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Problems with my First Scan

Questions, problems, comments and tips regarding the 3d scanning process.

Problems with my First Scan

Postby abhishek.c » Thu Jun 21, 2012 9:51 am

Hi,
I am new to the world of David Laser Scanning, was a user of NextEngine. But am really excited to try David Just received my order, following is my setup:

1. Blue Line Laser, adjustable focus
2. DAVID USB CCD Monochrome Camera (XGA) with Lens
3. DAVID-Laserscanner Pro Edition USB Version 3.3

Being new to David I guess I am not able to get my act together with this amazing scanning setup, I am trying to scan with good results but am getting very grainy scans cant figure out what am I doing wrong. Following are my image posts

This is the item I am scanning (With Calibration done)

Image

This is my Laser Line in the scanning Window

Image

This is the liveview while scanning

Image

The Final Scan

Image

What am I doing wrong, how do I improve my scan output, I am doing scanning by hand.

I also have a few questions
1. What should be the minimum/maximum distance between the camera & the Panel. What angle should the laser be from the object?
2. While calibrating I see green points with red points/markers should I get only red/green markers/pointers?
3. How can I turn the green points off after calibrating?
4. How should I scan, is there a step by step guide available say on you tube which can help me?

Thanking you in Advance, eagerly awaiting your response

Regards
"Abhishek"
Thanking You in Anticipation...

Regards

"Abhishek"

My Setup:
1. Blue Line Laser, adjustable focus
2. DAVID USB CCD Monochrome Camera (XGA) with Lens
3. DAVID-Laserscanner Pro Edition USB Version 3.3
abhishek.c
 
Posts: 21
Joined: Thu May 17, 2012 2:05 pm

Re: Problems with my First Scan

Postby abhishek.c » Thu Jun 21, 2012 11:23 am

Am trying to scan with different settings, but the result is more or less the same

Image

Very Grainy output
Thanking You in Anticipation...

Regards

"Abhishek"

My Setup:
1. Blue Line Laser, adjustable focus
2. DAVID USB CCD Monochrome Camera (XGA) with Lens
3. DAVID-Laserscanner Pro Edition USB Version 3.3
abhishek.c
 
Posts: 21
Joined: Thu May 17, 2012 2:05 pm

Re: Problems with my First Scan

Postby WalterMo » Thu Jun 21, 2012 12:04 pm

Hi,
Some hints:
1. Don't start to scan an object with a not perfect surface, means with a glossy or too dark one. Even a varnished can can cause problems. Use a matt bright object. E.g. a roll of toilet paper. :wink: Some plastics are also difficult to scan.
2. Hold the laser a bit steeper to increase the angle between camera and laser.
3. Better to move the laser line one time very slowly than multiple times fast.
4. Focus the laser and the camera sharp to the object, not to the background walls.
5. Don't care about the green crosses, they only mark the points and rings of the calibration sheets.
6. Increase a bit the brightness of the laser line in the camera settings. (Your second screen shot).

Let's see what happens.

Walter
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Re: Problems with my First Scan

Postby abhishek.c » Thu Jun 21, 2012 12:28 pm

Dear Walter

Thanks for your reply.... I worked on your suggestions & changed the subject to a Telephone Instrument, the results were immediately better. I just need to find out what can be done to make it the desired output

The Item to be scanned

Image

The scan window (laser Line Brightness increased)

Image

Image

Scanning Window (Real time View)

Image

Final Scan

Image

Also pardon my ignorance but what exactly do we mean by focusing the laser, as focusing the camera on object is easy to understand, but how do I focus the laser.

Awaiting your feedback on the scan, now what do I do next?

Thanks & regards

"Abhishek"
Thanking You in Anticipation...

Regards

"Abhishek"

My Setup:
1. Blue Line Laser, adjustable focus
2. DAVID USB CCD Monochrome Camera (XGA) with Lens
3. DAVID-Laserscanner Pro Edition USB Version 3.3
abhishek.c
 
Posts: 21
Joined: Thu May 17, 2012 2:05 pm

Re: Problems with my First Scan

Postby WalterMo » Thu Jun 21, 2012 12:39 pm

To focus the camera: Place the object in front of the corner and adjust the camera's lens to maximal sharpness. Reduce the iris of the lens to about its half size. Then remove the object and do the camera calibration. Then put the object at the same place as before to scan it.

To focus the laser: If your laser has an adjustment ring for focusing, so adjust a fine line on the object.

Sorry, I am in a hurry.....

Walter
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Re: Problems with my First Scan

Postby abhishek.c » Thu Jun 21, 2012 12:59 pm

Not a problem, thank you for your insight & prompt reply.

Thanks
"Abhishek"
Thanking You in Anticipation...

Regards

"Abhishek"

My Setup:
1. Blue Line Laser, adjustable focus
2. DAVID USB CCD Monochrome Camera (XGA) with Lens
3. DAVID-Laserscanner Pro Edition USB Version 3.3
abhishek.c
 
Posts: 21
Joined: Thu May 17, 2012 2:05 pm

Re: Problems with my First Scan

Postby WalterMo » Fri Jun 22, 2012 7:41 am

Hi Abhishek,
You see that some parts of the telephone are fine scanned. That's a good start! And you see that the display and the buttons couldn't be scanned because its surface is reflecting or too dark. For such case it's necessary to coat the surface:
viewtopic.php?f=2&t=1283

Take care that the calibration corner wasn't shifted after the calibration. I mean the first screen shot of the telephone device and the green crosses.
I try to avoid smoothing of the scan. I only set interpolation to 1-3.

If you like to do „motorized“ scanning you can start with Mattia's kitchen timer drive. It's a good way to uniformly move the line over the object:
viewtopic.php?p=2016#p2016

Not every laser is focusable, but the 3 types from the DAVID shop are adjustable. Maybe you have such one.

Walter
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Re: Problems with my First Scan

Postby abhishek.c » Fri Jun 22, 2012 11:25 am

Dear Walter

Thanks for your suggestions, actually the Buttons were black in color so it wasnt scanning properly. Would try the Kitchen timer setup, actually am very keen on building a motorized setup, but I really have very poor knowledge in electronics so was unable to follow the great setups suggested in the forum. I need help then I can do it I am sure.

I would like to know how can I improve my scan quality, based on whatever I have done so far.
Follwoing is my setup

1. Blue Line Laser, adjustable focus
2. DAVID USB CCD Monochrome Camera (XGA) with Lens
3. DAVID-Laserscanner Pro Edition USB Version 3.3

I do have the Laser with adjustable focus, but still am finding best ways to focus the laser.

I am really hopeful to get guidance from you guys to do good scans, I was already using nextEngine scanner & have bought David with great expectations.

Thanking You In Advance

Regards

"Abhishek"
Thanking You in Anticipation...

Regards

"Abhishek"

My Setup:
1. Blue Line Laser, adjustable focus
2. DAVID USB CCD Monochrome Camera (XGA) with Lens
3. DAVID-Laserscanner Pro Edition USB Version 3.3
abhishek.c
 
Posts: 21
Joined: Thu May 17, 2012 2:05 pm

Re: Problems with my First Scan

Postby abhishek.c » Fri Jun 22, 2012 12:36 pm

Hi,

I would also appreciate if someone can share the best startup stand/setup I can put up for my Camera & Laser without much knowledge of Electronics. I would definitely want to graduate to the automated plane-less scanning platform but to start with can I start with some easy setup, which helps me get better control & results.

Thanks & Regards

"Abhishek"
Thanking You in Anticipation...

Regards

"Abhishek"

My Setup:
1. Blue Line Laser, adjustable focus
2. DAVID USB CCD Monochrome Camera (XGA) with Lens
3. DAVID-Laserscanner Pro Edition USB Version 3.3
abhishek.c
 
Posts: 21
Joined: Thu May 17, 2012 2:05 pm

Re: Problems with my First Scan

Postby manish » Sat Jun 23, 2012 9:09 am

hi abhishek,

i am also working on this software for a year.
at start it was a bit problem, struggling like u.
now its seems i have got grip(off course not like Walter or any other experts in forum).
but results coming r acceptable can be model easily.
from which country u belong??? i guess india.
if so which part and ur contact no.
may be we can come together share the ideas.

Regards
Manish
manish
 
Posts: 120
Joined: Sat Oct 30, 2010 6:18 pm
Location: mumbai

Re: Problems with my First Scan

Postby abhishek.c » Wed Jun 27, 2012 7:53 am

Hi

Would love to hear from you guys on the possibilities of making a scanning rig, again I would like to say that I am not too good with Electronics so I request for details/suggestions on making a semi automated Mechanical rig which can help me get good results.

Manish, I have sent you a PM. Thanks for your reply

Thanking all of you in Advance

Regards
"Abhishek"
Thanking You in Anticipation...

Regards

"Abhishek"

My Setup:
1. Blue Line Laser, adjustable focus
2. DAVID USB CCD Monochrome Camera (XGA) with Lens
3. DAVID-Laserscanner Pro Edition USB Version 3.3
abhishek.c
 
Posts: 21
Joined: Thu May 17, 2012 2:05 pm

Re: Problems with my First Scan

Postby abhishek.c » Mon Aug 27, 2012 1:46 pm

Hi

Was trying to scan again after a long break, as I have put together a small mechanical setup for movement of laser (I was always weak in understanding Electronics so could not do the automated setup :( .....)
Now I am getting a recurring error about Left & Right laser not being on the same plane, am attaching a few images for your ready refernce

1. Live Camera View (Object I am trying to scan is a Telephone Instrument)

Image

2. Laser View Screen Shot

Image

3. The Error I am getting

Image

As you can see in the above image I get a good scan upto a point & then suddenly I get the error & missing scans, what should I do???


I tried moving the laser, changing the angle of the laser, I would really appreciate if I can get the following info:

1. What is the reason we get the plane error?
2. What is the optimum setup, is there a General Arrangement I should follow, I would like to know what should be distance between Camera & Laser (With the best angle)... for getting the best scans?

Thanking you in advance, now awaiting your reply anxiously....

Regards
"Abhishek"

My Setup:
1. Blue Line Laser, adjustable focus
2. DAVID USB CCD Monochrome Camera (XGA) with Lens
3. DAVID-Laserscanner Pro Edition USB Version 3.3
Thanking You in Anticipation...

Regards

"Abhishek"

My Setup:
1. Blue Line Laser, adjustable focus
2. DAVID USB CCD Monochrome Camera (XGA) with Lens
3. DAVID-Laserscanner Pro Edition USB Version 3.3
abhishek.c
 
Posts: 21
Joined: Thu May 17, 2012 2:05 pm

Re: Problems with my First Scan

Postby WalterMo » Mon Aug 27, 2012 7:13 pm

Hi Abhishek,
Your telephone device is too wide in relation to the size of the calibration corner. The camera should „see“: 1/3 of the laser line on the left wall, 1/3 on the object and 1/3 on the right wall.

If you would use planeless scanning then 3/3 of the laser line could lie on the object!

Regarding the angle between camera to object and laser plane to object: It's called intersection angle. This angle should be about 30°- 40°. You are using DAVID 2.6.3 or similar, so this angle will be displayed by DAVID during scanning.

Walter
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WalterMo
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Re: Problems with my First Scan

Postby abhishek.c » Tue Aug 28, 2012 9:54 am

Hi WalterMo

Thanks for your prompt reply, but what should I do to remove the Left & Right Laser plane error, should I increase the distance between object & Camera? Is the error solely because of the object being too wide wrt the calibration plane...

Also I am not planning to go for Planeless Scanning as I am not that proficient in Electric Circuits & hence am not able to make the arduino based device, I have in the mean while made a Mechanical Device to control the Movement of Laser for scanning...

Please do share any other tips I need to follow, I think I need much more help for fusing as there seems to be no document on how to do fusion....

You are a life saver & a great help.....

Thanking You again
Thanking You in Anticipation...

Regards

"Abhishek"

My Setup:
1. Blue Line Laser, adjustable focus
2. DAVID USB CCD Monochrome Camera (XGA) with Lens
3. DAVID-Laserscanner Pro Edition USB Version 3.3
abhishek.c
 
Posts: 21
Joined: Thu May 17, 2012 2:05 pm

Re: Problems with my First Scan

Postby abhishek.c » Tue Aug 28, 2012 11:44 am

Hi,

I tried moving the Camera Further Away but am getting the same errors, I think there is something I am missing in the setup, am attaching the snaps of my setup for you to please comment & suggest

Following is the setup I made using 2 Tripods, One for Camera & Other for Holding the attachment with which the laser moves

Image

My Current Setup with which I am trying to scan the Telephone Instrument

Image

What should I try doing now??
Thanking You in Anticipation...

Regards

"Abhishek"

My Setup:
1. Blue Line Laser, adjustable focus
2. DAVID USB CCD Monochrome Camera (XGA) with Lens
3. DAVID-Laserscanner Pro Edition USB Version 3.3
abhishek.c
 
Posts: 21
Joined: Thu May 17, 2012 2:05 pm

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