ACTi NVR 3 Corporate - Manual (Page 73)

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NVR 3 Corporate System Administrator ’s Manual
73
Configure Fisheye Cameras
With hemispherical lenses, fisheye cameras generate images at up to 360-degree width,
which can cover all four corners of a room or both sides of a long aisle. As the original image
captured by wide-angle lens is much distorted, to suit most monitoring purposes, the
Dewarping process is required to alter the uneven lines and shapes before the images are
displayed. Nowadays, the fisheye cameras come in two types in terms of the
image-correction capability:
 Fisheye Cameras with in-camera dewarping function
The video is dewarped in camera before it is output to NVR server. Since the image
correction is handled by the camera itself, NVR server will not bear much extra loading,
which benefits the system requiring many fisheye cameras (e.g. ACTi KCM-3911,
KCM-7911)
 Fisheye Cameras without dewarping function
These fisheye cameras output only original global images, which rely on software algorithm
provided by NVR sever to correct the images. They are suitable for a system with limited
bandwidth, for NVR server processes and responds to User’s ePTZ manipulation or
demands for changing view modes without waiting for camera side to constantly deliver
updated frames (e.g. ACTi E96).
NVR 3 makes it possible to integrate both kinds of fisheye cameras into your system with the
following advantages:
 Full support for all types of dewarped video stream output from fisheye cameras with
in-camera dewarping capability.
 NVR’s software algorithm can perfectly corrects the original fisheye images, generating 6
specific fisheye view modes which suit human eye’s accustomed perspective.
 Based on user’s instant request for changing view mode or PTZ view point, NVR server
processes the original fisheye image and responds to the clients individually. In this way,
what one client sees on Live View will not affect playback, recording, as well as another
concurrent client’s connection.
 The virtualized ePTZ manipulation also allows User to dynamically explore any region of
interest within the hemispheric view like operating a genuine PTZ device .
To make use of NVR’s dewarping features for your fisheye cameras, please
1. Adjust Video Quality Settings
After the fisheye camera is successfully added, go to Setup page Devices tab, select the
device and then Video tab, make sure you set the Stream Mode as “ FISHEYE ” for a
hemispheric camera ( KCM-3911, KCM-7911) .This is to make sure this hemispheric camera is
outputting fisheye original video stream as a mini fisheye dome camera does.