CCTV

HDCVI goes 4K

by Mark Rowe

The Chinese video surveillance product company, Dahua Technology, reports that it’s bringing HDCVI into the 4K era. Dahua 4K-HDCVI adopts 4K Ultra HD image acquisition and back-end DVR storage. The coaxial-based HDCVI standard according to the company overcame the common bottleneck of transmission bandwidth to achieve high resolution video previously only available the firm says on IPC.

Dahua’s 4K HDCVI offering includes a 4K box camera (DH-HAC-HF3805G), 4K infra-red bullet camera (DH-HAC-HFW3802E-Z) and dome (DH-HAC-HDBW3802E-Z), 4K fish-eye panoramic camera (DH-HAC-EBW3802), 4K multi-sensor 180 degree panoramic camera (DH-HAC-PFW3601-A180), and a series of 4K-supported XVR (HCVR7000-4K Series) recorders. By deploying a signal modulation mechanism and noise reduction technique, Dahua 4K Ultra HD solution transmits 4K video signal up to 700m (RG6 cable), the makers say.

The DH-HAC-HF3805G, adopts the SONY 4/3-inch 8MP STARVIS sensor, and outputs 3840(H) x 2160(V) high resolution images, equivalent to the performance of 4X 1080 HD camera, to achieve wide angle coverage and video evidence at the same time. This camera offers autofocus, image magnification for dynamic detection and a linkage alarm without the need to use with the back-end. With a suitable housing, this camera is the makers say for outdoor surveillance, including it is claimed in difficult lighting.

The DH-HAC-PFW3601-A180 makes use of Dahua’s image stitch algorithm to perform 180 degrees panoramic stitching. According to the manufacturer, it is the first HDCVI multi-lens infrared camera with a 4K 180 degree panoramic view. By using three SONY STARVIS sensors and F1.4 large aperture lens, this infrared camera delivers quality images even under low light, it is claimed. Working with the 4K backend, panoramic images can offer auto-tracking to show a multiple target split-screen view using the magnifying tracking. Electronic cruise, also known as E-PTZ, is also supported. This panoramic camera will benefit the detection of moving targets in critical areas. The camera has IP67 and IK10 protection, making it a choice for entrances and exits, transport junctions, and parks.

And the fisheye camera can recognise a person’s face up to 10m away, according to the firm. De-warping is accomplished in either the back-end HCVR70000-4K or mobile client app. It supports various modes of multi-image de-warping views.

The HCVR7000-4K Series, 4K HDCVI Decoder, deploys H. 264+ compression to save up to 70 per cent storage space according to the makers. It supports 4K at 15fps (frames per second) encoding and delivers HDMI 4K high resolution output.

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