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idea I'm going to talk a bit about steps today and which is a project that what basically is about Optical Mark Recognition mostly romance
seen in the case of paper in the back bond that you have which is on the small survey that they're doing here and they're using software which is not free which which actually used by all other universities and throw Germany and what we have and why we started actually steps is that we needed to read out exactly these forms but there universities that CAPS Mr. act nothing below that of the questions on it through just not become market conditions it's only about recognizing which check boxes are marked by the user and then figuring that out and getting all the data from the scans that you've done
however on to a large extent the problem there is 2 of the questionnaire design you want to design a Christian in a way that is easy for the user want to quickly create something like this and you don't want to know I've seen tools where you create somewhere else and then imported then you mark the regions that need to be recognized and I mean that's very but very useful so what is the best does is that it and decrease the questionnaire lasted and all the media that is that is required is exported into files which is then picked up later on and can be analyzed by the program but in general it's a Python program with of just about 10 K lines so is relatively small
role and it's the line in a way that is extensible so that you can create some buttons and commands that build on top of the interim that a model that it has the power and the most it's a command line to achieve their the point where the user interface comes into play place for doing menu error prediction because that's where you need to get to the other so this is the image designed to be scriptable so we started the project back in 2008 actually when in cultural the university was still University of culture at the time today is the constant of technology was it was decided that the evaluation would go go into this in a centralized and we were quite happy with the on by laws that were in place at the time so what we decided at the Faculty of Electrical Engineering is that would boycott the on the evaluation that is at the university now we have an issue because at the same time there was
the change to better master system in Germany going on and really want to use that that was coming in especially for the for the 1st semester's better if there were any changes so we have to actually use really do using that was or is this ourselves what we ended up
doing is that we created tool which red of these forms of another pretty quick hack like over the Christmas holidays and then I intended off but I actually evaluating models of the exponent the cell phone to help out most of the lectures at the Faculty we using our tool and it actually in cooperation with the faculty itself so that went over river real after that we realize that we could create such a tool but obviously on 3 were using these original forms that time so we need a way of also creating the form not only reading again and we 1st
decided to use openoffice for that and later Hebrew office and then you later created a lot of support which is no basically the main part of so since then actively try foreign region so that's to the 1st problem since then people use it for a lot of different things or
even try to use it for different things so this is a
survey that is being used in the UK by by the a company called GP tools and they offer some services there for for doctors who needs to do for that you do yearly evaluation off their office for the NHS and what they offer is is simply a very simple form so the after gives observe to 20 patients or something the day and send it in and they will create a nice support for it is even example report online they basically take the normal but that that still is generates at some more statistics of themselves and that's that it's what they all they're selling the service they're not the thing is examinations so both 78 often the physics department there there looking into using that and they have the 2nd of the worst that are is that is a good point which should thanks for the the entire the examination is a point which is actually quite interesting come to that later on so they are aligned a completely new way of arsenic with the examination this is an example for the tutorial that they were using but there is sufficient for the re-examination and this is an example from Princeton where they have to write to and get it to work and you can actually if you look closely product can see and that stuff is not really designed to handle these cases so what they did here is that there's a lot of all which is just take notice of it as an image and then they play something else inside to be able to get this the doctor out from after the scan and then have a look at the image there this summer I've seen I've ordered think that they also issues that students right outside the field and stuff like that which makes it lot harder to handle that later on and the different layouts Leo issues that they're having their the Japanese is pretty good job trying to half of the class in a way a lot of stuff that you can get the latest word that and working on improving
this this is another example from relational and this is the sheet that was used during the 2 them on to the
14 elections in the in the US and this for the while door to and you go up to the front door to door you ask questions and you just check out the answers there are and they sold the services also to some people but his son organization should I just think that what around but in theory will take had someone doing this belt at some point and achieve their use it I think that the pirates in building have tried to use the for the relatively complicated so voting system because it's a lot it's a pain to current manually that I have not found they don't know whether they're using it other than trying out once just months ago I got the request for
someone wanted to do our part across German artist level or something and there you need to count the terms that are by the and for that you want to take this out they are currently using some axle and then manual things so actually played around trying to do this and this is using some you that is not a and so as you can see there are a lot of different use cases
there so as understand need to think about how how to make it easier for you to use for the user you need to think about the different requirements that you have in some cases you want that security survey you want under miss versus nominal service you might do a patient survey where patient gets the same she's saying questionnaire every month and then on this side of this and you also need to know from which months meant that was later on there's a lot of syntactically states you need to think about logistics if you have not only 1 page of a piece of paper at this 1 it's very simple but consider an examination for example with a huge amount of papers that 4 pages 10 pages that and if you staple it's hard to scan and again because you need to cut off the edges something which might destroy the edge markers that is using on there's a lot of things to think about at that point so that everything runs smoothly and this moves to a large extent not even a software issue but the issue of getting all the division thinking about how to do it for example now the thing is error and especially examinations you need to make sure that the students if they might some piece of paper and that they can correctly great the results and then you can go back and student out exactly what happened and you can correct it manually is that just running through the computer and then you end up with 1 . 2 and a will complain that the markers run you might not even get complaints and then you're in trouble so present holes in general there is a of there's some consideration that we should take think about before the examination or even of the survey on 1 April but at the same time it's nice to start paper paper service make a lot of sense in in some context so
here is found the thing that some some parts of the default best of so what does that does this multi-page handling with the bottom of the bottom corner and if you look closely users
literature choose which is the 2nd page so in the 1st place there's no barcode but on the 2nd page there's a bottle saying which they somebody's is and there is a large city that the random number identifying surveys which is on reproducible so if you use the same lattice input files compiled against it will result in the same number but if you do some minor modifications you will get a new number because the software of the the the word the areas in and around so that means that you are reproducible then you'd get and user-defined pockets so with the example that have for example and sending a survey out patient every month so you need to know which months the piece of paper was from so you can't just at this information to their or another example might be on lectures where you have 10 lectures and you want to know which victories in print on the piece of paper directly to ensure that even if you mix of the papers in any way you want you know afterwards which actually was from for an online in the service you want to be able to mark the paper with a custom barcode that defies the on specific uses can adapt to so that it would come as this provides internally while the the center on its basic human newsletter of result because it's not useful for operators just there for the users should be used later on In general the process it is each
category the questionnaires
after than possible which is the main program which expects all metered out of it but then and you're able to create a printable document afterwards after some processing that and you have is going back then that and obviously you want to hand it over to the main program again to do automatic annotation maybe menu error-correction depending on what you know what his are and obviously that export afterwards on so these steps of this month is the set of the of the stem command which does the printable documents that that command which simply as this can we have recognized command which does the recognition that good user interface that cities export command and some other physicians as original slides that this of report model between India of so the set of commands it simply provides lattice document or it takes the would lead to
file parses it reads in the PDF file extracts fallen From there and offered us all the metered out so it can be compiled document with the correct information were overlaid on the corner marxist of so what happens to them after that but the considering the limited and so of what you want to create a nice budgeting document
and for that we have the largest class this isn't just a simple example and when you compile a
lot of logic is this this is the example of actually so what we
can see here is that applies of this simple document
what we do is we create begin question and question this is just the reckoning of reference environment to be able to repeated so that we can just generate like 100 unique questionnaires with the barcodes from not directly and that is a simple section and single market just mark question with lower bound upper bounds to the here but then you can have a choice question with different choices and symmetric they a table the
means that it has 4 columns and then we have 2 choices that another choice for text input and textbooks as far out skating so if you look at the page here this is the bottom of the page and you can see the end of the textbook because of skills over the course known as 1 of the sons of this 1 the PDF which is kind printed but
on the other hand the and with the exact position on page of all the check boxes and the questions that you were using so that we can create a report of which contains the question texts which contains the information and also do we have the program has all the required to analyze the the people so the next step sometimes depend if you're doing not an
answer every is that we still don't have a printable document is only to add more of our goods which identify the user which identifies the single piece of paper so you when you're are you pass over 2 steps and then you can create reproduce is the Stamp command to create the actual principles finally after that all processing has to be done obviously have the papers you at the stand this can there is right now we need to provide a monochrome TIFF file with beach defined or there are some I've got some which Our means that you can import basically any put to so it actually works I tried that you use had the cell phone camera just taken snapshot with Europe himself in which mobile device and pass it over to the import feature which converts internal to the motivates does the 3 D R transformation everything and then you can also use that but if you're scanning and you don't want use all this overhead than you need to have a scanner which on its own to file 1 equal to 1 and basically at images 6 that is someone from to follow and that the patient saying that copies about over into the project and then the next step is the actual data processing where you run the recognition and it because the image it calculates a correction matrix so what we do
here the it it's it's effects the middle the barcodes are the rotation is done and optical market conditions and have and so if you consider this the foot enough on its but what mention other ways of this but you
do what what happens is that the quantum Martin detector and you can do the the securing of the aged because actually surprising about scanners are and
printers the human life doesn't see it but it's not quite accurate over the over the page they are you know not only get which you get and skis and stuff we we also gives that piece of paper didn't quite to the same speed why scanning of French and so that means that you know that the the check boxes are actually not quite have the free position so what ourselves is that there is an extra correlation there are to use that analyzes the checkbooks area just looking for the bounding box office textbooks or in a circular from the circle and then goes of that after that to analysts at the center of the boxes but there's a couple of others that are implemented it's probably not the best on I'm not
a computer science you guys don't know that
much about art image data processing I guess that you could do a lot better what is that it does is simple bag level check so just because the number of pixels in the area that area so you can see only the areas analyzed the the way consists of having to make sure then see the certain books and then another thing is that what what I've implement is half transformation so but it tries to detect lines and then removes these lines and the idea is that if if the user fills in the box it's supposed to be considered not marked again so far we have lines from the standard and promotion of things like but this probably not filled out the completely which is for that say the other way around the world is less quite a lot of less than it is fully in and so just pick 1 and another thing is that I try to detect continuous white area to be able to find out whether whether it's filled in just lock in the end you get lots of small white area so the coverage is pretty low so it's not really by a single markers on this kind of works on David doesn't with it's not not great but it works mostly so and my experience it's fine enough for most use cases and examination are you probably want to think about how exactly you're doing because they have so much errors and then we have user interfaces for many Americans written GTK and it's simply shows the document the scanned you can it be on the checkbox to toggle and to move
around and that's all there is to
and obviously we have the expertise is needed to yeah the
but with the thing where the report I don't consider it stub to be statistics to are it's nice to have a PDF report for for quick service where you don't really need to be be on to complex statistical stuff so there is some support for statistics and there is some support for report generation but I don't see the point in having much more features to start with the virtually to statistics because if someone is actually more complicated stuff there probably want to explore the doctor anyways and process it further using ah or whatever is the preferred way of doing statistics but you
can for example x for just a subset of dada using filters or just the words so you can do some statistics of this work some analysis pointed out that but so there's filtering support as as the new feature also quite hard to explain explicitly and then have some of the body and mind but that's not the best time was thinking that maybe they should be quite complicated with no so if we
consider this as the example document not that I have on my for the it so it's
just large PDF of that document with lots of questions and and we chose a the different features if my groups you might languages that's condensed original when you have the a choice questions that we already had that which is the number of choices and the resulting documents this is not this the
correct what that is the example of the results so we can use like questions range questions like this 1 here we can mention of into different and so that the more condensed source multiplication at same time the choice questions on I just multiple choice questions but have with the possibility of having free-form views which are on the 1 hand a check box because if something written it's checked on the other hand you can get the image that later on if you want to know that and the same thing for choice questions so this is basically all
it have support but it is
not our foremost use cases and so it's quite
usual so this would be so this is
the example document and I can now to
what know that was just so I
can I do this that and run
around of from the interval which now but that hasn't been much of a difference so we create the test the extremists the project directory that it's all data we run this adaptation command which means that we want to find an input command and it will compile and so what happens now is that as the score was looking at a couple of times then resubmitted it shows that you can calculate the ideas you need to use that as a required and the re runs the whole process again so that the printable documents produced in this case actually in which they have modified in a way that I don't pretend to know let me see but Christians that here now so I want you can see now is that there's no drop you might have seen before that there was a large graph
text on the background so that you will read the book so that right now because none of them is survey we don't identify the users of our 1st here consider because simply this
that I have examples can and
the right into something that that sample
if you any questions feel free to ask just this is an example of nails but the racism the
screen here want to mixed some
between both from so to use
that as an example here you
can see that Government of that that's 1
of the understanding as the size the and
just simply retrieve data from simple
fix the year so far and over
helps which will
simply OK this and want
the test project which is still higher than 1 didn't want them to form and likability and command and that's it as very quick because it simply does want pretty much only called the file and now we do the recognized this 6 levels of all we have the that has analyzed how can have a look at so so that the findings of the
original mature can still
page Mr. tweaks where this
with things correctly that's so here detected the area where is
in and because the waters all of I
think that means that there's text found turned out to which the 1st page this 1 but
would but and so basically no 1 wanted that is left is a nice looking reports the
this although the universe to that of
statistics here and
present but it does that all of the year the context of
free-form text what is images here
that you can read them later on and that is all there is to
and this uses this actually a lot of time and again in this case but there are different ways of doing it in steps so origin so the next 4 this
is actually grew the right now our In this so of there's a selection of ones and
zeros and the ones that start at the top is the shape looks
at the question number included there so 1 1 which what 1 question wanted in checkbooks was something the which what is expected to have more I know that the 1st question is a mark questions so it has this has the integer and the 0 which which of checked so 1 1 is the 1st question is in the 1st section and well use 1 14 anyone what was checked the that's it right any
questions on this probably not wouldn't so found all right
so I was thinking of this as just a little bit but the the that in all hour and so in examinations you have the the definitions what they decided during this making sure that they don't get they don't have to stable the paper and anything by using a 3 fold change so there were limited to 4 4 pages that is not the whole thing in a way that this would be possible and and created some scripts radical thing to use slice of the images correctly after the scan and combining these 4 pages into into printable documents topical and then we all and they also got quite a bit about the error handling and selected for a minute section so this is what the looked like which was used for tutorial I don't have the design of the later ones 1 and you can see that species which is just the check boxes they they asked for the formula they ask for it and the value really the result and then they ask for of what is called don't so this is they just thought put the planet thought into how to of do the questions
how to change the design of any of the examinations so that would
work properly and their views at the beginning of this year and then you
would find them and the 1st and then the error error-correction but the 1st we're trying is
that on they would go back they would have sorry what the 1st right to do so that the that if a student corrected something they were supposed to raise their hand then and it someone would go in and would circle a point where that which where correction was made here and the cross and then down which piece of paper had to be manually circulated on the changes that are around the and then came up with this with this scheme where the students themselves just go ahead and do the correction but they're supposed to know it down of
on a on the 1st page just so that you know that there's something weird there and then you can spec specific going you can filter to just have a look at all the all the ones that where it is possible that the books in the user interface and then use of the go through all the pages and look carefully out but you can skip all the ones that Our findings right from the beginning so you don't even need to look at those and undergo those of students things that there was a mistake and apparently they had to be errors with the whole process to check boxes that were not identified correct overall questions of right then the other thing which was most apparent with the people living with his wife and they tried to do a very specific layouts and at some point I decided this is this no way of going forward with the current latitude so what I'm working on right now and it's been working on this off and on for quite a while it's a complete rewrite of the largest class and I because the current food is really designed only for a very very simple service Antonio preview layout options just basically to question types there the there I don't care about single choice multiple choice which policy which already makes a difference in question designed people expect that a single choice on question is part of around checkbook and multiple choice of things like that because that is what people are ignorant learning from the computers so you really want to to the of these kind of things and it's not designed to do
that well so and there's some other states like he saw this use the export I had the 1 1 1 2 you know what it was about great so what I want is that you can actually change this around later on and on the specified in the lattice what it's called in the expert so that we can that is that so you can do it on I've been experimenting a lot of history which is really to some extent it probably the most of you want to hear about that because all the different missionary of words only relevant but I've separated out different support packages I have a basic package which implements a lot of on the infrastructure I'm actually I'm afraid that I for engineering but but so that you can designed a questionnaire properly you can have sections are which underlines slightly differently you
could override some options locally you could also for examinations if you want to the standard answers for you might want to check some boxes and then printed out he can do things like that you can overlay doctor on top of the textbooks you can I created textbooks around normal logic there isn't so I've done a lot of work there so yeah that's what the support package does is that I context management and so what you could
for example do here is you create context public speaking context then and then you enable PDF form creation and you get this section this inside between between the context commands to get a PDF forms over the form elements already you can actually use it correctly in obliterated things up what would still be needed here to be able to close is the stuff somehow to server something I guess Our and the variable name of prior to find a scheme where you hierarchically can name variables so here section you could give the section variable name them and depend on the score and then get the question and so forth where you can change the shape of the time that you have ways of creating new objects to curative begin the object and which just more internally and and then this is a choice which is going to be written to the meted out of other and so that you have committed solitude and this also means that separating 2 that output from the actually assigned to of which is a problem when you get really special things like let's say graphics as a question so if you think it wasn't it is in the examination day are they had a graph of the graphical it's diagram that's the question basically and and different answers it doesn't make
sense that you can't have a diagram in a metered out in the report doesn't make sense to export so you really want to to be able to override the but by default is the string that you just but I'm also a way of specifying the normal human readable things that graphics the PDF or whatever and this is the overwrites where you can actually a freedom march check boxes that have a specific variable name so that the yeah you could pre-marked them already and to standard examination we also with with features this is an example of him and that well the test of
values so this you can see the blue ones are have different elements can be changed in different ways of forwarding is formed here and this box is simply a box and also all of this basically wants to actually desktops can extract meted out there that can remember that another features that was requested from people I talked to a number of people and those
were thing was Lundell suggested that you if you created Microsoft questions you want more profile layout options so I've tried here and this is a major helped me along with this is that you can actually with some machines 1 flag In the case of change layout entirely and by that you're very flexible with the common questionnaire like because you can focus on what the question is about and don't have to focus about on the right away at this point but I still have to do a lot of work with this because I'm not quite sure this is a matrix here right the table there it and thinking of optimizing things a lot so that tables so if you have 2 tables about each other for example that the columns differently sized are not quite sure what kind of the features and want to support them and it's a lot of work to do unfortunately but but I think it's worth their for them this point that because you want to hear what I wanted section of question is yeah basically it from all other and that so if you're
interested there is an ongoing there's a web site there is is a on the mailing list as you can join were Irish Sea I will talk to yeah basically question then now you 1 of the
all the people all of the so what was yeah there is no 1 in the book of people of the set there I completely erected went on so the question of how much Cervantes is reflecting the question is found pretty important gotten worse no it all the people that a thank you for all the this also the whole of the day so the the question is whether I could ask but that's this new way all the knowing that how many devices if if a user answered questionnaire with the certain answers but what else did these these people answer there and this is actually something that is possible with the filters because you can create a report where only there is only the answers are included that are are our which part are so only the seeds are included with which the questions and you where the answer was done so that's a that's that's a try this out actually should be simpler I hope that in and what we want to want to prediction from all its and then there actually is the user interface so let's say we use this 1 question 1
and see whether the critical system so we this would work with everything is good they're uh OK just summarize and this 1 won't be included and for that it was new so actually
uses that can use the filter in
different his the field here so I could say here our 1 of more on
the whole system is 1 of the good we only have 2 pages and everything else is in way and if
I read a report with I get an environment which is just a mystery here he we just includes
1 question but it's a very
very simple way and if you want anything more advanced you'll
need to do the statistics
yourself well that works and there it was thank you
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Statistik
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Punkt
Indexberechnung
Dichte <Stochastik>
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Generator <Informatik>
Dienst <Informatik>
Verkehrsinformation
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Software Engineering
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Statistik
PASS <Programm>
Vorlesung/Konferenz
Wort <Informatik>
Extrempunkt
Große Vereinheitlichung
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Graph
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Applet
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Computeranimation
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Logarithmus
Wort <Informatik>
Singularität <Mathematik>
Applet
Oval
Extrempunkt
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Metropolitan area network
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ATM
Projektive Ebene
Personal Area Network
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CMM <Software Engineering>
Chi-Quadrat-Verteilung
Große Vereinheitlichung
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Computeranimation
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Extrempunkt
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Verschlingung
Chatten <Kommunikation>
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Kontextbezogenes System
Konfiguration <Informatik>
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Element <Mathematik>
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Eins
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Punkt
Wort <Informatik>
Mathematisierung
Varianz
Profil <Aerodynamik>
Vorzeichen <Mathematik>
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Computeranimation
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Metropolitan area network
Virtuelle Maschine
Task
Code
Bitfehlerhäufigkeit
Fahne <Mathematik>
Garbentheorie
E-Mail
Informationssystem
Tabelle <Informatik>
Filter <Stochastik>
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Applet
Physikalisches System
Extrempunkt
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Portscanner
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Quader
Uniforme Struktur
Prognoseverfahren
Bitfehlerhäufigkeit
Mereologie
Skript <Programm>
Verkehrsinformation
SIMA-Dialogverfahren
Server
Gruppe <Mathematik>
Division
Fächer <Mathematik>
Applet
Physikalisches System
Aliasing
Extrempunkt
Systemaufruf
Computeranimation
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Total <Mathematik>
Programmierumgebung
Große Vereinheitlichung
Verkehrsinformation
Gammafunktion
Informationssystem
Offene Menge
Metropolitan area network
Freeware
Software
Explosion <Stochastik>
Statistik
Fächer <Mathematik>
Machsches Prinzip
Extrempunkt
Menge
Computeranimation

Metadaten

Formale Metadaten

Titel SDAPS
Serientitel FrOSCon 2015
Teil 60
Anzahl der Teile 80
Autor Berg, Benjamin
Lizenz CC-Namensnennung 3.0 Unported:
Sie dürfen das Werk bzw. den Inhalt zu jedem legalen Zweck nutzen, verändern und in unveränderter oder veränderter Form vervielfältigen, verbreiten und öffentlich zugänglich machen, sofern Sie den Namen des Autors/Rechteinhabers in der von ihm festgelegten Weise nennen.
DOI 10.5446/19553
Herausgeber Free and Open Source software Conference (FrOSCon) e.V.
Erscheinungsjahr 2015
Sprache Englisch

Inhaltliche Metadaten

Fachgebiet Informatik
Abstract This talk will give an introduction into SDAPS how it works and how it can be used automate surveys or even examinations on paper. In the core SDAPS is an optical mark recognition software that is integrated with LaTeX and LibreOffice. It provides all the utilities to automate simple surveys, including questionnaire creation, manual error correction, and a simple report generation module. Also important is its flexibility to be used for data acquisition by either exporting the data or even interfacing with SDAPS python API directly for specialized applications. Benjamin Berg

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