How to edit the label Definitions of data labelled using lidar labeller app

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gaurav 2024-4-8

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https://ww2.mathworks.cn/matlabcentral/answers/2104091-how-to-edit-the-label-definitions-of-data-labelled-using-lidar-labeller-app

评论： Manikanta Aditya 2024-4-8

while trying to edit the label definition i used this code:

% Extract data from old ground truth.
dataSource = gTruth.DataSource;
labelDefs  = gTruth.LabelDefinitions;
labelData  = gTruth.LabelData;
% Replace oldName with newName
oldName = 'Pedestrian'; newName = 'Pedestrain';
labelDefs.Name = strrep(labelDefs.Name, oldName, newName);
labelData.Properties.VariableNames = strrep(labelData.Properties.VariableNames, oldName, newName);
% Create new groundTruth object
newGTruth = groundTruth(dataSource, labelDefs, labelData);

But got this error:

Error using groundTruth

Expected input to be one of these types:

groundTruthDataSource

Instead its type was vision.labeler.loading.PointCloudSequenceSource.

Error in groundTruth/validateDataSource (line 1677)

validateattributes(dataSource, {'groundTruthDataSource'},...

Error in groundTruth/set.DataSource (line 834)

dataSource = validateDataSource(this, dataSource);

Error in groundTruth (line 351)

this.DataSource = dataSource;

how to resolve it.

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Manikanta Aditya 2024-4-8

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The error message indicates that the dataSource you’re trying to use to create a new groundTruth object is of type 'vision.labeler.loading.PointCloudSequenceSource', but it expects a 'groundTruthDataSource'.

The 'groundTruth' function in MATLAB expects the 'dataSource' to be an instance of 'groundTruthDataSource' or a cell array of file names. If your data source is a point cloud sequence, you might need to convert it to a format that groundTruth can accept.

Here’s a general way to create a 'groundTruthDataSource':

% Create a fileDatastore object
fds = fileDatastore(location, 'ReadFcn', @load, 'FileExtensions', '.mat');
% Create a groundTruthDataSource object
gTruthDataSource = groundTruthDataSource(fds);

Replace location with the location of your data files. The @load function is used to read the data files, and .mat is the file extension of the data files.

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