VideoCAD

Spatial resolution

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Spatial resolution

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Spatial resolution

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Graphics window

Tool bar

 Spatial resolution

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View area of cameras can be divided into regions based on the following criteria:

 

vertical or horizontal spatial resolution (pixels/meters, pixels/foot);

 

vertical or horizontal field of view size (meter, foot);

 

vertical or horizontal number of pixels covered by an object of the specified height(width) (meter, foot);

 

the part of the frame height(width) covered by an object of the specified height(width)  (meter, foot).

 

 

 

These Criteria relates to the spatial resolution or the field of view size. For short, in the definitions, it is mentioned the spatial resolution only (the Spatial resolution box, the Spatial resolution pattern, the Spatial resolution criterion ...), except of special cases.

 

In the Graphics window, projection of different regions of view area can be filled by different color and (or) type of hatching.

Changing the spatial resolution under the influence of the lens distortion is considered along radial rays from the center of the frame to the edges, without distinguishing between horizontal and vertical.

 

Spatial resolution pattern

 

- contains information about the regions and how they are filled and (or) hatched.

VideoCAD project can contain up to 30 spatial resolution patterns. Each pattern can include up to 10 regions. You can assign different patterns to different cameras.

 

Spatial resolution box

 

- is designed for creating and editing the patterns of spatial resolution and field of view size visualization.

In the box there are prepared spatial resolution patterns according to the following criteria:

 

Home Office Scientific Development Branch;
Home Office Guidelines for identification;
P 78.36.008-99;
Australian Standard AS4806: Closed Circuit Television;
European Standard EN 50132-7;
ISO/IEC 19794 Biometric data interchange formats.

 

Individual patterns can be customized according to any other criteria related to the spatial resolution or the field of view size.

 

Also in the box there are examples of images of group of people are automatically displayed for each region of spatial resolution.

 

It is convenient to keep the Spatial resolution box opened during the analysis of spatial resolution in the Graphics window. Comparing color of regions on the layout with color in table in the spatial resolution box, on the images in the Resolution and Field of view columns you can immediately see the expected resolution and  field of view size at every point of view area of each camera.

 

See further : Tools in the Spatial resolution box, Work with the Spatial resolution box.

See also: Spatial resolution, Fill projection, Visualization of cameras' control area projections and spatial resolution inside them.