CCTV system design. Part 1/5: Camera installation height, lens focal lenght and pixel density

CCTV system design. Part 1/5: Camera installation height, lens focal lenght and pixel density


Welcome. From this video tutorial you will learn
how to design CCTV systems with IP Video System Design Tool. By the end of this video tutorial you will be
familiar with features of the program and will learn how to use the IP Video System
Design Tool for planning and designing efficient video
surveillance systems. Let’s begin. On the first tab, called ‘Camera Installation
Drawing’ we can see a camera elevation view and a view from the top You can change the camera installation height
distance from the camera to the target and field of view width by moving colored end-points with the mouse. Now, let’s look at the Camera panel located in the upper left corner of the screen. As you can see, here you can change the
installation height by choosing the necessary value from the drop-
down list or by typing the needed value into the Installation
Height field Also you can specify here such parameters as
camera Sensor Format, Aspect Ratio, Lens Focal Length and Camera Resolution in order to adapt the camera to your needs. You can notice that when you modify any camera
parameters for example Focal Length, numbers in top-right corner also get changed. The program recalculates other values
automatically. Now let’s look at the ‘Field of view’ panel located
in the upper-right corner of the program. There is a ‘Distance from camera’, where you can set the number of meters or feet
from the camera to the target. You can use the ‘Height’ parameter to set the
maximal height of the target. For example, at a distance of 20 meters you
want to see a man, which is 1.7 meters tall, or you want to see a gate which is 4 meters
high. As you can see changing Field of View Height
affects the camera tilt Using the next parameter Field of View Width you can make the field of view narrower or
wider. The last parameter is ‘Height of lower boundary’. You can specify the zone elevation starting from
the floor up. Using this feature you can cut out what you don’t
need to see. Beneath the Field of view parameters, we have a Camera 3D view window. The Camera 3D Window will show what the
camera will see. Here we can see 2 test targets. These 2 3D models of a man and a woman
show a range of camera zone. The test man is located at the target distance. In the center of the main window, right beneath
the camera there is a blind spot or a dead zone. You can clearly see where the dead zone ends. The test woman is located at the end of the
dead zone and at the beginning of the camera
zone. In other words the woman is located at the
nearest point to the camera, and the Man at the farthest.
You can tick checkboxes near the pictures of the
man and the woman above, in the ‘Field of view’, to display and hide these models. In the picture below the Camera 3D View, we can see the man’s face with licence plates. The quality of the photo is based on camera
resolution and Field of View Width. If we divide the camera Horizontal Resolution by Field of View Width (also refered to as FOV Width) we get Pixel Density. Pixel density is measured in Pixels per meter
(PPM) or pixels per foot (PPF). Pixel density is an established metric in the
surveillance industry. The higher Pixel density is, the higher quality of
the picture we get. With higher Pixel density we can distinguish
smaller details. Pixel density for the specified target distance is
shown in the status bar near the face of the test
man. The pixel density for the dead zone distance is shown near the woman’s face in the status bar Pixel density will be different if we change FOV
Width or camera resolution. Lets have a look how to minimize dead zones The first way to minimize a dead zone is to use
wider field of view or a wider lens. Another way is to install a camera at a lower
height. The third way is to decrease the height of the
Field of view

Related Posts

Review of the Thule Archway Trunk-Bike Racks on a 2015 Toyota RAV4 – etrailer.com

Today on our 2015 Toyota Rav-4, we're doing at test fit of the Thule Archway XT two-bike rack, part number
Billie Eilish Scares Her Fan Melissa McCarthy – EXTENDED
How to Track or Locate a Mobile on Google Maps ?

3 Replies to “CCTV system design. Part 1/5: Camera installation height, lens focal lenght and pixel density”

Leave a Reply

Your email address will not be published. Required fields are marked *