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Criteria editing box of person identification area

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Criteria editing box of person identification area

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Criteria editing box of person identification area

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Graphics window

Main menu

Criteria

Person identification area

Click to expand
Click to expand

 

These criteria are the following:

 

Minimal height of identification;
Maximal height of identification;
Minimal vertical size of face image (pixel);
Maximal angle between a direction on the camera and horizontal.

 

A face height is taken as equal to 0,2m (0,66 ft).

 

In multi-level 3D projects the heights in the criteria are calculated relative the Base height of the camera, for which the person detection, identification, license plate reading areas are calculated.

 

The criterion Minimal vertical size of face image (pixel) depends on vertical number of pixels. Vertical number of pixels influences person detection, identification and license plate reading areas.

For criteria calculation minimal number of pixels from parameters of camera image sensor and parameters of output image is used.

Number of pixels of image sensor is specified on the Sensitivity and Resolution box.

Number of pixels of output image is specified on the Processing tab of the Image parameter panel.

If a camera is rotated by an angle more than 45 degrees, when calculating person detection and identification, license plate reading areas,  the parameters: minimum vertical resolution (pixel/meter, pixel/ft), the minimum vertical size of face image ( pixels ), the minimum vertical size of license plate ( pix) are calculated based on the number of pixels along the horizontal, instead of the number of pixels along the vertical, as in this case the vertical side of the field of view is located along the horizontal.

In other respects the person identification area doesn't take into account rotation of camera around its axis, shadows and lens distortion.

 

If number of pixels is not set (N/A), calculation is performed for vertical 576 pixels (768 on horizontal), what corresponds to analog camera.

 

 

The criterion Maximal angle between a direction on the camera and horizontal is introduced due to the reduction of identification capacity, if a camera is viewing a person downwards, despite the adequate sizes of person face on a display.

 

 

The person identification area projection is calculated on a condition of person face hitting in the area at all the heights from the customized range. The identification condition becomes a presence of a face of person of any height.

 

The box upper part contains a quality level combo box enabling to choose any quality level. The box immediately displays the criteria values relevant to the chosen level of quality. The criteria values can be edited, by typing the new values.

 

If the quality level being edited coincides with the quality level of the active camera, all the criteria alterations are immediately taken into account when calculating the person identification area projection.

 

When moving the cursor to a box with the chosen quality level, the additional information on this quality level appears.

 

To save the introduced changes click OK.

To cancel the introduced changes click Cancel.

You can set your own criteria using the 3D Video as a control monitor and moving 3D models in the camera view area.

 

You can change the criteria values of several quality levels outright. Clicking OK saves all the introduced changes.

 

See also: Recommendations on the program use, Example 6 Determining person identification criteria by the real image , Spatial resolution box.

External link: "The principles of CCTV design in VideoCAD. Part 2. Person detection area, person identification area, license plate reading area. Spatial resolution."(*.pdf) .