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: PatchDescriptionForMerge3DProcess.m
    path of file: ./repos/u-shape3D/software
    
    the code of the file until where you have to start completion: classdef PatchDescriptionForMerge3DProcess < MeshProcessingProcess
    
% PatchDescriptionFor Merge - 
%
% Copyright
    
function defaultParams = getDefaultParams(owner, varargin)
            % check inputs
            ip = inputParser;
            ip.addRequired('owner', @(x) isa(x, 'MovieObject'));
            ip.addOptional('outputDir', owner.outputDirectory_, @ischar);
            ip.parse(owner)
                        
            % find default parameters
            nChan = numel(owner.channels_);
            defaultParams = struct(); 

            defaultParams.ChannelIndex = 1:numel(owner.channels_); % see class method setPara above
            defaultParams.channels = '';
            defaultParams.InputImageProcessIndex = []; % TODO -- Process Output to use as input to the deconvolution, empty implies raw images

            % set more default parameters
            defaultParams.OutputDirectory = fullfile(ip.Results.outputDir,'Morphology','Analysis','PatchDescribeForMerge');        
        
        end