3DF Zephyr doesn't want to use photos

[DGHaZe]

Good afternoon, and I’ll immediately be angry for my English, as I am not its inhabitant and help myself with the help of a translator. I learned about this program from the Russian YouTube segment, and I liked the way of licensing it, so I settled on it. Sorry tightly tightened with the introduction. When using the program, I was faced with the same problem that it does not accept most of the pictures that I am taking.

I will immediately answer the question on the camera, I took pictures on the phone: xiaomi redmi 5 plus. And even as you can see, I printed a special platform which, according to my idea, was supposed to help the program but did not help (((. I also looked at the video lessons on the channel on this topic, did everything as indicated but did not help. Please help me deal with this issue.

P.S I think that perhaps this problem is connected with the focal distance. Since on my phone there is no way to adjust it precisely or set it manually.

[DGHaZe]

A couple of photos that I could upload here.

[cam3d]

Hi DGHaZe -

Welcome to the forum - To answer your question:

- Your subject (blue plastic) has a smooth featureless surface and is a bit shiny. These kinds of surfaces are very hard to construct using photogrammetry. As you are just starting out, it makes more sense to practice on a feature-rich subject first, such as a tree stump or a rock.

- Your special platform does not help Zephyr. The best way to help Zephyr orient cameras successfully is to use a feature-rich surface. Perlin noise (image attached) is a great example of a feature-rich surface.



- We have a series of video tutorials which I highly recommend to everyone, pro or beginner: https://www.3dflow.net/technology/do...hyr-tutorials/ along with extensive documentation: https://www.3dflow.net/technology/do...documentation/

I hope this was helpful to you! If you have specific questions that are not covered by our video tutorials or documentation, let us know and we can help guide you to the correct solutions.

[DGHaZe]

Thanks for the answer cam3d.

I watched half of the video with subtitles and calibrated the camera, but it didn’t help. Today I also went to a park in my city and took a couple of shots with manual camera settings, although I only have ISO and the type of lightning available for tuning. But this also did not help the program vomitingly refuses to take 95% of the photos. Riding another program takes 99% of all photos, but it has terrible functionality and the calculation is quite long. That's why I'm even trying to figure this one out. In the attachment, I will leave links to the archive with photos on the google disk. Maybe someone will look and explain why the problem.

P.S I took pictures of the sugar bowl at home, I already took a program of enough pictures, but still did the same to me.

Figured stone: https://drive.google.com/file/d/1xLo...ew?usp=sharing
Wooden man: https://drive.google.com/file/d/1OZn...ew?usp=sharing
Cat sugar bowl: https://drive.google.com/file/d/1xlM...ew?usp=sharing

[cam3d]

DGHaZe thanks for sharing those datasets - I'll download them and have a look

[cam3d]

On inspection of your datasets:

With the preset: General Deep Zephyr orients 32/34 images and create a full model of 'figured stone':



Using General Deep Zephyr orients 20/27 images of 'Wooden Man':



And finally, your 'Cat Sugar Bowl' with the same settings gets 13/27 images:




Things to note:

- Across all your datasets there appears to be sharpening applied to every image, this can cause issues with processing and is sometimes unavoidable when you are using a phone camera. It is recommended to use a DSLR or other fully controllable camera for the best results possible, however, I understand not everyone has access to a DLSR or equivalent hardware. It is harder to use a phone camera successfully, but not impossible.

- The Cat Sugar Bowl dataset has a very high ISO value (3200) This high ISO adds noise to the images which one of the root causes of orientation problems. Your dataset of the 'Figured Stone' which has a much lower ISO (200) which is giving higher quality images and therefore more reliable camera orientation.

- Some of your photographs (mostly in the Wooden Man dataset) are shot at 1/33 sec and have motion blur. This blur makes it much harder to orient cameras in 3D space. Again, looking back at the more successful 'Figured Stone' which has a faster shutter speed and minimal motion blur, and is more successful as a result of this.

- I recommend taking photographs outside on a bright day with cloud overhead. The brightness of the sun helps to give you low ISO and fast shutter speeds, while the cloud diffuses the light, reducing shadow and giving even lighting to the surface of your subject.


I hope this was informative - Please let me know if you have any further specific questions about the photogrammetry process.

[DGHaZe]

Thanks for the answer cam3d . I will mean more experimentation. I know what I’ll do on vacation now.

By the way, about what a beginner lacks for mastering your program, there is still not enough video about a mobile phone and a video about camera calibration. The change about camera calibration has and it is shown how to start this process, but why is it needed? I didn’t find the video.

Thanks for the tips and tricks, I hope I will soon be pleased with my scans.