High Definition Stream Management – Maximum Scalability and Bandwidth Management - Part 1

課題

As your video surveillance system expands in camera count and image resolution can your video management system keep up?

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High Definition Stream Management –  Maximum Scalability and Bandwidth Management - Part 1


The scenario repeats itself all too often: the hourglass or spinning icon when accessing live or recorded video, waiting for the system to catch up. Slow, choppy and blurry video as it struggles to deliver required resolution and frame rate. These are the familiar symptoms of a video management system (VMS) unable to handle the demands of a growing high definition surveillance architecture.

While improved compression technologies like H.264 have provided bandwidth savings over predecessor standards, the overall performance of your VMS is not determined by compression alone. As you expand the count of high resolution cameras within your system, the strain on network and other computing resources undoubtedly increases.

To address the challenge of system scalability and bandwidth management, Avigilon has developed High Definition Stream Management (HDSM)™ technology. HDSM™ is a proprietary stream management technology that drastically reduces server-client bandwidth requirements and makes optimal use of client computing resources, enabling greater scalability and increased camera resolution.


How it works

While other VMS systems are dependent on leveraging video compression, multicasting and multi-streaming for bandwidth management, Avigilon Control Center software employs HDSM, a purpose-built bandwidth management technology, which reduces overall network load by an order of magnitude more than traditional technologies.

HDSM technology stores the video information on the server as small packets. Simultaneously, HDSM separates the video into multiple useable segments: lower resolution and smaller size streams for situational awareness, and much larger streams for full image detail. HDSM then intelligently manages these streams based on what the user is viewing.

For example, if multiple cameras are being displayed in Avigilon Control Center software with full field of view, the lower resolution stream is sent from the server to the client. When the user engages a camera and digitally zooms in for greater detail, the higher resolution stream is provided. However, only the portion from that region of interest is sent. This dramatically reduces the amount of information exchanged between the server and client, by only providing the information that the user needs at that time, regardless of resolution.



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High Definition Stream Management 2.0

Until now, HDSM technology was most effective with the JPEG2000 compression standard. This was primarily due to the dynamic adaptability of the JPEG2000 compression standard with high-resolution imaging. While JPEG2000 provides coding flexibility and high imaging performance, it also produces higher average bitrate streams and less overall compression than H.264, and is not a widely used standard within the video security surveillance industry.

As a result, HDSM 2.0 technology was developed to operate with the H.264 compression standard, simultaneously providing users with high-resolution imaging performance, further bitrate reduction of H.264 and the intelligence and flexibility of HDSM. This technology pairing provides a unique and superior network performance over systems solely utilizing H.264 compression. The next section outlines how this works:


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In figure 1A HDSM technology is illustrated with the white line grid over a 16 MP image. The image is divided into 12 distinct areas. When a user zooms in an area for more detail, only that portion, in this illustration 1/12th of the total resolution, is sent from the server to the client. Not only does this drastically reduce the bandwidth between server and client, it reduces the required decoding resources, which enables improved system performance, responsiveness and overall user experience.

HDSM technology also uses progressively lower resolutions. For example, if you were to display the full field of view of a 16 MP camera on your 1080p (2MP) monitor, you would receive an intermediate resolution since you only need 2 MP of data. And when a camera is being viewed within a multiple camera display (e.g. one of 9 cameras in a 3 x 3 grid), the lowest resolution is used. In the end, HDSM technology provides only the resolution and detail you need when you need it.


Conclusion

For system integrators and end users planning for their video surveillance system expansion, Avigilon Control Center software with HDSM technology is a solution that will provide them both increased performance and flexibility. With HDSM 2.0 technology, Avigilon has paired H.264 compression with intelligent bandwidth management technology to create an effective solution in enabling broad system scalability in both camera count and resolution.

Read Part 2 - The Technical Details



用語

ACC バージョン カメラでテストした ACC の最新バージョン。これ以降の ACC バージョンについても、特に明記されない限りはサポートされます。
音声入力 カメラから音声フィードを受信します。
音声出力 カメラに接続されたスピーカーに音声を送信します。
オートディスカバリー LAN 環境で接続したときにカメラの IP アドレスを自動的に見つけます。
圧縮のタイプ カメラで利用できるエンコーディングの種類。
接続タイプ 使用するデバイス ドライバーの種類。個々のデバイスは、そのデバイス メーカーのデバイス ドライバーによって制御されます。
歪み補正 フィッシュアイカメラまたはパノラマカメラの歪みをクライアント側で補正します。
デジタル入力 カメラからデジタル入力またはリレー入力を受信します。
デジタル出力 カメラに物理的に接続されたデジタル出力またはリレー出力をトリガーします。
モーション 当該カメラでモーション レコーディングが利用できるかどうかを示すクイック ディスプレイ。
モーション設定 ACC Client におけるモーション検知の設定。
モーション レコーディング 動きが感知されたときだけ記録します。
PTZ 当該カメラで PTZ 機能が利用できるかどうかを示すクイック ディスプレイ。
PTZ コントロール PTZ の基本的な動き。
PTZ パターン/ツアー カメラのサポート状況に応じて PTZ パターンと PTZ ツアーのいずれかを作成してトリガーする機能。
PTZ プリセット PTZ プリセット ポジションを作成してトリガーします。
ユニット タイプ カメラの種類。
検査者 カメラの試験と機能の報告とを行った組織。
検証済みファームウェア 試験した個々のファームウェアのバージョン。
メーカー Blah
モデル DS-2DE2103
接続タイプ ONVIF
ユニット タイプ IP PTZ カメラ
圧縮のタイプ H.264

  • ACC バージョン
  • モデル DS-2DE2103
  • 接続タイプ ONVIF
  • メーカー Blah
  • メーカー Blah
  • メーカー Blah
  • メーカー Blah
  • メーカー Blah
  • メーカー Blah
  • メーカー Blah
  • メーカー Blah
  • メーカー Blah