Pelco DVR5100 manual Blocks. These values are derived as follows

The DVR5100 remote client views the multiple regions as one contiguous area.

•If motion occurred in 10 blocks of the smaller region and 10 blocks of the larger region, a motion event is triggered.

•If an activity occurred in all 16 blocks of the smaller region, a motion event would not be triggered. Based on the Threshold Percent setting of 28 percent, 20 blocks must detect motion before a motion event is triggered. In this case, the motion activity in the smaller region would go undetected.

In applications where you want to protect multiple regions with motion detection, it is suggested that you assign one zone to each region.

Figure 82. Motion Zone and Threshold Percent: Example 3

Understanding the Threshold Blocks Feature

The Threshold Blocks feature allows you to specify the number of blocks in a motion zone that must detect motion before initiating a motion event.

Scenario 1: Motion Zone = 100 Blocks

For example, if the motion zone has 100 blocks (maximum setting), you can set the Threshold Blocks option to 2 (minimum setting). In this case, the number of detection blocks in the motion zone can be as few as 2 (refer to Figure 83). You can adjust the threshold blocks from

2–100 blocks. These values are derived as follows:

Figure 83. Motion Zone and Threshold Blocks: Example 1

NOTE: Threshold Blocks cannot be set to a value less than 2. If you attempt to do so, the remote client will automatically readjust the value to 2.

72 C1697M-B (11/08)