Determine The Face Tilt Using OpenCV Python (original) (raw)

`import cv2 as cv import numpy as np

0 for webcam feed ; add "path to file"

for detection in video file

capture = cv.VideoCapture(0) face_cascade = cv.CascadeClassifier('haarcascade_frontalface_default.xml') eye_cascade = cv.CascadeClassifier("haarcascade_eye.xml")

while True: ret, frame = capture.read() gray = cv.cvtColor(frame, cv.COLOR_BGR2GRAY) faces = face_cascade.detectMultiScale(gray, 1.1, 5) x, y, w, h = 0, 0, 0, 0 for (x, y, w, h) in faces: cv.rectangle(frame, (x, y), (x + w, y + h), (0, 255, 0), 2) cv.circle(frame, (x + int(w * 0.5), y + int(h * 0.5)), 4, (0, 255, 0), -1) eyes = eye_cascade.detectMultiScale(gray[y:(y + h), x:(x + w)], 1.1, 4) index = 0 eye_1 = [None, None, None, None] eye_2 = [None, None, None, None] for (ex, ey, ew, eh) in eyes: if index == 0: eye_1 = [ex, ey, ew, eh] elif index == 1: eye_2 = [ex, ey, ew, eh] cv.rectangle(frame[y:(y + h), x:(x + w)], (ex, ey), (ex + ew, ey + eh), (0, 0, 255), 2) index = index + 1 if (eye_1[0] is not None) and (eye_2[0] is not None): if eye_1[0] < eye_2[0]: left_eye = eye_1 right_eye = eye_2 else: left_eye = eye_2 right_eye = eye_1 left_eye_center = ( int(left_eye[0] + (left_eye[2] / 2)), int(left_eye[1] + (left_eye[3] / 2)))

    right_eye_center = (
        int(right_eye[0] + (right_eye[2] / 2)),
      int(right_eye[1] + (right_eye[3] / 2)))
    
    left_eye_x = left_eye_center[0]
    left_eye_y = left_eye_center[1]
    right_eye_x = right_eye_center[0]
    right_eye_y = right_eye_center[1]

    delta_x = right_eye_x - left_eye_x
    delta_y = right_eye_y - left_eye_y
    
    # Slope of line formula
    angle = np.arctan(delta_y / delta_x)  
    
    # Converting radians to degrees
    angle = (angle * 180) / np.pi  

    # Provided a margin of error of 10 degrees
    # (i.e, if the face tilts more than 10 degrees
    # on either side the program will classify as right or left tilt)
    if angle > 10:
        cv.putText(frame, 'RIGHT TILT :' + str(int(angle))+' degrees',
                   (20, 30), cv.FONT_HERSHEY_SIMPLEX, 1,
                   (0, 0, 0), 2, cv.LINE_4)
    elif angle < -10:
        cv.putText(frame, 'LEFT TILT :' + str(int(angle))+' degrees',
                   (20, 30), cv.FONT_HERSHEY_SIMPLEX, 1, 
                   (0, 0, 0), 2, cv.LINE_4)
    else:
        cv.putText(frame, 'STRAIGHT :', (20, 30),
                   cv.FONT_HERSHEY_SIMPLEX, 1, 
                   (0, 0, 0), 2, cv.LINE_4)

cv.imshow('Frame', frame)

if cv.waitKey(1) & 0xFF == 27:
    break

capture.release() cv.destroyAllWindows()

`