JPH07154792A - Picture transmission equipment - Google Patents

Picture transmission equipment

Info

Publication number
JPH07154792A
JPH07154792A JP25454394A JP25454394A JPH07154792A JP H07154792 A JPH07154792 A JP H07154792A JP 25454394 A JP25454394 A JP 25454394A JP 25454394 A JP25454394 A JP 25454394A JP H07154792 A JPH07154792 A JP H07154792A
Authority
JP
Japan
Prior art keywords
image
signal
picture
converter
still
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
JP25454394A
Other languages
Japanese (ja)
Other versions
JP2788714B2 (en
Inventor
Yuji Oguchi
裕次 大口
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.)
Toko Inc
Original Assignee
Toko Inc
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 Toko Inc filed Critical Toko Inc
Priority to JP25454394A priority Critical patent/JP2788714B2/en
Publication of JPH07154792A publication Critical patent/JPH07154792A/en
Application granted granted Critical
Publication of JP2788714B2 publication Critical patent/JP2788714B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

PURPOSE:To easily constitute the picture transmission equipment which uses 3 video encoder and a video decoder for moving picture transmission to transmit a still picture and receives a vivid still picture at any time in the intervals of moving picture transmission in response to the request from the receiver side. CONSTITUTION:The picture transmission equipment having a low transmission rate is provided with a moving picture conversion part 3, which converts an inputted picture signal to a reduced moving picture, and a still picture conversion part 4 which divides a one-frame portion of the inputted picture signal into plural picture signals 9A, 9B, 9C, and 9D having the same size as the reduced moving picture. The picture signal outputted from an AD converter 1 is selectively inputted to the moving picture conversion part 3 or the still picture conversion part 4 by the switching signal from a receiver, and outputs of the moving picture conversion part 3 and the still picture conversion part 4 are applied to a common video encoding part 5.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、画像遠隔監視装置やテ
レビ電話等に用いられる画像伝送装置に関するものであ
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image transmission device used for an image remote monitoring device, a videophone and the like.

【0002】[0002]

【従来の技術】動画像は静止画像に比べて圧縮効率がよ
く、低伝送レートで送ることができる利点がある。この
ような動画像伝送装置としては、CCITT(国際電信
電話諮問委員会)のH.261規格のものが一般に使用
されている。一方、静止画像の伝送装置としては、JP
EG規格またはこれに準ずる画像圧縮、伸長技術によっ
て伝送効率を向上させたものがある。
2. Description of the Related Art A moving image has a compression efficiency higher than that of a still image and has an advantage that it can be sent at a low transmission rate. An example of such a moving image transmission device is H.264 of CCITT (International Telegraph and Telephone Consultative Committee). The 261 standard is generally used. On the other hand, as a still image transmission device, JP
Some have improved transmission efficiency by image compression and decompression technologies conforming to the EG standard or similar.

【0003】[0003]

【発明が解決しようとする課題】低伝送レートで送られ
てくる動画像は、リアルタイムで自然な動きの動画像を
得られる反面、画質が粗くなる欠点がある。このような
動画像で遠隔地の監視を行う場合を例にとると、たとえ
ば何か異変がおきて画面に注目しても、映像が不鮮明で
細かい部分まで判別できず詳しい情報が得られない問題
があった。静止画伝送の場合は、動画像よりもよい画質
が得られるが、圧縮効率が悪く伝送に時間がかかるた
め、動きが不連続で見にくくなるうえ、重要なシーンを
見逃すおそれがあった。
A moving image sent at a low transmission rate can obtain a moving image with natural movement in real time, but has a drawback that the image quality becomes coarse. Taking the case of monitoring a remote place with such a moving image, for example, even if something strange happens and the user focuses on the screen, the image is unclear and it is not possible to determine the detailed parts and detailed information cannot be obtained. was there. In the case of still image transmission, better image quality than moving images can be obtained, but since compression efficiency is poor and transmission takes time, discontinuity of movement makes it difficult to see, and there is a risk of missing important scenes.

【0004】[0004]

【発明の目的】本発明は、通常は低伝送レートの動画像
伝送装置として動作する画像伝送装置において、動画像
伝送の合間に必要に応じて、より鮮明な静止画像を伝送
することができる画像伝送装置を提供することを目的と
する。
SUMMARY OF THE INVENTION An object of the present invention is to provide an image transmitting apparatus which normally operates as a moving image transmitting apparatus having a low transmission rate, in which a clearer still image can be transmitted as needed between moving image transmissions. An object is to provide a transmission device.

【0005】[0005]

【課題を解決するための手段】本発明の画像伝送装置
は、アナログの映像入力信号をデジタルの画像信号に変
換するAD変換器と、AD変換器から出力された画像信
号を縮小動画像に変換する動画像変換部と、この縮小動
画像をハイブリッド符号化方式により圧縮符号化する映
像符号化器とを有し、映像符号化器でコーディングされ
た映像信号を伝送路に送りだす送信機と、伝送路を介し
てこの映像信号を受信する受信機とを具えた画像伝送装
置において、受信機からの信号によって動作する切換手
段をAD変換器と動画像変換部との間に設け、切換手段
と映像符号化器の間に静止画像変換部を挿入し、AD変
換器から出力される画像信号を、切換手段によって動画
像変換部または静止画像変換部のいずれか一方に選択的
に入力可能にするとともに、切換手段を静止画像変換部
側に切り換えたとき、静止画像変換部において1フレー
ムの画像信号が前記縮小動画像と同じサイズの複数個の
画像信号に分割されて、映像符号化器に順次加えられる
ようにした構成を特徴とする。
An image transmission apparatus of the present invention is an AD converter for converting an analog video input signal into a digital image signal, and an image signal output from the AD converter into a reduced moving image. And a video encoder for compressing and coding the reduced video by a hybrid coding method, and a transmitter for sending out a video signal coded by the video encoder to a transmission path, and a transmission In an image transmission apparatus including a receiver for receiving this video signal via a channel, a switching means that operates according to a signal from the receiver is provided between the AD converter and the moving picture converting section, and the switching means and the video are provided. If a still image converter is inserted between the encoders and the image signal output from the AD converter can be selectively input to either the moving image converter or the still image converter by the switching means. By the way, when the switching means is switched to the side of the still image converter, the image signal of one frame is divided into a plurality of image signals of the same size as the reduced moving image in the still image converter, and the still image converter outputs to the video encoder. It is characterized by a configuration that can be added sequentially.

【0006】[0006]

【実施例】図1は本発明の画像伝送装置における送信機
側の概略の構成例を示すブロック図、図2は画像の変換
状態の説明図である。図1において、1はビデオカメラ
等から供給されるアナログの映像入力信号をデジタルの
画像信号に変換するAD変換器である。AD変換器1か
ら出力される画像信号は、符号化のための前処理を行う
動画像変換部3または静止画像変換部4のいずれか一方
に、スイッチ2で切替えられて入力される。動画像変換
部3においては、図2に示すように、垂直及び水平方向
の画素数が483本×720画素である1フレームの原
画像7を、縦、横とも半分の240本×352画素に縮
小した縮小動画像8に変換し、次段の映像符号化器5に
供給する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing a schematic configuration example of a transmitter side in an image transmission apparatus of the present invention, and FIG. 2 is an explanatory diagram of an image conversion state. In FIG. 1, reference numeral 1 is an AD converter for converting an analog video input signal supplied from a video camera or the like into a digital image signal. The image signal output from the AD converter 1 is switched by the switch 2 and input to either the moving image conversion unit 3 or the still image conversion unit 4 which performs preprocessing for encoding. In the moving image conversion unit 3, as shown in FIG. 2, the original image 7 of one frame having the number of pixels in the vertical and horizontal directions of 483 pixels × 720 pixels is converted into half 240 pixels × 352 pixels in both vertical and horizontal directions. It is converted into a reduced reduced moving image 8 and supplied to the video encoder 5 in the next stage.

【0007】一方、静止画像変換部4では、1フレーム
の原画像7を縮小せずに、縮小動画像8と同じサイズ、
すなわち1フレームの1/4ずつの四つの画像信号(2
40本×352画素)に分割する。そして、これらの四
つの画像9A、9B、9C、9Dの信号をH.261規
格に適合した映像符号化器5に順次出力する。動画像変
換部3から映像符号化器5に加えられた縮小動画像8、
または静止画像変換部4から映像符号化器5に加えられ
た分割画像9A、9B、9C、9Dの画像信号は、IN
TRAモード(フレーム内相関モード)で圧縮符号化さ
れ、さらに伝送路で発生する誤りを訂正するための符号
化を伝送符号化器6で施されて伝送路に送り出される。
なお、映像符号化器5はDCT(ディスクリートコサイ
ン変換)や動き補償予測符号化、フレーム間予測符号化
等を組合せたハイブリッド符号化方式で圧縮符号化する
ものであればよく、必ずしもH.261規格に適合しな
くてもよい。
On the other hand, in the still image conversion unit 4, the original image 7 of one frame is not reduced, and the same size as the reduced moving image 8
That is, four image signals (2
(40 lines × 352 pixels). Then, the signals of these four images 9A, 9B, 9C, and 9D are H.264. It is sequentially output to the video encoder 5 conforming to the H.261 standard. The reduced moving image 8 added from the moving image converting unit 3 to the video encoder 5,
Alternatively, the image signals of the divided images 9A, 9B, 9C and 9D added from the still image conversion unit 4 to the video encoder 5 are IN
The data is compression-encoded in the TRA mode (intra-frame correlation mode), further encoded by the transmission encoder 6 to correct an error occurring in the transmission line, and sent out to the transmission line.
It should be noted that the video encoder 5 may be any one that performs compression encoding by a hybrid encoding method that combines DCT (discrete cosine transform), motion compensation predictive encoding, interframe predictive encoding, and the like, and is not necessarily H.264. It does not have to comply with the H.261 standard.

【0008】図3は、送信機側のより具体的な構成の一
実施例を示すブロック図である。図3において、1はA
D変換器、3は動画像変換部、4は静止画像変換部であ
る。41は動画像用のバッファメモリ、60はプリフィル
タ、42は静止画用のバッファメモリ、43は走査変換する
ためのバッファメモリ、70はバッファメモリ43における
走査変換動作を制御する走査変換制御器、5はH.26
1規格に適合した映像符号化器、6は伝送符号化器であ
る。バッファメモリ43と映像符号化器5は、動画像変換
部3及び静止画像変換部4の両方に用いられる。
FIG. 3 is a block diagram showing an example of a more specific configuration on the transmitter side. In FIG. 3, 1 is A
D converter, 3 is a moving image converter, and 4 is a still image converter. 41 is a buffer memory for moving images, 60 is a pre-filter, 42 is a buffer memory for still images, 43 is a buffer memory for scan conversion, 70 is a scan conversion controller for controlling the scan conversion operation in the buffer memory 43, 5 is H. 26
A video encoder conforming to the 1 standard, 6 is a transmission encoder. The buffer memory 43 and the video encoder 5 are used for both the moving image conversion unit 3 and the still image conversion unit 4.

【0009】また、31はバッファメモリ41の画像書き込
み及び画像読み出し制御を行うメモリ制御器、32はバッ
ファメモリ42の画像書き込み及び画像読み出し制御を行
うメモリ制御器であり、メモリ制御器31、32は共にCP
Uによってその動作が制御される。メモリ制御器32とバ
ッファメモリ42との間の画像書き込み側の電線路には、
画像信号のフレーム信号に同期してオン、オフするスイ
ッチ35が設けてある。21 、22は連動して動作するスイ
ッチであり、これら一組のスイッチが図1のスイッチ2
に相当する。図3には、バッファメモリ41とバッファメ
モリ42を便宜上分けて図示したが、静止画用のバッファ
メモリ42の一部を動画像の場合にも使用することによ
り、同じバッファメモリを共用することができる。
Further, 31 is a memory controller for controlling image writing and image reading of the buffer memory 41, 32 is a memory controller for controlling image writing and image reading of the buffer memory 42, and the memory controllers 31, 32 are CP together
Its operation is controlled by U. In the electric line on the image writing side between the memory controller 32 and the buffer memory 42,
A switch 35 that turns on and off in synchronization with the frame signal of the image signal is provided. 21 and 22 are switches that operate in conjunction with each other, and one set of these switches is the switch 2 in FIG.
Equivalent to. Although the buffer memory 41 and the buffer memory 42 are shown separately in FIG. 3 for convenience, the same buffer memory can be shared by using a part of the buffer memory 42 for a still image also in the case of a moving image. it can.

【0010】スイッチ21、22が図3のように動画像伝送
側に切り換わっている状態においては、AD変換器1か
ら出力される画像信号は、輝度信号Y、色差信号CB
Rごとにバッファメモリ41で縮小保持され、プリフィ
ルタ60で順次フィルタリング処理されてから、バッファ
メモリ43に供給される。一方、スイッチ21、22が図3と
逆の静止画像伝送側に切り換わった場合は、スイッチ35
が閉じて1フレーム分の画像書き込み命令がメモリ制御
器32から出され、AD変換器1からの画像信号は、その
ままの輝度信号Y、色差信号CB 、CR がバッファメモ
リ42で保持されてバッファメモリ43に供給される。スイ
ッチ35は、画像信号の1フレーム期間だけオンした後、
すぐオフになり、後述する静止画更新の要求が受信機側
から出されるまでオフ状態を継続する。
In the state where the switches 21 and 22 are switched to the moving image transmitting side as shown in FIG. 3, the image signal output from the AD converter 1 is the luminance signal Y, the color difference signal C B ,
It is reduced held in the buffer memory 41 for each C R, since the sequential filtering process by the pre-filter 60, is supplied to the buffer memory 43. On the other hand, when the switches 21 and 22 are switched to the still image transmission side, which is the opposite of that in FIG. 3, the switch 35
Is closed and an image writing command for one frame is issued from the memory controller 32. As for the image signal from the AD converter 1, the luminance signal Y and the color difference signals C B and C R as they are are held in the buffer memory 42. It is supplied to the buffer memory 43. After the switch 35 is turned on for one frame period of the image signal,
It turns off immediately and remains in the off state until a request for updating a still image to be described later is issued from the receiver side.

【0011】バッファメモリ43に加えられた画像信号
は、基本ブロックごとに画像データが並び換えられて映
像符号化器5に送られ、画像圧縮符号化された後、伝送
符号化器6で伝送路に適合する信号に符号化されて伝送
路から送出される。なお、画像信号は、バッファメモリ
41、42に入力するまでは輝度信号Y及び色差信号CB
R が並列処理され、バッファメモリ41、42から出力さ
れてからは直列に並べ換えて送られる。伝送路を介して
送信機からの画像信号を受け取った受信機側では、H.
261規格に適合した映像復号化器やバッファメモリに
よって映像を復元し、受像機に供給する。このときの映
像は、動画像では圧縮変換された分だけ画質が劣化して
いるが、静止画像の場合は1フレームの画像を縮小しな
いで四つの画像に分けて送られてくるので、原画像に近
い高い解像度のものが得られる。
The image signal added to the buffer memory 43 is sent to the video encoder 5 after the image data is rearranged for each basic block, and is subjected to image compression encoding. Is encoded into a signal conforming to the above and is transmitted from the transmission line. The image signal is stored in the buffer memory.
Until input to 41 and 42, the luminance signal Y and the color difference signal C B ,
After CR is processed in parallel and output from the buffer memories 41 and 42, it is rearranged in series and sent. On the receiver side that receives the image signal from the transmitter via the transmission path, the H.264 signal is transmitted.
The video is restored by the video decoder and buffer memory conforming to the H.261 standard and supplied to the receiver. The image quality of the video at this time is degraded by the amount of compression conversion in the moving image, but in the case of a still image, one frame of the image is sent without dividing it into four images. A high resolution image close to is obtained.

【0012】図4は本発明の画像伝送装置の一実施例に
おける制御系の動作の流れを示すフローチャートであ
る。最初のステップP1で静止画の割り込み要求がなけ
れば、ステップP2で動画像を伝送するルーチンを処理
してステップP1に戻る動作が繰り返され、動画像を連
続して伝送し続ける。今、受信機側のキーボードのキー
が押されることによって静止画の要求が出されると、ス
テップP3から始まる静止画伝送のルーチンに移る。ま
ず、ステップP3ではフレームパルスに同期して静止画
モードに切替え、図3のスイッチ35が閉じることにより
ステップP4で1フレーム分の新たな映像を記憶する。
ステップP5では、この1フレームの画像を例えばIN
TRAモードで、図2のように9A、9B、9C、9D
の四つの画面に分割し、これらの四つの画像信号を一画
面分ずつ順次送り出す。これらの四分割された画面は、
受信側において1フレームの静止画像に復元される。そ
して、ステップP6で静止画更新の要求がなく、また、
ステップP7でも静止画解除の要求がなければ、ステッ
プP5に戻って同一映像の静止画を送り続けることにな
る。
FIG. 4 is a flow chart showing the operation flow of the control system in the embodiment of the image transmission apparatus of the present invention. If there is no still image interrupt request in the first step P1, the operation of processing the routine for transmitting the moving image and returning to step P1 is repeated in step P2, and the moving image is continuously transmitted. Now, when a request for a still image is issued by pressing a key on the keyboard on the receiver side, the routine proceeds to a still image transmission routine starting from step P3. First, in step P3, the still image mode is switched in synchronization with the frame pulse, and the switch 35 shown in FIG. 3 is closed to store a new image for one frame in step P4.
In step P5, this 1-frame image is, for example, IN
In TRA mode, 9A, 9B, 9C, 9D as shown in FIG.
Are divided into four screens, and these four image signals are sequentially sent out one screen at a time. These quadrant screens are
At the receiving side, it is restored to a still image of one frame. Then, in step P6, there is no request to update the still image, and
If there is no request to cancel the still image in step P7, the process returns to step P5 and the still image of the same video is continuously sent.

【0013】もし、ステップP6で受信機側のキーが押
されて新たな静止画の要求が出されると、ステップP3
に戻って前記と同様な処理を行い、その時点の新しい静
止画像を送りだす。一方、ステップP7で静止画伝送を
解除する要求が出された場合は、ステップP2に戻って
通常の動画像伝送状態となる。なお、ステップP5にお
ける静止画伝送の制御には、画像信号の中に取り込まれ
ているスペアビットS0 、S1 を利用するとよい。例え
ば、図2の9A画面のビットをS0 =1、S1 =0に設
定し、残りの9B、9C、9Dの三つの画面のビットS
0 、S1 をいずれもS0 =0、S1 =0に設定しておけ
ば、受信機ではS0 =1を検出したときに動画像受信状
態への切り換えを行うことができる。なお、実施例では
1フレームの画像を4分割するようにしたが、4分割に
限らず、例えば16分割する構成とすることもできる。
If a key on the receiver side is pressed to issue a new still image request in step P6, step P3
Then, the process similar to the above is carried out, and a new still image at that time is sent out. On the other hand, when a request to cancel the still image transmission is issued in step P7, the process returns to step P2 and the normal moving image transmission state is set. Note that the spare bits S 0 and S 1 incorporated in the image signal may be used for controlling the still image transmission in step P5. For example, the bits of the 9A screen of FIG. 2 are set to S 0 = 1 and S 1 = 0, and the remaining bits S of the 3B screens 9B, 9C and 9D are set.
0, if both the S 1 by setting the S 0 = 0, S 1 = 0, can be switched to the moving picture reception state when detecting the S 0 = 1 in the receiver. In the embodiment, the image of one frame is divided into four, but the number of divisions is not limited to four, and may be divided into 16 for example.

【0014】[0014]

【発明の効果】本発明によれば、通常は低伝送レートで
動作する動画像伝送装置でありながら、動画像伝送の合
間に受信機側からの要求に応じて、鮮明な静止画像を随
時伝送できる画像伝送装置を得られる。また、静止画像
伝送時には原画像を縮小しないで符号化するため、原画
像に近い高精細画質の静止画像を得ることができる。さ
らに、動画像伝送用の国際規格である映像符号化器及び
映像復号化器を、そのまま静止画像伝送用にも兼用でき
るので僅かな回路装置の変更で済むうえ、動画像伝送状
態に戻ることなく、静止画像を次々と更新しながら連続
的に伝送できる特長もある。
According to the present invention, although it is a moving image transmission apparatus which normally operates at a low transmission rate, a clear still image is transmitted at any time in response to a request from the receiver side between moving image transmissions. An image transmission device capable of being obtained can be obtained. Further, since the original image is encoded without being reduced during transmission of the still image, it is possible to obtain a high-definition still image close to the original image. Furthermore, since the video encoder and video decoder, which are international standards for moving image transmission, can also be used as they are for still image transmission, it is possible to change the circuit device slightly and to avoid the return to the moving image transmission state. Another feature is that it can continuously transmit still images while updating them one after another.

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

【図1】 本発明に係る送信機側の概略の構成例を示す
ブロック図
FIG. 1 is a block diagram showing a schematic configuration example of a transmitter side according to the present invention.

【図2】 画像の変換状態の説明図FIG. 2 is an explanatory diagram of an image conversion state.

【図3】 本発明に係る送信機の構成の一実施例を示す
ブロック図
FIG. 3 is a block diagram showing an embodiment of a configuration of a transmitter according to the present invention.

【図4】 本発明における制御系の動作の流れを示すフ
ローチャート
FIG. 4 is a flowchart showing a flow of operation of a control system in the present invention.

【符号の説明】[Explanation of symbols]

1 AD変換器 3 動画像変換部 4 静止画像変換部 5 映像符号化器 1 AD converter 3 Moving image converter 4 Still image converter 5 Video encoder

───────────────────────────────────────────────────── 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 7734−5C H04N 5/92 H ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location 7734-5C H04N 5/92 H

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 アナログの映像入力信号をデジタルの画
像信号に変換するAD変換器と、該画像信号を縮小動画
像に変換する動画像変換部と、該縮小動画像をハイブリ
ッド符号化方式により圧縮符号化する映像符号化器とを
有し、映像符号化器でコーディングされた映像信号を伝
送路に送りだす送信機と、伝送路を介して該映像信号を
受信する受信機とを具えた画像伝送装置において、 受信機からの信号によって動作する切換手段をAD変換
器と動画像変換部との間に設け、該切換手段と映像符号
化器の間に静止画像変換部を挿入し、AD変換器から出
力される画像信号を、該切換手段によって動画像変換部
または静止画像変換部のいずれか一方に選択的に入力可
能にするとともに、切換手段を静止画像変換部側に切り
換えたとき、静止画像変換部において1フレームの画像
信号が前記縮小動画像と同じサイズの複数個の画像信号
に分割されて、映像符号化器に順次加えられるようにし
たことを特徴とする画像伝送装置。
1. An AD converter for converting an analog video input signal into a digital image signal, a moving image converter for converting the image signal into a reduced moving image, and the reduced moving image compressed by a hybrid encoding method. Image transmission including a video encoder for encoding, a transmitter for sending out a video signal coded by the video encoder to a transmission line, and a receiver for receiving the video signal via the transmission line In the apparatus, a switching unit that operates according to a signal from a receiver is provided between the AD converter and the moving image conversion unit, and a still image conversion unit is inserted between the switching unit and the video encoder, and the AD converter. The image signal output from the switching means can be selectively input to either the moving image conversion portion or the still image conversion portion by the switching means, and when the switching means is switched to the still image conversion portion side, the still image 1 frame image signal is divided into a plurality of image signals of the same size as the reduced moving picture in the section, the image transmission apparatus being characterized in that as is sequentially added to the video encoder.
【請求項2】 映像符号化部としてH.261規格に適
合したものを用い、静止画像変換部における1フレーム
の画像信号の分割数を4個とした請求項1の画像伝送装
置。
2. An H.264 as a video encoding unit. 2. The image transmission device according to claim 1, wherein the image transmission device according to the H.261 standard is used and the number of divisions of the image signal of one frame in the still image conversion unit is four.
【請求項3】 受信機からの信号によって動作する第二
の切換手段を静止画像変換部内に設け、第二の切換手段
を切り換えたとき、AD変換器から入力された新たな画
像信号を基にして、静止画像変換部で再び1フレームの
分割処理が繰り返されるようにした請求項1の画像伝送
装置。
3. A second switching means, which operates according to a signal from the receiver, is provided in the still image conversion section, and when the second switching means is switched, based on a new image signal input from the AD converter. The image transmission apparatus according to claim 1, wherein the still image conversion unit repeats the division processing of one frame again.
JP25454394A 1993-10-01 1994-09-22 Image transmission device Expired - Lifetime JP2788714B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25454394A JP2788714B2 (en) 1993-10-01 1994-09-22 Image transmission device

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP26952493 1993-10-01
JP5-269524 1993-10-01
JP25454394A JP2788714B2 (en) 1993-10-01 1994-09-22 Image transmission device

Publications (2)

Publication Number Publication Date
JPH07154792A true JPH07154792A (en) 1995-06-16
JP2788714B2 JP2788714B2 (en) 1998-08-20

Family

ID=26541727

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25454394A Expired - Lifetime JP2788714B2 (en) 1993-10-01 1994-09-22 Image transmission device

Country Status (1)

Country Link
JP (1) JP2788714B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009033423A (en) * 2007-07-26 2009-02-12 Hitachi Ltd Image compression method and image processing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009033423A (en) * 2007-07-26 2009-02-12 Hitachi Ltd Image compression method and image processing device

Also Published As

Publication number Publication date
JP2788714B2 (en) 1998-08-20

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