Video Detection

Video detection module for interaction with a camera.

Works as a motion detector, light zones or dark zones detection.

Example of 2 zones detected in motion mode:

Example where a sample is reversed when a zone is detected and where the horizontal position of the zone change the start position of the sample:

Settings

video in

Video input flow(s).

luminance

Gives the average luminance of the current frame.

max value

  • In motion detection mode gives the maximum of the difference between the current frame and the previous frame.
  • In light zones mode gives the maximum luminance of the current frame.
  • In dark zones mode gives (256 - minimum luminance) of the current frame. Can be helpful for calibration and to adjust the threshold value.

detect mode

Detection mode.

  • motion: detects the movements.
  • light zones: detects light or white zones.
  • dark zones: detects darks or black zones.

threshold

Detection threshold and sensibility.

  • 0 always detected.
  • 255 never detected.

group tolerance

Determines if zones which are close together are grouped into a single zone.

  • 0 not grouped
  • 10 if the distance between two zones is less than 10 pixels they are grouped together.
  • etc.

nb zones found

Number of detected zones.

detected

Array of 0 or 1 with a nb zone found length.

For example if 3 zones are detected this output is the array [1,1,1].

zones X

X position of all the zones. Array of single (0..1) which gives the position of each zone on the X axis.

For example [0.23,0.67,0.96] is for a 3 zones detection, the first X position is at 0.23 the second at 0.67 and so on.

zones Y

Y position of all the zones. Array of single (0..1) which gives the position of each zone on the Y axis.

For example [0.23,0.67,0.96] is for a 3 zones detection, the first Y position is at 0.23 the second at 0.67 and so on.

surfaces

Array of single which gives the surface of each zone. The surface is (width x height).

barycenter X

Coordinates of the barycenter X of all the zones. It's the average position.

barycenter Y

Coordinates of the barycenter Y of all the zones. It's the average position.

detected N

Sends a 1 value if the Nth zone is detected.

zone X

Position of the X Nth zone.

zone Y

Position of the Y Nth zone.

surface

Surface of the Nth zone.

See also

version 3.0.150

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