ERROR: [main_ComputeSfM_DataColor.cpp:69] The input SfM_Data file "/content/openMVG/result/reconstruction_sequential/sfm_data.bin" cannot be read about openmvg HOT 4 OPEN

Thank you for posting here. See that step 4 did not provided meaningful match. It is most likely that your camera model is not in the sensor database we have. You can use "-f value" on SfM init image listing to set a focal prior for your dataset. You can set the value as 1.2 * max(width, height) of the image. Let me know how it goes. We are here to help!

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Can you specify where should we add this -f value, which command or which place in the source code? I am having the same exact error but by logs are like this -

Using input dir : /home/megumi/saatvik/SphereGlue/images
output_dir : /home/megumi/saatvik/SphereGlue/images_mvg_sfm_incremental

1. Intrinsics analysis
   INFO: [main_SfMInit_ImageListing.cpp:197] You called : /home/megumi/saatvik/openMVG_Build/Linux-x86_64-RELEASE/openMVG_main_SfMInit_ImageListing
   --imageDirectory /home/megumi/saatvik/SphereGlue/images
   --sensorWidthDatabase /home/megumi/saatvik/openMVG/src/software/SfM/../../openMVG/exif/sensor_width_database/sensor_width_camera_database.txt
   --outputDirectory /home/megumi/saatvik/SphereGlue/images_mvg_sfm_incremental/matches
   --focal -1
   --intrinsics
   --camera_model 3
   --group_camera_model 1
   --use_pose_prior 0
   --prior_weights 1.0;1.0;1.0
   --gps_to_xyz_method 0
   INFO: [loggerprogress.hpp:79] [- Listing images -] 100%
   INFO: [main_SfMInit_ImageListing.cpp:478] SfMInit_ImageListing report:
   listed #File(s): 3
   usable #File(s) listed in sfm_data: 3
   usable #Intrinsic(s) listed in sfm_data: 0
2. Compute features
   INFO: [main_ComputeFeatures.cpp:120] You called :
   /home/megumi/saatvik/openMVG_Build/Linux-x86_64-RELEASE/openMVG_main_ComputeFeatures
   --input_file /home/megumi/saatvik/SphereGlue/images_mvg_sfm_incremental/matches/sfm_data.json
   --outdir /home/megumi/saatvik/SphereGlue/images_mvg_sfm_incremental/matches
   --describerMethod SIFT
   --upright 0
   --describerPreset NORMAL
   --force 0
   --numThreads 0

INFO: [loggerprogress.hpp:79] [- EXTRACT FEATURES -] 100%
INFO: [main_ComputeFeatures.cpp:343] Task done in (s): 0
3. Compute matching pairs
You called:
/home/megumi/saatvik/openMVG_Build/Linux-x86_64-RELEASE/openMVG_main_PairGenerator
--input_file : /home/megumi/saatvik/SphereGlue/images_mvg_sfm_incremental/matches/sfm_data.json
--output_file : /home/megumi/saatvik/SphereGlue/images_mvg_sfm_incremental/matches/pairs.bin
Optional parameters
--pair_mode : EXHAUSTIVE
--contiguous_count : -1
Loading scene.Computing pairs.
Saving pairs.

4. Compute matches
   INFO: [main_ComputeMatches.cpp:113] You called :
   /home/megumi/saatvik/openMVG_Build/Linux-x86_64-RELEASE/openMVG_main_ComputeMatches
   --input_file /home/megumi/saatvik/SphereGlue/images_mvg_sfm_incremental/matches/sfm_data.json
   --output_file /home/megumi/saatvik/SphereGlue/images_mvg_sfm_incremental/matches/matches.putative.bin
   --pair_list /home/megumi/saatvik/SphereGlue/images_mvg_sfm_incremental/matches/pairs.bin
   Optional parameters:
   --force 0
   --ratio 0.8
   --nearest_matching_method AUTO
   --cache_size unlimited
   --preemptive_feature_used/count 0 / 200
   INFO: [loggerprogress.hpp:79] [- Regions Loading -] 100%
   INFO: [main_ComputeMatches.cpp:216] - PUTATIVE MATCHES -
   INFO: [main_ComputeMatches.cpp:225] PREVIOUS RESULTS LOADED; #pair: 3
   INFO: [main_ComputeMatches.cpp:365] #Putative pairs: 3
   INFO: [graph_stats.hpp:53] Graph statistics:
   #nodes: 3
   #cc: 1
   #singleton: 0
   Node degree statistics: min: 2, max: 2, mean: 2, median: 2

5. Filter matches
   INFO: [main_GeometricFilter.cpp:131] You called :
   /home/megumi/saatvik/openMVG_Build/Linux-x86_64-RELEASE/openMVG_main_GeometricFilter
   --input_file: /home/megumi/saatvik/SphereGlue/images_mvg_sfm_incremental/matches/sfm_data.json
   --matches: /home/megumi/saatvik/SphereGlue/images_mvg_sfm_incremental/matches/matches.putative.bin
   --output_file: /home/megumi/saatvik/SphereGlue/images_mvg_sfm_incremental/matches/matches.f.bin
   Optional parameters:
   --input_pairs
   --output_pairs
   --force false
   --geometric_model f
   --guided_matching 0
   --cache_size unlimited
   INFO: [loggerprogress.hpp:79] [- Regions Loading -] 100%
   INFO: [graph_stats.hpp:53] Graph statistics:
   #nodes: 3
   #cc: 1
   #singleton: 0
   Node degree statistics: min: 2, max: 2, mean: 2, median: 2
   INFO: [main_GeometricFilter.cpp:383] Task done in (s): 0
   INFO: [main_GeometricFilter.cpp:386]
   Export Adjacency Matrix of the pairwise's geometric matches

6. Do Sequential/Incremental reconstruction
   INFO: [main_SfM.cpp:157]

Structure from Motion:

INFO: [loggerprogress.hpp:79] [- Features Loading -] 100%
INFO: [sequential_SfM.cpp:278] Track building
INFO: [sequential_SfM.cpp:281] Track filtering
INFO: [sequential_SfM.cpp:283] Track export to internal struct
INFO: [sequential_SfM.cpp:309]

-- Tracks Stats --
Tracks number: 125
Images Id:
0, 1, 2,

TrackLength, Occurrence
2 111
3 14
ERROR: [sequential_SfM.cpp:110] Unable to choose an initial pair, since there is no defined intrinsic data.
INFO: [sequential_SfM.cpp:173] Cannot find a valid initial pair - stop reconstruction.

7. Colorize Structure
   ERROR: [main_ComputeSfM_DataColor.cpp:69] The input SfM_Data file "/home/megumi/saatvik/SphereGlue/images_mvg_sfm_incremental/reconstruction_sequential/sfm_data.bin" cannot be read.

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@saatvikmah if you use sphereglue you most likely intend to use panoramic images and so most likely need to setup the camera model to be panoramic/spherical.

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Where? to set the camera model

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