GStreamer Motion Detection Element
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The GStreamer element is called "rrmotiondetection". This element performs the motion detection stage, described in the Overview section. This element receives as input a video in RGBA or GRAY8 format and outputs a bitmask.
Main Properties
- Motion: With this property you can choose the algorithm type to use.The default is “0”. The Possible options are:
(0): mog - Background Subtractor MOG. (1): mog2 - Background Subtractor MOG2.
- Roi: With this property you can choose the region of interest and perform the motion detection only to the objects that are inside this region. By default the whole frame is taken into account. Only normalized positive values are accepted and they should be inside the image. The expected format for the ROI is x1, x2, y1, y2 where x1,y1 are the coordinates of the top left corner of the ROI and x2,y2 are the coordinates of the bottom right corner. For example;
... ! rrmotiondetection roi=“<<(float)0,(float)0.5,(float)0,(float)0.5>>” ! ...
- Sample-frequency: Specifies the sample frequency of the video. This means that the element will only perform the motion detection every n-frames, where “n” is the sample frequency. For example if you use a value of “2”, you will see one frame processed each two frames.
Capabilities
This section overviews the Motion Detection input and output capabilities.
Below is the full output of the gst-inspect-1.0 command:
Factory Details:
Rank none (0)
Long-name GstCUDA OpenCV Motion Detection
Klass Filter
Description Example implementation of a motion detection algorithm using GstCUDA and OpenCV
Author Melissa Montero <melissa.montero@ridgerun.com>, Greivin Brenes <greivin.brenes@ridgerun.com>
Plugin Details:
Name rrmotiondetection
Description Motion detection components based on OpenCV
Filename /usr/lib/aarch64-linux-gnu/gstreamer-1.0/libgstrrmotiondetection.so
Version 0.1.1
License Proprietary
Source module motion-detection
Binary package motion-detection
Origin URL www.ridgerun.com
GObject
+----GInitiallyUnowned
+----GstObject
+----GstElement
+----GstBaseTransform
+----GstCudaBaseFilter
+----GstRrMotionDetection
Pad Templates:
SRC template: 'src'
Availability: Always
Capabilities:
video/x-raw
format: GRAY8
width: [ 1, 2147483647 ]
height: [ 1, 2147483647 ]
framerate: [ 0/1, 2147483647/1 ]
SINK template: 'sink'
Availability: Always
Capabilities:
video/x-raw
format: { (string)RGBA, (string)GRAY8 }
width: [ 1, 2147483647 ]
height: [ 1, 2147483647 ]
framerate: [ 0/1, 2147483647/1 ]
video/x-raw(memory:NVMM)
format: { (string)RGBA }
width: [ 1, 2147483647 ]
height: [ 1, 2147483647 ]
framerate: [ 0/1, 2147483647/1 ]
Element has no clocking capabilities.
Element has no URI handling capabilities.
Pads:
SINK: 'sink'
Pad Template: 'sink'
SRC: 'src'
Pad Template: 'src'
Element Properties:
name : The name of the object
flags: readable, writable
String. Default: "rrmotiondetection0"
parent : The parent of the object
flags: readable, writable
Object of type "GstObject"
qos : Handle Quality-of-Service events
flags: readable, writable
Boolean. Default: false
motion : Type of motion to create
flags: readable, writable
Enum "Motion" Default: 0, "mog"
(0): mog - Background Subtractor MOG
(1): mog2 - Background Subtractor MOG2
roi : Region of Interest(ROI. Usage: <<(float)x1,(float)x2,(float)y1,(float)y2>>
flags: readable, writable
GstValueArray of GValues of type "GstValueArray"
sample-frequency : Specify the sample frequency
flags: readable, writable
Integer. Range: -2147483648 - 2147483647 Default: 1