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From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
02-12-2014 06:10 AM
I worked with pattern matching, work fine but when I was looking objects revolved over 360 degrees you lose control, tracking patterns have this limit with objects that rotate more than one revolution on its axis
02-12-2014 07:53 AM
Hello,
if an object rotates 360 deg (let's say around its axis), it rotates back to the the initial position. The number of full rotations have no effect on this.
Did you train the pattern for full rotation, e.g. 0 to 360 or -180 to 180 deg?
Thing that could affect the detection:
- non-uniform contrast change
- scale change
- perspective/affine transformation
In my experience the NI pattern matching works very well under the right circumstances.
Best regards,
K
02-24-2014 10:45 AM
Hello friend
I would to know if possible get a accuracy of 1mm using NI Vision.
I am taking width measurement from a steel strip under movement which it could be from 750 to 1900mm width.
I am researching a camera from Basler or Ximea. Advices about the best camera will be welcome.
Thanks,
Alexandre
02-24-2014 11:07 AM
02-25-2014 06:08 AM
Hello friend
Thanks for the link, It made me more concious about the importance of selection of lens and CCD.
I know that for my project, 90% of the sucess is the correct choice for CCD and lens. Because this I am searching more literature like that.
If you know, please send me.
Thanks,
Alexandre.
02-25-2014 06:54 AM
Don't forget the proper scene illumination also...
There are quite a few guidelines on the web, you should have no problem searching for them. Also, the camera and lens manufacturer clould (should) probably help with any additional questions?
Best regards,
K
02-25-2014 08:18 AM - edited 02-25-2014 08:18 AM
Klemen escribió:
Hello,
if an object rotates 360 deg (let's say around its axis), it rotates back to the the initial position. The number of full rotations have no effect on this.
Did you train the pattern for full rotation, e.g. 0 to 360 or -180 to 180 deg?
Thing that could affect the detection:
- non-uniform contrast change
- scale change
- perspective/affine transformation
In my experience the NI pattern matching works very well under the right circumstances.
Best regards,
K
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You can tell me how to configure for full rotation, e.g. 0 to 360 or -180 to 180 deg?
02-26-2014 12:35 AM
Hello.
Here you go:
Best regards,
K
06-20-2014 12:38 PM
Sir, I need to detect triangles in an image. How do i proceed? IMaq has inbuilt func for detect shapes for circle and rectangle but not fot triangle.
06-20-2014 01:57 PM
Kaus,
You are just hijacking threads which is not going to help much. Please start a new thread and try particle analysis as suggested in the other thread. Also in your NEW thread post an image if possible