How reliable the pattern matching is?

Hi, if using pattern matching to identify different people by using the eyes section as the matching template. How reliable it would be?
Thanks.

Hi, I'm building a security system which can identify a registered person and non-registered person. A registered person has his/her eyes section image saved as a template image. I'd like to know the percentage that this system can work if i set up the " Minium Match Score" as 900.
Thank you.

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Is there a way to turn the pattern matching example in Labview to instead of loading a rectangle around what you want the template to be you can use an image display , I've be trying and can get no where with it

What I want to do is , have two images on image displays and the pass them through the same setup as the pattern matching example to get the number of matches , I have attached what I have done and also given the pattern matching example program as well.
Hope to get answers back soon,
Thanks Alan
Attachments:
screenshot.docx ‏48 KB
Pattern Matching Example.vi ‏100 KB

Hi there!
The example used can be adapted for comparing two images, however the algorithm and coding for finding the differences is more specific to your actual problem. In terms of the loading and displaying of the images, this can be done in the same way.
Once you have some sort of algorithm, then you can automate the learning and matching by simply wiring them in order. (in the example, these are put in case structures as they are waiting on response from the front panel)
I hope that this helps,
Liam A.
National Instruments
Applications Engineer

How will the itunes match app affect my data usage?

how will the itunes match app affect my data usage? It seems to take a while to connect and start playing so i'm assuming if my range isnt the best it will drop out like a bad radio station???

What I have done is create playlists and I'll download the playlists to the iPhone while I'm at home, on Wi Fi, and listen while I'm out and about. I've only downloaded the occasional tracks on 3G (mainly because at&t's network was so terrible). This method worked pretty well for me.
Incidentally, iTunes Match should not be used as a substitute for a backup: FAQ: Why iTunes Match can NOT be used as a backup!

How to implement pattern matching in RFC input paramenter?

Dear Friend.......
I have a requirment for implement a pattern match for name field of vendor in one of RFC.........
For ex..........
Name field:- A* -> give all list of name starting with a.
how can we implement this?
Any way............Suggest me
Regards
Ricky

Hi,
I am not using any ABAP program for calling this RFC,I am using Webdynpro for this one.
so how it possible to implemnet same things at there.
Regards
ricky

How stays the iTunes Match limit (25000 songs) after exclude songs?

Hello,
Somebody knows if after exclude musics from iCloud which was matched by the iTunes Match, the limit of 25000 songs is replaced in proportion of the exclude ones, or stays the same?

In this case, I have over 25k songs and some of the songs that exceeded the limit - and therefore were outside the iCloud - are better than some that were made available by iTunes Match in iCloud.
So I'm thinking of deleting some of these songs in my library (only in iTunes library), and iCloud respectively, to release limit for load that best songs that were left out on the first time at iTunes Match scan my library.
The question is: by doing so, my library back to be below the limit, or once reached the 25k, there's no going back, even deleting songs from iCloud?
thanks for the reply
[]s

HT204146 How does the Itunes Match works in family sharing

If i subscribe for itunes match the rest of the family member in family sharing get also the suscription even without sharing the songs?

HI,
Family sharing does not work for iTunes match. Which purchased content can I share using Family Sharing - Apple Support
Jim

How do I set multiple pattern matching Vi's and make overlapping pattern matches to count as one?

Hello! I'm a student and I'm currently making a project using pattern matching.
My patterns are from chick foot/feet.
I'm created multiple pattern matching VI's to detect all the feet because I find it difficult/impossible to match all the feet with a single pattern/template.
However, when using multiple pattern matching VI's some pattern matches detect the same foot, hence overlapping.
So how can I make the overlaping pattern matches to be counted as one?
Thank you in advance

Thank you for replying Sir Zwired1.
I'm still a newbie in using LabVIEW so pardon me if I can't understand fully
The objective of my project is to detect all the feet through pattern matching and count the pattern matches made.
"Keep a 2D array of counts, initialized to zero and the same size as your array of possible locations, and increment the value every time you get a match. If multiple pattern matching attempts result in a match a given location in your count array might be "3" but all you care about is if the number is greater than zero."
I'm sorry, but how do you do this? BTW, I'm using vision assistant.

I want to write onto port 3 based(using a buffer) on a pattern match trigger from port 2. How can I code this?

I have to check for a pattern match from port 2 and based on this trigger I have to write onto port 3(buffered) as fast as possible. So there needs to be a buffered O/P from port 3. How to code such that the pattern match trigger from port 2 triggers the trigger config.vi for port 3?

Bheem,
Unfortunately, you can not share the start trigger with another operation when using the pattern match operation as a trigger. The only way to share a start trigger is if you are triggering on the rising or falling edge of a digital signal. This is a limitation of using the pattern match operation as a start trigger.
Regards,
Todd D.
NI Applications Engineer

RegEx: How to find out which part of the pattern failed?

Hi there,
I was wondering: is there any way to find out where the pattern matching failed?
Say I got the string "John Paul Yoko Ringo", and I want to match it against the pattern /John Paul George Ringo/.
I would like to know something like "pattern failed at index 11", or if I had groups something like "matching group 3 failed".
Is there any way to do this? Thanks in advance!
Best regards,
- Torben

jschell wrote:
I would like to know something like "pattern failed at index 11", or if I had groups something like "matching group 3 failed".
Is there any way to do this? Thanks in advance!
I wonder if that is reasonable. It means that the parse tree for the regex would need to keep mapping information.
At a minimum it is going to require an array, not a single result, because a regex can 'fail' in many ways.
Consider the following regex with the following input
/(a|b)d/
abababababx
Where does it 'fail'?Right. If you just want the character position at which it failed, those tools might tell you that as part of a bigger picture. But by itself, without any context, that number's not necessarily meaingful. A given character can be examined many times due to backtracking. Part of the expression could succeed for part of the input, then the expression might fail for the rest, so we backtrack, and may get several more failures, then more partial successes, all at different points, then ultimately it may fail anywhere within the input.
So just knowing where isn't enough. You need to know what steps were taken to get there. I do think these tools provide that, though I haven't looked closely.

Is it pattern matching the best way to check presence and orientation of components on a pcb board?

Hi, like i ask on the title i need some hint about this. I need to program a simple AOI machine that must inspect a pcb board and find if all the components are correctly placed and oriented. I though to use the pattern matching with a good template of the object to inspect. Can it work?
All kinds of tips that may come to your mind please tell me, because this is the first time i try a task like this. I already have some experience in image manipulation but not in AOI machines.
Francesco.

Hi Francesco,
you can find some useful information here, here and here.
I hope this will help!
Bye,
Licia

Need to know the best method for pattern matching

Hi,
I need a best a way to do the pattern matching with better performance
for the following requirement.
i need to search for a set of records as per the following requirements.
1. The input string will be split into tokens with space as delimiter
so if the user enters the text 'severe head ache',the tokens formed will be
severe
head
ache
2. The terms which contain exact match of the tokens formed should be fetched from the database
(i.e)
i. the token should appear in the term as such and no alpha-numeric character should be appended to it but a single space or any single non alpha-numeric characer is allowed
ii. the token may occur anywhere in the string.(like start, end, middle etc.)
iii. the term should contain all the tokens
For ex. the following terms will be fetched for the above input
1. patient has severe head ache
2. severe, head ache are present
3. leg pain "severe" #head pain
4. pain, severe in head, leg
But following terms should not be fetched
1. severe leg pain - (it does not have the token 'head')
2. headache severe and leg pain - (head is a part of the word headache)
3. head67 severe pain - (head is a part of the word head67)
Thanks

How about Oracle Text? There's even a Text dedicated on this topic here.
C.

How do I find out how IMAQ pattern match works inside?

I need detailed info on the internal workings of the IMAQ pattern match vis (L7.1).
I don't need source code as such (although that would be cool). I just
need a desription of the algortihm. The manual is not detailed enough.
I need to be able to explain my program rigourously for a scientific
paper so I have to find this out. Any help much appreciated..

Hello
If you want more information about the pattern matching algorithms, look at the IMAQ Vision Concepts Manual which can be found at the link below.
http://digital.ni.com/manuals.nsf/websearch/49110D7DB7FD282E86256EE70014816F
If you look at Chapter 12 this discusses the way in which the pattern matching is performed. This is probably the most detailed information we will be able to give out to you. Let me know if this isn't what you need and I'll see what I can find.
Regards
Hannah
NIUK & Ireland

How reliable is the ipod nano's?

I am currently a disgruntled Zune 30 user. I have to send my player into Microsoft for them to fix it. I'll be without my Zune for 15 days and it's going to kill me. I am not here to start a Zune vs. Ipod discussion. I only want to know how reliable the ipod nano is. I am looking at purchasing the 8GB. I really don't want to have to go through this with the ipod if I decide to purchase one.
Are they pretty reliable? What happens if something does happen to them? How long does it take for them to get it back to you?

I've had my 3rd gen Nano since they came out (9/07). I use it for running and have never had a problem with it. I've had iPods since the first 5 gig iPod (yes, children, full sized iPods used to be 5 gigs). My 60 gig iPod Photo is having some problems according to the person I passed it on to. All of the others, including the original are still working (okay, the hold button on my 5th gen doesn't work but that's because I dropped it onto a tile floor from a height of 3 feet). I did have to send one iPod in (forget which one) for a bad headset jack. Turn around time (my hand to Apple back to my hand) was 5 business days. I remember because I was amazed. As my iPod was over 6 months old and I didn't have Applecare, I had to pay $29.99 for shipping.
Your mileage may vary. You could get a lemon. It happens with any manufactured product. That's what warranties are for. My experience has been positive.
Best of luck.

How reliable is the iPad?

Just wondering how reliable the iPad is

How reliable is it in terms of the system and the software? Does it crash easily? Does software always work?
It's difficult because I don't know what to compare it to, but in general:
very
no
yes
The last depends on the software, but everything available for iOS has to be approved by Apple, who subject it to many stringent quality control tests before it is released for sale. Poorly written software or apps that are not a good value get poor reviews, so look for yourself before purchasing.
My iPads have exceeded my expectations. I have never experienced a crash or anything resembling instability. For such a versatile product, I can't believe they price them so inexpensively.
Don't drop them. If you must drop one don't let it fall onto anything harder than a carpet.

Use of edge detection in pattern matching algorithm?

Hello all,
I work for a group at Texas A&M University researching two-phase flow in reactors. We have been using IMAQ Vision and had a question regarding the use of edge detection in the pattern matching algorithm. I had seen the webcast entitled “Algorithms that Learn: The Sum and Substance of Pattern Matching and OCR” (http://zone.ni.com/wv/app/doc/p/id/wv-705) and in the webcast it was mentioned that the pattern matching algorithm uses edge detection to, (as best I can tell), reduce the candidate list further and to perform subpixel location calculations. However, I was wondering if this edge detection process is still performed if we do not use the subpixel location calculation (i.e. if we uncheck the “Subpixel Accuracy” check box)? Also, if edge detection is performed in the pattern matching algorithm is it consistent with the method described in Chapter 13 of the Vison Concepts Manual (“Geometric Matching”)? Finally, if edge detection is performed in a manner consistent with Chapter 13 of the manual, how does the geometric matching correlation number affect the correlation calculation that was performed in the previous steps? Are they simply multiplied together?
Many thanks!
-Aaron

Jeff,
We are using Imaq Vision Builder 4, with the included pattern matching that can be accessed via the menus (i.e. we haven't created a custom VI or anything.) We are using the software to locate bubbles during boiling experiments and want a deeper understanding of what is going on "behind the scenes" of the algorithm, as we may have to explain how it works later. We have been able to determine most of what we need from the webcast I had previously mentioned, except for the use of edge detection in the pattern matching algorithm.
At the scales involved in our experiments, subpixel accuracy is really not needed and therefore we do not use it. If edge detection is used in the pattern matching algorithm only to determine location with subpixel accuracy, then we do not really need to know how it works because we do not use that calculation. Inversely, of course, if edge detection is used during pattern matching even without enabling subpixel accuracy, then we would like to have a fairly good understanding of the process.
I've read most of the section on geometric matching in the Vision Concepts Manual and wondered if the process described there for edge detection (or feature matching) was also used in the basic pattern matching algorithm?
To summarize, if edge detection is not used in the basic pattern matching algorithm without subpixel accuracy, then that is all I need to know. If edge detection is used for pattern matching even without using the subpixel accuracy calculation, then we would like to learn more about how exactly it is used in the pattern matching algorithm.
We would really appreciate any help you could give us... we've been digging around on the NI website for a couple of weeks now trying to fit together all the pieces of the pattern matching puzzle.
Many thanks!
Aaron

How reliable the pattern matching is?

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