Sony SNC-CS50P - Manual (Page 9)

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The “IMD” function incorporated in the Sony
SNC-RX550/RZ50/CS50 Series of network cameras makes
further strides in motion-detection functionality. By
utilizing a sophisticated and robust movement-detection
algorithm, these cameras drastically lower the number of
false alarms.
Conventional methods, as described earlier, compare the
difference between two adjacent frames; however, “IMD”
utilizes 15 frames to determine whether or not to trigger
an alarm (Fig. 1). By analyzing more frames and
movement patterns, “IMD” can distinguish the difference
between the movement of actual objects or persons that
are supposed to trigger an alarm and repeated motion
patterns such as shaking leaves on a tree and ripples in
water that are not supposed to trigger an alarm. As a
result, accidental alarm triggers are minimized. This sophisticated algorithm also minimizes false alarms
that can result from camera vibration, and can
differentiate between moving objects and shadows,
further increasing the accuracy of motion detection.
Moreover, the “IMD” function can be used when the
camera is operating in MPEG-4, JPEG, and dual-encoding
(MPEG-4/JPEG) modes.
Motion Vector
Intelligent Motion Detection (IMD) *1
Disregards repeated motion patterns
IMD triggered by truck movement
Detection by comparing 15 frames
Fig. 1 IMD Frame Comparison *2
*1 The “IMD” function cannot be used when the camera is operating in H.264 mode.
*2 The figure above shows sample images to depict “IMD”. The markings on the images do not appear on the monitoring display. They are used for
illustration purpose only.