Recommendations on the program use

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Recommendations on the program use

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       Precision in calculations


VideoCAD calculates results on the base of laws of geometrical optics, video sensor's characteristics, lighting engineering and radiometry. Mathematical precision in VideoCAD calculations is not less than ±1 %.

At the same time, parameters of real cameras and lenses are not so precise.

The difference with reality depends on the accuracy of the input data.

A big influence on the accuracy of camera modeling has accuracy of specifying image sensor sizes. For wide-angle lens consideration of lens distortion is very important.

Nobody can guarantee that just your camera and lens have no significant inequality of focal length value with the one declared in the specification. It is advisable to test a camera with a lens practically in especially crucial cases.

If not performing such a test, it is recommended to leave a reserve about 10-15 % in the results.


See also: About camera sensitivity, Measuring real view angles, Specifying active area size of the image sensor, About lens distortion



       Calculation of horizontal projections of person detection, identification and license plate reading areas.


Horizontal projections of person detection, identification and license-plate reading areas are calculated strictly according to the criteria numerical values specified. In case the projection sizes are not suitable, it is recommended to understand, which criteria might cause the restrictions. Probably, in your case it is possible to sacrifice some values and obtain a sufficient projection with a less capacity of detection, identification or reading.


See also: Pixel density.



       Numerical values criteria of person identification and license plate reading.


Criteria themselves are very subjective and depend on a number of external factors.

For instance, the license plate reading capacity, beside lighting, depends on weather conditions, road down-grade, etc. The person identification might depend on such factors as, whether people in a place of surveillance are looking upwards or downwards, whether the familiar or unfamiliar people are being identified, whether people in a place of surveillance wear headgear, etc. The numerical values specified in the program by default are rough and are given with some reserve. It is recommended to formulate your own numerical values of criteria proceeding from your requirements, type them in VideoCAD and apply them according to actual conditions in a place of surveillance.


With the help of 3D modeling video surveillance scenes and image quality you can make own criteria values, having several examples of images from your video system.  

In more detail the process of determination own criteria is viewed in the Example 6  Determining person identification criteria by a real image.


Eventually, you would be able to estimate the required quality level for each individual case.



       Program speed and system requirements


Recommended minimum system requirements:


IBM compatible computer with 2 Core processor;
1 Gb of RAM;
1 Gb of free hard disk space;
SVGA video adapter with Open GL 3D Hardware support;
Windows 2000, Windows XP, Windows Vista, Windows 7, Windows 8, Windows 10 operating system;
Wheel Mouse;


As with other CAD software, real system requirements greatly depend on complication of your working materials.

If you use a lot of 3D models, background file of tens of megabytes, you need more productive hardware.

But you can simplify your materials and make the same work on outdated computer. Thus there can't be clear system requirements which are correct in all cases.

Program speed depends on several factors.

Redraw speed of the image depends on number and complexity of displayed 3D models and the size of opened 3D Video. VideoCAD offers powerful but resource-intensive operations for image processing, which can be enabled or disabled.

The speed is considerably decreased when modeling illumination, depth of field exposure, rolling shutter, animation. The speed is decreased in a less degree when modeling interlace, using PiP, modeling lens distortion, using gradient..

Compression modeling and other additional image processing reduces speed to some extend.

You can quickly enable and disable all image processing with the help of the 3D Video>Main menu>Speed>Disable image processing.

Using the 3D Video>Main menu>Speed>Redraw 3D image only by clicking you can avoid unnecessary redrawing the 3D view.


When working with a project with a many complex 3D models, it is recommended to move complex 3D models to a separate layer and show this layer only for the time of generation of output images.


The 3D Video and 3D World windows opened simultaneously decelerate program speed.

It is recommended to enable the resource-intensive operations only when needed and disable them during normal operation.

VideoCAD Lite and VideoCAD Starter may seem less demanding of computer resources because of absence of resource-intensive tools. However, these tools when they are not needed, can be disabled in version Professional too.


See also: Errors in rendering 3D images



       Mastering VideoCAD


Please start your acquaintance with the program with the overview tutorial article First project with VideoCAD, step by step. The article describes beginning of practical work with VideoCAD 9 Professional.


Other teaching articles are based on previous versions of VideoCAD. They lack new tools, but particular topics are considered in detail.


To master the program it will be very useful to get acquaintance with The principles of CCTV design in VideoCAD articles. See also Examples of work with VideoCAD,

See video tutorials on CCTVCAD Software on Youtube