What is an algorithm to do this binary image segmantation task?

What I need to do is go from a binary image like this:

to a segmented structure like this:

because I have a program that operates on those separated line contours after.
As you see, those contours are not perfect, they might be slightly bent but where they meet it’s always pretty much orthogonal, there are no 45 degree lines. The lines are between 3 and 20 pixels wide. The whole image is sometimes slightly rotated (less that 10 degrees) but if you find a solution that only works without rotation I could look into de-rotating stuff before. The inserted gap may be of any width (preferably 1px or 2px) as long as it entirely separates one line from another.

I thought one could do something like on page 15 of this paper (the description of what they do is on page 13). Essentially this would come down to finding one marker per line segment and then watershed, but I have no idea how to find that marker.

Just to be clear:

On any point of line intersection, this

is good, as well as this:

If easier to achieve,

this:

is acceptable too, although not preferred.

What’s not ok is this:

This is not only true for three-line t-sections but also two-line corner connections (= it doesn’t matter which of the two lines meeting gets shortened).

Sorry for the huge pictures, didn’t know how to prevent them from turning out this big.

I am working with python and cv2 so it would be a plus if you use that. On the other hand, even a link to a re-implementable algorithm or an idea how to find markers would be fine. Also, I’m looking for a fast and easy algorithm that works on binary (0 or 255) images, not any crazy machine-learning stuff (if avoidable). I have really time but lack the right idea. Thanks in advance.

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SharePoint Workflow Start task process assigned to Distribution List

I created a SharePoint workflow and used the start task process. I assigned the task to an Outlook distribution list (DL). I selected "assign a task to each member within groups". The workflow runs, but it only assigns tasks to two of the four people on the DL. Any idea what is going wrong?

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lock – this task is currently locked by a running workflow and cannot be edited. sharepoint 2013

I have faced this issue my self. When it has happened to me it was caused by a secondary workflow running on the task list.

The Root of the Issue

For instance if you have a secondary workflow (say to set the due dates, or send emails) automatically running on the task list when a task is created, that can cause the locked by another workflow error. Then if you try and complete the task before it unlocks the task it will be locked forever. From my experience even after the workflow running on the task says it is completed, the service the checks and unlocks the task may not have run yet.

You can check that the task is unlocked by going to the workflow history (or the task list associated) of the primary workflow/task, and check if the locked task says “Not Started” or “In Progress” under status. If it is “Not started” that means the task is locked still and you will get that error.

Possible Solutions

The only real solution I have found has been to no use a secondary workflow, or wait until the task becomes unlocked (which sometimes takes extremely long times depending on how bogged down the task service is).

Task Item added event receiver does not fire when item is added by Nintex workflow SharePoint 2016

I am trying to add an event receiver on the workflow task – list Item Added event, to get the Task ID and update it on another SharePoint List.

This is because once I add an Assign Flexi Task action on the Nintex workflow, there is no way to get the created task ID in the workflow, unless someone actions on the task.

However, the Event Receiver on the Workflow Task list Item Added event does not fire!?

Can someone help me in solving this? or any alternative solution please.enter image description here

enter image description here

0xC0000142 Errors from Tasks in Windows Task Scheduler

I previously had many C++ .exe programs (developed with C++ Builder XE7) running as scheduled tasks in a Windows 2008 R2 Datacenter server. These tasks were being run by the SYSTEM account and I never had any issues with them before.

I recently imported these tasks to a new Windows 2019 Datacenter server and set these tasks up in the Task Scheduler. The same SYSTEM account is being used to run the tasks, but with the updated Windows Server, these tasks now give me a run result of 0xC0000142.

Most of the resources I found online say to increase the desktop heap size in the registry editor – I have done this multiple times and restarted the server after each increase, but I was still getting the same results with this method so I reset the desktop heap size back to the original value.

I also thought it had to do with missing C++ redistributables – the new server only had redistributables from 2015-2019, while the 2008 R2 server had these along with redistributables from 2013 and 2008. So I installed these extra redistributables but I still got the same result.

I have tried manually recreating the tasks, I tried running the tasks with different domain admin accounts, also played around with the “run only when user is logged in/run whether user is logged in or not” setting. All of these led to the same 0xC0000142 error.

Also, there were no errors being shown in Windows Task Scheduler history or in the Event Viewer.

I tried monitoring the task with Process Monitor, below is a snippet of the log output leading up to the exit code. I know that error code 0xC0000142 is STATUS_DLL_INIT_FAILED. Right before the failure, tzres.dll.mui and tzres.dll are the last files accessed. There are no failure messages with these files other than the FILE LOCKED WITH ONLY READERS – I believe this is for read-only access, but these files are also read-only access on the old server where the tasks are working…

Process Monitor logs

Any extra tips/guidance would be much appreciated!

sharepoint online – Assigned To Field not populating in Sync’d MPP Task list

I have successfully sync’d a MS Project Pro (MPP) file with a SharePoint Task list. However, the Resource Names located in the MPP file which are supposed to map to the Assigned To field in the SharePoint Task list are not coming across. This field contains multiple user names in it for a given item.

I checked the Resources View in the sync’d MPP file and ensured the users email was there and when I did that a little box showed up to the left of the user name in the Resource view. But for some reason the list of names are not populating in the Assigned To field in SharePoint.

Any suggestions?

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