The security industry has evolved into a high-definition trend, and I believe many of us have used HD network cameras. But what are the real advantages? First, ultra-clear image quality that's almost perfect; second, easy installation with simplified wiring. However, there is one downside: a slight delay. Before people used HD camcorders, they often waved their hands in front of the camera to check if the video was smooth and had no lag.
Delay is one of the key performance indicators for HD network cameras. To address this issue, it's essential to understand how the delay occurs. Here are several major factors that contribute to latency:
1. The time it takes for the HD Network Camera (HDNC) to capture and encode the video signal.
2. Network transmission delays caused by bandwidth limitations or suboptimal network devices.
3. Decoding time on the backend device after receiving the encoded video stream.
Some users might not care about a small delay, but in critical situations, even a few seconds can make a big difference. A delay could lead to missed opportunities in preventing incidents, which defeats the purpose of surveillance.
With technological advancements over the past few years, HD camera delays have significantly improved compared to two years ago. However, if the backend system lacks a proper decoder, or if the preview device isn't powerful enough, decoding and preview delays may still occur.
It's important to note that some level of delay is inevitable in webcam systems. But achieving zero delay is still a long way off. Currently, a delay of around 0.5 seconds is generally acceptable. Solving the delay issue completely will require overcoming significant technical challenges, and breakthroughs may take several more years of development.
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