Securing remote locations for safety of staff or protection of corporate assets can be accomplished via satellite communications and video surveillance technology.
Network Innovations BGAN & VSAT technologies provide broadband Internet connectivity for both ‘store and forward’ and live video streaming for surveillance operations.
Video encoders form a key part of the surveillance solution to optimize and compress video for transmission over satellite links.
A typical video surveillance solution over satellite is made up of a camera connected to a video encoder and either a BGAN or VSAT terminal via Ethernet or WiFi, normally in an unmanned or semi-manned location. The camera sends a JPEG image or motion video clip to a specified location when it detects a motion. This type of solution is designed for security agencies, government sites, remote offices, warehouses and pipeline monitoring. Typically, this solution only uses uplink from the terminal to send images. Downlink can only be used to access the camera from fixed office to view live video stream. Remote surveillance solutions usually require a standard IP data connection to transmit still images. There are many IP camera solutions available on the market, and they offer a choice of image transfer method, including email or FTP back to HQ. These IP cameras also support live streaming option, where a user at HQ can login via web browser and access a live video stream.
JPEG Compression – JPEG compression is typically used in IP cameras when transferring still images back to HQ. JPEG compression is a lossy compression, which means you lose some quality from original picture quality. However, lossy compression reduces the size of the data stream by discarding some data during the encoding process before it is sent over the BGAN or VSAT network. Lossy compression offers data savings of around 10:1. For example, a typical 6MP camera might produce a RAW uncompressed file between 5-10MB depending on the complexity of the content. The same image taken as a JPEG file could typically be around 1MB or sometimes less.
MPEG Compression – MPEG compression is typically used in IP cameras for live streaming. The MPEG range has different options: MPEG 1, MPEG 2 and MPEG 4. MPEG 1 and 2 are video-only formats. MPEG 4 is mainly targeted at low bandwidth, with scalable resolution. MPEG compression uses encoding motion vectors, so that only the portions of the picture that move are encoded. Pixels are grouped into blocks, and only the blocks that change between frames are re-encoded and sent across. This uses fewer bits, resulting in significant compression.
TVI Video Encoders – TVI from Digital Barriers is a leading platform for surveillance distribution over limited or variable bandwidth networks. It combines a uniquely efficient video codec and active communications channel manager to deliver low latency, highly resilient and secure visual intelligence almost anywhere. Options are available for a wide variety of camera types with optional DVR capabilities.
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