Geometric Matching Advanced (Feature Based) in .NI Vision for NET?

NI Vision Development Module (2013) has advanced
VIs for multiple geometric template (feature based) learning and matching.
These are:
- IMAQ Read Multiple Geometric Template VI
- IMAQ Learn Multiple Geometric Patterns VI
- IMAQ Match Multiple Geometric Patterns VI
- IMAQ Dispose Multiple Geometric Template VI
- IMAQ Write Multiple Geometric Template VI
Is there any equivalent function/methods in NI Vision for .NET? I can't find anything.
Regards,
Dairu

Hi Rahul,
First, thank you for your answer. I have already checked all these documents. I'm sure that there is no feature (multiple geometric template learning and matching) in .NET like LabVIEW.
I'm surprised that you do not know this as an NI Application Engineer. There is a lot of function in NI Vision for LabVIEW that .NI Vision for NET has not yet. Multiple geometric template learning and matching is one of them. As a paying customer makes me this very angry. Does anybody at NI know when will NI Vision for .NET a real product?

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NI Vision Geometric Matching not working reliably, need help

Good afternoon,
I am having issues with NI Vision Geometric Matching, where 9/10 times in my machine inspection application the template would be easily detected and 1/10 it would not be detected no matter what I change the edge threshold (for the detector) to, I have it set to 20 now, when the default is 75 or the matching score (my score set to 200, where the defult is 700). Nothing works for those 1/10 attempts. The template I'm matching is taken from an image the same exact element I'm trying to detect. The element is not occluded or scaled in any way, the lighting has not been changed, and the only differences are minimal <50 pixels changes in XY position and <30 deg changes in rotation. I have the matching settings set to 0-360 rotation and I have the search area set to full resolution of camera. The template is 1172x1134 pixels. The camera resolution is 2592x1944. I have tried taking the template and the inspection images in sharp focus and slightly out of focus to prevent features from being generated on the texture of the element I'm inspecting. Neither has helped. This seems to be an internal problem with NI Vision detector routines, I have absolutely no outside variables and no changes in light, scale, height, and focus, and I have seen SIFT algorithms work extremely well in completely bad conditions. Did anybody else have any of these issues? If I was to write a feature detector routine, I would have included an option for the detector to take the best possible guess if no exact match was found and report the score back to user, and let the user decide whether to use the result. Can something like this be done with Geometric Matching?
Unfortunately I can't post any code or images due to project restrictions,
Versions Labview 2011 SP1, NI Vision 2011, Vision Assistant 2011 SP1
Thanks,

SOLUTION::
I found the source of the problem to be an inability of NI Vision to process geometric detection of large templates, (mine was 1000x1000 pixels from 2500x1900 camera resolution image).
This is probably due to a memory overflow or reached limit in feature count. My PC is a 32bit Windows 7 platform and has 3.5gB ram, this can perhaps be what causing the limitation. However, it could also be that the number of features in my image/template approached an internal limit within NI Vision.
My solution was
Including an IMAQ-Resample node with bilinear interpolation positioned right after the IMAQdx Snap. This effectively shrinks the captured image to a smaller resolution without cropping (mine was 1024x768). I also had to include that same node in Vision assistant before Geometric Matching in order to re-generate a new Pattern for 1 to 1 scale. Immediately the geometric detection began working 100% of the time.
Prior to this I ran a lot of tests and determined that the rotation of the actual part being inspected was the cause of misdetection. When the part was in certain orientation (I would like to say 95% of the time it was detected it was in 45 degree increments from 0 to 360 degrees, but 5% of the time it was detected at other rotations) the reported score was around 900, whereas my minimum detection score was set to 300. In any other orientation the match simply would not be found. I would like to post all my results, but again I can't because of privacy issues.
NI Vision programmers: I understand that memory allocation and data types for feature detection and recognition must be kept as small as possible in order for Geometric Matching to work as fast as it does, so perhaps attempting to match a 1000x1000 pattern is too much, even if machine process time allows for it. But unfortunately, no error was reported to me from Geometric Matching. It would be good to include some overflow error if this does occur.
Thank you,

Vision builder ai3.0 Geometri Matchingについて

投稿する場所を間違えたので再投稿します。
マシンビジョンのサンプルをＶＢＡＩ３．０のGeometric Matching関数を使用してテストしているのですが満足のいく結果が得られません。
最新版のＶＢＡＩではGeometric Matching関数は改善されていますか？
ちなみに
テーブル上にばらまかれている、ボルトの数を数えると言うアプリーケーションです。
固体同士が切り離されている時は、問題ないがくっついている時は結果が良くないです。
LV8.2のGeometric Matching Example.viのワークがボルトに替わった感じのアプリケーションです。
解決済！
解決策の投稿を見る。

xyzz　様
平素よりNI製品をご利用いただきまして誠にありがとうございます。
日本ナショナルインスツルメンツ技術部の浦川と申します。
VBAIは内部的にLabVIEWのVISION関数を使用する時と同じでDLLをたたいて動作しております。
よって、元のDLLが変わらない限り、VBAIのアップグレードを行ってもGeometric Matchingは改善されないかと思います。
可能性としてGeometric Matchingの設定により検出される結果がご希望とは異なる動作をしていると考えられます。
サンプルのGeometric Matching Example.viは正常に動作しておりますでしょうか。
現在のGeometric Matchingの設定はどのようになっておりますでしょうか。
例えばボルトが回転しているのであればRotationを有効にし、360度に設定します。
またカメラのアングルから多少ボルトのサイズが異なるように見えるのであれば、Scaleを有効にし、スケールのサイズを指定します。
他にScoreの値を落としてお試しいただく方法もございます。
Scoreが高すぎるため、検出されないこともございます。
最後に検出される個数がボルトの数の分だけ指定されているかご確認ください。
以上の内容で改善されない場合は
もしよろしければ、具体的にどういった現象が起こっているか教えていただけますでしょうか。
大変お手数ですが、宜しくお願い致します。
浦川
日本ナショナルインスツルメンツ技術部
添付:
geometric matching.JPG ‏105 KB

Ni vision - geometric matching

hi,
i am a beginner and i don't know what i'm doing wrong. i have a template (marker200_tmp.png) and would like to search for it in a picture (marker_3_pike_500_gross.jpg). when i use the vision assistent and search with the geometric matching tool, i don't get appropriate matches. i changed the curve parameters and so on, but nothing led to a good result.
can anyone help me?
thanks
Attachments:
marker200_tmp.png ‏1616 KB
marker_3_pike_500_gross.jpg ‏122 KB

hi stephan,
i attached the simple code which i use for testing, i use version 2012 of the vision assistent.
when i use it with my old webcam (low resolution) it works, with images from the pike camera (http://www.adept.net.au/cameras/avt/pdf/PIKE_F_100B_C.pdf) the code finds some results when i change the parameters, but not the right one.
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marker_test_pike.vascr ‏2 KB

Geometric matching: Difference between score and correlation score

Hi All,
What is difference between score and correlation score in geometric matching???
Solved!
Go to Solution.

Hello,
the correlation score is based on pixel intensities where as the score of the geometric match considers also the geometry features. See the NI Vision Concepts (Geometric matching -> In-depth discussion).
Hope this helps.
Best regards,
K
https://decibel.ni.com/content/blogs/kl3m3n
"Kudos: Users may give one another Kudos on the forums for posts that they found particularly helpful or insightful."

How can I read a template and differentiate if it is a pattern matching template or a geometric matching template?

Hey all,
I would like to know how can I read a template´s information to know if it is a pattern macthing or a geometric matching template?
In my code, users provide templates and the algorithm must match them using pattern matching or geometric matching depending on the template.
At the moment I am doing it by including a P or a G in the name of the file, but I would like to avoid this and read the information from the file.
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Thanks in advance,
Esteban
Solved!
Go to Solution.

Hey Esteban,
you can use the VI "IMAQ Is Vision Info Present 2 VI" to reice the information:
IMAQ Is Vision Info Present 2 VI - NI Vision 2011 for LabVIEW Help - National Instruments
http://zone.ni.com/reference/en-XX/help/370281P-01/imaqvision/imaq_is_vision_info_present_2/
Take a look at the attached VI
Stephan
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Determine Pattern type.zip ‏13 KB

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How could i draw the exact profile that the geometric matching vi sees?

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Geometric Matching Advanced (Feature Based) in .NI Vision for NET?

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