Operating instructions

SD Advanced

Mode The zone mode identies when the reference image is taken for

triggering VMD. The options are:

Normal - The reference image is updated

approximately every second. This will

only allow small changes in the scene

without triggering.

Last trigger - The reference image is only updated

when the VMD is triggered and is best

used under controlled lighting, i.e.

so there are no false triggers due to

ambient light changes.

Static - The reference image is collected on

startup and is never updated. This

would be used in ‘sterile’ areas where

there are no changes expected.

Zone disabled - This will disable the zone mode.

Pixel Count (%) This value is set as a percentage and equates to the percentage

of pixels in the selected zone that must change for the VMD event

to be triggered. The default setting is 20%.

Pixel Change (%) This setting is a percentage value of the overall change required

in the grayscale to be included in the pixel count. The percentage

change is dened over the complete range of black to white, a

100% pixel change would be from black to peak white. The default

setting is 20%.

Reload Image (Red) This will update the reference image to the latest view during

set up.

Clear All (Green) Removes all dened zones from the image.

Default Grid (Yellow) Displays the default 16 zone grid across the whole image.