Unable to export gTruth from Image Labeller session

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Peter Matthews
Peter Matthews 2019-11-21
回答： Ali Osman Gökcan 2022-12-5
Hi all,
I've recently encountered a very strange issue. I was labelling a series of images using the Image Labeller app of the Computer Vision Toolbox and saved the session for latter processing. When I opened the session in the app again and wanted to export the ground truth object (gTruth.mat), I got the following error:
Error using vision.internal.labeler.validation.checkLabelData
Invalid entry in label data table for Rectangle labelType. Table entries for column 'synapse_rectangles' must be M-by-4 matrices of [x, y, width, height]. Please refer to groundTruth object.
Warning: Error occurred while evaluating listener callback.
This is doubly strange, since I could export the gTruth.mat in previous (but using different images) labelling sessions. Another point that might be of use is that the labelling was done on Windows, whereas I then tried to export the gTruth of Ubuntu 18 (the session was saved into a folder shared between the two systems via Dropbox). The MATLAB version on both OS is 2019b.
I tried updating MATLAB to the latest Update 1 as well as re-installing the Computer Vision Toolbox, without success. Additionally, when I start a new session with making labels from scratch, I can save those without issues (however, I do not wish to relabel the whole image set again).
Any help on the issue would be greatly appreciated. Let me know if any further details are required.
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Thomas Agervig Jensen
Thomas Agervig Jensen 2020-1-22
编辑：Thomas Agervig Jensen 2020-1-22
Got the same problem.
For some wierd reasion it works when you make a new label in the image and remove it again.
This is tho a bad fix when working on a 5 min long video, since you have to do it in every frame.. So the same prob goes for the videolabeler app
sheng
sheng 2020-5-6
I have encounter tha same issue, when dealing with Matlab 2019b
is there any solution for the problem/?
If some one have the answer, would you send me a link through email 380545156@qq.com?

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回答（3 个）

Thomas Agervig Jensen
Gues it is not the correct answer but for you guys working on single images you can fix the problem by creating a new label in the image and deleting it again. Relly hope someone will attendt to this issue to get a real fix.
Harsha Priya Daggubati
Hi,
Did you try reopening the session and export the groundtruth object in Windows itself?
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Harsha Priya Daggubati
Harsha Priya Daggubati 2020-1-29
This issue is fixed in 2019b Update 4. Can you update your Matlab and check.
Thomas Agervig Jensen
Thomas Agervig Jensen 2020-2-4
Sorry for the confusion. I am not the creator of this question. Peter Matthews created this question and i just commented it as i got the same issue on matlab video labeler in ubuntu, i am not working on windows at all.
The update fixed the issue. Thank you very much!!
Hope the creator will attend and accept you answer.

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Ali Osman Gökcan
Ali Osman Gökcan 2022-12-5
Hello. I labeled the video with Matlab2021b using image labeler, saved the session and exported the labels. However, even though I use the same matlab version on my new computer and open my saved labeler session file, I get the following error. Any help would be greatly appreciated, as I don't have time to re-tag. Thanks...
Error using vision.internal.labeler.validation.checkTimes
Number of timestamps in label data is not consistent with the data source.
Warning: Error occurred while evaluating listener callback.

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