Date   

3D-Con 2021 ‘3D on Social Media’ Special Interest Group #futureOf3D

Gordon Au
 

Stereo Friends,
 
At this year's virtual 3D-Con, I'll once again be moderating a Special Interest Group (SIG) on '3D on Social Media.' For those of you who share/view 3D content on Facebook, Instagram, or other platforms (including Stereopix, Phereo?, Flickr, Holopix, Orbix, etc.), I'd be interested in your thoughts! (Although this group isn't traditional social media, I'll be mentioning it as well.) What do you think this SIG should include? Here are some specific questions:
 
- What information would help to improve your experience of sharing your own 3D work on Instagram, FB, or other social media sites?
- What would you like to see more of in terms of 3D on your favorite social media?
- What do you wish you knew when you first joined whatever social media you use? What advice would you give newcomers?
- Are there specific people you’d like to hear speak and/or ask questions of?
- What did we miss in last year’s SIG?
- Any other thoughts/suggestions/ideas?
 
The goal is to make this year’s SIG different—to present new info/viewpoints from last year, which was fairly wide-reaching. Last year covered the general benefits/advantages and drawbacks/limitations of social media, and for each platform: the most suitable 3D formats, ease of sharing/viewing 3D, ease of starting, pros/cons, example hashtags/groups, and tutorials; plus we had some speakers discuss specific platforms and formats. If you missed it, you can rewatch it on YT (http://www.youtube.com/watch?v=CEVTRRzH7lo), and see the summary document on the 3D-Con website (http://www.3d-con.com/2020/addl_wk_gordonau.php).
 
Thanks for any ideas!
 
- Gordon


Re: base-to-base mounting for Sony RX-100 #sony3drigs #twinrig

David_in_VA
 

I understand the math that says the stereo base can be calculated as a function of focal length, deviation, object distance, etc. (Ferwerda page 238; Waack page 68), but how does that actually relate to the stereo image?  Can someone help me understand this?  I must be missing something.  Cropping clearly doesn't change the original camera locations, which I thought were the endpoints of the actual stereo base.  So are we calculating an "effective stereo base"?  If so, what does it mean and how does it affect the stereo image?  Thanks.


Re: Phorlorn Phereo Phailed

JackDesBwa|3D
 

I forgot about it, but I launched a script a few weeks ago, so that I can now give some stats about the images on phereo.

There are 248536 public images and 18180 of them returned an error (bypassing the certificate errors), which is 7.3% or 1 over 13.7 in average [at least during this test period]
I did not test all variants available on the site, only the biggest definition.
The images still available weight about 157GB (only one variant) as far as I can tell, and the metadata probably around 100MB.

Repartition of the losses over time is attached.
The intuition that most errors appeared around early 2019 is confirmed, and almost all of the images published after this moment are apparently lost. :-(

JackDesBwa


Stereopix & Internet Archive

JackDesBwa|3D
 

Yesterday and the day before, there was a peak of traffic on Stereopix.
After investigation, it came from San Francisco, and more precisely from the Internet Archive whose bots downloaded about 950MB of data.

I found this reference https://archive-it.org/collections/16921, but when clicking on the relevant entry, the site says that it is "Not in Archive".

Does anyone know something about this?

JackDesBwa


Re: Twin camera Overlapping/Staggering

JackDesBwa|3D
 

By the way, I do not have the same weird artifacts than Antonio when aligning the piano image; only the remaining perspective due to the tilted effective base.
With different sampling points, I have an initial vertical error of 4.6px max and 2.8px average (with standard deviation of 1.2) reduced to 0.6px max and 0.2px average (with standard deviation of 0.2); errors of control point placement included of course.

Without cropping top/bottom borders:
sitting3a_realigned.jpg

JackDesBwa


Re: Twin camera Overlapping/Staggering

JackDesBwa|3D
 

Oh, I did not check my messages for a few days, and you wrote a lot in the meanwhile.
I will avoid coming back to the discussed points, but I can add something about perspective.

If you shoot with the cameras pointing forward, the effective base is tilted (as said before), so that when you align the images with precision, there will be a perspective effect in the final image due to this tilt.
Let's illustrate with an example:
top_p1.jpg
After alignment & crop:
r1.jpg
The effect is visible (one hear bigger than the other for example), but I admit that I thought it would be more obvious with an angle of 18.4° (maybe the scene is not adapted to show it clearly?).

One solution could be to rotate the rig so that the effective base is perpendicular to the depth direction of the final photograph, which also means that the cameras are not pointing to the subject:
top_p2.jpg
After alignment & crop:
r2.jpg
There is a perspective in the left & right images of the cameras, but once corrected, there is no unwanted perspective in the final stereoscopic image.
The crop is significative, though I cut it more than needed for a real scene with more content:
r2_crop.jpg

This way of doing will not work with all focal lengths though. Here with a 50mm lens instead of 24mm of the previous cases, the subject cannot be in the field of view of the cameras:
top_p3.jpg

For reference, here is the result with a off-axis stereoscopic camera with a base of a bit more than 79mm (approximating the effective base of the overlapping twin):
top_p0.jpg
Trying to crop approximately the same way:
r0.jpg
The result is not 100% the same, but very close. The slight differences might be caused by the precision losses, for example with the base length of the stereoscopic camera, the angle in the perspective transform, etc.
But since projective transforms are linear algebra, there is no secondary order artifacts (in the mathematical sense, which means that from a mathematical point of view, the two ways with maximal precision will result in exactly the same image).

While theoretically possible, correcting the perspective correctly is not simple and we might have to sacrifice alignment accuracy for other considerations.

If you want to play with this, I attached the blender project. A few tips if you open the file:
- The different configurations are in layers, so you can switch with the layers button, which is at the top-right
ui_layers.jpg
- You can see in colors in the interface by selecting the rendering mode (top-right of each 3D view)
ui_shading.jpg
- The top view is selected with View>Viewpoints>Top view (Numpad 7)
- The camera view is selected with View>Cameras>Set Active Object as Camera (Ctrl-Numpad 0) ; you should select the camera you want to see/render first
- You can render with F12 and save the render with Alt-S in the render window [I corrected the perspective of the rendered image with hugin afterwards]

JackDesBwa


Hyperstereo

John Rupkalvis
 

George ~

Attached anotated description of my wireless dual camera synchronized
hyper stereo system that sends the sync signal to the other camera via
RF (radio frequency). Also attached, a hyper stereo shot done with
this rig. Essentially a genlock system with the sync signal sent by
radio.

On 6/16/21, George Themelis <gathemelis@gmail.com> wrote:
Yes, some images were printed darker than normal, but especially John Hart’s
Featured 3D pictures, so we decided to offer this article for download. The
direct link is below. Every issue has its own page, for issue 122 the page
is:

https://www.isu3d.org/stereoscopy-journal-122-2020-2.html

(and John’s article has the link for download there)



I have not received 124 yet either, but I have heard from members in Europe
who have received it.



I am now finishing issue 125. This is a special issue on Hyperestereos. I
have a received a lot of contributions (articles and pictures for the 3D
Gallery) so I will continue the hyperstereo topic in the next issue too.



If you have not sent me your Hyperestereo images and related material, it is
not too late to do it now!



Thanks,



George Themelis

Stereoscopy Editor



From: Alexander Klein
Sent: Wednesday, June 16, 2021 7:43 AM
To: main@photo-3d.groups.io
Subject: Re: [Photo-3d] ISU Issue 122 download?



Dear Robert,

the pdf can be downloaded at https://isu3d.org/Hummingbirds-by-John-Hart.pdf

Issue 124 has been mailed - and should have started to reach some members
(at this stage mostly in Europe). Have not heard any feedback from members
yet ...

Best regards,

Alexander Klein
Treasurer
International Stereoscopic Union
P.O. Box 102634
70022 Stuttgart
Germany
Tel: +49(711)5208768-3
Fax: +49(711)5208768-9



Am 16.06.2021 13:32, schrieb robert mcafee via groups.io:

There is a note in ISU issue 123 that images in issue 122 printed dark and
therefore the issue was made available for download by members. I was not
able to locate the download link. Can anyone direct me to it?


Also I had not received issue 124 (last issue of 2020) but I see that
issue was delayed and was just mailed in May. Hope to see mine soon




--
John A. Rupkalvis
stereoscope3d@gmail.com

[image: Picture]


Re: Fujifilm W3 not functioning

John Clement
 

Whatever happened to the repair services?  We had a 30 year old Maytag washer that could still be repaired!  Hopefully a newer 3D camera will come out to replace the W3.  Do they really think a 2D camera is a reasonable replacement?

 

John M. Clement

 

 

 

That info fits with what I remember from several years ago. In the past, Fuji would sent a replacement refurbished camera if under warranty ( or extended manufacturer  warranty ) , for the standard repair price. And later they stopped accepting W3s for repair. Panasonic had similar policies for their 3D1 camera, and will no longer repair them. As I recall, both companies thought customers would be happy to get a newer 2D camera as a replacement. 8-(      Linda



_._,_._,_


Re: Fujifilm W3 not functioning

 

That info fits with what I remember from several years ago. In the past, Fuji would sent a replacement refurbished camera if under warranty ( or extended manufacturer  warranty ) , for the standard repair price. And later they stopped accepting W3s for repair. Panasonic had similar policies for their 3D1 camera, and will no longer repair them. As I recall, both companies thought customers would be happy to get a newer 2D camera as a replacement. 8-(      Linda


On Jun 16, 2021, at 3:38 PM, robert mcafee via groups.io <geargod2@...> wrote:

 Someone in the NY club stated they had a failed W3 they sent back for repair and Fuji just sent the a new (or refurbished) camera. 

Recently there was a W3 for sale for parts (not working). I contacted Fuji USA service to see if they work service or had replacements. In USA service or replacement is no longer available (at least according to the service person with whom I spoke)




On Wednesday, June 16, 2021, 3:51 PM, Oktay via groups.io <akdens2@...> wrote:

I'll try the Fujifilm Service first.
If they are unable to repair it or the repair cost is more than a used camera , I will buy a second hand W3.

In spite of it's mediocre image quality especially in low light, I use this pocketable camera frequently because its very practical and useful.

Oktay


Re: Stereopix ROOMS YouTube Video #ROOMS

KenK
 

Many groups are now using Stereopix Rooms during their zoom calls but some of the participants may not be familiar with the interface.
Here is a short 2 minute YouTube video on how to use Stereopix Rooms from a users perspective
https://tinyurl.com/RoomsUser

(see the YouTube video description for additional info and a few "Thank You"s to some very talented folks) 

KenK


Re: Fujifilm W3 not functioning

robert mcafee
 

Someone in the NY club stated they had a failed W3 they sent back for repair and Fuji just sent the a new (or refurbished) camera. 

Recently there was a W3 for sale for parts (not working). I contacted Fuji USA service to see if they work service or had replacements. In USA service or replacement is no longer available (at least according to the service person with whom I spoke)




On Wednesday, June 16, 2021, 3:51 PM, Oktay via groups.io <akdens2@...> wrote:

I'll try the Fujifilm Service first.
If they are unable to repair it or the repair cost is more than a used camera , I will buy a second hand W3.

In spite of it's mediocre image quality especially in low light, I use this pocketable camera frequently because its very practical and useful.

Oktay


Re: Fujifilm W3 not functioning

Oktay
 

I'll try the Fujifilm Service first.
If they are unable to repair it or the repair cost is more than a used camera , I will buy a second hand W3.

In spite of it's mediocre image quality especially in low light, I use this pocketable camera frequently because its very practical and useful.

Oktay


Re: Fujifilm W3 not functioning

Martin Schub
 

On the plastic parts wearing out: The styling and spec similarities of the 2D Fuji Finepix Z-series cameras from about this time has made me wonder whether some of the internal parts might be interchangeable with the W1/W3, so that cheap used 2D cameras might be a source of replacement parts.  For example, the Fuji Finepix Z30 has a 35-105mm zoom and a 1/2.3", 10 megapixel sensor, just like the Fuji W1 and W3, and it was introduced in 2009, like the W1.  The same is true of the Fuji Z20fd (2008), the Z35 (2009), and the Z37 (2009).  I don't have a good feel for the used prices of these, but it might be something to think about.


Whitney The 3D VR Experience 3D via AI and audio Remix

Philip Heggie
 

Whitney The 3D VR Experience 3D via AI and audio Remix

for Google Cardboard and VR Headsets for phones or 3dtv's

 

https://www.youtube.com/watch?v=zyfGn55-Nx8

 

 

Sent from Mail for Windows 10

 


Re: Fujifilm W3 not functioning

Laurent DOLDI (Toulouse, France)
 

In case someone needs a W3, I have one to sell new in box never opened.


Re: ISU Issue 122 download?

George Themelis
 

Yes, some images were printed darker than normal, but especially John Hart’s Featured 3D pictures, so we decided to offer this article for download. The direct link is below. Every issue has its own page, for issue 122 the page is:

https://www.isu3d.org/stereoscopy-journal-122-2020-2.html

(and John’s article has the link for download there)

 

I have not received 124 yet either, but I have heard from members in Europe who have received it.

 

I am now finishing issue 125. This is a special issue on Hyperestereos. I have a received a lot of contributions (articles and pictures for the 3D Gallery) so I will continue the hyperstereo topic in the next issue too.

 

If you have not sent me your Hyperestereo images and related material, it is not too late to do it now!

 

Thanks,

 

George Themelis

Stereoscopy Editor

 

From: Alexander Klein
Sent: Wednesday, June 16, 2021 7:43 AM
To: main@photo-3d.groups.io
Subject: Re: [Photo-3d] ISU Issue 122 download?

 

Dear Robert,

the pdf can be downloaded at https://isu3d.org/Hummingbirds-by-John-Hart.pdf

Issue 124 has been mailed - and should have started to reach some members (at this stage mostly in Europe). Have not heard any feedback from members yet ...

Best regards,

Alexander Klein
Treasurer
International Stereoscopic Union
P.O. Box 102634
70022 Stuttgart
Germany
Tel: +49(711)5208768-3
Fax: +49(711)5208768-9

 

Am 16.06.2021 13:32, schrieb robert mcafee via groups.io:

There is a note in ISU issue 123 that images in issue 122 printed dark and therefore the issue was made available for download by members. I was not able to locate the download link. Can anyone direct me to it?


Also I had not received issue 124 (last issue of 2020) but I see that issue was delayed and was just mailed in May. Hope to see mine soon

 

 


Re: ISU Issue 122 download?

Alexander Klein
 

Dear Robert,

the pdf can be downloaded at https://isu3d.org/Hummingbirds-by-John-Hart.pdf

Issue 124 has been mailed - and should have started to reach some members (at this stage mostly in Europe). Have not heard any feedback from members yet ...

Best regards,

Alexander Klein
Treasurer
International Stereoscopic Union
P.O. Box 102634
70022 Stuttgart
Germany
Tel: +49(711)5208768-3
Fax: +49(711)5208768-9


Am 16.06.2021 13:32, schrieb robert mcafee via groups.io:

There is a note in ISU issue 123 that images in issue 122 printed dark and therefore the issue was made available for download by members. I was not able to locate the download link. Can anyone direct me to it?


Also I had not received issue 124 (last issue of 2020) but I see that issue was delayed and was just mailed in May. Hope to see mine soon



ISU Issue 122 download?

robert mcafee
 

There is a note in ISU issue 123 that images in issue 122 printed dark and therefore the issue was made available for download by members. I was not able to locate the download link. Can anyone direct me to it?


Also I had not received issue 124 (last issue of 2020) but I see that issue was delayed and was just mailed in May. Hope to see mine soon


Re: Fujifilm W3 not functioning

robert mcafee
 

Recalling the posting where the pin problem was described, the individual replaced the plastic pins with metal (somehow). 

Anyone have a service manual for the W3?  

Anyone know if Fuji is still servicing the W3?  May guess would be they are not. 




Re: Fujifilm W3 not functioning

Depthcam
 

> This may explain why one of the pair of images is sometimes not well focused.


The focus problem is a different problem than the zoom problem.  The focus problem is actually due to the fact that each lens on the W3 focuses independently so that, in some cases, one lens will focus on a nearby subject while the other will focus on a subject further away.  The reason for this is because it is required in the advanced 3D mode where each lens must be able to focus independently.  The same occurs with twn camera rigs where again each lens may focus at a different distance.

In respect to Oktay's problem, that "bzzz" sound may indeed suggest a problem with the zoom mechanism.  But that would only be the case if you have been making extensive use of the zoom over the life of the camera.

Francois

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