Messages

31

Video P*r*o*b*i*n*g / Re: Photos of webcam scanner. ( no laughing.. :) )

« on: July 23, 2008, 08:41:01 PM »

Hi Art,
I have had no success with meshing with MachCloud except your prop.txt
Is there a limit on the object size? For example when meshing the penny submitted by TomHubin the cloud disappears and no meshing is done.
Could it be a matter of parameter selection in Ball Pivot window? If so what would be proper parameters?
Best Regards,

Gaston.

32

Video P*r*o*b*i*n*g / Re: Post your Point Clouds Here!

« on: July 17, 2008, 01:57:19 PM »

Thanks Tom for the Ebay lens package reference,
I will look that up.
Right how I'm making a setup with 90deg (45-45) between camera and laser 
Gaston

33

Video P*r*o*b*i*n*g / Re: Post your Point Clouds Here!

« on: July 16, 2008, 07:57:36 AM »

Hi Tom,
I see your point. Thank you for the explanation.

You have mentioned previously here:

>I see that the camera is shipped with a lens for 70 degree FOV. The lens is replaceable. I suspect that the thread is M12-0.5mm. If so, you can get lenses on ebay. Search for >M12* and lens* in title and description...or I can point you to some I have seen listed. I intend to get some of these M12-0.5mm threaded lenses from ebay but have not yet >done so.

My search on Ebay was not very productive so I think I could use some pointers here.
Thank you,
Gaston

34

Video P*r*o*b*i*n*g / Re: Post your Point Clouds Here!

« on: July 15, 2008, 08:57:41 PM »

Hi Tom,
>Neither the camera nor the lens should be pointed straight down. The camera and the lens need to be pointed 90 degrees apart.
> I have chosen to have the laser 30 degrees CW from the Z axis and the camera 60 degrees CCW from the Z axis

As the same setup is used both for calibration and measurement why 90 deg be so important?
I see that the amplitude of the deviation would be maximized with 90 deg but as I understand it the results would not be more valid.

Gaston

35

Video P*r*o*b*i*n*g / Re: Post your Point Clouds Here!

« on: July 15, 2008, 12:27:06 AM »

Hi Tom,

>I have posted a scan setup from today. The video shows a single line through the center of the penny. Exposure time was set at 1/3840 seconds and the resolution was 640x480. Mirror (left to right) and Flip (top >to bottom) were selected since the camera is upside down.

Thank you, that was very useful. I do not have the facility to set the exposure time, the camera is taking 29.970 frames/sec and that's it.

>I think that only the FOV is different. I changed it from 18.1 degrees to 15.4 degrees and got better proportions on the penny. This is about right for the +12mm focal length lens that I use on the Digi Watchport/>V2 camera.

I have set the FOV to 70 which when calibrated with a 1" Styrofoam block give a distance approx right. The x-y dimensions seem also right.

>> 2. I have loaded the file thubin080712CloudPenny03.txt in MachCloud but when I go to mesh it the cloud disappears and no mesh is being done.
>> Have you mesh that cloud? If yes what settings do you make on the BallPivot mesh panel?

>I could not get meshing or any of that kind of stuff working in MachCloud.  I have not tried that in Rhino.

It seems that if the dimensions of the object are too small (not the number of points in the cloud) meshing swallows it  

>What camera are you using? Do you know the lens focal length? Do you know the field of view?

http://www.supercircuits.com/Security-Cameras/Board-Cameras/PC302XS with a digitizer The resulting image is 640x480 and black and white

I have found that the if I lower the voltage on the laser line generator I get a cleaner image of the line.

I have to work on my setup so I can change the distance between the camera and the laser easily. Right now the laser is pointing straight down and the camera is at ~45deg.

As for meshing in Machloud:
I do not understand what the Delauney Set is used for
BallPivot mesh seems to works ok with the Prop.txt supplied by Art but I have not so far succeed to pick winning values for the Ball Diameter, shortest Edge and Max Angle to produce the same kind of results on anything I have scan so far. I am using inches dimensions. I wish somebody could explain how to set those parameters?

Regards,
Gaston

 

36

Video P*r*o*b*i*n*g / Re: Post your Point Clouds Here!

« on: July 13, 2008, 12:54:12 PM »

Hi Tom,
Very neat your penny scan. I would like to reproduce it and I have two questions.
1. I would love to see a print screen of the 3DVideoProbe panel to make the scan of the penny. Could you please post it ?
2. I have loaded the file thubin080712CloudPenny03.txt in MachCloud but when I go to mesh it  the cloud disappears   and no mesh is being done. Have you mesh that cloud?
If yes what settings do you make on the BallPivot mesh panel?
Thanks,
Gaston

37

Video P*r*o*b*i*n*g / Re: Video plugin crashing windows?

« on: May 17, 2008, 05:38:17 PM »

Hi Mark,
To get the digitizer to work without crashing Windows I had to install the driver and the application that came with the digitizer. Now the digitizer shows up as "USB 2.0 A/V converter" in the Camera Control Source list.
 I have two of those digitizer: One is VStream VS-2800D and an other one by StarTech SVID2USB2. They seem interchangeable.
You can download the driver and application from  http://www.startech.com/item-download/SVID2USB2-USB-20-Video-Capture-Cable.aspx

Next step is to learn how to install and use this system to create models
Thanks to all for your contribution.
Gaston

38

Video P*r*o*b*i*n*g / Re: Video plugin crashing windows?

« on: May 16, 2008, 05:29:08 PM »

Where can I get that utility?
Gaston

39

Video P*r*o*b*i*n*g / Re: Video plugin crashing windows?

« on: May 16, 2008, 02:35:56 PM »

Thanks,
The problem Mark and I are talking about is not a performance problem, it is the STOP Blue screen, the so called "blue screen of death" as soon as the video plug in is selected in Mach3. The blue screen shows the 8E code and some references to emBDA.sys driver. The Kworld usb28xx digitizer is otherwise working ok. It is, so far, only in Mach3 that the problem arises. Maybe the plug in comes up with some default parameters incompatible with the digitizer driver I wish I knew. The video window does not have time to show up before the blue screen appears.   
Any idea
Gaston

40

Video P*r*o*b*i*n*g / Re: Video plugin crashing windows?

« on: May 12, 2008, 11:09:34 PM »

Hi Mark,
I have the same problem with a Kworld product. Have you ever found what was causing crash with blue screen?
Regards,
Gaston