|
Analog |
Analog
recording is accomplished by laying magnetic tracks on a tape. The
information is stored using strength of the magnetic fields. These
magnetic tracks will degrade through use or even just time. Copies
depend on the sensitivity of equipment used. Return To
Top |
|
|
|
|
Auto Iris |
A type of
lens in which the aperture automatically opens or closes to adjust the
light levels on the image Sensor. Return To Top |
|
|
|
|
Bullet Cameras |
Bullet
Cameras are weatherproof and can be used for either inside or outside.
Because of their universal mounting bracket they can be mounted to
surfaces at any angle. The wide angle 4mm lens is the ideal choice for
most applications. Return To Top |
|
|
|
|
Camera Electronics |
Inside each
camera is an electronics package that processes the signals from Image
Sensor and converts it into a TV signal. How well this package functions
is directly related to picture quality and why different cameras using
the same Image Sensor will produce different results.
Return To Top |
|
|
|
|
Camera Lenses |
| An important part
of selecting a particular camera is What You Want To See. The
distance of the subject from the camera, and the area you want in
the picture is a function of the lens. Different cameras have
different lens options.
Since optional lenses are not
available for all types of cameras, the lens requirements may be an
important factor in selecting cameras for your application.
Use the charts below and your
knowledge of your installation to determine the type of camera and
lens that will best suit your needs.
For Veri-Focal lenses, combine
the information in two charts to estimate the obtainable results. |
|
 |
3.6mm
1/3" Image
Sensor |
This lens is supplied with Bullet, Dome and Infrared Cameras
unless otherwise specified. It is considered to be a
"standard" lens. |
| Use
this chart to estimate the 4mm lens available on Professional
Cameras. |
|
Lens Angle |
Distance From Camera |
| |
5 ft. |
10 ft. |
15 ft. |
25 ft. |
50 ft. |
|
W° |
H° |
W
ft. |
H
ft. |
W
ft. |
H
ft. |
W
ft. |
H
ft. |
W
ft. |
H
ft. |
W
ft. |
H
ft. |
|
74° |
55° |
7.5 |
5.2 |
15.1 |
10.4 |
22.8 |
15.8 |
37.7 |
26.1 |
75.4 |
52.1 |
|
 |
6mm
1/3" Image
Sensor |
|
This lens is an option with C-Mount Professional Cameras. |
|
Lens Angle |
Distance From Camera |
| |
5 ft. |
10 ft. |
15 ft. |
25 ft. |
50 ft. |
|
W° |
H° |
W
ft. |
H
ft. |
W
ft. |
H
ft. |
W
ft. |
H
ft. |
W
ft. |
H
ft. |
W
ft. |
H
ft. |
|
42° |
32° |
3.8 |
2.9 |
7.7 |
5.7 |
11.5 |
8.6 |
19.1 |
14.4 |
38.4 |
28.7 |
|
 |
8mm
1/3" Image
Sensor |
|
This lens is an option with C-Mount Professional Cameras. |
|
Lens Angle |
Distance From Camera |
| |
5 ft. |
10 ft. |
15 ft. |
25 ft. |
50 ft. |
|
W° |
H° |
W
ft. |
H
ft. |
W
ft. |
H
ft. |
W
ft. |
H
ft. |
W
ft. |
H
ft. |
W
ft. |
H
ft. |
|
32° |
24° |
2.9 |
2.1 |
5.7 |
4.3 |
8.6 |
6.4 |
14.4 |
10.7 |
28.7 |
21.3 |
|
 |
12mm
1/3" Image
Sensor |
|
This lens is an option with C-Mount Professional Cameras. |
|
Lens Angle |
Distance From Camera |
| |
5 ft. |
10 ft. |
15 ft. |
25 ft. |
50 ft. |
|
W° |
H° |
W
ft. |
H
ft. |
W
ft. |
H
ft. |
W
ft. |
H
ft. |
W
ft. |
H
ft. |
W
ft. |
H
ft. |
|
22° |
17° |
1.9 |
1.5 |
3.9 |
3 |
5.8 |
4.5 |
9.7 |
7.5 |
19.4 |
14.9 |
|
 |
16mm
1/3" Image
Sensor |
|
This lens is an option with C-Mount Professional Cameras. |
|
Lens Angle |
Distance From Camera |
| |
5 ft. |
10 ft. |
15 ft. |
25 ft. |
50 ft. |
|
W° |
H° |
W
ft. |
H
ft. |
W
ft. |
H
ft. |
W
ft. |
H
ft. |
W
ft. |
H
ft. |
W
ft. |
H
ft. |
|
17° |
13° |
1.5 |
1.4 |
3 |
2.3 |
4.4 |
3.4 |
7.5 |
5.7 |
14.9 |
11.4 |
|
|
| |
Return To Top |
|
|
|
|
Camera Resolution |
Camera
Resolution is expressed in TV lines. It is the output of the camera and
is the result of the picture captured by the Image Sensor and the
processing of that information by the Camera Electronics.
Return To Top |
| |
|
|
CCD |
A CCD
camera uses a small, rectangular piece of silicon rather than a piece of
film to receive incoming light. This is a special piece of silicon
called a charge-coupled device (CCD). This silicon wafer is a
solid-state electronic component which has been micro-manufactured and
segmented into an array of individual light-sensitive cells called "photosites."
Each photosite is one element of the whole picture that is formed, thus
it is called a picture element, or "pixel." Return To
Top |
| |
|
|
CCTV |
Closed-circuit television. Return To Top |
| |
|
|
C/CS Pro Mount
|
Professional Cameras can be ordered with optional lens angles to provide
different fields of view. Because of their universal mounting bracket
they can be mounted to surfaces at any angle. These cameras are not
weatherproof but can be ordered with a weatherproof housing for outside
use. Return To Top |
| |
|
|
Digital |
In digital
pictures colors have numbers. The color number for each pixel in the
picture is recorded. No degradation can occur, copies are absolute.
Return To Top |
| |
|
|
Display Rate |
Refers to
the number of video images that are displayed in one second.
Return To Top |
| |
|
|
Dome Cameras |
Dome
Cameras are not weatherproof and are intended for inside use only. They
are designed to be mounted to a ceiling. The power and video leads exit
through the base of the camera and through a small hole in the ceiling.
The wide angle 4mm lens is the ideal choice for most applications.
Return To Top |
| |
|
|
DVR |
A DVR is
basically a computer that converts the incoming (analog) signal from the
cameras to digital, compresses it, and stores it. The DVR replaces the
functions of a multiplexor (or quad or switcher) and a security VCR.
There are many advantages of digital video recorders over their analog
counterparts, for example, higher frame rates and on-board motion
detection. Return To Top |
| |
|
|
Frame Rate |
Refers to
the number of video images that are captured, displayed, or recorded in
one second. Return To Top |
| |
|
|
Hard Drive Capacity |
| DVR’s DO NOT store
individual frames as single pictures. What actually gets written on
your hard drive is an MPG movie of the action recorded by each
camera. Through the use of computer algorithms, each frame is
compressed so that the resultant movie takes the minimum amount of
hard drive space. |
| |
| The chart below
shows average results based on normal conditions. |
| |
|
Hard Drive Size |
|
Recording Rate |
80Gb |
120Gb |
240Gb |
360Gb |
480Gb |
600Gb |
720Gb |
|
Hours Of Continuous Recording |
|
|
|
|
|
|
|
|
|
30fps |
229 |
344 |
688 |
1032 |
1376 |
1720 |
2094 |
|
60fps |
115 |
172 |
344 |
516 |
688 |
860 |
1032 |
|
120fps |
57 |
86 |
172 |
258 |
344 |
430 |
516 |
|
240fps |
29 |
43 |
86 |
129 |
172 |
215 |
258 |
|
Days Of
Continuous Recording |
|
30fps |
9.3 |
14.3 |
28.7 |
43.0 |
57.3 |
71.7 |
86.0 |
|
60fps |
4.7 |
7.2 |
14.3 |
21.5 |
28.7 |
35.8 |
43.0 |
|
120fps |
2.3 |
3.6 |
7.2 |
10.8 |
14.3 |
17.9 |
21.5 |
|
240fps |
1.2 |
1.8 |
3.6 |
5.4 |
7.2 |
9.0 |
10.8 |
|
| |
| The actual results
will vary due to the way the compression algorithms process the
data. Factors that will affect Hard Drive Capacity: |
|
Size: |
|
640x480 takes
more space than 320x240. |
|
Quality: |
|
High quality
movies require more space. |
|
FPS: |
|
The more frames
per second, the more space required. |
|
Motion: |
|
The more motion
in the movie, the more space required. |
|
Colors: |
|
The more color in
the movie, the more space required. |
|
| |
| As you can see, only
the actual site conditions will determine exactly how your system
will perform.
Return To Top |
|
| |
|
|
I P Address |
|
Every machine on the Internet has a
unique identifying number, called an IP Address. A typical IP
address looks like this: - 216.27.61.137 |
| |
| With a Dynamic IP
Address your Internet Provider issues you an IP Address for your
current internet session. When you log off the internet that Address
can be issued to the next person that logs on. The next time you log
on you may get an entirely different Address. |
| |
| With a Static IP
Address you have exclusive rights to that address. Each time you log
on you are assigned the same address. |
| |
| If you plan to
access your DVR over the internet you need to know its current IP
Address in order to connect with it from your remote computer. For
this reason it is highly recommended that you obtain a Static IP
Address for you DVR connection. Return To Top |
|
|
|
|
|
Image Sensor |
The image
sensor is the light sensitive chip inside the camera that converts light
into electronic signals. The face of the chip is divided into rows and
columns of pixels. Each pixel sends a signal representing the color and
brightness of the light that strikes it. Return To Top |
|
|
|
|
Infrared Cameras |
Infrared
Cameras are equipped with a group of infrared LEDs that provide infrared
lighting for cameras installed in dark areas. Infrared Cameras are
weatherproof and can be used for either inside or outside. Because of
their universal mounting bracket they can be mounted to surfaces at any
angle. The wide angle 4mm lens is the ideal choice for most
applications. Return To Top |
| |
|
|
JPEG |
JPEG stands
for "Joint Photographic Experts Group" who developed the system. This is
a standard way of compressing images which works particularly well for
photographic images Return To Top |
| |
|
|
Lux Rating |
|
According to the International System of Units, "LUX" is defined
in terms of lumens per meter squared (lm/m2). One lux is equal to
0.00146 kilogram per second cubed (1.46 x 10-3 kg / s3). One lumen
is the amount of light emitted in a solid angle of 1 sr, from a
source that radiates to an equal extent in all directions, and whose
intensity is 1 cd. |
| |
|
On a major image sensors website, LUX is defined as "Relative amount
of light that will produce a viewable image." But, How Viewable, and
in who’s opinion? |
| |
|
Then there are also the Auto Iris sensitivity and all of the other
electronics inside the camera that affect the actual picture that
you see. |
| |
|
The best way to compare cameras would be to install all of them in
your application and see what you get. Pick out the best, and return
the rest. |
| |
|
OR |
| |
| You can
look at our sample pictures and see the quality of the images before
you buy. In developing our line of cameras we did exactly the kind
of comparison you would do and only offer cameras that give you the
best value for the dollar.
Return To Top |
|
| |
|
|
Motion Detection |
A feature
on most Digital Video Recorders. A captured frame is held in memory and
digitally compared to the next frame, if a change is detected motion has
occurred and recording is begun. The sensitivity is adjustable. The DVR
can also be directed to ignore motion in parts of the picture and only
record if motion is detected elsewhere. Return To Top |
| |
|
|
MPEG |
MPEG stands
for "Motion Picture Experts Group" who developed the system. This is a
standard way of compressing video files. Return To Top |
| |
|
|
Multiplexor |
A device
that can accept a number of camera inputs and display them on a single
monitor. Return To Top |
| |
|
|
Picture Quality |
|
| |
|
|
PTZ |
PTZ cameras
allow you to adjust Pan, Tilt and Zoom of the camera using a remote
controller or DVR. Due to this added functionality, these cameras tend
to cost much more than non-PTZ cameras Return To Top |
| |
|
|
Quad Processor |
An analog
device used to display 4 cameras simultaneously on a single monitor.
Return To Top |
| |
|
|
Recording Rate |
Refers to
the number of video images that are recorded in one second.
Return To Top |
| |
|
|
Remote Monitoring |
The ability
to view your cameras from a remote location. Pictures are transmitted
via phone line, internet, or LAN. Return To Top |
| |
|
|
Time Lapse VCR |
A VCR that
can be set to slow down its recording rate in order to extend the length
of time that can be recorded on a standard tape.
Return To Top |
| |
|
|
Vari-Focal Lens |
A Vari-Focal
Lens allows you to manually select the width of the field of view. Sort
of like a manual zoom, once you get the size picture you want you lock
it in place and reassemble the camera. Ideal for situations where a
standard fixed focus lens wont do the job. Return To
Top |
| |
|
|
Video Capture Card |
The PCI
circuit board that is installed in a computer to convert the analog TV
signal from a camera into a series of digital pictures.
Return To Top |
| |
|
|
Video Compression |
Generally; digital
compression is accomplished by removing redundant information. The first
frame of a digital movie is recorded in its entirety, in subsequent
frames only those pixels that are different from the first frame are
saved. Also, algorithms are used to define blocks of pixels that are
repetitive. This is why file sizes vary depending on the amount of
motion in the recorded movie.
Return To Top
|
| |
|
|
Video Switcher |
A Video
Switcher will take multiple camera inputs and will show them on the
monitor one at a time. Unlike a quad it will not display them all at
once, instead it sequences through them showing one camera at a time. It
will also allow you to select a particular camera to view.
Return To Top |
| |
|
| |
|
