BackgroundSubtractorGMG

Objective-C

@interface BackgroundSubtractorGMG : BackgroundSubtractor

Swift

class BackgroundSubtractorGMG : BackgroundSubtractor

Background Subtractor module based on the algorithm given in CITE: Gold2012 .

Takes a series of images and returns a sequence of mask (8UC1) images of the same size, where 255 indicates Foreground and 0 represents Background. This class implements an algorithm described in “Visual Tracking of Human Visitors under Variable-Lighting Conditions for a Responsive Audio Art Installation,” A. Godbehere, A. Matsukawa, K. Goldberg, American Control Conference, Montreal, June 2012.

Member of Bgsegm

Methods

  • Returns the status of background model update

    Declaration

    Objective-C

    - (BOOL)getUpdateBackgroundModel;

    Swift

    func getUpdateBackgroundModel() -> Bool

  • Returns the prior probability that each individual pixel is a background pixel.

    Declaration

    Objective-C

    - (double)getBackgroundPrior;

    Swift

    func getBackgroundPrior() -> Double

  • Returns the value of decision threshold.

     Decision value is the value above which pixel is determined to be FG.

    Declaration

    Objective-C

    - (double)getDecisionThreshold;

    Swift

    func getDecisionThreshold() -> Double

  • Returns the learning rate of the algorithm.

     It lies between 0.0 and 1.0. It determines how quickly features are "forgotten" from
 histograms.

    Declaration

    Objective-C

    - (double)getDefaultLearningRate;

    Swift

    func getDefaultLearningRate() -> Double

  • Returns the maximum value taken on by pixels in image sequence. e.g. 1.0 or 255.

    Declaration

    Objective-C

    - (double)getMaxVal;

    Swift

    func getMaxVal() -> Double

  • Returns the minimum value taken on by pixels in image sequence. Usually 0.

    Declaration

    Objective-C

    - (double)getMinVal;

    Swift

    func getMinVal() -> Double

  • Returns total number of distinct colors to maintain in histogram.

    Declaration

    Objective-C

    - (int)getMaxFeatures;

    Swift

    func getMaxFeatures() -> Int32

  • Returns the number of frames used to initialize background model.

    Declaration

    Objective-C

    - (int)getNumFrames;

    Swift

    func getNumFrames() -> Int32

  • Returns the parameter used for quantization of color-space.

     It is the number of discrete levels in each channel to be used in histograms.

    Declaration

    Objective-C

    - (int)getQuantizationLevels;

    Swift

    func getQuantizationLevels() -> Int32

  • Returns the kernel radius used for morphological operations

    Declaration

    Objective-C

    - (int)getSmoothingRadius;

    Swift

    func getSmoothingRadius() -> Int32

  • Sets the prior probability that each individual pixel is a background pixel.

    Declaration

    Objective-C

    - (void)setBackgroundPrior:(double)bgprior;

    Swift

    func setBackgroundPrior(bgprior: Double)

  • Sets the value of decision threshold.

    Declaration

    Objective-C

    - (void)setDecisionThreshold:(double)thresh;

    Swift

    func setDecisionThreshold(thresh: Double)

  • Sets the learning rate of the algorithm.

    Declaration

    Objective-C

    - (void)setDefaultLearningRate:(double)lr;

    Swift

    func setDefaultLearningRate(lr: Double)

  • Sets total number of distinct colors to maintain in histogram.

    Declaration

    Objective-C

    - (void)setMaxFeatures:(int)maxFeatures;

    Swift

    func setMaxFeatures(maxFeatures: Int32)

  • Sets the maximum value taken on by pixels in image sequence.

    Declaration

    Objective-C

    - (void)setMaxVal:(double)val;

    Swift

    func setMaxVal(val: Double)

  • Sets the minimum value taken on by pixels in image sequence.

    Declaration

    Objective-C

    - (void)setMinVal:(double)val;

    Swift

    func setMinVal(val: Double)

  • Sets the number of frames used to initialize background model.

    Declaration

    Objective-C

    - (void)setNumFrames:(int)nframes;

    Swift

    func setNumFrames(nframes: Int32)

  • Sets the parameter used for quantization of color-space

    Declaration

    Objective-C

    - (void)setQuantizationLevels:(int)nlevels;

    Swift

    func setQuantizationLevels(nlevels: Int32)

  • Sets the kernel radius used for morphological operations

    Declaration

    Objective-C

    - (void)setSmoothingRadius:(int)radius;

    Swift

    func setSmoothingRadius(radius: Int32)

  • Sets the status of background model update

    Declaration

    Objective-C

    - (void)setUpdateBackgroundModel:(BOOL)update;

    Swift

    func setUpdateBackgroundModel(update: Bool)