{"schema_version":"1.0","purpose":"Compact complementary evidence for a VLM assessing exercise movement. Use together with the source video and an exercise-specific rubric.","metadata":{"fps":25.0,"duration_s":4.0,"rgb_size_pixels":[720,1280],"timepoint_coverage":{"requested_timepoint_count":101,"available_timepoint_count":101,"missing_timepoint_count":0,"available_timepoint_fraction":1.0},"spaces":{"2d_pixels":"Original RGB frame coordinates; origin top-left, +x right, +y down.","2d_image_fraction":"2D pixels divided by [image_width, image_height]; origin top-left.","3d_model":"SAM MHR camera-aligned body/model coordinates before camera translation; +x projects right, +y projects down, +z increases away from the camera.","3d_camera":"3d_model + pred_cam_t. Projection uses principal point [width/2, height/2] and focal_length in original-image pixels.","3d_root_relative_torso_units":"Per-frame mid-hip center subtracted from 3d_model, then divided by the segment median distance from mid-hip to mid-shoulder. Dimensionless.","angles":"Rotation/translation-invariant included 3D angle at the middle joint. A straight elbow or knee is approximately 180 degrees; conventional flexion is approximately 180 minus this value."},"representative_timepoint_ordered_fields":{"keypoints":["nose","neck","left_shoulder","right_shoulder","left_elbow","right_elbow","left_wrist","right_wrist","left_hip","right_hip","left_knee","right_knee","left_ankle","right_ankle","left_heel","right_heel","left_big_toe","right_big_toe"],"joint_included_angles_3d_deg":["left_elbow","right_elbow","left_knee","right_knee","left_hip","right_hip","left_shoulder","right_shoulder","left_ankle","right_ankle"],"alignment":["left_knee_line_deviation_torso","left_elbow_line_deviation_torso","right_knee_line_deviation_torso","right_elbow_line_deviation_torso","shoulder_line_tilt_abs_image_deg","pelvis_line_tilt_abs_image_deg","trunk_lateral_offset_image_torso","head_over_pelvis_offset_image_torso","left_knee_ankle_horizontal_offset_image_torso","right_knee_ankle_horizontal_offset_image_torso"],"contact_likelihood_and_likely":["left_foot","right_foot","left_hand","right_hand"]},"representative_timepoint_selection":"Segment endpoints, dominant-angle minimum/maximum, and evenly spaced timepoints."},"segment_summary":{"range_of_motion":{"joint_angles_3d":{"left_elbow_included_angle_deg":{"start":156.428,"end":165.403,"min":152.232,"min_time_s":1.48,"max":175.149,"max_time_s":1.08,"range":22.917,"mean":162.629,"median":164.76},"right_elbow_included_angle_deg":{"start":160.984,"end":161.796,"min":154.251,"min_time_s":0.28,"max":164.9,"max_time_s":2.32,"range":10.649,"mean":160.481,"median":161.441},"left_knee_included_angle_deg":{"start":175.168,"end":173.905,"min":173.005,"min_time_s":3.96,"max":179.628,"max_time_s":0.76,"range":6.623,"mean":176.771,"median":177.364},"right_knee_included_angle_deg":{"start":174.912,"end":170.558,"min":170.263,"min_time_s":3.96,"max":179.117,"max_time_s":0.92,"range":8.853,"mean":174.673,"median":174.87},"left_hip_included_angle_deg":{"start":167.387,"end":56.717,"min":55.776,"min_time_s":3.28,"max":167.533,"max_time_s":0.04,"range":111.757,"mean":91.831,"median":76.695},"right_hip_included_angle_deg":{"start":161.368,"end":56.945,"min":56.173,"min_time_s":3.68,"max":161.692,"max_time_s":0.04,"range":105.519,"mean":90.529,"median":75.437},"left_shoulder_included_angle_deg":{"start":23.48,"end":95.84,"min":20.423,"min_time_s":0.4,"max":97.917,"max_time_s":3.28,"range":77.494,"mean":64.039,"median":72.684},"right_shoulder_included_angle_deg":{"start":22.566,"end":97.295,"min":20.576,"min_time_s":0.44,"max":97.662,"max_time_s":3.92,"range":77.086,"mean":64.328,"median":74.69},"left_ankle_included_angle_deg":{"start":98.817,"end":114.275,"min":98.817,"min_time_s":0.0,"max":117.231,"max_time_s":1.56,"range":18.414,"mean":111.575,"median":112.669},"right_ankle_included_angle_deg":{"start":97.544,"end":112.977,"min":97.544,"min_time_s":0.0,"max":115.831,"max_time_s":1.28,"range":18.287,"mean":111.359,"median":112.334}},"normalized_distances_3d":{"ankle_separation_torso":{"start":0.372,"end":0.402,"min":0.347,"min_time_s":0.4,"max":0.458,"max_time_s":1.2,"range":0.11,"mean":0.414,"median":0.417},"knee_separation_torso":{"start":0.353,"end":0.371,"min":0.331,"min_time_s":0.4,"max":0.388,"max_time_s":1.88,"range":0.058,"mean":0.373,"median":0.377},"wrist_separation_torso":{"start":1.108,"end":0.566,"min":0.502,"min_time_s":3.0,"max":1.108,"max_time_s":0.0,"range":0.606,"mean":0.687,"median":0.65},"shoulder_width_torso":{"start":0.674,"end":0.701,"min":0.672,"min_time_s":0.08,"max":0.73,"max_time_s":1.76,"range":0.058,"mean":0.705,"median":0.704},"pelvis_width_torso":{"start":0.31,"end":0.308,"min":0.307,"min_time_s":1.08,"max":0.318,"max_time_s":1.96,"range":0.01,"mean":0.311,"median":0.31}}},"alignment":{"left_knee_line_deviation_torso":{"start":0.036,"end":0.046,"min":0.003,"min_time_s":0.76,"max":0.053,"max_time_s":3.24,"range":0.05,"mean":0.024,"median":0.02},"left_elbow_line_deviation_torso":{"start":0.116,"end":0.074,"min":0.024,"min_time_s":1.08,"max":0.138,"max_time_s":1.48,"range":0.113,"mean":0.087,"median":0.078},"right_knee_line_deviation_torso":{"start":0.038,"end":0.071,"min":0.007,"min_time_s":0.92,"max":0.073,"max_time_s":3.96,"range":0.067,"mean":0.04,"median":0.038},"right_elbow_line_deviation_torso":{"start":0.094,"end":0.092,"min":0.078,"min_time_s":2.12,"max":0.125,"max_time_s":0.28,"range":0.047,"mean":0.098,"median":0.095},"shoulder_line_tilt_abs_image_deg":{"start":82.452,"end":51.755,"min":0.079,"min_time_s":0.52,"max":82.452,"max_time_s":0.0,"range":82.373,"mean":32.979,"median":35.914},"pelvis_line_tilt_abs_image_deg":{"start":43.247,"end":56.432,"min":43.247,"min_time_s":0.0,"max":89.589,"max_time_s":0.52,"range":46.341,"mean":62.979,"median":60.397},"trunk_lateral_offset_image_torso":{"start":0.192,"end":0.942,"min":0.192,"min_time_s":0.0,"max":1.0,"max_time_s":1.96,"range":0.808,"mean":0.821,"median":0.937},"head_over_pelvis_offset_image_torso":{"start":0.653,"end":1.093,"min":0.653,"min_time_s":0.04,"max":1.356,"max_time_s":1.36,"range":0.703,"mean":1.115,"median":1.099},"left_knee_ankle_horizontal_offset_image_torso":{"start":0.07,"end":0.117,"min":0.0,"min_time_s":0.48,"max":0.163,"max_time_s":1.68,"range":0.163,"mean":0.104,"median":0.106},"right_knee_ankle_horizontal_offset_image_torso":{"start":0.076,"end":0.063,"min":0.005,"min_time_s":0.56,"max":0.127,"max_time_s":1.56,"range":0.122,"mean":0.074,"median":0.064}},"tempo":{"dominant_motion_signal":"left_hip_included_angle_deg","dominant_signal_robust_range_deg":108.95,"duration_s":4.0,"mean_abs_angular_speed_deg_s":27.81,"peak_abs_angular_speed_deg_s":71.37,"meaningful_reversal_count":0,"estimated_complete_cycles":null,"median_cycle_duration_s":null,"phase_events":[],"caution":"A null cycle count means the segment does not contain enough repeated same-type extrema; it must not be interpreted as zero exercise repetitions."},"stability":{"joint_high_frequency_residual_torso_mean":0.007,"joint_high_frequency_residual_torso_p95":0.0178,"root_relative_joint_speed_torso_per_s_mean":0.278,"root_relative_joint_speed_torso_per_s_p95":0.939,"trunk_center_lateral_sway_torso_std":0.2392,"camera_translation_step_torso_median":0.0236,"camera_translation_step_torso_p95":0.0726,"median_bone_length_cv":0.01472,"abrupt_pose_step_count":0},"symmetry":{"angle_symmetry":{"elbow_left_right_abs_difference_deg":{"start":4.557,"end":3.607,"min":0.036,"min_time_s":0.08,"max":17.588,"max_time_s":1.08,"range":17.553,"mean":3.778,"median":3.002},"knee_left_right_abs_difference_deg":{"start":0.256,"end":3.347,"min":0.011,"min_time_s":0.24,"max":4.204,"max_time_s":1.96,"range":4.192,"mean":2.183,"median":2.5},"hip_left_right_abs_difference_deg":{"start":6.019,"end":0.229,"min":0.002,"min_time_s":2.52,"max":6.019,"max_time_s":0.0,"range":6.017,"mean":1.699,"median":1.021},"shoulder_left_right_abs_difference_deg":{"start":0.915,"end":1.455,"min":0.025,"min_time_s":1.32,"max":3.625,"max_time_s":1.48,"range":3.6,"mean":1.041,"median":0.817},"ankle_left_right_abs_difference_deg":{"start":1.273,"end":1.299,"min":0.01,"min_time_s":1.2,"max":3.472,"max_time_s":2.12,"range":3.462,"mean":0.868,"median":0.86}},"estimated_limb_length_difference_torso_median":{"upper_arm":0.0029,"forearm":0.0011,"thigh":0.0,"shin":0.0026},"interpretation":"These are descriptive left-right differences. Asymmetry may be intentional for unilateral exercises and is not a correctness score."},"ground_contact_cues":{"effectors":{"left_foot":{"mean_likelihood":0.74,"max_likelihood":0.917,"likely_fraction":0.851,"likely_time_intervals_s":[[0.12,1.0],[1.12,1.4],[1.6,1.72],[1.8,1.92],[2.0,2.08],[2.2,3.16],[3.28,4.0]]},"right_foot":{"mean_likelihood":0.863,"max_likelihood":0.984,"likely_fraction":1.0,"likely_time_intervals_s":[[0.0,4.0]]},"left_hand":{"mean_likelihood":0.228,"max_likelihood":0.564,"likely_fraction":0.0,"likely_time_intervals_s":[]},"right_hand":{"mean_likelihood":0.271,"max_likelihood":0.658,"likely_fraction":0.04,"likely_time_intervals_s":[[3.68,3.8]]}},"method":"Heuristic likelihood from temporal stillness in image and camera 3D plus proximity to an estimated foot-floor image line.","required_interpretation":"This is not force, pressure, collision, or semantic floor detection. The VLM must verify contact in the source video."},"quality":{"mean_keypoints_in_frame_fraction":1.0,"bbox_edge_touch_fraction":0.0,"mean_internal_reprojection_error_px":3.9e-05,"abrupt_pose_step_times_s":[],"abrupt_pose_step_interpretation":"These timepoints contain an unusually large pose change relative to the segment. It may be real fast motion or an estimation jump.","confidence_limitation":"The export contains no detector or per-joint confidence values. Internal reprojection consistency is not an accuracy 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the matching moments in the source video.","Use range_of_motion, alignment, symmetry, and tempo as complementary measurements.","Use normalized 3D keypoints to resolve depth ambiguity in RGB.","Check quality and contact limitations before making a correctness judgment.","Apply the separate exercise-specific rubric; these features do not label correct/incorrect."]}