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Reporting

OpenSfM commands write reports on the work done. Reports are stored in the reports folder in json format so that they can be loaded programatically. Here is the list of reports produced and the data included.

Feature detection

The report on feature detection is stored in the file features.json. Its structure is as follow:

{
    "wall_time": {{ total time compting features }},
    "image_reports": [   # For each image
        {
            "wall_time": {{ feature extraction time }},
            "image": {{ image name }},
            "num_features": {{ number of features }}
        },
        ...
    ]
}

Matching

The report on matching is stored in the file matches.json. Its structure is as follow:

{
    "wall_time": {{ total time compting matches }},
    "pairs": {{ list of candidate image pairs }}
    "num_pairs": {{ number of candidate image pairs }},
    "num_pairs_distance": {{ number of pairs selected based on distance }},
    "num_pairs_time": {{ number of pairs selected based on time }},
    "num_pairs_order": {{ number of pairs selected based on order }},
}

Create tracks

The report on tracks creation is stored in the file tracks.json. Its structure is as follow:

{
    "wall_time": {{ total time computing tracks }}
    "wall_times": {
        "load_features": {{ time loading features }},
        "load_matches": {{ time loading matches }},
        "compute_tracks": {{ time computing tracks }},
    },
    "num_images": {{ number of images with tracks }},
    "num_tracks": {{ number of tracks }},
    "view_graph": {{ number of image tracks for each image pair }}
}

Reconstruction

The report on the reconstruction process is stored in the file reconstruction.json. Its structure is as follow:

{
    "wall_times": {
        "compute_reconstructions": {{ time computing the reconstruction }},
        "compute_image_pairs": {{ time computing the candidate initial pairs }},
        "load_tracks_graph": {{ time loading tracks }}
    },
    "num_candidate_image_pairs": {{ number of candidate image pairs for initializing reconstructions }},
    "reconstructions": [  # For each reconstruction build
        {
            "bootstrap": {  # Initialization information
                "memory_usage": {{ memory usage at the end of the process }},
                "image_pair": {{ initial image pair }},
                "common_tracks": {{ number of common tracks of the image pair }},
                "two_view_reconstruction": {
                    "5_point_inliers": {{ number of inliers for the 5-point algorithm }},
                    "plane_based_inliers": {{ number of inliers for the plane based initialization }},
                    "method": {{ method used for initialization "5_point" or "plane_based" }}
                },
                "triangulated_points": {{ number of triangulated points }},
                "decision": {{ either "Success" or the reason for failure }},
            },
            "grow": {  # Incremental growth information
                "steps": [  # For every growth step
                    {
                        "image": {{ image name }},
                        "resection": {
                            "num_inliers": {{ number of inliers }},
                            "num_common_points": {{ number of reconstructed points visible on the new image }}
                        },
                        "triangulated_points": {{ number of newly triangulated points }},
                        "memory_usage": {{ memory usage after adding the image }},
                        "bundle": {
                            "wall_times": {
                                "setup": {{ time setting up bundle }},
                                "run": {{ time running bundle }},
                                "teardown": {{ time updating the values after bundle }},
                            },
                            "brief_report": {{ Ceres brief report }}
                        },
                    }
                ]
            }
        }
    ],
    "not_reconstructed_images": {{ images that could not be reconstructed }},
}