face_tracking.py

import djitellopy as tello
#import KeyPressModule as kp
import time
import cv2
import numpy as np

#kp.init()

drone = tello.Tello()

drone.connect()

print(drone.get_battery())

drone.streamon()

drone.takeoff()
drone.send_rc_control(0, 0, 30, 0)
time.sleep(1)

w, h = 360, 240

fbRange = [6200, 6800]

pid = [0.6, 0.6, 0]

pError = 0

def findFace(img):
    faceCascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')
    imgGray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
    faces = faceCascade.detectMultiScale(imgGray, 1.2, 8)

    myFaceListC = []
    myFaceListArea = []

    for (x, y, w, h) in faces:
        cv2.rectangle(img, (x, y), (x + w, y + h), (0, 0, 255), 2)
        cx = x + w // 2
        cy = y + h // 2
        area = w * h
        cv2.circle(img, (cx, cy), 5, (0, 255, 0), cv2.FILLED)
        myFaceListC.append([cx, cy])
        myFaceListArea.append(area)
    if len(myFaceListArea) != 0:
        i = myFaceListArea.index(max(myFaceListArea))
        return img, [myFaceListC[i], myFaceListArea[i]]
    else:
        return img, [[0, 0], 0]


def trackFace(info, w, pid, pError):
    area = info[1]
    x, y = info[0]
    fb = 0
    error = x - w // 2
    speed = pid[0] * error + pid[1] * (error - pError)
    speed = int(np.clip(speed, -100, 100))
    if area > fbRange[0] and area < fbRange[1]:
        fb = 0
    elif area > fbRange[1]:
        fb = -20
    elif area < fbRange[0] and area != 0:
        fb = 20
    if x == 0:
        speed = 0
        error = 0
    # print (speed, fb)
    drone.send_rc_control(0, fb, 0, speed)
    return error

# cap = cv2.VideoCapture(0)
while True:
    # _, img = cap.read()
    img = drone.get_frame_read().frame
    img = cv2.resize(img, (w, h))
    img, info = findFace(img)
    pError = trackFace(info, w, pid, pError)
    # print('Centre', info[0], 'Area', info[1])
    cv2.imshow('Output', img)
    # if cv2.waitKey(1) & 0xFF == ord('l'):
    #     drone.land()
    #     break