Milestone Smart Client 3.6 - Manual (Page 82)

Milestone XProtect Smart Client 3.6; User’s Manual
PTZ Cannot Be Used Retroactively
Despite the fact that the Browse tab features a section named PTZ Control, you cannot use the
section to control PTZ (Pan/Tilt/Zoom) cameras.
This is due to the simple fact that the Browse tab is used for viewing already recorded video; you
cannot control a PTZ camera retroactively.
Instead, the Browse tab's PTZ Control section is used for two purposes:
• For using digital zoom on recorded video (see the following)
• For navigating fisheye 360° images (see page 84)
Digital Zoom
Just like on the Live tab, the Browse tab's PTZ Control section lets you use digital zoom on video
from cameras displayed in a view. When viewing recorded video on the Browse tab, digital zoom is
by default enabled, and you can use it for both regular cameras and PTZ (Pan/Tilt/Zoom) cameras.
If you have used digital zoom while viewing live video on the Live tab it will not have affected any
recording; recording still takes place in the camera's regular format.
What is the difference between optical and digital zoom? With optical zoom, a camera's
lens elements physically move to provide the required angle of view. You cannot use optical zoom
when viewing recorded video, simply because you cannot move the camera's lens retroactively.
With digital zoom, the required portion of an image is enlarged by cropping the image and then
resizing it back to the pixel size of the original image—a process called interpolation. Digital zoom
thus simulates optical zoom, but the digitally zoomed portion will have a lower quality than the
original image. Digital zoom works equally well on live and recorded video.
Digital Zoom Features
With digital zoom you will see a small overview frame in the bottom right corner of each of the
view’s camera positions.
Once you zoom in on an area of an image, the overview frame will help you maintain an overview
of the complete image.
Overview frame inside image
To zoom in, click inside the required image and drag around the area you want to zoom in on. The
area you select will be highlighted by a white border. When you release the mouse button, the
zoom will take effect:
www.milestonesys.com Page 82 Viewing Recorded Video