Class Feature2D

    • Constructor Detail

      • Feature2D

        protected Feature2D​(long addr)
    • Method Detail

      • __fromPtr__

        public static Feature2D __fromPtr__​(long addr)
      • detect

        public void detect​(Mat image,
                           MatOfKeyPoint keypoints,
                           Mat mask)
        Detects keypoints in an image (first variant) or image set (second variant).
        Parameters:
        image - Image.
        keypoints - The detected keypoints. In the second variant of the method keypoints[i] is a set of keypoints detected in images[i] .
        mask - Mask specifying where to look for keypoints (optional). It must be a 8-bit integer matrix with non-zero values in the region of interest.
      • detect

        public void detect​(Mat image,
                           MatOfKeyPoint keypoints)
        Detects keypoints in an image (first variant) or image set (second variant).
        Parameters:
        image - Image.
        keypoints - The detected keypoints. In the second variant of the method keypoints[i] is a set of keypoints detected in images[i] . matrix with non-zero values in the region of interest.
      • detect

        public void detect​(List<Mat> images,
                           List<MatOfKeyPoint> keypoints,
                           List<Mat> masks)
        Parameters:
        images - Image set.
        keypoints - The detected keypoints. In the second variant of the method keypoints[i] is a set of keypoints detected in images[i] .
        masks - Masks for each input image specifying where to look for keypoints (optional). masks[i] is a mask for images[i].
      • detect

        public void detect​(List<Mat> images,
                           List<MatOfKeyPoint> keypoints)
        Parameters:
        images - Image set.
        keypoints - The detected keypoints. In the second variant of the method keypoints[i] is a set of keypoints detected in images[i] . masks[i] is a mask for images[i].
      • compute

        public void compute​(Mat image,
                            MatOfKeyPoint keypoints,
                            Mat descriptors)
        Computes the descriptors for a set of keypoints detected in an image (first variant) or image set (second variant).
        Parameters:
        image - Image.
        keypoints - Input collection of keypoints. Keypoints for which a descriptor cannot be computed are removed. Sometimes new keypoints can be added, for example: SIFT duplicates keypoint with several dominant orientations (for each orientation).
        descriptors - Computed descriptors. In the second variant of the method descriptors[i] are descriptors computed for a keypoints[i]. Row j is the keypoints (or keypoints[i]) is the descriptor for keypoint j-th keypoint.
      • compute

        public void compute​(List<Mat> images,
                            List<MatOfKeyPoint> keypoints,
                            List<Mat> descriptors)
        Parameters:
        images - Image set.
        keypoints - Input collection of keypoints. Keypoints for which a descriptor cannot be computed are removed. Sometimes new keypoints can be added, for example: SIFT duplicates keypoint with several dominant orientations (for each orientation).
        descriptors - Computed descriptors. In the second variant of the method descriptors[i] are descriptors computed for a keypoints[i]. Row j is the keypoints (or keypoints[i]) is the descriptor for keypoint j-th keypoint.
      • detectAndCompute

        public void detectAndCompute​(Mat image,
                                     Mat mask,
                                     MatOfKeyPoint keypoints,
                                     Mat descriptors,
                                     boolean useProvidedKeypoints)
        Detects keypoints and computes the descriptors
        Parameters:
        image - automatically generated
        mask - automatically generated
        keypoints - automatically generated
        descriptors - automatically generated
        useProvidedKeypoints - automatically generated
      • detectAndCompute

        public void detectAndCompute​(Mat image,
                                     Mat mask,
                                     MatOfKeyPoint keypoints,
                                     Mat descriptors)
        Detects keypoints and computes the descriptors
        Parameters:
        image - automatically generated
        mask - automatically generated
        keypoints - automatically generated
        descriptors - automatically generated
      • descriptorSize

        public int descriptorSize()
      • descriptorType

        public int descriptorType()
      • defaultNorm

        public int defaultNorm()
      • write

        public void write​(String fileName)
      • read

        public void read​(String fileName)
      • empty

        public boolean empty()
        Description copied from class: Algorithm
        Returns true if the Algorithm is empty (e.g. in the very beginning or after unsuccessful read
        Overrides:
        empty in class Algorithm
        Returns:
        automatically generated
      • getDefaultName

        public String getDefaultName()
        Description copied from class: Algorithm
        Returns the algorithm string identifier. This string is used as top level xml/yml node tag when the object is saved to a file or string.
        Overrides:
        getDefaultName in class Algorithm
        Returns:
        automatically generated