| Detection |
One box a detector reports for one frame: top-left x, y, width, height, a score and a label, as sushitrack_object_t |
| Track |
What the tracker reports for one object in one frame, as sushitrack_track_t |
| Tracklet |
The tracker’s internal record of one object across frames: estimator state, lifecycle state and feature history (Tracklet) |
| Track state |
The lifecycle state of a tracklet: New, Tracked, Lost, Removed or Tentative |
| Tentative |
A new track that is not yet confirmed; it needs tentative_confirm_hits matches before it is promoted |
| Lost buffer |
The period a lost track is kept before removal: track_buffer frames, or track_buffer / frame_rate seconds when time_aware=1 |
| Two-stage association |
The ByteTrack scheme: detections at or above track_thresh are matched first, then the tracks left over try the low-score detections |
| Primary stage, secondary stage |
The first and second pass of two-stage association |
| Cost calculator |
An ICostCalculator; it fills the matrix of pairwise costs between tracks and detections |
| IoU, DIoU, GIoU, SIoU |
The four overlap measures iou_type selects for the primary and secondary stages |
| LAPJV |
The Jonker-Volgenant algorithm for the linear assignment problem, used by LAPJVSolver |
| Gate |
A test that removes a track and detection pair from association before the solver runs |
| Mahalanobis gating |
A gate on the chi-squared distance between a detection and the track’s predicted box, switched by enable_mahalanobis |
| NSA |
Noise-scale-adaptive Kalman filter, kalman_type=1; it scales measurement noise by detection confidence |
| IMM |
Interacting Multiple Model estimator, kalman_type=2; it runs four motion models and mixes them by mode probability |
| Kinematic state |
The motion regime the IMM reports for a track: Stationary, Cruising, Maneuvering or Coasting |
| Maneuver probability |
The IMM probability mass on the manoeuvring models, reported per track as maneuver_probability |
| OCM |
Observation-centric momentum, enable_ocm; it re-ranks primary costs by the direction a track was observed to travel |
| VDC |
Velocity direction consistency, the OC-SORT term OCM applies, bounded by ocm_vdc_weight |
| ORU |
Observation-centric re-update, enable_oru; on recovery it rolls the estimator back and replays the gap along a straight line |
| ReID |
Appearance matching on a feature vector supplied with each detection, switched by enable_reid |
| TLWH, XYAH |
The two box states of the Kalman filter: top-left, width, height; or centre, aspect ratio, height (enable_xyah) |
| Time-aware |
time_aware=1; dt is real seconds and expiry is measured in wall-clock time |
| Timing policy |
An ITimingPolicy; it turns dt into filter steps and decides when a track expires |
| C ABI |
The binary interface of include/SushiTrack/sushitrack_c.h: the sushitrack_* functions and structs |
| Binding |
bindings/python/sushitrack.py, the ctypes wrapper over the C ABI |
| Reference tracker |
ByteTrack or OC-SORT as vendored under third_party/, built only to compare against |
| Adapter |
An ITrackerAdapter in tests/regression/; it drives one tracker through the common harness |
tracker_bridge |
The shared library built from tests/regression/TrackerRegistry.cpp; the inference pipeline loads the reference trackers through it |
| Scenario |
One sequence the regression binary runs, registered in tests/regression/ScenarioList.h |
| Sequence |
One folder under tests/regression/evaluator/data/ with det/det.txt, gt/gt.txt and seqinfo.ini |
| Suite |
A CTest label group st test --suite selects: unit, integration, regression, functional or all |
| Private, public detections |
In st eval, the -YOLOX sequences and the other MOT sequences |
| TrackEval |
The MOTChallenge evaluator under third_party/TrackEval; it computes HOTA, CLEAR and Identity metrics |
| HOTA, DetA, AssA |
Higher-order tracking accuracy and its detection and association parts |
| MOTA, IDF1, IDSW |
The CLEAR accuracy, the identity F1 score and the count of identity switches |
| Deploy package |
The package/ tree st deploy assembles for a consumer outside this repository |
st |
The developer CLI of this repository, also installed as sushitrack |
sushicore |
The Sushi Systems package that gives every Sushi CLI its console, configuration layering and build driver |
