JP2001145091A - Image transmission system - Google Patents
Image transmission systemInfo
- Publication number
- JP2001145091A JP2001145091A JP32608599A JP32608599A JP2001145091A JP 2001145091 A JP2001145091 A JP 2001145091A JP 32608599 A JP32608599 A JP 32608599A JP 32608599 A JP32608599 A JP 32608599A JP 2001145091 A JP2001145091 A JP 2001145091A
- Authority
- JP
- Japan
- Prior art keywords
- image
- transmission
- monitoring
- background
- background image
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Closed-Circuit Television Systems (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
- Maintenance And Management Of Digital Transmission (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は画像データ伝送シス
テムにおける画像伝送方式に関する。[0001] 1. Field of the Invention [0002] The present invention relates to an image transmission system in an image data transmission system.
【０００２】[0002]
【従来の技術】これまで遠隔画像監視を行う場合、ＩＳ
ＤＮの公衆網や専用線などでディジタル画像伝送を行う
ことが多い。これら伝送路の帯域は大きいものではな
く、高能率符号化を行っても画像の動きの滑らかさや伝
送チャネルの数に制限が出てくる。2. Description of the Related Art Conventionally, when remote image monitoring is performed, IS
Digital image transmission is often performed over a public network of a DN or a dedicated line. The bandwidths of these transmission paths are not large, and even if high-efficiency coding is performed, the smoothness of image motion and the number of transmission channels are limited.
【０００３】[0003]
【発明が解決しようとする課題】本発明はこのような問
題点を解決し、狭帯域伝送路での監視画像の画質の向上
を図ることを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to solve such a problem and to improve the quality of a monitor image on a narrow band transmission line.
【０００４】[0004]
【課題を解決するための手段】画像監視において、撮像
した画像すべてを必要としない場合がある。たとえば、
固定カメラによる高速道路の監視などである。図１は監
視カメラの撮像範囲を示すが、その範囲すべてを監視し
たいとは限らない。また、監視エリア外の画像は樹木な
どの高周波の信号成分を含む場合が多く符号化効率を落
としてしまう。そのため、伝送帯域の占有を大きくして
しまう。そこで、本発明は監視対象の映像を含む監視エ
リア画像と背景エリア画像を分離しそれぞれ記憶し、分
離した画像の監視対象としての必要性に応じて時間的お
よび空間的重み付けを行い重要度の高い画像の伝送レー
ト高くし伝送し伝送効率を向上するようにしたものであ
る。つまり、本発明はカメラが撮像した画像を監視が必
要なエリアと不要なエリアにわけ、例えば、監視が必要
な監視エリアＡと監視が不必要な監視エリア外Ｂとに分
離し、必要な部分の信号のみを伝送するか監視エリアＢ
の伝送レートをＡに比べ極端に低くしたものである。SUMMARY OF THE INVENTION In image monitoring, it may not be necessary to use all of the captured images. For example,
For example, monitoring of expressways with fixed cameras. FIG. 1 shows the imaging range of the monitoring camera, but it is not always necessary to monitor the entire range. Further, the image outside the monitoring area often includes high-frequency signal components such as trees, which lowers the coding efficiency. Therefore, the occupation of the transmission band is increased. Therefore, the present invention separates and stores the monitoring area image and the background area image including the video of the monitoring target, and performs temporal and spatial weighting according to the necessity of the separated image as the monitoring target, so that the importance is high. The transmission rate of the image is increased to improve the transmission efficiency. That is, the present invention divides the image captured by the camera into an area requiring monitoring and an area not requiring monitoring. For example, the image is separated into a monitoring area A requiring monitoring and an area B outside monitoring area not requiring monitoring. Or monitoring area B
Is extremely lower than that of A.
【０００５】[0005]
【発明の実施の形態】本発明の実施例の構成を図２に示
す。同図において、１はデータ伝送部、１１は監視エリ
ア指定部、１２は画像取込部、１３は画像分離部、１４
は監視画像用メモリ、１５は背景画像用メモリ、１６は
背景画像比較回路、１７は背景画像用メモリ２であり、
２はデータ受信部、２１は監視画像用メモリ、２２はデ
ータチェック回路、２４は背景画像用メモリ１、２５は
信号合成器、３はテレビカメラ、４は伝送路、５はモニ
タである。ａは監視画像、ｂは背景画像、ｃはモニタ表
示画像、ｄはカメラ出力画像を示す。撮像したカメラ画
像は監視エリア画像と監視エリア外画像に分離する。監
視エリアＡと監視エリア外Ｂを分離するためには、背景
画像と監視画像を区別する必要がある。監視場所が複数
ある場合には、監視その場所に応じてそれぞれ設定す
る。設定された指定エリア情報をもとに監視外エリアＢ
（図１参照）の画像は背景画像用フレームメモリ１５、
監視エリアＡ（図１参照）の画像は監視画像用フレーム
メモリ１４に分離入力する。分離方法は、監視場所の代
表的な図１に示す画像を取込む。取込まれた画像をもと
に監視エリアＡと冗長成分（非監視エリアＢ）の境界線
Ｓを画素単位で指定する。例えば、垂直Ｙ方向の画素を
ｙ１、水平Ｘ方向の画素ｘ１とすると、（Ｘ，Ｙ）＝
（ｘ１，ｙ１）となり境界線Ｓは画素の集まりとなりＦ
（ｘ，ｙ）で表現できる（図１参照）。境界線Ｓは、取
込んだ代表画像内でクローズされるものとなり、境界線
内部の画像が監視画像用フレームメモリ１４に入力され
る。また、境界線Ｓでクローズされない画像は背景画像
用フレームメモリ１５に入力される。 通常の伝送で
は、監視画像用フレームメモリ１４に入力された画像デ
ータのみが伝送され、背景用画像用フレームメモリ１５
に入力された画像データは必要に応じて伝送する。ここ
で、背景画像の伝送を頻繁に行うと伝送効率が低下して
しまうため、その伝送タイミングには注意する必要があ
る。背景画像の伝送タイミングは、日照変化などを考慮
し時間的変化での伝送や、侵入者などを考慮し過去の背
景画像と現在の背景画像の差分が大きくなった場合で伝
送する方法などが考えられる。時間的変化での伝送で
は、朝、日中、夜などの変化や天候の変化などを考え数
十分毎に背景画像を伝送したり、場合によっては数時間
毎の伝送なども考えられる。背景画像の差分では、背景
画像としている背景画像用メモリ１５内の過去の画像と
背景画像用メモリ１５内の現在の画像を画素単位で比較
する。たとえば、背景画像の画素（ｘ，ｙ）で過去の画
像の値と現在の画像の値を比較する。すべての画素で値
の一致がとれない場合や半分の画素で一致がとれない場
合などに背景画像の伝送を行う。背景画像用メモリ１５
内のデータは更新される背景画像、すなわち受信部２で
参照する背景画像データと記憶しておく。データの伝送
は監視画像データ群もしくは背景画像データ群の単位で
伝送を行う。それぞれのデータ群には、データの先頭を
示す情報と背景画像データと監視画像データとを区別す
る情報を付け伝送する。データ受信部２では、データ群
の先頭を見つけ背景画像データであれば背景画像用メモ
リ２４に、監視画像データであれば監視画像用メモリ２
１に入力する。受信側からの映像信号は監視画像および
背景画像を重畳した信号として出力する。このとき、監
視画像は常時更新されるが、背景画像では更新されるま
で同じデータを参照することとなる。そのイメージを図
３に示す。５ｃはモニタ表示画像、ａは監視エリア画
像、ｂは背景画像である。FIG. 2 shows the configuration of an embodiment of the present invention. In the figure, 1 is a data transmission unit, 11 is a monitoring area designation unit, 12 is an image capture unit, 13 is an image separation unit, 14
Is a monitor image memory, 15 is a background image memory, 16 is a background image comparison circuit, 17 is a background image memory 2,
2 is a data receiving unit, 21 is a monitor image memory, 22 is a data check circuit, 24 is a background image memory 1, 25 is a signal synthesizer, 3 is a television camera, 4 is a transmission path, and 5 is a monitor. a indicates a monitoring image, b indicates a background image, c indicates a monitor display image, and d indicates a camera output image. The captured camera image is separated into a monitoring area image and an image outside the monitoring area. In order to separate the monitoring area A from the outside of the monitoring area B, it is necessary to distinguish the background image from the monitoring image. When there are a plurality of monitoring locations, the monitoring locations are set according to the monitoring locations. Non-monitoring area B based on the specified designated area information
The image shown in FIG. 1 is a frame memory 15 for a background image,
The image of the monitoring area A (see FIG. 1) is separately input to the monitoring image frame memory 14. The separation method captures the image shown in FIG. 1 of a representative monitoring location. A boundary line S between the monitoring area A and the redundant component (non-monitoring area B) is specified on a pixel basis based on the captured image. For example, assuming that the pixel in the vertical Y direction is y1 and the pixel x1 in the horizontal X direction, (X, Y) =
(X1, y1) and the boundary line S becomes a group of pixels and F
(X, y) (see FIG. 1). The boundary line S is closed in the captured representative image, and the image inside the boundary line is input to the monitoring image frame memory 14. An image that is not closed by the boundary line S is input to the background image frame memory 15. In normal transmission, only the image data input to the monitoring image frame memory 14 is transmitted, and the background image frame memory 15
The image data input to is transmitted as necessary. Here, if the background image is transmitted frequently, the transmission efficiency is reduced, so that it is necessary to pay attention to the transmission timing. The transmission timing of the background image can be considered as a method of transmission with a temporal change in consideration of sunshine change or a method of transmitting when the difference between the past background image and the current background image becomes large considering intruders etc. Can be In the transmission based on a temporal change, a background image may be transmitted every tens of minutes in consideration of a change in the morning, daytime, night, or the weather, or may be transmitted every several hours in some cases. In the background image difference, a past image in the background image memory 15 as a background image is compared with a current image in the background image memory 15 in pixel units. For example, the value of the past image is compared with the value of the current image at the pixel (x, y) of the background image. The background image is transmitted when the values of all the pixels cannot be matched or when the values of half the pixels cannot be matched. Background image memory 15
Are stored as background images to be updated, that is, background image data to be referred to by the receiving unit 2. Data transmission is performed in units of a monitoring image data group or a background image data group. Each data group is transmitted with information indicating the head of the data and information for distinguishing the background image data from the monitoring image data. The data receiving unit 2 finds the head of the data group and stores it in the background image memory 24 if it is background image data,
Enter 1 The video signal from the receiving side is output as a signal in which the monitoring image and the background image are superimposed. At this time, the monitoring image is constantly updated, but the background image refers to the same data until it is updated. The image is shown in FIG. 5c is a monitor display image, a is a monitoring area image, and b is a background image.
【０００６】[0006]
【発明の効果】監視画像、背景画像を分離することで符
号化能率の向上が予測される。そのため、監視画像部の
動きや多重化できる伝送チャネルの向上が期待される。The coding efficiency is expected to be improved by separating the monitoring image and the background image. Therefore, it is expected that the movement of the monitoring image section and the transmission channels that can be multiplexed are improved.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明におけるカメラ画像における監視エリア
説明図。FIG. 1 is an explanatory diagram of a monitoring area in a camera image according to the present invention.
【図２】本発明の実施例のシステムブロック図。FIG. 2 is a system block diagram of an embodiment of the present invention.
【図３】本発明の実施例の表示イメージ説明図。FIG. 3 is an explanatory diagram of a display image according to the embodiment of the present invention.
１：データ伝送部、１１：監視エリア指定部、１２：画
像取込部、１３：画像分離部、１４：監視画像用メモ
リ、１５：背景画像用メモリ、１６：背景画像比較回
路、１７：背景画像用メモリ、２：データ受信部、２
１：監視画像用メモリ、２２：データチェック回路、２
４：背景画像用メモリ、２５：信号合成器、３：テレビ
カメラ、４：伝送路、５：モニタ、ａ：監視画像、ｂ：
背景画像、ｃ：モニタ表示画像、ｄ：カメラ出力画像。1: data transmission unit, 11: monitoring area designating unit, 12: image capturing unit, 13: image separation unit, 14: monitoring image memory, 15: background image memory, 16: background image comparison circuit, 17: background Image memory 2: Data receiving unit 2,
1: surveillance image memory, 22: data check circuit, 2
4: background image memory, 25: signal synthesizer, 3: television camera, 4: transmission line, 5: monitor, a: surveillance image, b:
Background image, c: monitor display image, d: camera output image.
Claims (3)
を分離しそれぞれ記憶し、該記憶した画像の内、監視シ
ステムに必要な前記監視エリアの画像のみを伝送するこ
とを特徴とする画像伝送方式。In an image transmission monitoring system, a monitoring area image including a monitoring target image and a background area image are separated and stored, and only the monitoring area image necessary for the monitoring system is stored in the stored images. An image transmission method characterized by transmission.
を分離しそれぞれ記憶し、分離した画像の監視対象とし
ての必要性に応じて時間的および空間的重み付けを行い
重要度の高い画像の伝送レート高くし伝送し伝送効率を
向上することを特徴とする画像伝送方式。2. In an image transmission monitoring system, a monitoring area image and a background area image including a video to be monitored are separated and stored, and temporal and spatial weighting is performed according to the necessity of the separated image as a monitoring target. An image transmission system characterized in that the transmission rate of an image with high importance is increased and the transmission rate is increased to improve the transmission efficiency.
ステムにおいて、分離伝送されてきた監視画像と背景画
像を合成することを特徴とする画像伝送方式。3. The image transmission system according to claim 2, wherein the monitoring image and the background image, which are separately transmitted, are combined.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32608599A JP2001145091A (en) | 1999-11-16 | 1999-11-16 | Image transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32608599A JP2001145091A (en) | 1999-11-16 | 1999-11-16 | Image transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001145091A true JP2001145091A (en) | 2001-05-25 |
Family
ID=18183947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32608599A Pending JP2001145091A (en) | 1999-11-16 | 1999-11-16 | Image transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001145091A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2408878A (en) * | 2003-12-03 | 2005-06-08 | Safehouse Internat Inc | Recording a sequence of images |
| US7664292B2 (en) | 2003-12-03 | 2010-02-16 | Safehouse International, Inc. | Monitoring an output from a camera |
| KR101280443B1 (en) * | 2007-01-23 | 2013-06-28 | 삼성테크윈 주식회사 | apparatus of processing regional image and method thereof |
| US8948245B2 (en) | 2003-12-03 | 2015-02-03 | Lighthaus Logic Inc. | Displaying graphical output representing the activity of a plurality of monitoring detection devices |
| US8953674B2 (en) | 2003-12-03 | 2015-02-10 | Lighthaus Logic Inc. | Recording a sequence of images using two recording procedures |
| WO2020039688A1 (en) * | 2018-08-24 | 2020-02-27 | パナソニックＩｐマネジメント株式会社 | Encoder device and encoding method |
| JP2021022910A (en) * | 2019-07-30 | 2021-02-18 | 株式会社リコー | Communication terminal, communication program, communication method, and communication system |
-
1999
- 1999-11-16 JP JP32608599A patent/JP2001145091A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2408878A (en) * | 2003-12-03 | 2005-06-08 | Safehouse Internat Inc | Recording a sequence of images |
| GB2408878B (en) * | 2003-12-03 | 2009-08-12 | Safehouse Internat Inc | Recording a sequence of images |
| US7664292B2 (en) | 2003-12-03 | 2010-02-16 | Safehouse International, Inc. | Monitoring an output from a camera |
| US8948245B2 (en) | 2003-12-03 | 2015-02-03 | Lighthaus Logic Inc. | Displaying graphical output representing the activity of a plurality of monitoring detection devices |
| US8953674B2 (en) | 2003-12-03 | 2015-02-10 | Lighthaus Logic Inc. | Recording a sequence of images using two recording procedures |
| KR101280443B1 (en) * | 2007-01-23 | 2013-06-28 | 삼성테크윈 주식회사 | apparatus of processing regional image and method thereof |
| WO2020039688A1 (en) * | 2018-08-24 | 2020-02-27 | パナソニックＩｐマネジメント株式会社 | Encoder device and encoding method |
| JP2021022910A (en) * | 2019-07-30 | 2021-02-18 | 株式会社リコー | Communication terminal, communication program, communication method, and communication system |
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