HD Video Surveillance
Communications, Siqura, Samsung and Vicon. All of the IP-enabled cameras deliver a resolution of HD720p, and all had been tested previously by Benchmark, receiving Recommended status. The HD-SDI equipment was from Everfocus, and had also been previously tested. It too received Recommended status.
As such, all of the equipment had
previously been tested and had been found to be amongst the top performing options delivering HD720p video. However, would end users have a preference between the two technologies?
The end users felt that detail levels and image quality were, overall, pretty much the same. Both options delivered the type of resolution expected, and in decent lighting
both internal and external footage was what would be expected from a HD system. The main differences were due to cameras and set-up options rather than whether HD-SDI or IP was being utilised. The transport system had no real effect/
Colour fidelity was also good - variances on models aside - and again there wasn’t any real obvious difference that could be attributed to the link in use.
The Benchmark test team tried to identify image elements that showed performance based variances; the end users were less intent on finding differences, because they could not see any! To them, the images were HD and that was what they wanted. The only area where it could be said that a
difference due to the infrastructure was noticeable was with regard to latency. The HD-SDI set-up had no real obvious latency, whilst the best achieved with the IP options was just under one half second, ranging to around three quarters of a second. Latency is more of an issue with regard to telemetry control; a point accepted by our end users! Still images and slow motion images didn’t
show significant difference either. Much of the variance can be attributed to compression. As mentioned earlier, much has been made by some of the fact that HD-SDI does not compress images for transmission. Of course, they are still compressed for recording and management! The final area of consideration was low light performance, and again the feeling was that the variances were more due to the performance of individual devices than how the images are transported! Low light performance is more affected by the chipset used, and as the HD-SDI cameras use 1/2.5 inch CMOS sensors, which are similar to many of the IP-enabled cameras, the fact that there were no obvious variances is of little surprise.
What is a slight surprise is that given the
vociferous hype and debate emanating from both sides of the divide, performance doesn’t really differ between the two options. It all comes down to how far an end user wants to go relating to infrastructure changes!
Beyond streaming
IP-based networks have a wide variety of benefits, not least that they are more than capable of delivering true HD video. Add to this the flexibility to expand and develop the
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