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CCTV
Lens Calculator is a free useful Lens Calculator
for CCTV design. Along with the traditional feature of many Lens
Calculators - calculation of the angle of view and field-of-view
size depending on the distance and the Lens focal length, this
CCTV Lens Calculator offers several new, more effective tools.
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- Choose
the most suitable lenses, heights and locations for camera installation
to provide required parameters of view areas.
- Calculate
the horizontal
projection sizes of view areas to draw them on the location
plan.
- The
calculation of the projections is performed in 3D coordinate
system, depending on parameters
and height
of the camera, required range of heights and the maximum
distance of video surveillance. It is convenient to use
the resulting projection to draw them on the location plan during
CCTV design in any graphics program.
- CCTV
Lens Calculator can correctly calculate all possible camera
positions not only the standard
one.
- Calculate
values of pixel density (spatial resolution) at specified distances
for panoramic (fish-eye) cameras.
- Choose
optimal camera
resolution for any specific tasks.
- Calculate
distances from the camera up to which the specified criteria
of pixel density (spatial resolution) and field-of-view size are satisfied.
It is convenient to mark these distances on the obtained projections
during CCTV design in any graphics program. The default values
of these criteria of pixel density correspond to the five
regions according to the CCTV
Operational Requirements Manual 2009: Monitor and Control,
Detect, Observe, Recognize, Identify.
- Calculate
values of pixel density and field-of-view
size at specified
distances from the camera.
- Visually,
using automatically scalable
pictures, estimate details of images of various objects
at specified distances from the camera or with specified values
of pixel density. CCTV Lens Calculator
contains photos
and models of people and a car with license plate. You can
add your own pictures.
- CCTV
Lens Calculator allows to model images from megapixel
cameras, up to hundred of megapixels using PiP
(Picture in Picture) technology.
- CCTV
Design Lens Calculator allows to model images from panoramic
(fish-eye) cameras.
- The
Lens Calculator has Digital
ZOOM tool for more accurate estimation of resolution.
- CCTV
Lens Calculator allows to export
the results of calculation and models of images as screenshots
in formats *. bmp, *. jpg, *. gif, *. tiff, *. png. You can
also copy the results and images to the clipboard.
- CCTV
Lens Calculator can operate metric (meters) and imperial (foot)
measurement systems.
- Tools
of CCTV Design Lens Calculator are based on VideoCAD
CCTV Design Software.
Limitations:
CCTV
Design Lens Calculator calculates the pixel density by a
simplified way, along the main optical axis of the camera. Height
of the camera, camera tilt angle and height of measurements of
the pixel density are not taken into account. These parameters
are used only for calculating view area projections.
When
modeling resolution only the number of pixels is taken into account.
Other factors affecting the detail of object images (compression,
lens resolution, contrast, noise, etc.) are not counted. Thus,
the models demonstrate the maximum possible image detail of an
object with the specified pixel density. The real image of
the object may be less detailed.
In
modeling pixel density using pictures, the simulated pixel density
can not exceed the pixel density of the pictures.
CCTV
Design Lens Calculatot does not take into account lens
distortion (except panoramic cameras with fish eye lens).
When
calculating pixel density and modeling images from panoramic
cameras, it is assumed that the fish-eye lens has ideal
barrel distortion, even distribution of pixels on the field of
view in the form of hemisphere and angle of view of 180 degrees.
If
necessary, you may consider some of nonregistering factors using
corrective factors, or use much more powerful CCTV design software
- VideoCAD.
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