You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: AffineFeature2D.m
    path of file: ./repos/mexopencv/opencv_contrib/+cv
    
    the code of the file until where you have to start completion: classdef AffineFeature2D < handle
    %AFFINEFEATURE2D  Class implementing affine adaptation for key points
    %
    % A cv.FeatureDetector and a cv.DescriptorExtractor are wrapped to augment
    % the detected points with their affine invariant elliptic region and to
    % compute the feature descriptors on the regions after warping them into
    % circles.
    %
    % The interface is equivalent to Feature2D, adding operations for
    % Elliptic_KeyPoint instead of KeyPoint.
    %
 
    
function save(this, filename)
            %SAVE  Saves the algorithm parameters to a file
            %
            %     obj.save(filename)
            %
            % ## Input
            % * __filename__ Name of the file to save to.
            %
            % This method stores the algorithm parameters in the specified
            % XML or YAML file.
            %
            % See also: cv.AffineFeature2D.load
            %
            AffineFeature2D_(this.id, 'save', filename);
        end

        function load(this, fname_or_str, varargin)
            %LOAD  Loads algorithm from a file or a string
            %
            %     obj.load(fname)
            %     obj.load(str, 'FromString',true)
            %     obj.load(..., 'OptionName',optionValue, ...)
            %
            % ## Input
            % * __fname__ Name of the file to read.
            % * __str__ String containing the serialized model you want to
            %   load.
            %
            % ## Options
            % * __ObjName__ The optional name of the node to read (if empty,
            %   the first top-level node will be used). default empty
            % * __FromString__ Logical flag to indicate whether the input is a
            %   filename or a string containing the serialized model.
            %   default false
            %
            % This method reads algorithm parameters from the specified XML or
            % YAML file (either from disk or serialized string). The previous
            % algorithm state is discarded.
            %
            % See also: cv.AffineFeature2D.save
            %
            AffineFeature2D_(this.id, 'load', fname_or_str, varargin{:});
        end

        function name = getDefaultName(this)
            %GETDEFAULTNAME  Returns the algorithm string identifier
            %
            %     name = obj.getDefaultName()
            %
            % ## Output
            % * __name__ This string is used as top level XML/YML node tag
            %   when the object is saved to a file or string.
            %
            % See also: cv.AffineFeature2D.save, cv.AffineFeature2D.load
            %
            name = AffineFeature2D_(this.id, 'getDefaultName');
        end