labelling image but getting error during overlay

Question

Raza Ali 2019-9-5

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https://ww2.mathworks.cn/matlabcentral/answers/478979-labelling-image-but-getting-error-during-overlay

回答： Obaid Rafiq Jan 2020-11-18

I am labelling an image using MATLAB image labeler. But when i use labeloverlay commnad in MATLAB to map original and labeled image it gives error "Pixel label image has scalar pixel label IDs instead of RGB-triplet pixel label IDs". I can only understand that the labeled image is black and white and for overlaying command it needs RGB labeled image.

how to use these labeld images ? or how to resolve this error

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Kritika Bansal 2019-9-12

Hi,

Can you also post the command that led to this error in MATLAB?

Raza Ali 2019-9-13

imageDir= fullfile('img');

labelDir= fullfile('PL');

classNames = ["A", "B"];

labelIDs = [0 0 0; 1 1 1];

imds = imageDatastore(imageDir);

pxds = pixelLabelDatastore(labelDir,classNames,labelIDs);

I = read(imds);

C = read(pxds);

Error using matlab.io.datastore.PixelLabelDatastore.label2cat (line 1033)

Pixel label image has scalar pixel label IDs instead of RGB-triplet pixel label IDs.

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Answer 1

Obaid Rafiq Jan 2020-11-18

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Hi Raza,

I was stuck on the same problem as you however, mine was the opposite. Instead you can try [0 1] which would make sense for a scalar quantity. The array that you defined for your pixel labels is an RGB triplet value which is what I should have done and it works for me. So if anyone else is having the same error as you, they just need to define each label's absolute scalar value as [x x] while if someone is having the opposite problem, they can try [x y z; x y z], where x y and z are the RGB absolute values.