Saving Pattern matching information to an array
I am using imaqLearnPattern function to create a template image. According the IMAQ documentation, the pattern matching information is "appended" to the image. But when I try to call the imaqImageToArray function on this template image, it does not give me any pattern matching information. Is there any way, that I can save the template data into an array? I do not want to use the imaqWriteVisionFile function because I want the data in an array format and not saved in a file.
Thanks.
Normally you cannot save this information without this function. This information saved in *.png file. This format have a possibilities for saving "user data", and this fact used by IMAQ Vision. Theoretically you can extract this information from *.png into array (format of png is a well known format), but what can you do with this information afterwards? You cannot load this information separately without IMAQ Read Image and Vision Info.vi, because (pretty sure) this function allocated memory for Vision Info before loading, but you not able to do this. You can make this only if you know internal representation of IMAQ image in memory. How organized common parameters, such as width, height, pixel pointer, resolution, linewidth - not very complicated (IMAQ Image -
a cluster of string and pointer to appropriate structure), but where placed vision info - not very easy.
Better, fastest and easyest way - to use IMAQ Write Image and Vision Info.vi.
with best regards
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Attachments:
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I modified the attched program such that it would index the arrays of match information returned and then unbundle the X and Y features of the match and add them to gether as an example of how to access the data programatically.
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Hi,
I have created a program from where you can look at a live video (contious aquisition within a loop) and from that, create a template which you then use pattern match on. The idea is to be able to track movements of the template (in my case components on a PCB) in the live video. Everything works just fine, however, when I try to change the template in the program (I have a button in the GUI where you can either create a new template or load a previously saved template), the program for some reason still uses the "old" template. I'm not succeeding to change the template used in the pattern match part of the vision assistant express vi while I'm running the program.
If I stopp and restart the program I can load a new template however.
I'm beginning to think it has something with the image aqusition and not disposing images correctly, to do but I could need some help.
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Thanks!Thanks Sasi,
I looked at the example but it not really what I looked for. In your example, the match is done on a previously recorded video file. What I would like to do is to do the matching on a live video.
I've managed to do matchpattern the first time I load or create a searchpattern. But if I want to change the match pattern template while running the VI, it continues to use the old one...(I'm aware I have trouble explaing the problem...)
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while (not stopped or stop aquisition of images)
1. Continously aquire images
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3. Do a pattern match (use vision assistant to do a pattern match on the image aquired in step 1, with the template from step 2.
4. Overlay the match (if found) to the image aquired from step 1.
5. Calculate the radial movement between two following frames (the calibrated matches array from vision assistant in step 3.
6. Save radial movement to file
end
It works, but I have to restart the VI before I can use a new template (otherwise it just keeps showing the first match)
I guess it has something with how I aquire images, to do?
Best regards,
//Jonas -
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I'm still a newbie in using LabVIEW so pardon me if I can't understand fully
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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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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
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Attachments:
Determine Pattern type.zip 13 KB -
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I also modified your VI a bit, but didn't test it. I created an Array of clusters, each elment containing the template path along with the respective text.
Please note that this is just a hint!
Christian
Attachments:
suggestion.vi 146 KB
Overlay_Txt.vi 24 KB -
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Thanksuser2544469 wrote:
Thanks a lot Frank. This query worked wonderful for the test data I have provided however I have some concerns:
- query doesnot include the column BOOK which is a mandatory check.Sorry, that was my mistake. It was a very easy mistake to make, since you posted sample data where it didn't matter. Instead of doing a cross-join between vn and got_must_have_cnt, do an inner join, using book. That means book will have to be in got_must_have_cnt, and all the sub-queries from which it descends. Look for comments that say "March 22".
If you want to treat '+' in test_cat.codes as '*', then the simplest thing is probably just to use REPLACE, so that when the table has '+', you use '*' instead.
WITH got_token_cnt AS
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, REPLACE (codes, '+', '*') AS codes -- If desired. Changed March 22
, LENGTH (codes) - LENGTH ( TRANSLATE ( codes
, 'x*+-'
, 'x'
) AS token_cnt
FROM test_cat
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SELECT LEVEL AS n
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FROM got_token_cnt
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, '[*+-]'
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, mh.must_have_cnt
, vn.vn_no
HAVING COUNT (CASE WHEN gt.token_type = '*' THEN 1 END) = mh.must_have_cnt
AND COUNT (CASE WHEN gt.token_type = '-' THEN 1 END) = 0
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HOW TO: Post a SQL statement tuning request - template posting
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Edited by: Frank Kulash on Mar 22, 2011 12:04 PM -
SLOW pattern matching in VB, FAST in VisionBuilder?????
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Even though I can't use
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Any Ideas? Thanks
Attachments:
bw.tif 301 KB
test_patt.png 57 KBI am not familiar with the VB commands you want to use since I use LabVIEW. However, I think you might be using the wrong function. It sounds like the example you tried to modify uses correlation, which is different from pattern matching. As you have seen, pattern matching is much faster and gives better results.
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Bruce Ammons
Ammons Engineering
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