Changing other People Detection Settings
The Settings screen shows the configuration of the currently selected VT unit. There are 15 settings you can change here. For many of these you can also use the Tune button on the VT Setup tab to make changes. To change settings:
- Go to the Settings tab and click button 1, Read settings from module.
- Double-click a green entry in the Numeric Settings grid.
- Make selections in the dialogue box which appears, and click OK.
- Click button 4, Send settings to module.
- MinDetect (Person Size)
- Sets the minimum number of pixels to be counted as a person. This can be between 1 and 16.
- MinSeparation (Person Size and Crowds)
- The gap, in pixels, needed between two people walking side-by-side for them to be seen as two people. A larger gap gives a conservative count, a smaller gap is better for crowds.
- FreezeTime (Background)
- Sets the time in seconds for which the background is frozen when a person is present. See Section for details.
- ThresholdLevel (Background and contrast)
- The ThresholdLevel determines the contrast required between person and background. To help detection against darker backgrounds, reduce the level by 4. Levels down to 8 are acceptable (Section ).
- BlobMidSplit (Tailgating and Crowds)
- When two people are following one another closely it is sometimes not possible to see the gap between them. This may be because the gap is bridged by shadows or perhaps a swinging arm or leg. The BobMidSplit looks for this and splits them into two different areas of pixels (in a similar way to Diagonal Splitting). Set to 1 to enable splitting (when counting crowds for instance), or 0 to disable.
- DwellEnable (Dwell Meter)
- If you have purchased the Dwell Meter, select 1 to enable it. Otherwise leave the setting at 0.
- Display Type (Zone Display)
- When recording, enter 136 to show flashing lines on the picture whenever anyone is counted. Enter 8 to hide the flashing lines.
- Video Out
- Set to 1 to turn the video out signal on, and 0 to turn it off.
- Typical Area (Person Size)
- The typical area is the space occupied on the screen by typical person (in pixels squared).
- Typical Width (Person Size)
- The typical width is used to decide if an object is one or two people.
- Double Probability (Person Size and Crowds)
- Use this setting to predict whether a large is object is one or two people. If people tend to walk very close together, set the Double Probability to 1 to tell the software to count two people. Otherwise, if it is more likely to be one big person, then set the Double Probability to 0.
- Shadow Rejection
- If you think the software counting shadows, then set the Shadow Rejection to 1. (When you test the accuracy of the system, as in Section , it will tell you if it thinks shadows are causing a problem.
- Diagonal Splitting (Crowds)
- There are times when two close-together people may be regarded as one person. They then move far enough apart to be distinguished as two objects. If both objects are more than half the typical area, they are counted as two people. If one of the areas is small it is ignored. If both are of an intermediate size the Diagonal Splitting factor comes into play. Set to 1 to enable close following, counting two people (useful in crowded situations). Set to 0 to disable splitting into two people, counting as one person (useful with cameras on low ceilings). (If the two areas separate by more than 3 pixels then they will be counted as two people, whatever your Diagonal Splitting setting.)
- Zone Lines (Zone Display)
- Set to 1 to hide the zone marker lines on the television, and 0 to show them.
- Flash Lines
- Set to 1 to show flashing lines on the television whenever anyone is counted. Set to 0 to hide the flashing lines.
Manual ref: VT-2.04, June 2007 |
Next: Settings summary. |