Package boofcv.alg.feature.orientation

Class OrientationHistogram<D extends ImageGray<D>>

java.lang.Object
boofcv.alg.feature.orientation.OrientationHistogram<D>
All Implemented Interfaces:
OrientationGradient<D>, RegionOrientation
Direct Known Subclasses:
ImplOrientationHistogram_F32, ImplOrientationHistogram_S16, ImplOrientationHistogram_S32
public abstract class OrientationHistogram<D extends ImageGray<D>> extends Object implements OrientationGradient<D>

Estimates the orientation by creating a histogram of discrete angles around the entire circle. The angle with the largest sum of edge intensities is considered to be the direction of the region. If weighted a Gaussian kernel centered around the targeted pixel is used.

  • Field Details

    • objectToSample

      protected double objectToSample

    • radiusScale

      protected int radiusScale

    • derivX

      protected D extends ImageGray<D> derivX

    • derivY

      protected D extends ImageGray<D> derivY

    • rect

      protected ImageRectangle rect

    • numAngles

      protected int numAngles

    • sumDerivX

      protected double[] sumDerivX

    • sumDerivY

      protected double[] sumDerivY

    • angleDiv

      protected double angleDiv

    • angleRound

      protected double angleRound

    • isWeighted

      protected boolean isWeighted

    • weights

      protected Kernel2D_F32 weights

  • Constructor Details

    • OrientationHistogram

      protected OrientationHistogram(double objectToSample, int numAngles, boolean isWeighted)
      Constructor. Specify region size and if it is weighted or not.
      Parameters:
      objectToSample - Converts the size of the object to the sample region size
      numAngles - Number of discrete angles that the orientation is estimated inside of

  • Method Details

    • getObjectToSample

      public double getObjectToSample()

    • setObjectToSample

      public void setObjectToSample(double objectToSample)
      Specify the size of the region that is considered.

    • getWeights

      public Kernel2D_F32 getWeights()

    • setObjectRadius

      public void setObjectRadius(double objectRadius)
      Description copied from interface: RegionOrientation
      Specifies the circle's radius that the orientation should be
      Specified by:
      setObjectRadius in interface RegionOrientation
      Parameters:
      objectRadius - Object's radius.

    • setImage

      public void setImage(D derivX, D derivY)
      Description copied from interface: OrientationGradient
      Specifies input image data for estimating orientation.
      Specified by:
      setImage in interface OrientationGradient<D extends ImageGray<D>>
      Parameters:
      derivX - Image derivative along x-axis.
      derivY - Image derivative along y-axis.

    • compute

      public double compute(double X, double Y)
      Description copied from interface: RegionOrientation
      Computes the orientation of a region about its center.
      Specified by:
      compute in interface RegionOrientation
      Parameters:
      X - Center of the region in image pixels.
      Y - Center of the region in image pixels.
      Returns:
      Orientation in radians. Angle zero points along x-axis and pi/2 along y-axis.

    • computeUnweightedScore

      protected abstract void computeUnweightedScore()
      Compute the score without using the optional weights

    • computeWeightedScore

      protected abstract void computeWeightedScore(int c_x, int c_y)
      Compute the score using the weighting kernel.