Re-trigger motion detection
Answered
Provide the option to re-trigger a motion detection.
On motion detection the image acquired is before the object enters the view.
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Official comment
Hi P Roets
We do not have the option to re-trigger a motion detection.
Getting a thumbnail at the exact timestamp is hardware intensive, so, it is been rounded to the nearest key frame, and the default value is "after".
So this:
http://localhost:7001/ec2/cameraThumbnail
Is equal to this:
http://localhost:7001/ec2/cameraThumbnail?method=after
But you can change it to this:
http://localhost:7001/ec2/cameraThumbnail?method=before
or
http://localhost:7001/ec2/cameraThumbnail?method=precise
In this way you can collect the best applicable thumbnail based on your situation.
Increasing the number of keyframes can also be a solution, but is also more hardware intensive for both server and camera. Also the required bandwidth will increase as well.In case of LPR systems for example, when there is a big variation on which frame the motion is triggered due to big difference in speed of the object, it might be more useful to create bookmarks instead of Thumbnail so the capture rate of the event is near 100%.
See the /ec2/bookmarks/add section of the API.Comment actions -
HI P Roets,
Motion detection is a feature that determines if there are pixel changes and consider these changes as motion detection. Where sensitivity 1 desires more pixel changes with significant more contrast than sensitivity 9 where the fewer pixels are required to change and the contrast could be less. Sensitivity 0 will ignore the motion detection.
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We understand the principle of motion detection. Our query is more related to what would constitute the next trigger event.
i.e. upon no pixel change for 200ms within the viewing area, the motion trigger would be reset (or re-armed) as to register the next pixel change as a new motion event.
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Hi P Roets
Motion detection isn't time related.
The two parameters used are; how much the average pixel light should be changed in motion square to detect motion and how much motion squares should be to detect motion.
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Hi P Roets
Al long as there is motion it is an event. When the motion stops and occurs again, it is another event. All with the logic in mind required to have a motion detection in the first place.
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