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"handedness_rows": [ { "handedness": "unknown", "len": 92 }, { "handedness": "right", "len": 3 }, { "handedness": "left", "len": 8 } ] }, "arkit_poses": { "rows": 3466, "source": "estimated", "estimator": "arkit:stray_scanner", "columns": { "t_s": "Float64", "tx": "Float64", "ty": "Float64", "tz": "Float64", "qx": "Float64", "qy": "Float64", "qz": "Float64", "qw": "Float64" }, "null_counts": { "t_s": 0, "tx": 0, "ty": 0, "tz": 0, "qx": 0, "qy": 0, "qz": 0, "qw": 0 }, "unique_timestamps": 3466 }, "frame_mapping": { "rows": 3466, "source": "measured", "estimator": "stray:explicit_frame_id", "columns": { "t_s": "Float64", "source_frame_index": "Int64", "video_pts_s": "Float64", "sensor_timestamp_s": "Float64", "sensor_t_s": "Float64", "rgb_decodable": "Boolean", "rgb_frame_index": "Int64" }, "null_counts": { "t_s": 0, "source_frame_index": 0, "video_pts_s": 0, "sensor_timestamp_s": 0, "sensor_t_s": 0, "rgb_decodable": 0, "rgb_frame_index": 1 }, "unique_timestamps": 3466 }, "camera_intrinsics": { "rows": 3466, "source": "measured", "estimator": "stray:device_calibration", "columns": { "t_s": "Float64", "source_frame_index": "Int64", "fx": "Float64", "fy": "Float64", "cx": "Float64", "cy": "Float64", "width": "Int64", "height": "Int64", "calibration_source": "String" }, "null_counts": { "t_s": 0, "source_frame_index": 0, "fx": 0, "fy": 0, "cx": 0, "cy": 0, "width": 0, "height": 0, "calibration_source": 0 }, "unique_timestamps": 3466 }, "device_imu": { "rows": 5810, "source": "measured", "estimator": "stray:raw_device_imu", "columns": { "sensor_timestamp_s": "Float64", "sensor_t_s": "Float64", "t_s": "Float64", "clock_mapping_valid": "Boolean", "a_x": "Float64", "a_y": "Float64", "a_z": "Float64", "alpha_x": "Float64", "alpha_y": "Float64", "alpha_z": "Float64" }, "null_counts": { "sensor_timestamp_s": 0, "sensor_t_s": 0, "t_s": 14, "clock_mapping_valid": 0, "a_x": 0, "a_y": 0, "a_z": 0, "alpha_x": 0, "alpha_y": 0, "alpha_z": 0 }, "unique_timestamps": 5796 } }, "annotation_accuracy": "not_independently_evaluated", "public_release_ready": true, "release_checks": { "license": "cc-by-4.0", "ownership": "owner_attested", "privacy_review": "automated_full_video_face_scan; sampled_visual_inspection; no_human_attestation", "annotation_review": "assistant_sampled_visual_review; independent_accuracy_not_measured", "technical_validation": "passed; see validation.json" }, "sensor_completeness": { "frame_mapping": 3466, "arkit_poses": 3466, "camera_intrinsics": 3466, "measured_depth_index": 3466, "device_imu": 5810, "rgb_frames": 3465, "displayed_rgb_frames": 3465, "frame_tables_match_rgb": true }, "warnings": [ "Annotation coverage is not an accuracy measurement.", "Device ARKit pose is a VIO estimate, not independent motion-capture ground truth.", "Raw device acceleration units require capture-version verification; no conversion applied.", "No robot commands, force, tactile measurements or execution success are provided." ], "hand_candidate_selection": { "candidates": 3176, "kept": 1638, "duplicate_groups": 1346, "label_conflicts": 1250, "max_hands": 2 }, "clock_mapping": { "method": "explicit_source_frame_id_with_discard_flags", "mapping_version": 2, "displayed_frame_count": 3465, "discarded_packet_count": 1, "time_domain": "rgb_pts_relative_to_first_frame", "frame_count": 3466, "max_original_clock_difference_ms": 86.05029166598399, "physical_sync_accuracy": "not_independently_measured" }, "internal_only_channels": [ "body_pose", "privacy", "measured_depth_index", "hand_pose_candidates" ], "release_scope": "public evaluation sample; estimated annotations experimental" }