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Logi-Zoom

Logi-Zoom

HIGH RESOLUTION CAMERAS CREATE BANDWIDTH ISSUES

As camera resolution increases in the security industry, so does the network bandwidth requirement. A contemporary video surveillance system should be fully manageable remotely, and all the advantages of multi-megapixel cameras should be utilized real-time in the remote monitoring room. Common analog CCTV systems can work normally with standard bandwidths. On the other hand, multi-megapixel video surveillance systems require much greater bandwidth, which gives rise to certain issues. Increasing the bandwidth exponentially is unacceptable, since it would raise system costs to unrealistic heights. In a multi-megapixel surveillance system, it is therefore important to produce only an acceptable amount of network traffic.

ANALOG VIDEO MONITORING SYSTEMS

In case of analog video monitoring systems, the resolution of the image displayed in the video management software is usually the same as that of the camera (25 KB/image). Therefore digital zooming does not provide further details or visual information, and results only in significant pixelization in the image.

COMMON MULTI-MEGAPIXEL VIDEO MONITORING SYSTEMS

In multi-megapixel video surveillance systems, the real size of the images produced by the cameras is much higher than the monitor resolution. One can obtain additional information and detail by digitally zooming the image. In order to achieve this, the system must transmit the multi-megapixel pictures in full size to the monitoring site (approximately 500 KB per image or more). To transmit this much data, a very wide bandwidth network is required.

LOGIPIX MULTI-MEGAPIXEL VIDEO MONITORING SYSTEM

In general, if only a limited bandwidth network is available, the transmission of multi-megapixel images can be performed only at a very low frame rate or not at all. Fortunately, LOGIPIX solved this problem when our engineers developed Logi-Zoom, a hardware-driven zoom function. This extremely cost-effective solution efficiently utilizes the scalability of the JPEG2000 compression standard. It allows the sending of only the currently required, zoomed picture area in high resolution (approximately 25 KB per image section), while the rest of the image is sent in a lower, screen-optimized resolution (25 KB per full image). This function can be used both in live and archive modes.

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