JPH0715457A - Digital communication switchover system - Google Patents
Digital communication switchover systemInfo
- Publication number
- JPH0715457A JPH0715457A JP5147441A JP14744193A JPH0715457A JP H0715457 A JPH0715457 A JP H0715457A JP 5147441 A JP5147441 A JP 5147441A JP 14744193 A JP14744193 A JP 14744193A JP H0715457 A JPH0715457 A JP H0715457A
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- JP
- Japan
- Prior art keywords
- image
- monitor
- node
- camera
- output
- 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.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ループＬＡＮ（Ｌocal
Ａrea Ｎetwork）において、１つのノードに接続され
ているカメラの画像を他のノードに接続されているカメ
ラの画像に切り替えてモニタに出力するディジタル通信
切替方式に関し、特にモニタ側ノードに接続された指示
パネルからの指示によって複数のカメラの画像を自由に
切り替えることができるようにしたディジタル通信切替
方式に関する。BACKGROUND OF THE INVENTION The present invention relates to a loop LAN (Local).
Area Network) is related to the digital communication switching method of switching the image of the camera connected to one node to the image of the camera connected to another node and outputting it to the monitor, especially the instruction connected to the monitor side node. The present invention relates to a digital communication switching system in which images from a plurality of cameras can be freely switched by an instruction from a panel.
【０００２】[0002]
【従来の技術】従来のループＬＡＮ（Ｌocal Ａrea Ｎe
twork）においては、通信する相手側ノードを変更する
ためには、ノードの制御部間で切替指示を伝達する必要
があった。例えば、モニタに出力する画像を、あるノー
ドに接続されたカメラの画像から他のノードに接続され
たカメラの画像に切り替えるために、ループの管理装置
やモニタがノードで切替指示を受けて、各ノードの制御
部間で通信を行って該切替指示を伝達しなければなら
ず、このために、各ノードの制御部にノード間通信用の
ハードウエアおよび通信制御用／切替制御用のソフトウ
エアを設ける必要があった。このようなループＬＡＮに
ついての従来技術は、例えば、特開平０１−０６４４３
６号公報に記載されている。2. Description of the Related Art A conventional loop LAN (Local Area Ne)
In twork), in order to change the communicating partner node, it was necessary to transmit a switching instruction between the control units of the nodes. For example, in order to switch the image output to the monitor from the image of the camera connected to a certain node to the image of the camera connected to another node, the loop management device or monitor receives a switching instruction at the node, and Communication between the control units of the nodes must be carried out and the switching instruction must be transmitted. For this purpose, the control unit of each node is provided with hardware for communication between nodes and software for communication control / switching control. It was necessary to provide. A conventional technique for such a loop LAN is disclosed in, for example, Japanese Patent Laid-Open No. 01-06443.
No. 6 publication.
【０００３】[0003]
【発明が解決しようとする課題】上述したように、従来
のループＬＡＮにおいては、例えば、ノードに接続する
カメラの画像を切り替える場合、ループの管理装置やモ
ニタがノードで切替指示を受けて、ノードの制御部間で
通信を行って切替指示を伝達して切り替えを行う必要が
あるため、制御部にノード間通信用のハードウエアおよ
び通信制御・切替制御用のソフトウエアを必要とすると
いう問題があった。また、カメラの画像を切り替える場
合、切替タイミングと画像のフレーム同期タイミングと
を一致させて行うことができないため、モニタへの画像
出力が同期ズレによって乱れてしまうという問題があっ
た。さらに、ノードの故障などでループへの画像の出力
が停止し最後の画像データがループ上に残ってしまうな
どの異常が発生した場合、その異常を検出することがで
きないという問題があった。また、このときモニタへの
画像出力を停止できないため、異常な画像がモニタに表
示されてしまうという問題があった。As described above, in the conventional loop LAN, for example, when switching the image of the camera connected to the node, the loop management device or monitor receives the switching instruction at the node, and the node is switched to the node. Since it is necessary to perform communication between the control units of the nodes and to transmit the switching instruction to perform switching, there is a problem that the control unit requires hardware for inter-node communication and software for communication control / switch control. there were. Further, when switching the image of the camera, it is impossible to match the switching timing with the frame synchronization timing of the image, so that there is a problem that the image output to the monitor is disturbed by the synchronization shift. Further, when an abnormality occurs such that the output of the image to the loop is stopped due to a failure of the node and the last image data remains on the loop, there is a problem that the abnormality cannot be detected. Further, at this time, there is a problem that an abnormal image is displayed on the monitor because the image output to the monitor cannot be stopped.
【０００４】[0004]
【問題を解決する手段】本発明は、上記問題点を解決す
るために、ループＬＡＮの伝送フレーム中に、出力指示
情報、画像同期信号情報、および応答監視情報の各エリ
アを設け、さらに、出力指示情報に従ってループのノー
ドに接続するカメラの画像を出力する機能、画像同期信
号を伝送する機能、およびノードからループに出力され
る画像データの出力が正常であるか否かを監視する機能
を設けている。In order to solve the above problems, the present invention provides areas for output instruction information, image synchronization signal information, and response monitoring information in a transmission frame of a loop LAN, and further outputs Provided with the function to output the image of the camera connected to the loop node according to the instruction information, the function to transmit the image synchronization signal, and the function to monitor whether the output of the image data output from the node to the loop is normal or not. ing.
【０００５】[0005]
【作用】本発明は、ループＬＡＮの伝送フレーム中に、
出力指示情報を設け、モニタ側ノードに接続した指示パ
ネルからの切替指示に従った出力指示をカメラ側ノード
に伝送し、出力指示を受けたノードが接続されたカメラ
の画像をループに出力することによって切り替えを行う
ことによって、ノードの制御部間の通信用のハードウエ
アおよび通信制御・切替制御用のソフトウエアを必要と
せずに、複数のノードに接続されているカメラ画像を自
由に切り替えることができるようになった。容易に実現
できる。また、伝送フレーム中に画像同期信号情報を設
け、モニタ側ノードに接続された画像同期信号発生器か
らの画像同期信号をループを介してノードに接続された
各カメラに伝え、各カメラの画像信号の同期を取り、か
つノードの出力指示情報の更新を画像同期信号に合わせ
て行うことによって、切替タイミングと画像のフレーム
同期タイミングを合わせ、切替時のモニタへの画像の乱
れを防止することができるようになった。さらに、伝送
フレーム中に応答監視情報を設け、出力指示をしたノー
ドからの出力であるか、異常な画像データがループ上に
残っていないかを監視することにより、異常検出時には
モニタへの画像の出力を停止することができるようにな
った。According to the present invention, during the transmission frame of the loop LAN,
Providing output instruction information, transmitting the output instruction according to the switching instruction from the instruction panel connected to the monitor side node to the camera side node, and outputting the image of the camera to which the node that received the output instruction is connected to the loop By switching by using, it is possible to freely switch camera images connected to multiple nodes without requiring hardware for communication between the control units of the nodes and software for communication control / switch control. I can do it now. Easy to implement. Also, the image synchronization signal information is provided in the transmission frame, and the image synchronization signal from the image synchronization signal generator connected to the monitor side node is transmitted to each camera connected to the node via a loop, and the image signal of each camera is transmitted. And the output instruction information of the node is updated in synchronization with the image synchronization signal, it is possible to align the switching timing with the frame synchronization timing of the image and prevent the disturbance of the image on the monitor at the time of switching. It became so. Furthermore, by providing response monitoring information in the transmission frame and monitoring whether the output is from the node that has instructed to output or whether abnormal image data remains on the loop, the image to the monitor is displayed when an abnormality is detected. You can now stop the output.
【０００６】[0006]
【実施例】本発明の実施例のシステム構成図を図１に示
す。図１において、１は伝送路、２Ａ、２Ｂ、２Ｃおよ
び２Ｄはノード、３はモニタ、４は指示パネル、５は画
像同期信号発生器、６１、６２および６３はカメラであ
る。ノード２Ａ〜２Ｄは、伝送路１によってループ状に
接続され、モニタ側のノード２Ａにはモニタ３、指示パ
ネル４、および画像同期信号発生器５が接続されてい
る。カメラ側のノード２Ｂ〜２Ｄにはそれぞれカメラ６
１〜６３が接続され、カメラ６１〜６３の画像を指示パ
ネル４の指示で切り替えてモニタ３に表示するようにな
っている。このシステムは、例えば、監視カメラのシス
テムとして利用されるものである。FIG. 1 shows a system configuration diagram of an embodiment of the present invention. In FIG. 1, 1 is a transmission line, 2A, 2B, 2C and 2D are nodes, 3 is a monitor, 4 is an instruction panel, 5 is an image synchronization signal generator, and 61, 62 and 63 are cameras. The nodes 2A to 2D are connected in a loop by the transmission path 1, and the monitor 3, the instruction panel 4, and the image synchronization signal generator 5 are connected to the node 2A on the monitor side. The cameras 6 are attached to the nodes 2B to 2D on the camera side, respectively.
1 to 63 are connected, and the images of the cameras 61 to 63 are switched by the instruction of the instruction panel 4 and displayed on the monitor 3. This system is used as a surveillance camera system, for example.
【０００７】本発明における伝送フレーム７の構成例を
図２に示す。この例は、ループ状の伝送路１上を１２５
μＳ周期で周回する場合の２４３０バイトからなる伝送
フレームの構成例である。図２に示されたように、本発
明における伝送フレームは、伝送フレームのフレーム同
期をとるための同期パターンＳＹＮエリア７１、モニタ
側のノード２Ａからカメラ側のノード２Ｂ〜２Ｄへ制御
データを伝えるための制御データエリア７２、カメラ側
のノード２Ｂ〜２Ｄからモニタ側のノード２Ａへデータ
を伝えるためのヘッダエリア７３と画像データエリア７
４、および未使用フィールド７５より構成される。制御
データは、指示パネル４からの指示に従って生成されカ
メラの画像をループに出力するノードを指示する２バイ
トの出力指示情報７２１と、画像同期信号発生器５の画
像同期信号をモニタ側のノード２Ａで受けてカメラ側の
ノード２Ｂ〜２Ｄに伝えるための４バイトの画像同期信
号情報７２２より構成される。FIG. 2 shows an example of the structure of the transmission frame 7 according to the present invention. In this example, 125 is set on the loop-shaped transmission line 1.
It is a configuration example of a transmission frame composed of 2430 bytes in the case of circulating in a μS cycle. As shown in FIG. 2, the transmission frame according to the present invention has a synchronization pattern SYN area 71 for frame synchronization of the transmission frame, and transmits control data from the monitor side node 2A to the camera side nodes 2B to 2D. Control data area 72, a header area 73 and an image data area 7 for transmitting data from the nodes 2B to 2D on the camera side to the node 2A on the monitor side.
4 and unused field 75. The control data is generated in accordance with an instruction from the instruction panel 4, and outputs 2-byte output instruction information 721 for instructing a node that outputs a camera image to the loop, and an image synchronization signal from the image synchronization signal generator 5 to the node 2A on the monitor side. It is composed of 4 bytes of image synchronization signal information 722 to be received by and transmitted to the nodes 2B to 2D on the camera side.
【０００８】ヘッダエリア７３は、ループに出力するカ
メラ側ノードのアドレス（例えば、“３”）を入れる２
バイトの応答監視情報７３１と、走査線１ライン分の情
報で構成される同画像データが何番目の走査のデータか
を示す２バイトの画像ライン番号７３２から構成され
る。応答監視情報７３１は、モニタ側のノード２Ａにお
いて、出力指示をしたカメラ側ノード（図１の例ではノ
ード２Ｃ）から正しく画像データが出力されているかを
監視し、かつモニタ側のノード２Ａを通過するときにオ
ール“０”に書き替えることで無効な画像データがルー
プを周回することを検出するために使用される。画像ラ
イン番号７３２は、モニタ側のノード２Ａで画像フレー
ムの先頭の画像データを識別するために使用される。The header area 73 contains the address (for example, "3") of the camera side node to be output to the loop. 2
Byte response monitor information 731 and 2-byte image line number 732 indicating the number of scans of the same image data that is composed of information for one scanning line. The response monitoring information 731 monitors whether the image data is correctly output from the camera side node (node 2C in the example of FIG. 1) that has issued the output instruction in the monitor side node 2A, and passes the monitor side node 2A. By rewriting it to all “0” when it is performed, it is used to detect that invalid image data goes around the loop. The image line number 732 is used by the node 2A on the monitor side to identify the image data at the beginning of the image frame.
【０００９】図３は、本発明におけるノードの構成例を
示す図である。図３に示されるように、ノードは伝送路
アクセス部２１と画像送受信部２２から構成されてい
る。伝送アクセス部２１は伝送路１から伝送フレームを
受け取り、画像送受信部２２に受信データと伝送フレー
ム同期信号を送り、また画像送受信部２２から送信デー
タと送信要求を受け取り、さらに伝送路１に伝送フレー
ムを送出する。画像送受信部２２は、後述するように、
モニタ側のノードの画像受信部（図４参照）とカメラ側
ノードの画像送信部（図６参照）がある。FIG. 3 is a diagram showing a configuration example of a node in the present invention. As shown in FIG. 3, the node includes a transmission path access unit 21 and an image transmission / reception unit 22. The transmission access unit 21 receives the transmission frame from the transmission line 1, sends the reception data and the transmission frame synchronization signal to the image transmission / reception unit 22, receives the transmission data and the transmission request from the image transmission / reception unit 22, and further transmits the transmission frame to the transmission line 1. Is sent. The image transmitting / receiving unit 22 is, as described later,
There is an image receiving unit (see FIG. 4) of the monitor side node and an image transmitting unit (see FIG. 6) of the camera side node.
【００１０】次に、モニタ側のノードの画像受信部とカ
メラ側ノードの画像送信部について説明する。先ず、図
４を用いて、モニタ側ノードの画像受信部での制御デー
タの送信動作を詳細に説明する。図４において、画像同
期信号発生器５から入力した画像同期信号は、画像同期
インタフェース部２０１を介し、クロック同期部２０２
でノードの動作クロックに同期させてから、画像同期信
号情報生成部２０３に伝えられる。画像同期信号情報生
成部２０３の具体的な回路例を図５に、また画像同期信
号情報生成部２０３の信号タイムチャートを図８に示
す。Next, the image receiving section of the monitor side node and the image transmitting section of the camera side node will be described. First, the control data transmission operation in the image reception unit of the monitor-side node will be described in detail with reference to FIG. In FIG. 4, the image synchronization signal input from the image synchronization signal generator 5 is passed through the image synchronization interface unit 201 and the clock synchronization unit 202.
The signal is transmitted to the image synchronization signal information generation unit 203 after being synchronized with the operation clock of the node. A specific circuit example of the image synchronization signal information generation unit 203 is shown in FIG. 5, and a signal time chart of the image synchronization signal information generation unit 203 is shown in FIG.
【００１１】図５において、カウンタ２０３１（例え
ば、３２ビット）は、伝送フレーム同期信号Ａによって
リセットされ、ノードの動作クロックＣに合わせてカウ
ントアップする。画像同期信号Ｂが入ってくると該画像
同期信号Ｂのパルスで送信Ｆ／Ｆ２０３２にそのときの
カウンタ２０３１の値（例えば、“４”）がセットされ
る。これにより画像同期信号Ｂのパルスの位置を伝送フ
レーム同期信号Ａとの相対位置で示す画像同期信号情報
（４バイトすなわち３２ビット）を生成する。生成した
画像同期信号情報は、送信バッファ２０４に送られ、伝
送フレーム中の所定のタイミングでループ上に送信され
る。In FIG. 5, the counter 2031 (for example, 32 bits) is reset by the transmission frame synchronization signal A and counts up in accordance with the operation clock C of the node. When the image synchronization signal B comes in, the value of the counter 2031 at that time (for example, "4") is set in the transmission F / F 2032 by the pulse of the image synchronization signal B. As a result, image synchronization signal information (4 bytes, that is, 32 bits) indicating the position of the pulse of the image synchronization signal B by the relative position to the transmission frame synchronization signal A is generated. The generated image synchronization signal information is sent to the transmission buffer 204 and is sent on the loop at a predetermined timing in the transmission frame.
【００１２】図４において、指示パネル４からの切替指
示信号は、指示パネルインターフェース部２０５を介し
て出力指示レジスタ２０６に出力指示ノードのアドレス
（例えば、値“３”）としてセットされる。このセット
のタイミングは画像のフレーム同期タイミングと切替タ
イミングと合わせるために、画像同期信号Ｂのパルスに
合わせて行う。出力指示レジスタ２０６にセットされた
出力指示情報は、送信バッファ２０４に送られ、伝送フ
レーム中の所定のタイミングでループ上に送信される。In FIG. 4, the switching instruction signal from the instruction panel 4 is set in the output instruction register 206 via the instruction panel interface unit 205 as the address (for example, the value "3") of the output instruction node. This set timing is performed in synchronization with the pulse of the image synchronization signal B in order to match the frame synchronization timing of the image and the switching timing. The output instruction information set in the output instruction register 206 is sent to the transmission buffer 204 and sent on the loop at a predetermined timing in the transmission frame.
【００１３】以上はモニタ側ノードにおいて、制御デー
タ（出力指示情報および画像同期信号情報）を伝送フレ
ームにのせる説明であるが、モニタ側ノードにおける伝
送フレーム中の制御データ以外の部分については、オー
ル“０”が送信され、それによって応答監視情報などの
クリア処理が行われる。なお、モニタ側ノードにおいて
は、伝送路アクセス部２１において画像受信部２２に対
する受信がクリア処理より先に行われるので、このクリ
ア処理が正常な画像データを破壊することはない。この
ようにして生成されたモニ側ノードの出力する伝送フレ
ームの例を図１０に示す。上述したように、モニ側ノー
ドの出力する伝送フレームは制御データ部にだけ情報
（出力指示情報と画像同期信号情報）が入り、その他は
オール“０”が入っている。In the above description, control data (output instruction information and image synchronization signal information) is placed on the transmission frame at the monitor side node. However, all parts other than the control data in the transmission frame at the monitor side node are "0" is transmitted, whereby clearing processing of response monitoring information and the like is performed. In the monitor-side node, the transmission path access unit 21 receives the image reception unit 22 before the clear processing, and therefore the clear processing does not destroy normal image data. An example of the transmission frame output from the moni side node generated in this way is shown in FIG. As described above, the transmission frame output from the node on the moni side contains information (output instruction information and image synchronization signal information) only in the control data portion, and all other "0" s.
【００１４】次に、図６を用いて、カメラ側ノードの画
像送信部での制御データの受信動作を説明する。図６に
おいて、カメラ側ノードの画像送信部では、伝送フレー
ム中のデータを所定タイミングで受信し、受信バッファ
部２５１に取り込む。伝送フレーム中の制御データのう
ち、出力指示情報は、出力指示検出部２５２において自
分のノードアドレスと比較され、一致した場合に送信バ
ッファ部２６０に対して出力指示が出される。一方、伝
送フレーム中の画像同期信号情報は、画像同期信号再生
部２５３に渡され、そこで画像同期信号が再生され画像
同期信号出力部２５４を介してカメラに送出される。Next, the control data receiving operation in the image transmitting unit of the camera side node will be described with reference to FIG. In FIG. 6, the image transmission unit of the camera-side node receives the data in the transmission frame at a predetermined timing and takes it into the reception buffer unit 251. Of the control data in the transmission frame, the output instruction information is compared with its own node address in the output instruction detection unit 252, and if they match, an output instruction is issued to the transmission buffer unit 260. On the other hand, the image synchronization signal information in the transmission frame is passed to the image synchronization signal reproduction unit 253, where the image synchronization signal is reproduced and sent to the camera via the image synchronization signal output unit 254.
【００１５】画像同期信号再生部２５３の具体的な回路
例を図７に、また画像同期信号再生部２５３の回路の信
号タイムチャートを図９に示す。図７において、カウン
タ２５３１は、伝送フレーム同期信号Ａによってリセッ
トされノードの動作クロックＣに合わせてカウントアッ
プする。このカウンタ２５３１の値と受信した画像同期
信号情報の値との一致を一致検出部２５３２で検出し、
パルスを生成する。該画像同期信号情報は、画像同期信
号のパルスの位置を伝送フレーム同期信号との相対位置
で示しているので、このパルスで画像同期信号が再生で
きる。FIG. 7 shows a concrete circuit example of the image synchronizing signal reproducing section 253, and FIG. 9 shows a signal time chart of the circuit of the image synchronizing signal reproducing section 253. In FIG. 7, the counter 2531 is reset by the transmission frame synchronization signal A and counts up according to the operation clock C of the node. The coincidence detection unit 2532 detects the coincidence between the value of the counter 2531 and the value of the received image synchronization signal information,
Generate a pulse. Since the image synchronization signal information indicates the position of the pulse of the image synchronization signal as a relative position to the transmission frame synchronization signal, the image synchronization signal can be reproduced by this pulse.
【００１６】次に、カメラ側ノードの画像送信部におけ
るヘッダエリア７３および画像データエリア７４の送信
動作を説明する。図６において、画像入力部２５５を介
して取り込まれたカメラからの画像は、Ａ／Ｄ（アナロ
グ／ディジタル）変換部２５６でディジタルデータに変
換され、８ビットのディジタルデータとして送信画像フ
レームバッファ制御部２５７を介して送信画像フレーム
バッファ部２５８に書き込まれる。このとき、画像フレ
ーム／ライン同期検出部２５９によって、入力される画
像から画像のフレーム／ラインの同期を検出し、送信画
像フレームバッファ制御部２５７を制御することによっ
て、送信画像フレームバッファ部２５８にはライン単位
の情報としてフレーム毎に書き込むようにされている。
また、画像ライン番号としてライン単位にライン番号
が、応答監視情報として自ノードアドレスが合わされ
て、ヘッダとして書き込まれる。送信画像フレームバッ
ファ部２５８に書き込まれたヘッダ／画像データは、出
力指示検出部２５２からの出力指示に従って、送信バッ
ファ部２６０からループ上に伝送フレーム中の所定のタ
イミングで送信される。このときの伝送フレームを図１
１に示す。なお、送信の開始は、画像フレームに同期し
て行われる。Next, the transmission operation of the header area 73 and the image data area 74 in the image transmission section of the camera side node will be described. In FIG. 6, the image from the camera captured through the image input unit 255 is converted into digital data by an A / D (analog / digital) conversion unit 256, and is transmitted as an 8-bit digital data frame buffer control unit. It is written in the transmission image frame buffer unit 258 via 257. At this time, the image frame / line synchronization detection unit 259 detects the frame / line synchronization of the image from the input image, and controls the transmission image frame buffer control unit 257 to cause the transmission image frame buffer unit 258 to operate. The information is written for each frame as line unit information.
In addition, the line number is aligned in line units as the image line number, and the own node address is matched as the response monitoring information and written as a header. The header / image data written in the transmission image frame buffer unit 258 is transmitted from the transmission buffer unit 260 onto the loop at a predetermined timing in the transmission frame according to the output instruction from the output instruction detection unit 252. Figure 1 shows the transmission frame at this time.
Shown in 1. The transmission is started in synchronization with the image frame.
【００１７】次に、モニタ側ノードの画像受信部でのヘ
ッダ／画像データの受信動作を示す。図４の画像受信部
において、伝送フレーム中の所定のタイミングで受信さ
れるヘッダ／画像データは、受信バッファ部２０７に取
り込まれ、応答監視情報チェック部２０８でヘッダ内の
応答監視情報と出力指示レジスタ２０６の値と比較チェ
ックされ、不一致ならば異常な画像データとして破棄さ
れ、かつモニタへの画像の出力が停止される。応答監視
情報と出力指示レジスタ２０６の値が一致していれば、
ヘッダ内の画像ライン番号エリアの示すライン番号に合
わせて、受信した画像データが受信画像フレームバッフ
ァ部２１０にライン単位で書き込まれる。書き込まれた
画像データは、Ｄ／Ａ（ディジタル／アナログ）変換部
２１１でアナログ信号に変換されて画像出力部２１２を
介してモニタ３に伝えられる。画像出力部２１２はスイ
ッチから構成され、応答監視情報チェック部２０８から
の一致信号（正常）によりオンになり出力が行われる。
以上の動作によって、図１に示すシステムを実現するこ
とができる。Next, the operation of receiving the header / image data in the image receiving unit of the monitor side node will be described. The header / image data received at a predetermined timing in the transmission frame in the image receiving unit of FIG. 4 is taken into the reception buffer unit 207, and the response monitoring information check unit 208 receives the response monitoring information in the header and the output instruction register. The value of 206 is compared and checked, and if they do not match, they are discarded as abnormal image data, and the output of the image to the monitor is stopped. If the response monitoring information and the value of the output instruction register 206 match,
The received image data is written line by line in the received image frame buffer unit 210 in accordance with the line number indicated by the image line number area in the header. The written image data is converted into an analog signal by the D / A (digital / analog) conversion unit 211 and transmitted to the monitor 3 via the image output unit 212. The image output unit 212 is composed of a switch, and is turned on and output by the coincidence signal (normal) from the response monitoring information check unit 208.
With the above operation, the system shown in FIG. 1 can be realized.
【００１８】[0018]
【発明の効果】上述したように、本発明によれば、ルー
プＬＡＮの伝送フレーム中に出力指示情報を設け、モニ
タ側ノードに接続した指示パネルからの切替指示に従っ
た出力指示をカメラ側ノードに伝送し、出力指示を受け
たノードに接続されたカメラから画像データをループ伝
送路に出力することによって切替を行うようにして、ノ
ードの制御部間の通信用のハードウエアおよび通信制御
・切替制御用のソフトウエアを必要とせずに容易にカメ
ラの画像の切替が実現できるようになった。また、伝送
フレーム中に画像同期信号情報を設け、モニタ側ノード
に接続された画像同期信号発生器からの画像同期信号を
カメラに伝え、各カメラ間の画像フレームの同期を合わ
せ、かつ出力指示情報の更新を画像同期信号に合わせて
行うことによって、切替タイミングと画像のフレーム同
期タイミングを一致させ、切替時にモニタへの画像の出
力が同期ズレにより乱れることを防止することができ
る。さらに、伝送フレーム中に応答監視情報を設け、出
力指示をしたノードからの出力があるかを確認し、異常
な画像データがループ上に残っていないかを監視し、異
常検出時にはモニタへの画像の出力を停止することがで
きるため、異常な画像のモニタ出力を防止できる。As described above, according to the present invention, the output instruction information is provided in the transmission frame of the loop LAN, and the output instruction according to the switching instruction from the instruction panel connected to the monitor side node is output to the camera side node. Hardware and communication control and switching between the control units of the nodes by transmitting the image data from the camera connected to the node that receives the output instruction to the loop transmission line to output the image data. It is now possible to easily switch camera images without the need for control software. In addition, the image synchronization signal information is provided in the transmission frame, the image synchronization signal from the image synchronization signal generator connected to the monitor side node is transmitted to the cameras, the image frames between the cameras are synchronized, and the output instruction information is provided. Is updated in accordance with the image synchronization signal, it is possible to match the switching timing with the frame synchronization timing of the image and prevent the output of the image to the monitor from being disturbed due to the synchronization shift at the time of switching. In addition, response monitoring information is provided in the transmission frame to check if there is output from the node that issued the output instruction, and to monitor whether abnormal image data remains on the loop. Since the output of can be stopped, it is possible to prevent the abnormal image from being output to the monitor.
【図１】本発明の実施例であるループＬＡＮおよびモニ
タ／カメラのシステム構成図と各データの流れを示した
図である。FIG. 1 is a diagram showing a system configuration diagram of a loop LAN and a monitor / camera according to an embodiment of the present invention and a flow of each data.
【図２】本発明におけるループＬＡＮを周回する伝送フ
レームの構成図である。FIG. 2 is a configuration diagram of a transmission frame that goes around a loop LAN according to the present invention.
【図３】本発明におけるノードの構成図である。FIG. 3 is a configuration diagram of a node in the present invention.
【図４】本発明におけるモニタ側ノードの画像受信部の
構成図である。FIG. 4 is a configuration diagram of an image receiving unit of a monitor side node in the present invention.
【図５】モニタ側ノードの画像同期信号情報生成部の構
成図である。FIG. 5 is a configuration diagram of an image synchronization signal information generation unit of a monitor side node.
【図６】カメラ側ノードの画像受信部の構成図である。FIG. 6 is a configuration diagram of an image receiving unit of a camera side node.
【図７】カメラ側ノードの画像同期信号情報生成部の回
路図である。FIG. 7 is a circuit diagram of an image synchronization signal information generation unit of a camera side node.
【図８】モニタ側ノードの信号タイムチャートである。FIG. 8 is a signal time chart of a monitor side node.
【図９】カメラ側ノードの信号タイムチャートである。FIG. 9 is a signal time chart of a camera side node.
【図１０】モニタ側ノードから出力される伝送フレーム
の一例である。FIG. 10 is an example of a transmission frame output from a monitor side node.
【図１１】カメラ側ノードから出力される伝送フレーム
の一例である。FIG. 11 is an example of a transmission frame output from the camera side node.
１ 伝送路 ２、２Ａ、２Ｂ、２Ｃ、２Ｄ ノード ３ モニタ ４ 指示パネル ５ 画像同期信号発生器 ７ 伝送フレーム ２１ 伝送路アクセス部 ２２ 画像送受信部 ６１、６２、６３ カメラ ７１ ＳＹＮ（フレーム同期のための同期パターン） ７２ 制御データエリア ７３ ヘッダエリア ７４ 画像データエリア ７５ 未使用フィールド ２０１ 画像同期インタフェース部 ２０２ クロック同期部 ２０３ 画像同期信号情報生成部 ２０４、２６０ 送信バッファ部 ２０５ 指示パネル入力インタフェース部 ２０６ 出力指示レジスタ ２０７、２５１ 受信バッファ部 ２０８ 応答監視情報チェック部 ２０９ 受信画像フレームバッファ制御部 ２１０ 受信画像フレームバッファ部 ２１１ Ｄ／Ａ変換部 ２１２ 画像出力部 ２５２ 出力指示検出部 ２５３ 画像同期信号再生部 ２５４ 画像同期信号出力部 ２５５ 画像入力部 ２５６ Ａ／Ｄ変換部 ２５７ 送信画像フレームバッファ制御部 ２５８ 送信画像フレームバッファ部 ２５９ 画像フレーム／ライン同期検出部 ２０３１、２５３１ カウンタ ７２１ 出力指示情報 ７２２ 画像同期信号情報 ７３１ 応答監視情報 ７３２ 画像ライン番号 1 transmission line 2, 2A, 2B, 2C, 2D node 3 monitor 4 instruction panel 5 image synchronization signal generator 7 transmission frame 21 transmission line access unit 22 image transmission / reception unit 61, 62, 63 camera 71 SYN (for frame synchronization) Synchronization pattern) 72 Control data area 73 Header area 74 Image data area 75 Unused field 201 Image synchronization interface unit 202 Clock synchronization unit 203 Image synchronization signal information generation unit 204, 260 Transmission buffer unit 205 Instruction panel input interface unit 206 Output instruction register 207, 251 Reception buffer unit 208 Response monitoring information check unit 209 Reception image frame buffer control unit 210 Reception image frame buffer unit 211 D / A conversion unit 212 Image output unit 252 Output instruction detection unit 253 Image synchronization Signal reproduction unit 254 Image synchronization signal output unit 255 Image input unit 256 A / D conversion unit 257 Transmission image frame buffer control unit 258 Transmission image frame buffer unit 259 Image frame / line synchronization detection unit 2031, 2531 Counter 721 Output instruction information 722 image Sync signal information 731 Response monitoring information 732 Image line number
───────────────────────────────────────────────────── フロントページの続き (72)発明者 古澤 猛 神奈川県秦野市堀山下１番地 株式会社日 立コンピュータエレクトロニクス内 (72)発明者 杉本 録紀 神奈川県秦野市堀山下１番地 株式会社日 立コンピュータエレクトロニクス内 (72)発明者 大矢 陽一 神奈川県海老名市下今泉810番地 株式会 社日立製作所オフィスシステム事業部内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Furusawa 1 Horiyamashita, Hinoyamashita, Hadano City, Kanagawa Prefecture, Japan Computer Electronics Co., Ltd. In Electronics (72) Inventor Yoichi Oya 810 Shimoimaizumi, Ebina City, Kanagawa Stock Company Hitachi, Ltd. Office Systems Division
Claims (4)
ード）とカメラが接続される複数のノード（カメラ側ノ
ード）と、これら複数のノードをループ状に接続する伝
送路から構成され、上記カメラからの画像データを上記
伝送路を介して伝送し上記モニタに出力するループＬＡ
Ｎにおいて、伝送フレーム中に、ディジタル化した画像
データを保持する画像データエリアと、指示パネルから
入力されるカメラ側ノードを特定する情報を保持する出
力指示情報エリアを設けたことを特徴とするディジタル
通信切替方式。1. A camera including a node to which a monitor is connected (a node on the monitor side), a plurality of nodes to which a camera is connected (a node on the camera side), and a transmission line which connects the plurality of nodes in a loop. Loop LA for transmitting image data from the monitor via the transmission path and outputting to the monitor
In N, the transmission frame is provided with an image data area for holding digitized image data and an output instruction information area for holding information for specifying a camera-side node input from the instruction panel. Communication switching method.
において、上記伝送フレーム中に、さらに伝送路に画像
データを送出したカメラを特定する情報を保持する応答
監視情報エリアを設け、上記出力指示情報エリアの内容
と上記応答監視情報エリアの内容を参照することによっ
て、出力指示されたカメラから伝送路に画像の出力が正
しくなされているかを監視するようにしたことを特徴と
する伝送フレーム通信切替方式。2. The digital communication switching system according to claim 1, wherein the transmission frame further comprises a response monitoring information area for holding information specifying a camera that has sent image data to the transmission path, and the output instruction information is provided. A transmission frame communication switching method characterized in that by referring to the contents of the area and the contents of the response monitoring information area, it is possible to monitor whether or not an image is correctly output from the camera instructed to output to the transmission path. .
において、上記応答監視情報エリアをモニタ側ノードで
伝送フレームの周回毎にクリアすることによって、カメ
ラ側ノードの故障等でループへの出力が停止し伝送路上
に古い画像データが残っていた場合にそれをモニタ側ノ
ードで検出してモニタへの出力を停止するようにしたこ
とを特徴とするディジタル通信切替方式。3. The digital communication switching system according to claim 2, wherein the response monitoring information area is cleared by the monitor side node every time the transmission frame goes around, so that the output to the loop is stopped due to a failure of the camera side node or the like. The digital communication switching method is characterized in that when old image data remains on the transmission line, it is detected by the monitor side node and output to the monitor is stopped.
切替方式において、伝送フレーム中に、画像同期信号情
報を保持するの画像同期信号情報エリアを設け、モニタ
側ノードに接続された画像同期信号発生器からの画像同
期信号を上記伝送路を介してカメラ側ノードに接続され
た各カメラに伝え、各カメラの画像フレームの同期をと
り、かつ、ノードの画像出力の切替を画像同期信号に合
わせて行うようにしたことを特徴とするディジタル通信
切替方式。4. The digital communication switching system according to claim 1, wherein an image synchronization signal information area for holding image synchronization signal information is provided in a transmission frame, and an image synchronization signal generation is connected to a monitor side node. The image synchronization signal from the device is transmitted to each camera connected to the camera side node via the above transmission path, the image frame of each camera is synchronized, and the switching of the image output of the node is synchronized with the image synchronization signal. A digital communication switching system characterized by being carried out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5147441A JPH0715457A (en) | 1993-06-18 | 1993-06-18 | Digital communication switchover system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5147441A JPH0715457A (en) | 1993-06-18 | 1993-06-18 | Digital communication switchover system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0715457A true JPH0715457A (en) | 1995-01-17 |
Family
ID=15430413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5147441A Pending JPH0715457A (en) | 1993-06-18 | 1993-06-18 | Digital communication switchover system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0715457A (en) |
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-
1993
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