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Author Topic: Output currently displayed. Nothing displayed: Update: Fixed. Got new problems  (Read 1081 times)
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Alber
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« on: February 16, 2020, 12:38:37 AM »

Just starting out. I didn't see the answer to my question but maybe I just don't know how to search for it.
Trying to use the stereo photometr y tool. When I try to output my results (STL or DFX) the screen image that I have created disappear s and I'm given the options to output the current display or all individua lly. Objects to export is blank.

What am I missing?

BTW there is nothing in my project tree.

Thanks for any help.




« Last Edit: February 17, 2020, 10:42:37 PM by Alber » Logged
ArtF
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« Reply #1 on: February 16, 2020, 02:09:06 PM »

Hi:

  When your screen 3d looks ok, you need to press the "Add stl" button. This will add the stl to
your project screen for export. If it doesnt create one, you havent changed the x,y output size, if the
system see's that hasnt been changed, it flashes a quick message at the top telling you the output res
needs to be rational. . its default is the camera resolutio n..

Art
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BobL
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« Reply #2 on: February 16, 2020, 02:09:37 PM »

Alber;

 From what I remember of stereo Photometr y, 4 steps must be followed in sequentia l order for it to work. 1)pick you camera and res, 2) load bmp image and set the acquisiti on speed, 3) calculate normal's, 4) create 3D. From the impressio n I get of the problem you're experienc ing, is it possible you left the output size set to X0,Y0.Z0 before export?

Cheers
Bob
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Alber
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« Reply #3 on: February 17, 2020, 10:28:47 PM »

Thanks. At first, I was not sure what you meant by changing the output to something reasonabl e. Then I hit Add STL several times and realized that it said change it from pixels to inches or mm. I just deleted a zero and it was happy. I'm not sure if it thinks that it is inches or mm.

The captured images don't look very good. I thought that it was exposure so I changed the Aquisitio n speed.

I switched to a TV screen that is 38" diagonal. I taped the webcam to the center of the screen and turn the lights off.

Aquisitio n speed questions . It does not seem to make much differenc e here is 25ms and here is 250ms.

Aquisitio n speed does seem to increase the confidenc e but I'm gettings numbers in the 20-50 range.

I also have to change the Y fisheye correctio n and the gradient scale to get anything like my face. One benefit is that the rest of my head looks like the Greek god Hermes

Thank you in advance for any advice.



* 25msPhotos.JPG (22.52 KB, 337x319 - viewed 95 times.)

* 250msPhotos.JPG (22.48 KB, 349x325 - viewed 106 times.)

* typical.JPG (104.65 KB, 885x842 - viewed 97 times.)
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ArtF
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« Reply #4 on: February 18, 2020, 10:16:23 AM »

Hi Alber:

  Not unusual to get output similar to what you show. I found I had to play with the camera settings like
white balance and such to tame it down. I also recommend clipping it, this removes the drawn out backgroun d.
  the output varies a lot though depending on camera used, monitor, darkness. .etc.
Play with the settings, its really a matter of finding the sweet spot.

     Monitors arent great at providing light for that type of 3d determina tion. Im working presently on a new
method, but you need a projector for structure d light 3d to work. It may appear in a future vexx.

   The head in the photo below was machined into HDF as an inward 3d head. Its eyes follow you as you walk past
it and its stl came form the webcam module. Its not a perfect 3d of myself, but its close enough to be eerie..

Art
  


* head.jpg (1967.24 KB, 3024x4032 - viewed 114 times.)
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Alber
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« Reply #5 on: February 18, 2020, 03:56:26 PM »

Great. Thanks. I was doing a lot of fiddling now I know I not totally on the wrong track. 

What does clip do?

Will one of those cheap portable projector s that say HDMI but that only describes the cable. They are only VGA resolutio n. Not bitter. Not at all. Not even, well a bit pissed. If that will work I can say that I intended to use it that way all along.

 
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ArtF
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« Reply #6 on: February 20, 2020, 08:22:31 AM »

Hi:

  Clip will remove that back portion, think of it like slicing off the front. The rear most always gets stretched too far back
due to the poor  light you really get from monitors. That module is a fascinati ng look at how so little informati on from
minor light changes can be used to determine 3d coordinat es, unfortuna tely it takes a lot of playing with condition s
to get a good one.

  In the method Im playing with now, Im sending structure d light patterns to my projector through the second
monitor jack on my video card. Ive also added in the capabilit y to control a Canon camera. There are many related
methods to doing a structure d light projectio n method for 3d, from binary coding, gray code, fringe field and mixtures
of the three. Ive purchased a Canon rebel camera from ebay for 88 dollars that should be controlla ble from the
software.  I dont know how this method will work, but Im curious enough to code it up and see. My patterns look
good from this cheap projector, but a webcam seems to be terrible at doing a photo, hence the Canon camera...

   I hope to send very fast flashes of various images, take fast photos between each projectio n change,
and process it to get hi res 3d's of faces for laser 3d engraving . If it all works Ill add a button in Vexx to
allow anyone with a Canon camera and a projector of some sort to run it, though how many people fit
that category is highly questiona ble. Most Canon cameras will speak to software API's so Vexx has an
amazing amount of control over the camera.. if it all works as advertise d anyway..

  As you have interest in 3d imaging, Ill keep you posted on that projects progress.

 Smiley

Art


 
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