User manual

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54
USER MANUAL
Motion Detection Control Parameters
The unique design of MP cameras allows supporting highly accurate 64-zone
motion detection (also see Motion Detection). Motion detection is achieved by
analyzing inter-frame brightness changes on a pixel-by-pixel basis. To provide
accurate motion detection in low contrast and low light environments, EACH
pixel of EACH frame is analyzed. The user can set the size of motion detection
zones (via mdzonesize ), select the sensitivity to motion (via mdlevelthreshold ),
select the zones where the motion detection has to be blocked (via
mdprivasymask ) and specify the size of the moving objects of interest (via
mddetail ). Motion detection information can be obtained from the camera in
terms of amount of motion in each zone (via mdresult ) In addition to retrieving
motion detection information, the camera can also be configured to output
images only if motion is detected (via mdmode ).
On-camera motion detection unit utilizes up to 64 distinct zones. All zones are
square, have equal size and are arranged in 8 rows with 8 zones per row. The
zones are numbered from 0 to 63, upper leftmost zone having number 0 and
lower rightmost zone having number 63. The zones are broken into sub-zones of
size 32x32 pixels. The size of zones is specified in terms of the square root of
the number of sub-zones via parameter mdzonesize . The zones can be defined to
be as small as 7x7 sub-zones to as large as 15x15 sub-zones. By setting the limit
on how many sub-zones should contain the motion for the entire zone to be
considered to contain motion the user can effectively decide on the size of the
moving objects that should be detected. This is done via parameter mddetail .
• motiondetect ‒ enables on-camera motion detection (valid values are on
and off)
• mdmode ‒ motion detection mode for mjpeg streams(valid values are on
and off); if set to on the camera will only output an image in the
presence of motion; If the motion is not detected, the field following the
frame boundary separator --fbdr will be followed by Content-Type:
text/plain (instead of usual -Type: image/jpeg) and the image data will be
substituted with the text message no motion
• mdtotalzones - number of independent motion detection zones; Currently
must be 64. There are 8 rows of zones, 8 zones per row. Note that
depending on zone size and the camera model (image resolution in terms
of the number of pixels)some zones may not correspond to the active
image area (valid value 64)