Openmvg: error: no image using camera 0 of platform 0

[945540968]

After using SFM pipeline, we want to transform the output into openMVS. But we came across a problem like this:

C:\openMVS\build\openMVG\Windows-AMD64-Release\Debug>openMVG_main_openMVG2openMVS -i C:/openMVS/build/openMVG/software/SfM/test_result/matches/sfm_data.json -d C:/Users/lzj/Desktop/MVS -o C:/Users/lzj/Desktop/MVS/scene.mvs

0% 10 20 30 40 50 60 70 80 90 100%
|----|----|----|----|----|----|----|----|----|----|

---

error: no image using camera 0 of platform 0
Scene saved to OpenMVS interface format:
22 images (0 calibrated)
0 Landmarks

OMG! We have spent two weeks on solving the problem, can you help us? we'll be very grateful!

[pmoulon]

The problem is that you are providing to the binary a sfm_data json that does not contains any camera poses.

the matches/sfm_data.json contains only the View and Intrinsic data.
Please use the sfm_data.bin that is stored in the SfM reconstruction directory (the one processed with Incremental or Global SfM)

[945540968]

Hi, pmoulon, thanks for your solution. But when i use sfm_data.bin, the error still remains. Only the Landmarks increases from 0 to 2885. I'm looking forward to your reply.

C:\openMVS\build\openMVG\Windows-AMD64-Release\Debug>openMVG_main_openMVG2openMVS -i C:/openMVS/build/openMVG/software/SfM/test_result/reconstruction_global/sfm_data.bin -d C:/Users/lzj/Desktop/MVS -o C:/Users/lzj/Desktop/MVS/scene.mvs

0% 10 20 30 40 50 60 70 80 90 100%
|----|----|----|----|----|----|----|----|----|----|

---

error: no image using camera 0 of platform 0
Scene saved to OpenMVS interface format:
22 images (0 calibrated)
2885 Landmarks

[pmoulon]

Can you share your sfm_data.bin file?

[945540968]

Of course, wait a minute please.

[945540968]

sfm_data.zip

[pmoulon]

After investigation I think it's because the images cannot be reached.

What I suggest you to do is the following:

• use full_path if you can.
  Here a way to update the full_path for the image directory:
  -> openMVG_main_ConvertSfM_DataFormat -i sfm_data.bin -o sfm_data.json
  Then edit the field "root_path": "test_image", to have the full_path where your image is and run again openMVG_main_openMVG2openMVS on your updated sfm_data.json

I will update the binary with an error message to display that the image corresponding to the view is not accessible.

[pmoulon]

The patch that will display you the appropriate message is now pushed to the develop branch.

[945540968]

Hi, pmoulon, thanks for your solution, but i can't understand all of what you said. My steps are as follows:
(I use full_path stands for C:/openMVS/build/openMVG/software/SfM, because it's too long)

1. python SfM_GlobalPipeline.py full_path/test_image full_path/test_result
2. openMVG_main_ConvertSfM_DataFormat -i full_path/test_result/reconstruction_global/sfm_data.bin -o full_path/test_result/matches/sfm_data.json
3. openMVG_main_openMVG2openMVS -i full_path/test_result/matches/sfm_data.json -d C:/MVS -o C:/MVS/scene.mvs
   And then, the program died here.
   

I have two questions as follows:

1. How can i "edit the field "root_path": "test_image"" as you said.
2. I see you just update the src/software/SfM/main_openMVG2openMVS.cpp. Is that means i need compile the openMVG again?

I known maybe my questions is silly, Can you help me?.

[945540968]

As you say, lacking the full_path of test_image is the reason of my issue. But why the program run failed again after i use python SfM_GlobalPipeline.py full_path/test_image full_path/test_result?

[pmoulon]

The pipeline should not fails with full_path.
Can you elaborate to tell me which part is not working?

On my computer I tried python SfM_GlobalPipeline.py ./ImageDataset_SceauxCastle/images/ ./reconstruction_foo and everything ran fine.

[945540968]

python SfM_GlobalPipeline.py full_path/test_image full_path/test_result run success.
but openMVG_main_openMVG2openMVS -i full_path/test_result/matches/sfm_data.json -d C:/MVS -o C:/MVS/scene.mvs run faild. The progress bar is always 0%.

[pmoulon]

Please, note that you did not use a sfm_data json that contains camera poses!
The matches/sfm_data.json contains only Views and Intrinsics information.

Please use the sfm_data.bin produced in full_path/test_result/reconstruction_global/sfm_data.bin

[Datoow]

WOW， I have got the same problem，willing to watch how to solve it....

[pmoulon]

Please note that there is no problem:
1- Please use full path
2- Be sure that you are using a sfm_data that contains camera poses and structure (sfm_data.bin)

[945540968]

Now i run two program as follows:

Now The progress bar is in 30% after spending 10 minute, is it normal?

[945540968]

Dear pmoulon, thanks for your patience. Thank you very much!!

[945540968]

This problem has been solved! :)

[pmoulon]

Picture undistortion is not yet run in parallel but you can help on that ;-)

Please, can you close the issue?