation H.261 is usually interframe encoded, it is composed of difference information between image frames. When storing and reproducing this, if the data of the first frame is inter-frame coded, the terminal device receiving it cannot restore it as an image frame and the displayed image is disturbed for a while. Therefore, the data of the first frame is not the inter-frame coded (= INTER coded) but the intra-frame coded (= INTRA coded) data. Further, according to Recommendation H.261, periodic refresh is performed to suppress the accumulation of errors due to encoding, and moving image data is periodically encoded in the intraframe mode. By utilizing this fact, the frame data encoded in the intra-frame mode is accumulated in the beginning of the data unit, and the reproduction data is thinned out at intervals of the accumulated data unit, whereby the fast-forward reproduction can be realized.
【０００５】このような周期的リフレッシュを利用して
早送り再生を実現する画像蓄積通信装置に関しては、例
えば、特開平５−９１４９７号公報に記載されている。
この公報のものは、早送りなどの制御を行った場合で
も、必ず、フレーム内符号化したデータ、つまりフレー
ム間符号化の最初のフレームのデータからスタートで
き、映像データと音声データとの同期処理を保証するも
のである。An image storage communication device which realizes fast-forward reproduction by utilizing such periodic refresh is described in, for example, Japanese Patent Laid-Open No. 5-91497.
In the case of this publication, even when control such as fast-forwarding is performed, it is always possible to start from intra-frame coded data, that is, the first frame of inter-frame coding, and synchronize processing of video data and audio data. It is a guarantee.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、前述の
ような構成をとる蓄積データ中には、通常再生に必要な
データと早送り再生に必要なデータとが混在しているた
め、再生時に区別できるような蓄積制御とデータの管理
が必要であり、また、早送り再生時には蓄積データ中か
ら早送り再生用のデータのみを選択して読み出すような
再生制御が必要になり、蓄積時と再生時共にデータの管
理が煩雑になるという欠点があった。また、前述したよ
うに、周期的リフレッシュの処理は端末装置側に依存
し、端末装置によってフレーム内モードで符号化される
時間周期が異なるため、画像蓄積通信装置側では早送り
再生の速度を制御できないという欠点があった。However, since the data necessary for normal reproduction and the data necessary for fast-forward reproduction are mixed in the stored data having the above-mentioned structure, it is possible to distinguish them during reproduction. Storage control and data management are required, and playback control that selects and reads only the data for fast-forward playback from the stored data during fast-forward playback is required. There was a drawback that was complicated. Further, as described above, the cyclic refresh process depends on the terminal device side, and the time period encoded in the intraframe mode differs depending on the terminal device, so the image storage communication device side cannot control the speed of fast-forward reproduction. There was a drawback.
【０００７】本発明は、このような実情に鑑みてなされ
たもので、端末装置から受信した動画像データを蓄積
し、再生するときには通常の再生の他に早送り再生や早
戻し再生等の特殊再生を、使用する端末装置に依存せず
に任意の速度で行うことを可能とし、このための通常再
生用と特殊再生用の蓄積画像データの管理を簡便にする
ような蓄積手段及び再生手段を有する画像蓄積通信装置
を提供することを目的とする。The present invention has been made in view of such circumstances, and when the moving image data received from the terminal device is accumulated and reproduced, special reproduction such as fast-forward reproduction or fast-reverse reproduction is performed in addition to normal reproduction. Has a storage unit and a reproduction unit for simplifying the management of the stored image data for normal reproduction and special reproduction for this purpose, regardless of the terminal device used. An object is to provide an image storage communication device.
【０００８】[0008]
【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、（１）通信回線を通じて画像データの送
受を行う送信部及び受信部と、受信された画像データを
保存することができる第１の画像蓄積部と、前記各部を
制御して通信を行う通信制御部とを有する画像蓄積通信
装置において、前記受信部で受信した符号化画像データ
から、早送り等の特殊再生用の映像情報を生成する特殊
再生用映像生成部と、該特殊再生用映像生成部からの映
像情報を保存する第２の画像蓄積部とを備えること、更
には、（２）前記通信制御部の指示に応じて前記第１の
画像蓄積部と前記第２の画像蓄積部からの画像データの
呼び出しを制御する再生制御部を備え、通常再生と早送
り／早戻し再生を切り替えて行うことを可能としたこ
と、更には、（３）前記特殊再生用映像生成部は、前記
受信部からの符号化画像データを復元する映像復元部
と、該映像復元部で復元された映像情報をフレーム内モ
ードで符号化するフレーム内符号化部と、前記各部を制
御する特殊再生用映像生成制御部とから構成され、前記
特殊再生用映像生成制御部の指示により早送り／早戻し
再生用の映像情報を生成すること、更には、（４）前記
特殊再生用映像生成部が、前記受信部からの符号化画像
データを復元する映像復元部と、該映像復元部で復元さ
れた映像情報をフレーム間モードで符号化するフレーム
間符号化部と、前記各部を制御する特殊再生用映像生成
制御部とから構成され、前記特殊再生用映像生成制御部
の指示により早送り再生用の映像情報を生成すること、
更には、（５）前記特殊再生用映像生成部が、前記受信
部からの符号化画像データを復元する映像復元部と、該
映像復元部で復元された映像情報を静止画像符号化方式
で符号化する静止画像符号化部と、前記各部を制御する
特殊再生用映像生成制御部とから構成され、前記特殊再
生用映像生成制御部の指示により早送り／早戻し再生用
の映像情報を生成することを特徴としたものである。In order to achieve the above object, the present invention provides (1) a transmitting unit and a receiving unit for transmitting and receiving image data through a communication line, and storing the received image data. An image storage communication device having a first image storage unit capable of performing the communication and a communication control unit for controlling the respective units to perform communication, and a video for special reproduction such as fast-forwarding from the encoded image data received by the receiving unit. A special reproduction video generation unit for generating information; and a second image storage unit for storing the video information from the special reproduction video generation unit, and further (2) instructing the communication control unit. Accordingly, a reproduction control unit for controlling the calling of the image data from the first image storage unit and the second image storage unit is provided, and normal reproduction and fast forward / reverse reproduction can be switched and performed. , And (3) The special reproduction video generation unit includes a video restoration unit that restores the encoded image data from the reception unit, and an intraframe encoding unit that encodes the video information restored by the video restoration unit in the intraframe mode. A video reproduction control unit for special reproduction for controlling each of the units, and generating video information for fast-forward / fast-reverse reproduction according to an instruction from the video reproduction control unit for special reproduction. A video reproduction unit for trick play, a video restoration unit that restores the encoded image data from the reception unit, an interframe encoding unit that encodes the video information restored by the video restoration unit in an interframe mode, A special reproduction video generation control unit for controlling each of the units, and generating video information for fast-forward reproduction according to an instruction from the special reproduction video generation control unit.
Further, (5) the special reproduction video generation unit encodes the video restoration unit that restores the encoded image data from the reception unit and the video information restored by the video restoration unit by the still image coding method. And a special reproduction video generation control unit that controls each unit, and generates video information for fast forward / fast reverse reproduction according to an instruction from the special reproduction video generation control unit. It is characterized by.
【０００９】[0009]
【作用】前述のように構成された画像蓄積通信装置を用
いると、端末装置より受信した符号化画像データはその
まま第１の画像蓄積部に蓄積されると同時に、特殊再生
用の映像情報に変換されたデータが別に第２の画像蓄積
部に蓄積される。再生の際には、用途に応じて再生制御
部が、第１の画像蓄積部または第２の画像蓄積部から画
像データを呼び出すように再生選択スイッチを制御し、
通常再生と早送りや早戻し再生の切り替えを行う。特殊
再生用映像生成部では、受信部で受信した符号化画像デ
ータを逐次復元し、再度ＩＮＴＲＡ符号化やＩＮＴＥＲ
符号化や静止画像符号化を行って、早送り／早戻し再生
など特殊再生用の映像情報を作成する。この際、再符号
化するフレーム間隔を制御することで早送り／早戻し再
生時の再生速度が変化する。When the image storage / communication device configured as described above is used, the coded image data received from the terminal device is directly stored in the first image storage unit and at the same time converted into video information for special reproduction. The generated data is separately stored in the second image storage unit. At the time of reproduction, the reproduction control unit controls the reproduction selection switch so as to call the image data from the first image storage unit or the second image storage unit according to the purpose,
Switches between normal playback and fast forward / reverse playback. In the special reproduction video generation unit, the encoded image data received by the reception unit is sequentially restored, and INTRA encoding or INTER is performed again.
Encode video or still image to create video information for special playback such as fast forward / fast reverse playback. At this time, by controlling the frame interval to be re-encoded, the reproduction speed at the fast-forward / fast-reverse reproduction is changed.
【００１０】[0010]
【実施例】実施例について、図面を参照して以下に説明
する。図１は、本発明による画像蓄積通信装置の一実施
例を説明するための構成図で、図中、１は画像蓄積通信
装置、２は第１の画像蓄積部、３は第２の画像蓄積部、
４は特殊再生用映像生成部、５は再生制御部、６は再生
選択スイッチ、７は通信制御部、８は受信部、９は送信
部、１０は通信回線、１１-1〜１１-nは端末装置であ
る。Embodiments will be described below with reference to the drawings. FIG. 1 is a configuration diagram for explaining an embodiment of an image storage / communication device according to the present invention, in which 1 is an image storage / communication device, 2 is a first image storage unit, and 3 is a second image storage. Department,
4 is a special reproduction video generation unit, 5 is a reproduction control unit, 6 is a reproduction selection switch, 7 is a communication control unit, 8 is a reception unit, 9 is a transmission unit, 10 is a communication line, and 11-1 to 11-n are It is a terminal device.
【００１１】画像蓄積通信装置１は、受信部８及び送信
部９を介して通信回線１０と接続され、該通信回線１０
を介して複数の端末装置１１-1〜１１-nと画像データの
通信を行う。第１の画像蓄積部２は、蓄積用のメディア
を持ち、前記受信部８で受信した符号化画像データを通
信制御部７の指示により保存する。ここで保存されるデ
ータは図３に示すＩＮＴＥＲ符号化データ３１であり、
主にフレーム間の差分情報が符号化されているためデー
タ量は小さいが、早送りや早戻し再生には適さないデー
タである。The image storage communication device 1 is connected to a communication line 10 via a receiving section 8 and a transmitting section 9, and the communication line 10
Image data is communicated with a plurality of terminal devices 11-1 to 11-n via the. The first image storage unit 2 has a storage medium and stores the encoded image data received by the receiving unit 8 according to an instruction from the communication control unit 7. The data stored here is the INTER encoded data 31 shown in FIG.
The amount of data is small because the difference information between frames is mainly encoded, but the data is not suitable for fast-forward and fast-reverse reproduction.
【００１２】受信部８からの符号化画像データは特殊再
生用映像生成部４にも転送され、ここで特殊再生用映像
情報が作成され、第２の画像蓄積部３へ転送される。該
第２の画像蓄積部３は、第１の画像蓄積部２と同様に蓄
積用のメディアを持ち、前記特殊再生用映像生成部４で
生成された映像情報を通信制御部７の指示により保存す
る。The encoded image data from the receiving unit 8 is also transferred to the special reproduction video generation unit 4, where special reproduction video information is created and transferred to the second image storage unit 3. The second image storage unit 3 has a storage medium like the first image storage unit 2, and stores the video information generated by the special reproduction video generation unit 4 according to an instruction from the communication control unit 7. To do.
【００１３】第１の画像蓄積部２及び第２の画像蓄積部
３に保存された画像データは、再生制御部５により呼び
出される。通常再生の時は第１の画像蓄積部２より呼び
出され、特殊再生の時は第２の画像蓄積部３よりそれぞ
れ呼び出される。同時に再生制御部５は再生選択スイッ
チ６を制御し、送信部９へ転送するデータを切り替え
る。送信部９は、第１の画像蓄積部２または第２の画像
蓄積部３から転送された画像データを通信回線１０を介
して端末装置１１-1〜１１-nへ送信する。The image data stored in the first image storage unit 2 and the second image storage unit 3 is called by the reproduction control unit 5. It is called from the first image storage unit 2 during normal reproduction, and is called from the second image storage unit 3 during special reproduction. At the same time, the reproduction controller 5 controls the reproduction selection switch 6 to switch the data to be transferred to the transmitter 9. The transmission unit 9 transmits the image data transferred from the first image storage unit 2 or the second image storage unit 3 to the terminal devices 11-1 to 11-n via the communication line 10.
【００１４】図２は、図１における特殊再生用映像生成
部の構成図で、図中、２１は特殊再生用映像生成部、２
２は映像復元部、２３はＩＮＴＲＡ（フレーム内）符号
化部、２４は特殊再生用映像生成制御部である。映像復
元部２２は、前記受信部８で受信した符号化画像データ
を逐次復号化して動画像データを復元する。ＩＮＴＲＡ
符号化部２３は、前記映像復元部２２で復元された動画
像データをフレーム内符号化する。特殊再生用映像生成
制御部２４は、フレーム内符号化するフレームの選択
等、特殊再生用映像生成に関する制御を行う。ここで、
ＩＮＴＲＡ符号化部２３の代わりに静止画像符号化など
他の符号化手段をもつ符号化部を使用することで、様々
な符号化フォーマットに対応することが可能である。FIG. 2 is a block diagram of the special reproduction video generation unit in FIG. 1, in which 21 is a special reproduction video generation unit and 2
Reference numeral 2 is a video restoration unit, 23 is an INTRA (intra-frame) encoding unit, and 24 is a special reproduction video generation control unit. The video restoration unit 22 sequentially decodes the encoded image data received by the reception unit 8 to restore the moving image data. INTRA
The encoding unit 23 intra-frame encodes the moving image data restored by the video restoration unit 22. The special reproduction video generation control unit 24 performs control related to special reproduction video generation, such as selection of a frame to be intra-coded. here,
By using an encoding unit having another encoding means such as still image encoding instead of the INTRA encoding unit 23, various encoding formats can be supported.
【００１５】このような構成にすると、第２の画像蓄積
部３に蓄積される画像データは、図３に示すＩＮＴＲＡ
符号化データ３３のように、受信符号化画像データに対
してある間隔でフレームを間引いたものになる。フレー
ム間の差分情報が符号化されているＩＮＴＥＲ（フレー
ム間）符号化データ３１と比較すると、フレーム当たり
のデータ量はＩＮＴＲＡ符号化データ３３の方が大きく
なるが、フレーム単位でデータが独立しているため、ど
のような順番で呼び出して再生しても表示映像が乱れる
ことはない。このデータを蓄積順に呼び出して送信する
と早送り再生になり、逆方向に呼び出して送信すると早
戻し再生になる。With such a configuration, the image data stored in the second image storage unit 3 is the INTRA shown in FIG.
Like the encoded data 33, the received encoded image data is obtained by thinning out frames at certain intervals. Compared with the INTER (interframe) coded data 31 in which the difference information between frames is coded, the data amount per frame is larger in the INTRA coded data 33, but the data is independently frame by frame. Therefore, the displayed image will not be disturbed no matter what order is called and reproduced. Calling and transmitting this data in the order of accumulation results in fast forward playback, and calling and transmitting in the reverse direction results in fast reverse playback.
【００１６】前述したように、再生する先頭の画像デー
タはＩＮＴＲＡフレームであることが望ましいので、通
常再生の場合も再生開始のフレームのみは第２の画像蓄
積部より呼び出して再生し、２つめのフレームからは呼
び出し元を切り替えて第１の画像蓄積部からのデータを
再生する。As described above, since it is desirable that the first image data to be reproduced is an INTRA frame, even in the case of normal reproduction, only the reproduction start frame is called from the second image storage section and reproduced, and the second frame is reproduced. The calling source is switched from the frame to reproduce the data from the first image storage unit.
【００１７】なお、通常の再生しか行わないと分かって
いる場合、または早送り／早戻し再生を制限したい画像
データがある場合は、蓄積の際に、先頭フレームを除い
て復号化及びフレーム内符号化を行わず第２の画像蓄積
部に保存しないことで、蓄積メディアの浪費を防ぎメデ
ィアの容量を効率的に使用することができる。また、第
２の画像蓄積部３に保存される画像データは、フレーム
内符号化によって構成されているため、１フレームでデ
ータが完結しており、必要に応じてデータの編集、追
加、削除、入れ替え等が比較的容易にできる。If it is known that only normal reproduction is performed, or if there is image data for which fast-forward / fast-reverse reproduction is to be limited, decoding and intra-frame encoding except for the first frame are performed during storage. By not performing the above process and saving the image in the second image storage unit, it is possible to prevent the storage medium from being wasted and efficiently use the capacity of the medium. Further, since the image data stored in the second image storage unit 3 is configured by intra-frame coding, the data is completed in one frame, and data editing, addition, deletion, and It can be replaced relatively easily.
【００１８】図４は、特殊再生用映像生成部の他の実施
例を示す構成図で、図中、４１は特殊再生用映像生成
部、４２は映像復元部、４３はＩＮＴＥＲ（フレーム
間）符号化部、４４は特殊再生用映像生成制御部であ
る。映像復元部４２は、前記受信部８で受信した符号化
画像データを逐次復号化し動画像データを復元する。Ｉ
ＮＴＥＲ符号化部４３は、前記映像復元部４２で復元さ
れた動画像データをフレーム間符号化する。特殊再生用
映像生成制御部４４は、フレーム間符号化するフレーム
の選択等、特殊再生用映像生成に関する制御を行う。FIG. 4 is a block diagram showing another embodiment of the special reproduction video generation unit. In the figure, 41 is a special reproduction video generation unit, 42 is a video restoration unit, and 43 is an INTER (interframe) code. The conversion unit 44 is a special reproduction video generation control unit. The video restoration unit 42 sequentially decodes the encoded image data received by the reception unit 8 to restore the moving image data. I
The NTER encoding unit 43 performs inter-frame encoding of the moving image data restored by the video restoration unit 42. The special reproduction video generation control unit 44 performs control related to special reproduction video generation, such as selection of a frame to be inter-frame coded.
【００１９】このような構成にした場合、フレーム間符
号化するため特殊再生の用途としては早送り再生に限ら
れるが、生成される映像情報は受信した符号化画像デー
タのフレームを間引いたデータになるので、再生を行う
端末装置の動画像データの復号能力が低い場合でも、再
生が可能になる。また、前記実施例と比べると、フレー
ム間符号化するため蓄積データのフレーム当たりのサイ
ズがより小さくなり、蓄積メディアの資源を節約でき
る。In the case of such a configuration, the use of special reproduction is limited to fast-forward reproduction due to inter-frame encoding, but the generated video information is data obtained by thinning out the frames of the received encoded image data. Therefore, even when the decoding capability of the moving image data of the terminal device that performs the reproduction is low, the reproduction can be performed. Further, as compared with the above-mentioned embodiment, since the inter-frame coding is performed, the size of the accumulated data per frame becomes smaller, and the resources of the accumulating medium can be saved.
【００２０】図５は、特殊再生用映像生成部の更に他の
実施例を示す構成図で、図中、５１は特殊再生用映像生
成部、５２は映像復元部、５３は静止画符号化部、５４
は特殊再生用映像生成制御部である。映像復元部５２
は、前記受信部８で受信した符号化画像データを逐次復
号化して動画像データを復元する。静止画符号化部５３
は、前記映像復元部５２で復元された動画像データをフ
レーム単位で静止画符号化する。特殊再生用映像生成制
御部５４は、静止画符号化するフレームの選択等、特殊
再生用映像生成に関する制御を行う。FIG. 5 is a block diagram showing still another embodiment of the special reproduction video generation section. In the figure, 51 is a special reproduction video generation section, 52 is a video restoration section, and 53 is a still picture coding section. , 54
Is a special reproduction video generation control unit. Video restoration unit 52
The video data is restored by sequentially decoding the coded image data received by the receiving unit 8. Still picture coding unit 53
Encodes the moving image data restored by the image restoration unit 52 in frame units. The special reproduction video generation control unit 54 performs control relating to special reproduction video generation, such as selection of a frame for still image coding.
【００２１】静止画符号化のアルゴリズムとしては、一
般的なものとして、例えばＩＴＵ−Ｔ勧告Ｔ.８１など
がある。このような構成にすると、ＩＮＴＥＲ／ＩＮＴ
ＲＡ符号化に比べて１フレームあたりのデータ量は大き
くなるが、動画像データの復号機能を持たない端末装置
や、画像蓄積通信装置に直接接続した画像表示装置等で
も、簡易的な動画像データの再生が可能になる。フレー
ム間の相関はないため、順方向／逆方向それぞれの再生
が可能である。このように、静止画像符号化などの符号
化手段をもつ符号化部を使用することで、前述したＩＮ
ＴＲＡ符号化部やＩＮＴＥＲ符号化部を使用する場合を
含めて様々な符号化フォーマットに対応することが可能
である。As a still image coding algorithm, for example, there is ITU-T recommendation T.81 as a general one. With this configuration, INTER / INT
Although the amount of data per frame is larger than that of RA encoding, simple moving image data can be used even in a terminal device that does not have a moving image data decoding function or an image display device directly connected to an image storage communication device. Can be played back. Since there is no correlation between frames, it is possible to reproduce in the forward and backward directions. In this way, by using the encoding unit having encoding means such as still image encoding, the above-mentioned IN
It is possible to support various coding formats including the case where the TRA coding unit and the INTER coding unit are used.
【００２２】このように、本発明の画像蓄積通信装置
は、早送り／早戻し再生など特殊再生専用のデータを保
存する第２の画像蓄積部を備え、受信した符号化画像デ
ータをそのまま第１の画像蓄積部に保存すると同時に、
受信した符号化画像データを特殊再生用映像生成部にて
早送り／早戻し再生など特殊再生用の映像情報に変換し
てから第２の画像蓄積部に保存する手段を備えるもので
ある。As described above, the image storage communication apparatus of the present invention is provided with the second image storage section for storing the data dedicated to the special reproduction such as the fast forward / fast reverse reproduction, and the received encoded image data is directly stored in the first image storage section. At the same time to save in the image storage unit
There is provided means for converting the received encoded image data into video information for special reproduction such as fast-forward / fast-reverse reproduction by the special reproduction video generation unit and then storing the converted image information in the second image storage unit.
【００２３】また、第１の画像蓄積部からのデータ呼び
出し、第２の画像蓄積部からのデータ呼び出しを制御す
る再生制御部と再生選択スイッチを備えている。さら
に、前記特殊再生用映像生成部は、映像復元部と、ＩＮ
ＴＲＡ符号化部やＩＮＴＥＲ符号化部と、特殊再生用映
像生成制御部とを備えている。さらに、前記特殊再生用
映像生成部は、映像復元部と、ＩＮＴＲＡ符号化部やＩ
ＮＴＥＲ符号化部や静止画符号化部と、特殊再生用映像
生成部とを備えている。Further, a reproduction control section and a reproduction selection switch for controlling data calling from the first image storage section and data calling from the second image storage section are provided. Further, the special reproduction video generation unit includes an image restoration unit and an IN
It includes a TRA encoder, an INTER encoder, and a special reproduction video generation controller. Further, the special reproduction video generation unit includes a video restoration unit, an INTRA encoding unit, and an ITRA encoding unit.
An NTER encoding unit, a still image encoding unit, and a special reproduction video generation unit are provided.
【００２４】[0024]
【発明の効果】以上の説明から明らかなように、本発明
によると、以下のような効果がある。 （１）請求項１に対応する効果：画像蓄積通信装置に、
特殊再生用の映像を作成する特殊再生用映像部と、生成
された特殊再生用の映像情報を保存する第２の画像蓄積
部とを備えることにより、通常再生用の画像データと別
に早送り／早戻し等の特殊再生用の画像データを生成
し、保存及び管理することができる。また、通常再生用
画像データの保存と特殊再生用画像データの保存は独立
に動作するので、機能の追加や変更が比較的自由にでき
る。 （２）請求項２に対応する効果：再生制御部が２つの画
像蓄積部からの画像データの呼び出しを切り替えること
で容易に通常再生と特殊再生の切り替えを行うことがで
き、再生時の制御が簡便になる。 （３）請求項３に対応する効果：特殊再生用映像生成部
で、復元された動画像データをフレーム内符号化して映
像情報を作成することによって、端末装置側に特別な機
能を必要とせずに任意のフレームから早送り／早戻し再
生を行うことができる。また、早送り／早戻しの速度
は、特殊再生用映像生成部でフレーム内符号化するフレ
ーム間隔を制御することで変化させることができる。さ
らに、映像情報はフレーム単位で独立しているため、デ
ータの編集、追加、削除、入れ替えなどが比較的容易で
ある。 （４）請求項４に対応する効果：特殊再生用映像生成部
で、復元された動画像データをフレーム間符号化して映
像情報を作成することによって、動画像データの復号能
力が低い端末装置であっても早送り再生を行うことがで
きる。 （５）請求項５に対応する効果：特殊再生用映像生成部
で、復元された動画像データをフレーム単位で静止画像
として符号化して映像情報を作成することによって、Ｉ
ＮＴＲＡ符号化を用いるよりも符号化効率が向上でき、
より少ない符号量で、より高品質な映像を蓄積すること
ができる。また、Ｈ.２６１等動画像データの復号能力
を持たない端末装置を用いた場合でも、動画像の順方向
／逆方向の再生を簡易的に行うことができる。As is apparent from the above description, the present invention has the following effects. (1) Effect corresponding to claim 1: In the image storage communication device,
By providing a special playback video section for creating a special playback video and a second image storage section for storing the generated special playback video information, fast-forward / fast-forward in addition to the normal playback image data. Image data for special reproduction such as returning can be generated, stored, and managed. Further, since the saving of the image data for normal reproduction and the saving of the image data for special reproduction operate independently, it is possible to add or change the function relatively freely. (2) Effect corresponding to claim 2: The reproduction control unit can easily switch between normal reproduction and special reproduction by switching the calling of the image data from the two image storage units. It becomes easy. (3) Effect corresponding to claim 3: The special reproduction video generation unit does not need a special function on the terminal device side by intra-frame encoding the restored moving image data to create video information. It is possible to perform fast forward / fast reverse playback from any frame. Further, the fast-forward / fast-reverse speed can be changed by controlling the frame interval for intra-frame encoding in the special reproduction video generation unit. Furthermore, since the video information is independent on a frame-by-frame basis, it is relatively easy to edit, add, delete, or replace the data. (4) Effect corresponding to claim 4: In the terminal device having a low decoding capability of moving image data, the special reproduction image generation unit encodes the restored moving image data by inter-frame coding to create image information. Even if there is, fast-forward playback can be performed. (5) Effect corresponding to claim 5: In the special reproduction video generation unit, the restored moving image data is encoded as a still image in frame units to create video information.
Coding efficiency can be improved as compared with the use of NTRA coding,
It is possible to store higher quality video with a smaller code amount. Further, even when a terminal device that does not have the ability to decode moving image data such as H.261 is used, it is possible to easily perform forward / backward reproduction of a moving image.
【図１】本発明による画像蓄積通信装置の一実施例を説
明するための構成図である。FIG. 1 is a configuration diagram for explaining an embodiment of an image storage communication device according to the present invention.
【図２】図１における特殊再生用映像生成部の構成図で
ある。FIG. 2 is a configuration diagram of a special reproduction video generation unit in FIG.
【図３】本発明における受信データと蓄積データの関連
を示す説明図である。FIG. 3 is an explanatory diagram showing a relationship between received data and accumulated data according to the present invention.
【図４】本発明における特殊再生用映像生成部の他の実
施例を示す構成図である。FIG. 4 is a configuration diagram showing another embodiment of the trick play video generation unit according to the present invention.
【図５】本発明における特殊再生用映像生成部の更に他
の実施例を示す構成図である。FIG. 5 is a configuration diagram showing still another embodiment of the trick-play video generation unit according to the present invention.
【図６】従来の画像蓄積通信装置の構成図である。FIG. 6 is a configuration diagram of a conventional image storage communication device.
１…画像蓄積通信装置、２…第１の画像蓄積部、３…第
２の画像蓄積部、４…特殊再生用映像生成部、５…再生
制御部、６…再生選択スイッチ、７…通信制御部、８…
受信部、９…送信部、１０…通信回線、１１-1〜１１-n
…端末装置、２１，４１，５１…特殊再生用映像生成
部、２２，４２，５２…映像復元部、２３…ＩＮＴＲＡ
（フレーム内）符号化部、２４，４４，５４…特殊再生
用映像生成制御部、４３…ＩＮＴＥＲ符号化部、５３…
静止画符号化部。DESCRIPTION OF SYMBOLS 1 ... Image storage communication device, 2 ... 1st image storage part, 3 ... 2nd image storage part, 4 ... Special reproduction image production part, 5 ... Reproduction control part, 6 ... Reproduction selection switch, 7 ... Communication control Department, 8 ...
Receiver, 9 ... Transmitter, 10 ... Communication line, 11-1 to 11-n
... Terminal device 21, 41, 51 ... Special reproduction video generation unit, 22, 42, 52 ... Video restoration unit, 23 ... INTRA
(Intra-frame) coding unit, 24, 44, 54 ... Special reproduction video generation control unit, 43 ... INTER coding unit, 53 ...
Still image coding unit.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０４Ｎ 7/137 Ｚ (72)発明者 仲林 次郎 大阪府大阪市阿倍野区長池町22番22号 シ ャープ株式会社内 (72)発明者 岩野 恒明 大阪府大阪市阿倍野区長池町22番22号 シ ャープ株式会社内 (72)発明者 中野 博隆 東京都千代田区内幸町１丁目１番６号 日 本電信電話株式会社内 (72)発明者 中村 修 東京都千代田区内幸町１丁目１番６号 日 本電信電話株式会社内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl.6 Identification code Internal reference number FI Technical indication H04N 7/137 Z (72) Inventor Jiro Nakabayashi 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Osaka Prefecture Co., Ltd. (72) Inventor Tsuneaki Iwano 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (72) Inventor Hirotaka Nakano 1-1-6 Uchisai-cho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Osamu Nakamura 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation
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| JPH0846902Atrue JPH0846902A (en) | 1996-02-16 |
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