回复： coordinate transform--robot

[Time_Walker]

hello master:

  as i knew, the unit of coordinates of center return by "Pattern match" is "pixcel" in image. but actually we may send coordinate with "mm" or "cm" unit  to robot in application. my question is how to transorm the coordinate from "pixcel" to "mm" or "cm".  is there any master could give me information or example on how to do  it?

  thank you very much in advance.

thanks and best regards

viming.chen

[Time_Walker]

any help?

[muks]

You can directly map the pixels to your measurement cordinates. Can you physically measure how much mm your object is and see the corresponding pixels in the image.

[Hatef.fouladi]

you have to calibrate your image first

[Time_Walker]

sir, how to do it? now i have a application to do like this:

a PCB on the position of production line, use Camera to postion it and tell the robot coordinate to fetch it out?  i know how to pattern match, but i don't know how to translate the coordinate that we got from pattern match to the coordinate which Robot use. 

thanks.

[Time_Walker]

how to calibrate the image first ,sir?

[Hatef.fouladi]

https://zone.ni.com/reference/en-XX/help/370281M-01/nivisionlvbasics/perspective_and_nonlinear_disto...


http://www.ni.com/example/30631/en/

https://zone.ni.com/reference/en-XX/help/370281M-01/imaqvision/imaq_set_simple_calibration/

[Time_Walker]

hello sir:

  thanks for your reply. i had read some information about the calibration. but i don't know how to calibrate step by step with "NI Calibration training interface" . would you like to give me a sample or example on this topic? thanks you very much~

[Hatef.fouladi]

there is many example for this request inside NI example 
check these bellow 

[Hatef.fouladi]

also check this