servo-tracking

# Vision Tracking ## Quick Start Tracks and follows any object by name. YOLOWorld detects the object in the camera frame, TrackerVit follows it in real-time with servo movement. ## Workflow 1. User names an object to track. 2. **If the user also hints at a direction** ("look at desk and follow cup", "point at the table and watch the phone"), fire `/servo/aim` FIRST so the camera is pointing at the right region before YOLO detection runs. Then fire `/servo/track`. The aim should complete in ~2s before the track call takes over. 3. Prefix reply with `[HW:/servo/track:{"target":["<label1>","<label2>"]}]` — the device detects and follows. - `target` accepts a list of candidate labels. Pass 2-4 synonyms/variants to maximise the chance YOLOWorld finds the object on the first try. - A single string also works (`{"target":"cup"}`) for backward compatibility, but the list form is preferred when the object could reasonably have multiple names. 4. To stop, prefix with `[HW:/servo/track/stop:{}]`. ## Examples **Input:** "Look at the desk and follow the cup" **Output:** `[HW:/servo/aim:{"direction":"desk"}][HW:/servo/track:{"target":["cup","mug","coffee cup"]}]` Looking at the desk and locking onto the cup. **Input:** "Point at the table and track my phone" **Output:** `[HW:/servo/aim:{"direction":"desk"}][HW:/servo/track:{"target":["phone","smartphone","mobile phone"]}]` Aimed at the table, tracking your phone. **Input:** "Follow the cup" **Output:** `[HW:/servo/track:{"target":["cup","mug","coffee cup"]}]` OK, following the cup! **Input:** "Look at the bottle" **Output:** `[HW:/servo/track:{"target":["bottle","water bottle","plastic bottle"]}]` Watching the bottle. **Input:** "Track that person" **Output:** `[HW:/servo/track:{"target":["person","man","woman"]}]` Following them now. **Input:** "Watch my phone" **Output:** `[HW:/servo/track:{"target":["phone","smartphone","mobile phone"]}]` Got it, tracking your phone. **Input:** "Follow the teddy bear" **Output:** `[HW:/servo/track:{"target":["teddy bear","stuffed animal","plush toy"]}]` Tracking the teddy bear! **Input:** "Stop following" / "Stop tracking" **Output:** `[HW:/servo/track/stop:{}]` Stopped tracking. **Input:** "What can you track?" **Output:** I can track most common objects — cups, bottles, phones, laptops, books, people, bags, and more. Just tell me what to follow! ## How to Control Tracking **No exec/curl needed.** Inline markers at start of reply: ``` [HW:/servo/track:{"target":["cup","mug","coffee cup"]}] Following the cup. [HW:/servo/track:{"target":["person"]}] Tracking you now. [HW:/servo/track/stop:{}] Stopped tracking. ``` ### Target names Prefer a **list of 2-4 candidate labels** in English. YOLOWorld evaluates all candidates and picks the highest-confidence detection across the set — synonyms increase the chance of a successful first-try detection when the user's wording doesn't exactly match COCO/training vocabulary. Common objects: person, cup, bottle, glass, phone, laptop, keyboard, mouse, book, pen, notebook, bag, chair, monitor, remote control, plate, bowl, plant, vase, clock, lamp, speaker, headphones, watch, glasses, hat, shoe, toy, ball, teddy bear. Any label works (open-vocabulary detection). Don't include too many unrelated items in the list — that risks matching a nearby but wrong object. ### How it works internally 1. Camera captures current frame 2. YOLOWorld API evaluates all candidate labels (~1-2s) 3. Highest-confidence detection becomes the initial bbox 4. TrackerVit locks on and follows in a move-then-freeze loop (~7 FPS) 5. Servo base_yaw + base_pitch nudges to keep object centered 6. Auto-stops when object is lost, out of range, or after 5 minutes ## Error Handling - If the object is not found: "I can't see a {target} right now. Try pointing me toward it, or try a different name." - If tracking stops unexpectedly: "I lost the {target}. Want me to try again?" - If servo is not available: "Servo is not available right now." ## Rules - Only one object can be tracked at a time. Starting a new track stops the previous one. - Tracking auto-stops when the object leaves the frame, gets occluded, or after 5 minutes. - When tracking stops, the servo holds its last position (no snap back to idle). - Do NOT use this for emotional reactions — use the Emotion skill instead. - Prefer `target` as a list of 2-4 English synonyms for better first-try detection. Avoid packing unrelated labels into the list.