Profile Performance in LabVIEWvs Performance meter in Vision Assistant: Doesn't match

Question

Hi everyone,
I faced a strange problem about performance timing between these two measurements.
Here is my test
-used inbuilt example provided by labview in vision assistant-Bracket example-Uses two pattern matches, one edge detection algorithm and two calipers(one for calculating midpoint and other for finding angle between three points.
-When i ran the script provided by NI for the same in vision assistnat it took average inspection time of 12.45ms(even this also varies from 12-13ms:my guess is this little variation might be due to my cpu/processing load).
-Then i converted the script to vi and i used profile performance in labview and surprisingly it is showing way more than expected like almost ~300ms(In the beginning thought it is beacuse of all rotated search etc..but none of them make sense to me here).
Now my questions are
-Are the algorithms used in both tools are same? (I thought they are same)
-IMAQ read image and vision info is taking more than 100ms in labview, which doesn't count for vision assistant. why?( thought the template image might be loaded to cache am i right?)
-What about IMAQ read file(doesn't count for vision assistant?? In labview it takes around 15ms)
-Same for pattern match in vision assitant it takes around 3ms(this is also not consistant) in labview it takes almost 3times (around 15ms)
-Is this bug or am i missing somethings or this is how it is expected?
Please find attachments below.
-Vision Assistant-v12-Build 20120605072143
-Labview-12.0f3
Thanks
uday,
Please Mark the solution as accepted if your problem is solved and help author by clicking on kudoes
Certified LabVIEW Associate Developer (CLAD) Using LV13
Attachments:
Performance_test.zip ‏546 KB

Answer 1

Hmm Bruce, Thanks again for reply.
-When i first read your reply, i was ok. But after reading it multiple times, i came to know that you didn't check my code and explanation first.
-I have added code and screenshot of Profile in both VA and LabVIEW.
In both Vision Assistant and Labview
-I am loading image only once.
Accounted in Labview but not in VA, because it is already in cache, But time to put the image into cache?
I do understand that, when we are capturing the image live from camera things are completely different.
-Loading template image multiple times??
This is where i was very much confused. Beacuase i didn't even think of it. I am well aware of that task.
-Run Setup Match Pattern once?
Sorry, so far i haven't seen any example which does pattern match for multiple images has Setup Match Pattern everytime. But it is negligible time i wouldn't mind.
-Loading images for processing and loading diffferent template for each image?
You are completely mistaken here and i don't see that how it is related to my specific question.
Briefly explaining you again
-I open an image both in LabVIEW and VA.
-Create two pattern match steps. and Calipers(Negligible)
-The pattern match step in VA shows me longest time of 4.65 ms where as IMAQ Match pattern showed me 15.6 ms.
-I am convinced about IMAQ Read and vision info timing, because it will account only in the initial phase when running for multiple image inspection.
But i am running for only once, then Vision assistant should show that time also isn't it?
-I do understand that, Labview has lot more features on paralell execution and many things than Vision Assistant.
-Yeah that time about 100ms to 10ms i completely agree. I take Vision Assistant profile timing as the ideal values( correct me if i am wrong).
-I like the last line especially, You cannot compare the speeds of the two methods.
 Please let me know if i am thinking in complete stupid way or at least some thing in right path.
Thanks
uday,
Please Mark the solution as accepted if your problem is solved and help author by clicking on kudoes
Certified LabVIEW Associate Developer (CLAD) Using LV13