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BlobCountingObjectsProcessing Class

Motion processing algorithm, which counts separate moving objects and highlights them.
Inheritance Hierarchy
SystemObject
  Accord.Vision.MotionBlobCountingObjectsProcessing

Namespace:  Accord.Vision.Motion
Assembly:  Accord.Vision (in Accord.Vision.dll) Version: 3.8.0
Syntax
public class BlobCountingObjectsProcessing : IMotionProcessing
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The BlobCountingObjectsProcessing type exposes the following members.

Constructors
  NameDescription
Public methodBlobCountingObjectsProcessing
Initializes a new instance of the BlobCountingObjectsProcessing class.
Public methodBlobCountingObjectsProcessing(Boolean)
Initializes a new instance of the BlobCountingObjectsProcessing class.
Public methodBlobCountingObjectsProcessing(Int32, Int32)
Initializes a new instance of the BlobCountingObjectsProcessing class.
Public methodBlobCountingObjectsProcessing(Int32, Int32, Boolean)
Initializes a new instance of the BlobCountingObjectsProcessing class.
Public methodBlobCountingObjectsProcessing(Int32, Int32, Color)
Initializes a new instance of the BlobCountingObjectsProcessing class.
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Properties
  NameDescription
Public propertyHighlightColor
Color used to highlight motion regions.
Public propertyHighlightMotionRegions
Highlight motion regions or not.
Public propertyMinObjectsHeight
Minimum height of acceptable object.
Public propertyMinObjectsWidth
Minimum width of acceptable object.
Public propertyObjectRectangles
Rectangles of moving objects.
Public propertyObjectsCount
Number of detected objects.
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Methods
  NameDescription
Public methodEquals
Determines whether the specified object is equal to the current object.
(Inherited from Object.)
Protected methodFinalize
Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.
(Inherited from Object.)
Public methodGetHashCode
Serves as the default hash function.
(Inherited from Object.)
Public methodGetType
Gets the Type of the current instance.
(Inherited from Object.)
Protected methodMemberwiseClone
Creates a shallow copy of the current Object.
(Inherited from Object.)
Public methodProcessFrame
Process video and motion frames doing further post processing after performed motion detection.
Public methodReset
Reset internal state of motion processing algorithm.
Public methodToString
Returns a string that represents the current object.
(Inherited from Object.)
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Extension Methods
  NameDescription
Public Extension MethodHasMethod
Checks whether an object implements a method with the given name.
(Defined by ExtensionMethods.)
Public Extension MethodIsEqual
Compares two objects for equality, performing an elementwise comparison if the elements are vectors or matrices.
(Defined by Matrix.)
Public Extension MethodTo(Type)Overloaded.
Converts an object into another type, irrespective of whether the conversion can be done at compile time or not. This can be used to convert generic types to numeric types during runtime.
(Defined by ExtensionMethods.)
Public Extension MethodToTOverloaded.
Converts an object into another type, irrespective of whether the conversion can be done at compile time or not. This can be used to convert generic types to numeric types during runtime.
(Defined by ExtensionMethods.)
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Remarks

The aim of this motion processing algorithm is to count separate objects in the motion frame, which is provided by motion detection algorithm. In the case if HighlightMotionRegions property is set to , found objects are also highlighted on the original video frame. The algorithm counts and highlights only those objects, which size satisfies MinObjectsWidth and MinObjectsHeight properties.

Note Note
The motion processing algorithm is supposed to be used only with motion detection algorithms, which are based on finding difference with background frame (see SimpleBackgroundModelingDetector and CustomFrameDifferenceDetector as simple implementations) and allow extract moving objects clearly.

Sample usage:

// create instance of motion detection algorithm
IMotionDetector motionDetector = new ... ;
// create instance of motion processing algorithm
BlobCountingObjectsProcessing motionProcessing = new BlobCountingObjectsProcessing( );
// create motion detector
MotionDetector detector = new MotionDetector( motionDetector, motionProcessing );

// continuously feed video frames to motion detector
while ( ... )
{
    // process new video frame and check motion level
    if ( detector.ProcessFrame( videoFrame ) > 0.02 )
    {
        // check number of detected objects
        if ( motionProcessing.ObjectsCount > 1 )
        {
            // ...
        }
    }
}
See Also