Work with the Pixel density box

2. Choose a pattern for editing in the Pattern combo box.

3. Click the Edit button. Caption on this button will be changed to Save. Parameters of the chosen pattern will become accessible for editing.

4. If necessary, edit the Name of the pattern in the Pattern box by the keyboard.

5. Choose direction (horizontal or vertical) and criterion in the Pattern criterion combo box.

6. Specify Height at which the criterion values should be calculated.

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If in the Height box AUTO is chosen and in the View area projection bounds and Shadow buttons the Within projection is chosen, then calculation of pixel density in the horizontal projection is carried out at the middle height between the view area lower bound height and the view area upper bound height.

•	If in the Height box of the Pixel density box, AUTO is chosen and in the View area projection bounds and Shadow buttons the 2 levels is chosen, then calculation of pixel density in the horizontal projection is carried out at the view area lower bound height

7. In case of chosen criteria is related to an object (Pixel for object, % of Field-of-view for object), choose the object height(width) in the Object height (width) box.

8. If the type of hatching is needed to show, clear the Blend/Hatch box.

9. Specify values of the criterion at far bound of each region in the Table of regions.

When editing the values of criteria, you must comply with the following rules:

9.1 The bottom row of the table should correspond to the closest to the camera region, and thus must have:

•	maximum pixel density (the maximum value of the criterion Pixel per meter);

•	any object must cover the maximum number of pixels (the maximum value of the criterion Pixel for object);

•	minimum size of the field of view (the minimum criterion Field-of-view height (width));

•	any object must cover maximum part of the field of view (the maximum value of the criterion % of Field-of-view for object).

9.2 The values of the criteria should be edited consistently from region to region, starting from the closest to camera region (bottom row). For example, if the criterion is Pixel per meter, then in the bottom row should be the maximum pixel density, and in each subsequent row criterion value must be less than the row below.

If this rule is violated then the boxes with wrong values would be red highlighted.

9.3 In the editing mode, the table unfolds and shows the maximum number of region in the pattern (10). If you need a smaller number of regions, the "extra" regions must have equal values of the criterion. "Unnecessary" regions should be placed one after another at the top of the table.

10. You can edit the Name of each region in the Name box, choose a color that will be used for displaying the region in the Graphics window by clicking on the Color button , choose hatch style in the Hatch style. combo box.

Hatching will be visible in the Pixel density box when the Blend/Hatch box is not checked.

In the Graphics window, hatching of the chosen type will be shown for cameras, which have chosen Hatching in the menu of the Fill projections button.

11. On the images in the Resolution column, you can see with which resolution people at the far bound of each region will be visible.

On the images in the Field of view column, you can see which part of the field of view people at the far bound of each region will cover.

Sample images are correct for the cameras with vertical number of pixels specified in the Vert.(Horiz.) number of pixel combo box .

12. When editing pattern will be finished, click the Edit/Save button once again.

To assign a pattern, displayed in the Pixel density box to a camera:

1. Activate the camera.

2. Click on the Assign button.

If the To selected cameras box is checked, then the chosen pattern is assigned to all selected cameras.

Help URL: http://www.cctvcad.com/videocad_help/index.html?spatial_resolution_edit.htm