Error when calling openMVG_main_evalQuality: "The input SfM_Data file "/path/to/sfm_data.json" cannot be read."

[biesseck]

I got the following error message when running EvaluationLauncher.py: "The input SfM_Data file "/path/to/sfm_data.json" cannot be read.".

In line 98 of this python script "outGlobal_dir" is passed as argument to openMVG_main_evalQuality program, but "matches_dir" should be used because "sfm_data.json" file is stored in "/path/to/SfM_quality_evaluation/Benchmarking_Camera_Calibration_2008_out/evaluation_output/fountain-P11/matching" directory. For my understanding the line 98 should be written as

command = command + " -c " + matches_dir + "/sfm_data.json"

instead of

command = command + " -c " + outGlobal_dir + "/sfm_data.json"

Hope this helps!

[pmoulon]

Hi @biesseck
Thank you for your feedback.
I just tried back on my side and your right I did not update this script for OpenMVG v1.x

You must change the line:
https://github.com/openMVG/SfM_quality_evaluation/blob/master/EvaluationLauncher.py#L89
from command = command + " -f 0" # Do not refine intrinsics
to
command = command + " -f NONE" # Do not refine intrinsics

and the line https://github.com/openMVG/SfM_quality_evaluation/blob/master/EvaluationLauncher.py#L98
from command = command + " -c " + outGlobal_dir + "/sfm_data.json"
to
command = command + " -c " + outGlobal_dir + "/sfm_data.bin"

And it will work.