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Compression release

Axis Communications, the network video product company, has a new release of Axis’ Zipstream compression. It now automatically adapts to PTZ camera movements. Storage and bandwidth consumption is reduced even while operators pan, tilt or zoom a camera.

Johan Paulsson, Chief Technology Officer, Axis Communications, says: “Axis’ Zipstream technology has been a huge market success since its introduction a year ago. It has received several industry awards confirming it is a true game changer. The latest release is able to adapt to PTZ camera movements in real-time, offering further storage and bandwidth savings and making bitrate peaks a thing of the past.”

According to the firm, it makes little sense to invest in quality cameras when reducing the video bit rate, resolution or frame rate to a level where details are no longer captured and footage does not provide clear evidence. Most IP-based video surveillance systems are based on the H.264 video compression standard, lowering bandwidth and storage requirements, the product company adds. Compatible with H.264 network infrastructure and video management software, Zipstream is described by Axis as a significantly more efficient H.264 implementation, lowering bandwidth and storage requirements by an average 50pc or more, it is claimed. This is achieved by adding a new module inside the video compression engine of a network camera for important details in the image to get enough attention in the video stream while unnecessary data can be removed.

The makers say that Zipstream analyses and optimises the network camera’s video stream in real-time. Scenes containing interesting details are recorded in full image quality and resolution while other areas are filtered out to best use available bandwidth and storage. Important forensic details like faces, tattoos or license plates are isolated and preserved, while irrelevant areas such as white walls, lawns and vegetation are sacrificed by smoothing to achieve better storage savings.

PTZ camera movements can cause bandwidth peaks resulting in frames being skipped, both in live operator viewing as well as in recordings. Zipstream compression is now able to adapt to these camera movements. Bandwidth peaks can be avoided thanks to a new dynamic rate controller that is automatically enabled when the camera is being panned, tilted or zoomed.


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