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How to save and import gTruth objects

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Max Salter
Max Salter 2022-12-4
评论： Max Salter 2022-12-4
This seems like a simple problem, but I am trying to save a labeled image as a gTruth object from the Image Labeler. I can export from the Image Labeler to the workspace as a gTruth, but I would like to be able to load it programatically rather than manually importing to the workspace each time. When I save the gTruth variable from my workspave and load it in later, it loads as a struct, which does not work with pixelLabelTrainingData. How do I save a gTruth and have it load back as a gTruth?
% Porcelain_gTruth exists as a gTruth in the workspace from Image Labeler
save('Porcelain_gTruth.mat','Porcelain_gTruth')
% Later on
gTruth = load('Porcelain_gTruth.mat','Porcelain_gTruth');
% Now gTruth is a struct
[imds, pxds] = pixelLabelTrainingData(gTruth);
% I will get an error along the lines of:
% Error using pixelLabelTrainingData>parseInputs
% The value of 'gTruth' is invalid. Expected input to be one of these types:
%
% groundTruth
%
% Instead its type was struct.

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采纳的回答

Walter Roberson
Walter Roberson 2022-12-4
gTruth = load('Porcelain_gTruth.mat','Porcelain_gTruth');
That form of load() does not return just the variable you asked to load. That form of load() returns a struct with one field for each variable that is loaded. You need something like
data = load('Porcelain_gTruth.mat','Porcelain_gTruth');
gTruth = data.Porcelain_gTruth;

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