JP4115558B2 - Intermittent recording device - Google Patents

Intermittent recording device Download PDF

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Publication number
JP4115558B2
JP4115558B2 JP23737597A JP23737597A JP4115558B2 JP 4115558 B2 JP4115558 B2 JP 4115558B2 JP 23737597 A JP23737597 A JP 23737597A JP 23737597 A JP23737597 A JP 23737597A JP 4115558 B2 JP4115558 B2 JP 4115558B2
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recording
video signal
motion
detection circuit
recording device
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JPH1198455A (en
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靖幸 永野
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B31/00—Arrangements for the associated working of recording or reproducing apparatus with related apparatus
    • G11B31/006—Arrangements for the associated working of recording or reproducing apparatus with related apparatus with video camera or receiver
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/20—Analysis of motion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/78—Television signal recording using magnetic recording
    • H04N5/782—Television signal recording using magnetic recording on tape
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/90—Tape-like record carriers

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  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Television Signal Processing For Recording (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、映像信号を間欠的に記録する磁気記録装置に関する。
【０００２】
【従来の技術】
近時、銀行や店舗、あるいは車庫などのにおいて、その内部の状態を記録するため、間欠的に長時間記録する監視用ＶＴＲが設置されるようになってきている。従来の間欠記録方式を採用したＶＴＲ、所謂タイムラプスＶＴＲの記録動作は、入力された映像信号を磁気テープに記録し、一定時間待機する。そして、再び記録を開始し、また停止して一定時間待機し、記録を中止するまでこの動作を繰り返す。このようなタイムラプスＶＴＲでは、入力信号をただ記録するため、必要としない映像まで延々と記録を行っていた。このため、記録テープを無意味に消費し、ヘッドやテープの走行系の摩擦により寿命が著しく低下していた。この欠点を解決するものとして、例えば、特開平４−２４７７８３号公報に示される間欠型磁気記録装置がある。この間欠型磁気記録装置は、記録媒体に記録を行ったのと同一の映像信号を保存格納しておく記憶装置と、記録を行う条件として、取り込んだ映像信号と記録した映像信号とを比較する比較器と、一定時間毎に比較器の出力信号を調べ、変化があった場合のみ、入力された映像信号を磁気記録媒体に記録するように制御を行い、映像信号に変化が検出された映像信号のみ順次記録媒体へ記録するようにしている。このように制御することにより、ＶＴＲの耐久性の向上と、磁気テープの交換磁気の延長を図ることができる。
【０００３】
また、他の例として特開昭６３−５９２８２号公報には間欠記録ＶＴＲがある。これは、ＶＴＲに動き検出回路を設け、入力された映像信号に”動き”が検出されたら、間欠モードから連続記録モードに切り換えるようにしたものである。図４は上記特開平４−２４７７８３号公報に示された間欠記録装置を示し、映像信号を記録する記憶装置１と、記憶装置１の出力と記録装置に入力される映像信号とを比較する比較器２と、入力される映像信号を記録する磁気記録装置３と、比較器２の信号を一定間隔でサンプリングした信号をトリガーとして記憶装置１に映像信号を記憶させると共に、この映像信号を記録するように磁気記録装置に指令する制御装置４とから構成されている。この構成において、比較器２の出力信号を一定間隔で調べ変化を検出し、間欠記録動作を開始させることで、ＶＴＲの耐久性の向上と、磁気テープの交換時期の延長を図ることができる。
【０００４】
ここで、図５は図４の従来例におけるタイミングチャートを示す。
波形ａは比較器２の出力を制御回路４でサンプリングするパルスであり、波形ｂは、比較器２の出力信号を、また、波形ｃは制御回路４が映像信号記録装置を制御するパルスを表している。即ち、図４の装置においては、波形ａが波形ｂトリガーして波形ｃを作成するものである。したがって、図５に示す、動きが検出された区間ｄにおいては情報が記録されないこととなる。
【０００５】
また、図４において、記憶装置１と比較器２から構成されるブロックを考えた場合、このブロックは、動き検出回路とみることができる。したがって、前記特開昭６３−５９２８２号公報の間欠記録ＶＴＲが示す構成は、図４の構成と実質的同一とみることができる。
【０００６】
【発明が解決しようとする課題】
ところで、上述の特開平４−２４７７８３号公報の間欠型磁気記録装置によると、映像情報の変化を一定間隔で比較器により検出して記録するタイミングを決めているため、検出結果をみる間に変化が発生しても記録されない。間欠記録状態で、監視している映像に”動き”が検出されなかったら、新しい情報が磁気テープに記録されないので、正常に動作しているかどうか確認することができない。また、特開昭６３−５９２８２号公報の間欠記録ＶＴＲによると、間欠記録状態から監視している映像に”動き”を検出したら無条件で、連続記録に移行することになるので、テープの消費量が増大する。
【０００７】
本発明は、上記問題点に鑑みなされたので、監視する映像信号の”動き”の量を検出し、この動き量に基づいて記録モードを設定するようにして記録テープの消費量の低減を図るとともに、ヘッドとテープの走行系の摩耗を最小限に減らしても、必要な録画を確保することができる間欠記録装置を提供することを目的とする。
【０００８】
【課題を解決するための手段】
上記課題は本願発明の以下の構成により解決される。
請求項１の発明の間欠記録装置は、監視している映像信号の動きを検出する動き検出回路と、前記動き検出回路が検出する動きの動き量を検出する動き量検出回路と、前記監視している映像信号を磁気テープに記録する映像信号記録装置と、前記動き量検出回路の情報により前記映像信号記録装置を制御する制御回路とから構成され、前記動き量検出回路の出力信号の大小により前記映像信号記録装置が間欠記録する記録間隔を変化させるようにすると共に前記動き量検出回路に出力がない場合は映像信号の記録を停止し、前記磁気テープが収容される筐体内に記憶素子を設け、監視している映像に動きがないことにより磁気テープに映像信号が記録されない場合、映像に動きがないことを示す情報を、設定した一定の時間間隔で前記記憶素子に記憶させる構成とした。
【０００９】
請求項２の発明は、請求項１記載の間欠記録装置において、前記映像記録装置間欠記録する時間間隔を変化させるタイミングは、予め設定された間隔、又は前記動き検出回路からの出力信号に基づき行われる構成とした。
【００１０】
【発明の実施の形態】
以下、図面を参照して本発明の実施例を説明する。
図１は本発明の実施例に係る間欠記録装置のブロック構成図を示す。間欠記録装置は、動き検出回路５、動き量検出回路６、映像信号記録装置３、制御回路４及び記憶装置１を主要構成要素としている。
【００１１】
動き検出回路５は、監視カメラ等の撮像装置より出力され、デジタル信号に変換された映像信号が入力され、例えば、メモリを用いて、一定時間遅延された映像信号と現在の映像信号とを比較して画像に動きがあった場合にこれを検出する。動き検出回路５で検出された出力信号は、動き量検出回路６に入力され、監視している映像の動き量が検出される。検出された動き量の情報は、制御回路４に入力され、映像信号記録装置（ＶＴＲ）の間欠記録モードの制御を行う。
【００１２】
また、監視カメラからの映像信号は、記憶装置１に入力され、一定時間遅延されて映像信号記録装置に入力されて記録される。記憶装置１の容量は、制御回路４が映像信号記録装置３を最適に記録できる状態にするための判断に要するだけの時間があればよく、ここでは、１フィールド分、又は１フレーム分に設定する。
【００１３】
図２に図１に示した本発明の実施例にの間欠記録装置のタイミングチャートを示す。図２において、波形ｅは動き検出回路５の出力信号、波形ｆは動き量検出回路６の出力信号、波形ｇは制御回路４が映像信号記録装置３を制御する制御信号を示している。制御回路４より波形ｇが出力されている間、映像信号記録装置３に映像を記録させるようにする。
【００１４】
動き検出回路５で検出された信号ｅは、動き量検出回路６により、検出された信号の幅や数に基づいて監視している映像信号の動きの量として表す。波形ｆの振幅が高ければ動きが激しい物体を監視していることになる。
制御回路４は。動き量検出回路６の出力ｆを入力して、映像信号記録装置３の間欠記録モードを設定する。ここで、間欠記録モードの設定例について述べる。
【００１５】
例えば、動き量検出回路６の出力波形ｆが、振幅ｈであるとき、即ち、監視カメラが物体の動きを検出しているが、その動き量が比較的小さいとき、制御回路４は、例えば、４秒間隔で間欠記録を行わせる制御信号ｇを出力するように設定する。また、波形ｆが高い振幅である振幅ｉを示すときは、連続記録するように制御信号ｇを出力する。また、波形ｆがｊ程度の高さの振幅のときは、２秒間隔で間欠記録する制御信号ｇを出力する。なお、間欠記録する記録時間ｔ0 は、予め適宜設定する。また、間欠記録する時間間隔を変えるタイミングは、予め設定することもできるが、動き検出回路が動きを検出するタイミングで行うようにすることにより、記録すべき映像信号をもれなく的確に記録するこができる。
【００１６】
また、動き量検出回路６の出力がない区間では、記録動作を停止するように制御する。このように、制御回路４は、監視カメラが捉えている物体の動きとその動き量の程度により、映像信号記録装置３に記録させる間隔を制御するようにすることにより、必要な情報を的確に記録し、また、余分な映像を記録しないようにすることができる。
【００１７】
ところで、上記のような間欠記録モードにおいて、監視している映像信号に動きがない場合であっても、間欠装置が正常に作動しているかどうか確認する必要がある。そこで、本発明においては、更に、、磁気テープを収容する筐体内に記憶手段を配置し、この記憶手段に監視している映像信号に動きがないことを記憶させるようにしている。
【００１８】
図３は、本発明における映像信号記録装置３の構成図を示すものである。
入力された映像信号は、信号処理回路７で所定の信号処理が施される。処理された信号は、記録増幅回路８に入力されて増幅されてヘッド９に供給され、磁気テープ１０に記録される。本発明においては、磁気テープを収容する筐体１２内に記憶素子を備える情報記憶回路１１を設けている。そして、制御装置４は、この情報記憶回路１１に、監視している映像信号に動きがないとき、図２に示す波形ｋを情報記憶回路１１に出力し、監視している映像に動きがないことを記憶させる。ここでは、磁気テープ１０に映像信号が記録されないとき、情報記憶回路に予め定められた間隔ｔ1 で情報を記憶するようにしている。なお、この場合に記憶される情報は、計時手段（図示せず）からの時刻情報と共に記憶するようにする。また、情報記憶回路１１の記憶容量としては、例えば、２４時間の間の情報について記憶できるだけのものを設けておく。このように、磁気テープに映像信号が記録されないとき、映像信号に動きがないことを示す情報を、別途設けた情報記憶回路１１に記憶させておくとにより、磁気テープに映像信号が記録されていない期間についても、映像信号記憶装置３が正常に作動していることの確認ができ、また、監視している映像信号に動きがない期間を把握することが容易である。
【００１９】
【発明の効果】
請求項１の発明によれば、監視している映像信号に動きがある時のみ、映像信号を記録すると共に、動きの程度により、記録する間隔を変更するようにしているため、監視を確実に行うと共に、記録する磁気テープの消費量を大幅に減らすことができる。したがって、映像記録装置の走行系の摩耗を最小限にし、装置の耐久性も向上する。また、監視している映像信号の動きの度合いにより間欠記録する間隔を任意に設定することができ、監視する対象に合わせて最適の条件を設定することができる。また、監視している映像信号に動きがなく、磁気テープに記録されていなくても、動きがなかったことを示す情報が磁気テープの筐体内に設けた記憶素子に記憶されているため、これを後に確認することにより、映像信号記録装置が正常に作動していることの確認が可能となり、監視している映像信号に動きがない期間を把握することが容易となる。
【００２０】
請求項２の発明によれば、監視している映像信号に動きを検出すると予め設定された間隔以内であっても、直ちに記録動作に移行することができ、より多くの情報を情報量が得られ、監視すべき情報のもれを少なくすることができる。
【図面の簡単な説明】
【図１】本発明の実施例に係る間欠記録装置のブロック構成図である。
【図２】本発明の実施例におけるタイミングチャートである。
【図３】映像信号記録記録装置の構成を示す図である。
【図４】従来のメモリ回路を用いた間欠記録装置を示すブロック図である。
【図５】従来例におけるタイミングチャートを示す図である。
【符号の説明】
１ 記憶装置
２ 比較回路
３ 映像信号記録装置
４ 制御回路
５ 動き検出回路
６ 動き量検出回路
７ 信号処理回路
８ 記録増幅回路
９ ヘッド
１０ 磁気テープ
１１ 情報記憶回路[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic recording apparatus that records video signals intermittently.
[0002]
[Prior art]
Recently, in a bank, a store, a garage, or the like, in order to record the internal state, a monitoring VTR that records intermittently for a long time has been installed. In a recording operation of a VTR employing a conventional intermittent recording method, a so-called time lapse VTR, an input video signal is recorded on a magnetic tape and waits for a predetermined time. Then, the recording is started again, stopped and waited for a predetermined time, and this operation is repeated until the recording is stopped. In such a time lapse VTR, since an input signal is simply recorded, recording of unnecessary images has been performed endlessly. For this reason, the recording tape was consumed meaninglessly, and the life was significantly reduced due to friction of the head and the running system of the tape. As an example of solving this drawback, there is an intermittent magnetic recording apparatus disclosed in Japanese Patent Application Laid-Open No. 4-24783. This intermittent magnetic recording apparatus compares a captured video signal and a recorded video signal as a recording condition with a storage device that stores and stores the same video signal as that recorded on the recording medium. The comparator and the output signal of the comparator are checked at regular intervals, and only when there is a change, control is performed so that the input video signal is recorded on the magnetic recording medium, and the video in which the change is detected in the video signal Only signals are sequentially recorded on the recording medium. By controlling in this way, it is possible to improve the durability of the VTR and extend the exchange magnetism of the magnetic tape.
[0003]
As another example, Japanese Patent Laid-Open No. 63-59282 discloses an intermittent recording VTR. In this case, a motion detection circuit is provided in the VTR, and when “motion” is detected in the input video signal, the intermittent recording mode is switched to the continuous recording mode. FIG. 4 shows the intermittent recording apparatus disclosed in the above-mentioned Japanese Patent Laid-Open No. Hei 4-247783, which compares the storage device 1 for recording a video signal with the output of the storage device 1 and the video signal input to the recording device. The video signal is stored in the storage device 1 and triggered by a signal obtained by sampling the signal of the comparator 2, the magnetic recording device 3 for recording the input video signal, and the signal of the comparator 2 at a constant interval, and this video signal is recorded. Thus, the control device 4 is configured to instruct the magnetic recording device. In this configuration, the output signal of the comparator 2 is examined at regular intervals, a change is detected, and the intermittent recording operation is started, thereby improving the durability of the VTR and extending the replacement time of the magnetic tape.
[0004]
Here, FIG. 5 shows a timing chart in the conventional example of FIG.
A waveform a is a pulse for sampling the output of the comparator 2 by the control circuit 4, a waveform b is an output signal of the comparator 2, and a waveform c is a pulse for the control circuit 4 to control the video signal recording apparatus. ing. That is, in the apparatus of FIG. 4, the waveform a is triggered by the waveform a to create the waveform c. Therefore, no information is recorded in the section d in which the motion is detected as shown in FIG.
[0005]
In FIG. 4, when a block composed of the storage device 1 and the comparator 2 is considered, this block can be regarded as a motion detection circuit. Therefore, the configuration shown in the intermittent recording VTR disclosed in Japanese Patent Laid-Open No. 63-59282 can be considered substantially the same as the configuration shown in FIG.
[0006]
[Problems to be solved by the invention]
By the way, according to the above-mentioned intermittent magnetic recording apparatus disclosed in Japanese Patent Laid-Open No. Hei 4-247783, since the timing for detecting and recording the change of the video information by the comparator at a fixed interval is determined, the change occurs while the detection result is viewed. If it occurs, it is not recorded. If no “motion” is detected in the video being monitored in the intermittent recording state, new information is not recorded on the magnetic tape, so it cannot be confirmed whether or not it is operating normally. Further, according to the intermittent recording VTR disclosed in Japanese Patent Laid-Open No. 63-59282, if “motion” is detected in the video being monitored from the intermittent recording state, the recording is unconditionally shifted to continuous recording. The amount increases.
[0007]
The present invention has been made in view of the above-mentioned problems, so that the amount of movement of the video signal to be monitored is detected, and the recording mode is set based on the amount of movement to reduce the consumption of the recording tape. Another object of the present invention is to provide an intermittent recording apparatus capable of ensuring necessary recording even if wear of the running system of the head and the tape is reduced to a minimum.
[0008]
[Means for Solving the Problems]
The above problems are solved by the following configuration of the present invention.
An intermittent recording apparatus according to a first aspect of the present invention includes a motion detection circuit that detects a motion of a video signal being monitored, a motion amount detection circuit that detects a motion amount of a motion detected by the motion detection circuit, and the monitor. A video signal recording device for recording the video signal being recorded on the magnetic tape, and a control circuit for controlling the video signal recording device based on information of the motion amount detection circuit, and depending on the magnitude of the output signal of the motion amount detection circuit The video signal recording device changes the recording interval for intermittent recording, and when there is no output in the motion amount detection circuit, recording of the video signal is stopped , and a storage element is installed in the casing in which the magnetic tape is accommodated. provided, when the video signal on a magnetic tape by no motion in the image being monitored is not recorded, information indicating that no motion in the video, said memory element at a predetermined time interval set It has a configuration to be stored in.
[0009]
According to a second aspect of the present invention, in the intermittent recording apparatus according to the first aspect, the timing for changing the time interval for intermittent recording of the video recording apparatus is based on a preset interval or an output signal from the motion detection circuit. It was set as the structure.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram of an intermittent recording apparatus according to an embodiment of the present invention. The intermittent recording device includes a motion detection circuit 5, a motion amount detection circuit 6, a video signal recording device 3, a control circuit 4, and a storage device 1 as main components.
[0011]
The motion detection circuit 5 receives a video signal output from an imaging device such as a surveillance camera and converted into a digital signal. For example, using a memory, the motion detection circuit 5 compares the video signal delayed for a predetermined time with the current video signal. Then, when there is a motion in the image, this is detected. The output signal detected by the motion detection circuit 5 is input to the motion amount detection circuit 6, and the motion amount of the video being monitored is detected. Information on the detected motion amount is input to the control circuit 4 to control the intermittent recording mode of the video signal recording device (VTR).
[0012]
The video signal from the surveillance camera is input to the storage device 1 and is input to the video signal recording device after being delayed for a predetermined time and recorded. The capacity of the storage device 1 only needs to be long enough for the control circuit 4 to make a determination for optimally recording the video signal recording device 3, and is set here for one field or one frame. To do.
[0013]
FIG. 2 shows a timing chart of the intermittent recording apparatus according to the embodiment of the present invention shown in FIG. In FIG. 2, a waveform e indicates an output signal of the motion detection circuit 5, a waveform f indicates an output signal of the motion amount detection circuit 6, and a waveform g indicates a control signal for the control circuit 4 to control the video signal recording device 3. While the waveform g is output from the control circuit 4, the video signal recording device 3 is made to record the video.
[0014]
The signal e detected by the motion detection circuit 5 is expressed as the amount of motion of the video signal monitored by the motion amount detection circuit 6 based on the width and number of the detected signals. If the amplitude of the waveform f is high, an object that moves rapidly is monitored.
The control circuit 4 is. The output f of the motion amount detection circuit 6 is input, and the intermittent recording mode of the video signal recording apparatus 3 is set. Here, an example of setting the intermittent recording mode will be described.
[0015]
For example, when the output waveform f of the motion amount detection circuit 6 has an amplitude h, that is, when the surveillance camera detects the motion of an object but the motion amount is relatively small, the control circuit 4 It is set to output a control signal g for performing intermittent recording at intervals of 4 seconds. When the waveform f indicates an amplitude i that is a high amplitude, the control signal g is output so as to continuously record. When the waveform f has an amplitude as high as j, a control signal g for intermittent recording is output at intervals of 2 seconds. Note that the recording time t 0 for intermittent recording is appropriately set in advance. Also, the timing for changing the time interval for intermittent recording can be set in advance, but by performing it at the timing at which the motion detection circuit detects the motion, the video signal to be recorded can be recorded accurately and accurately. it can.
[0016]
Also, the recording operation is controlled to stop in a section where there is no output from the motion amount detection circuit 6. In this way, the control circuit 4 accurately controls necessary information by controlling the interval of recording by the video signal recording device 3 based on the motion of the object captured by the surveillance camera and the degree of the motion. It is possible to record and not to record extra video.
[0017]
By the way, in the intermittent recording mode as described above, it is necessary to confirm whether or not the intermittent device is operating normally even when the monitored video signal does not move. Therefore, in the present invention, a storage means is further arranged in a housing that accommodates the magnetic tape, and this storage means stores that there is no motion in the video signal being monitored.
[0018]
FIG. 3 shows a block diagram of the video signal recording apparatus 3 in the present invention.
The input video signal is subjected to predetermined signal processing by the signal processing circuit 7. The processed signal is input to the recording amplifier circuit 8, amplified, supplied to the head 9, and recorded on the magnetic tape 10. In the present invention, an information storage circuit 11 including a storage element is provided in a housing 12 that accommodates a magnetic tape. The control device 4 outputs the waveform k shown in FIG. 2 to the information storage circuit 11 when there is no movement in the information storage circuit 11 and the monitored video signal, and there is no movement in the monitored image. Remember that. Here, when the video signal on the magnetic tape 10 is not recorded, so that to store the information at intervals t 1 predetermined in the information storage circuit. In addition, the information memorize | stored in this case is memorize | stored with the time information from a time measuring means (not shown). Further, as the storage capacity of the information storage circuit 11, for example, a storage capacity capable of storing information for 24 hours is provided. As described above, when the video signal is not recorded on the magnetic tape, information indicating that the video signal does not move is stored in the information storage circuit 11 provided separately, so that the video signal is recorded on the magnetic tape. It is possible to confirm that the video signal storage device 3 is operating normally even during a period in which there is no period, and it is easy to grasp a period in which there is no movement in the video signal being monitored.
[0019]
【The invention's effect】
According to the first aspect of the present invention, the video signal is recorded only when the video signal being monitored is moving, and the recording interval is changed depending on the degree of the movement, so that the monitoring is ensured. In addition, the consumption of the magnetic tape to be recorded can be greatly reduced. Therefore, the wear of the running system of the video recording apparatus is minimized, and the durability of the apparatus is improved. Further, the interval for intermittent recording can be arbitrarily set according to the degree of movement of the video signal being monitored, and the optimum condition can be set according to the object to be monitored. Even if the video signal being monitored does not move and is not recorded on the magnetic tape, information indicating that there is no movement is stored in a storage element provided in the housing of the magnetic tape. By confirming later, it becomes possible to confirm that the video signal recording apparatus is operating normally, and it becomes easy to grasp the period during which the monitored video signal does not move.
[0020]
According to the second aspect of the present invention, when a motion is detected in the video signal being monitored, it is possible to immediately shift to a recording operation even within a preset interval, and a larger amount of information can be obtained. And leakage of information to be monitored can be reduced.
[Brief description of the drawings]
FIG. 1 is a block diagram of an intermittent recording apparatus according to an embodiment of the present invention.
FIG. 2 is a timing chart in the embodiment of the present invention.
FIG. 3 is a diagram showing a configuration of a video signal recording / recording apparatus.
FIG. 4 is a block diagram showing an intermittent recording apparatus using a conventional memory circuit.
FIG. 5 is a timing chart in a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Storage device 2 Comparison circuit 3 Video signal recording device 4 Control circuit 5 Motion detection circuit 6 Motion amount detection circuit 7 Signal processing circuit 8 Recording amplification circuit 9 Head 10 Magnetic tape 11 Information storage circuit

Claims (2)

監視している映像信号の動きを検出する動き検出回路と、前記動き検出回路が検出する動きの動き量を検出する動き量検出回路と、前記監視している映像信号を磁気テープに記録する映像信号記録装置と、前記動き量検出回路の情報により前記映像信号記録装置を制御する制御回路とから構成され、前記動き量検出回路の出力信号の大小により前記映像信号記録装置が間欠記録する記録間隔を変化させるようにすると共に前記動き量検出回路に出力がない場合は映像信号の記録を停止し、前記磁気テープが収容される筐体内に記憶素子を設け、監視している映像に動きがないことにより磁気テープに映像信号が記録されない場合、映像に動きがないことを示す情報を、設定した一定の時間間隔で前記記憶素子に記憶させることを特徴とする間欠記録装置。A motion detection circuit for detecting the motion of the video signal being monitored, a motion amount detection circuit for detecting the motion amount of the motion detected by the motion detection circuit, and a video for recording the monitored video signal on a magnetic tape A recording interval comprising a signal recording device and a control circuit for controlling the video signal recording device based on information of the motion amount detection circuit, and the video signal recording device intermittently records depending on the magnitude of the output signal of the motion amount detection circuit When there is no output to the movement amount detection circuit, recording of the video signal is stopped, and a storage element is provided in the casing in which the magnetic tape is accommodated, and there is no movement in the monitored image. during video signal on a magnetic tape may not be recorded, the information indicating that there is no movement in the images and wherein the to be stored in the storage device at a predetermined time interval set by Recording device. 請求項１記載の間欠記録装置において、前記映像記録装置間欠記録する時間間隔を変化させるタイミングは、予め設定された間隔、又は前記動き検出回路からの出力信号に基づき行われることを特徴とする間欠記録装置。  2. The intermittent recording device according to claim 1, wherein the timing for changing the time interval for intermittent recording of the video recording device is performed based on a preset interval or an output signal from the motion detection circuit. Recording device.
JP23737597A 1997-09-02 1997-09-02 Intermittent recording device Expired - Fee Related JP4115558B2 (en)

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