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There is a list of targets that Nao can track using the Naoqi Tracker API, which works well under good lighting conditions. Here is a walkthrough on how to track a face with its head and a red ball with its arms.

Track a face with Nao’s head

  1. First, import the necessary functions from the SIC framework:

from sic_framework.devices import Nao
from sic_framework.devices.common_naoqi.naoqi_stiffness import Stiffness
from sic_framework.devices.common_naoqi.naoqi_tracker import (
    RemoveTargetRequest,
    StartTrackRequest,
    StopAllTrackRequest,
)

  1. Connect to the Nao (computer must be connected to the same network)

nao = Nao(ip="NAO_IP_HERE")

  1. Set a tracking target, a list of available targets can be found here: http://doc.aldebaran.com/2-5/naoqi/trackers/index.html#target-names 

target_name = "Face"

  1. Since we want to use the head to track a face, we need to set the stiffness to 1 to enable the motors to control the head joint

nao.stiffness.request(Stiffness(stiffness=1.0, joints=["Head"]))

  1. Start tracking, the size is the diameter of the target and a list of available modes can be found here: http://doc.aldebaran.com/2-5/naoqi/trackers/index.html#tracking-modes 

nao.tracker.request(StartTrackRequest(target_name, size=0.2, mode="Head", effector="None"))

  1. Unregister a target

nao.tracker.request(RemoveTargetRequest(target_name))

Track a red ball with Nao’s arms

  1. Set a new target

target_name = "RedBall"

  1. Set a robot position relative to target. This is only needed in Move mode. The parameters represent [coordX, coordY, coordWz, thresholdX, thresholdY, thresholdWz]. In this case, it sets the target ball to be 30 cm away along the x-axis with a 10 cm threshold. The XYZ frame reference for the robot can be found here position-identification 

move_rel_position = [-0.3, 0.0, 0.0, 0.1, 0.1, 0.1]

  1. Track a red ball

nao.tracker.request(
    StartTrackRequest(
        target_name=target_name,
        size=0.06,
        mode="Move",
        effector="Arms",
        move_rel_position=move_rel_position,
    )
)

4. Stop all tracking. This will put the robot into rest mode, unlocking all joints and setting stiffness to 0

nao.tracker.request(StopAllTrackRequest())

A complete script for this tutorial can be found here: demo_nao_tracker.py

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