[Help] Webcam Image distance measurement?

[Kristen_K.]

Hi M3rcY,

In sequence step 3,  the calibration setup parameters are defined.  This is where you put your information about your calibration grid (the dotted page).  The program then uses this information to correct the image of the coins (sequences 8 and 9) in order to accurately measure their areas. It seems to me that you would actually want to know how much an object is changed, based on how far away it is, rather than correct it.  I believe this should work okay with different shapes. 

Kristen H. 

[vigvi]

Hi all,

Need few suggestions:

1. I am trying to find the distence( in cm) between two points using image processing(one is fixed intentionally other point is not fixed and keeps varying).

2. If I use ball of different diameters as a point here,can I find the diameter of the ball also simultaniously .

3. Both are in realtime.

Im using labview ver 2011. I use a logitech webcam for image acquisition.

In brief:

In my experimental setup,camera will be faced towards a plain white background (say wall).There will be a permanent marker on the center and also rays of light(one at a time) will be seen on the wall( but it keeps varying).so my objective is to;

a) find the distence between the permanent marker and the center of mass of the incident light.

b) find the diameter of the incident ray on the wall.

Please find the attachment.

In below attached image,my objective is to find distence 'a' and 'b'.

Thanks,

[Call.Me.Wilbur]

Have you tried the suggestions given by ogk.nz in response to your other post?

http://forums.ni.com/t5/LabVIEW/Calculate-distance-between-two-points/m-p/3232391#M940155

Also, since this thread is several years old I recommend either sticking to the above thread or creating a new one in the Machine Vision forum.

http://forums.ni.com/t5/Machine-Vision/bd-p/200