Figure 4-141
This function allows you to be informed when video is blurry, over exposure or color cast occurs. You
can enable alarm output channel and then enable show message function. Click the Rule Set button,
or move the cursor to Set button and then click the Enter button on the front panel, the interface is
shown as below. See Figure 4-142.
You can check corresponding type and then input alarm threshold.
Stripe: The strip occurs when the device is old or there is electronic interference. There may be
cross strip, vertical strip, slanting strip and etc.
Noise: The video noise refers to the blurry video, poor video quality. It may result from the optical
system distortion or the hardware problem during the video transmission when recording.
Color cast: Usually the video is color containing RGB. When these three colors displayed in
abnormal rate, we can say color cast occurred.
Out of focus: The clear video presents abundant video details. The video definition decreases when
the distortion event occurs. The out of focus event may result from many sources such as video
transmission, processing and etc.
Over exposure: The color brightness refers to the image pixel intensity. Black is the darkest and the
white is the brightest. We use number 0 to stand for black and use number 255 to stand for white.
Once the brightness threshold of the whole image has exceeded the threshold value, it means the
image is over exposure.
Threshold: The value ranges from 1 to 30. System can generate an alarm once the value is higher
than the threshold you set here.
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