IP Cameras: what's ROI encoding technology

HD IPCs dramatically improve the image quality, but they also bring about some bandwidth and storage issues. To resolve these issues and promote the application of HD video surveillance, Hisilicon has launched the Region of Interest (ROI) encoding solution embedded in its IPCs. This solution is developed based on the fact that a user often focuses on a particular area in the image when watching video, so the particular area in the image has to be very clear, whereas other parts can be less clear. The ROI encoding technology ensures effective surveillance over an area even when the bandwidth is insufficient.

On the monitoring image, users can select one or more ROI areas and specify unique image quality values for these areas respectively. The near-lossless compression (high code stream) technique is used for the ROI area, while the loss compression (low code stream) is used for the background or non-ROI area. This approach provides higher image quality and higher compression ratio, and resolves the problems of insufficient bandwidth and storage space.

Reference: http://www.unifore.net/ip-video-surveillance/briefly-introducing-roi-region-of-interest-video-surveillance.html

What's self-adaptive bandwidth technology?

The network condition for video transmission fluctuates constantly within a certain range. When other network application loads are low, bandwidth available for video stream transmission increases, and vice versa. Considering the phenomenon, a camera using a fixed bit rate cannot well adapt to the changes of the network bandwidth. The bit stream may exceed the maximum bandwidth and cause network congestion, or images are not encoded in a high-quality way to use the available bandwidth maximally and wastes the network resources.

By using the self-adaptive bandwidth technology, Hisilicon network cameras can automatically adjust the video bit rate to flexibly adapt to the changes of network bandwidth. This technology helps to achieve the best image quality and the most efficient video transmission.

Reference: http://www.unifore.net/ip-video-surveillance/ip-camera-main-stream-and-sub-stream.html

What's bit rate stream smoothing technology?

In a surveillance scenario, when objects in photographic field change greatly or image scenes change dramatically due to PTZ rotation, data packets of key frames (I-frames) encoded in the H.264 format increase largely in size and exceed the maximum load of the network bandwidth, which may cause network congestion and packet loss. Depending on the bit rate stream smoothing technology, Hisilicon network cameras can send peak video streams evenly during frame interval according to user configuration, avoiding packet loss caused by instantaneous data increase and ensuring the stability and reliability of video stream transmission.

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