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A Python script using the AIY Projects Vision Kit to turn a servo motor in the direction of detected face.
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#!/usr/bin/env python3 | |
import argparse | |
from aiy.vision.inference import CameraInference | |
from aiy.vision.models import face_detection | |
from aiy.vision.annotator import Annotator | |
from picamera import PiCamera | |
from gpiozero import Servo | |
from aiy.pins import PIN_A | |
def main(): | |
parser = argparse.ArgumentParser() | |
parser.add_argument( | |
'--num_frames', | |
'-n', | |
type=int, | |
dest='num_frames', | |
default=-1, | |
help='Sets the number of frames to run for, otherwise runs forever.') | |
args = parser.parse_args() | |
with PiCamera() as camera: | |
camera.sensor_mode = 4 | |
camera.resolution = (1640, 1232) | |
camera.framerate = 30 | |
camera.start_preview() | |
servo = Servo(PIN_A, min_pulse_width=.0005, max_pulse_width=.0019) | |
servo.mid() | |
position = 0 | |
annotator = Annotator(camera, dimensions=(320, 240)) | |
scale_x = 320 / 1640 | |
scale_y = 240 / 1232 | |
def transform(bounding_box): | |
x, y, width, height = bounding_box | |
return (scale_x * x, scale_y * y, scale_x * (x + width), | |
scale_y * (y + height)) | |
with CameraInference(face_detection.model()) as inference: | |
for i, result in enumerate(inference.run()): | |
if i == args.num_frames: | |
break | |
faces = face_detection.get_faces(result) | |
annotator.clear() | |
for face in faces: | |
annotator.bounding_box(transform(face.bounding_box), fill=0) | |
annotator.update() | |
print('Iteration #%d: num_faces=%d' % (i, len(faces))) | |
if faces: | |
face = faces[0] | |
x, y, width, height = face.bounding_box | |
print(' : Face is at %d' % x) | |
if x < 300: | |
print(' : Face left of center') | |
position = position + 0.1 | |
if position > 1: | |
position = 0.99 | |
elif x > 500: | |
print(' : Face right of center') | |
position = position - 0.1 | |
if position < -1: | |
position = -0.99 | |
else: | |
print(' : Face in CENTER of image') | |
positon = position | |
servo.value = position | |
else: | |
servo.mid() | |
position = 0 | |
camera.stop_preview() | |
if __name__ == '__main__': | |
main() |
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