OpenCV人臉檢測 眼睛檢測之在人臉以外找眼睛

今天在學習opencv人臉檢測時，發現眼睛檢測是在人臉以外尋找眼睛的，源**如下：

import cv2

def detect():
face_cascade = cv2.cascadeclassifier('../cascades/haarcascade_frontalface_default.xml')
eye_cascade = cv2.cascadeclassifier('../cascades/haarcascade_eye.xml')
camera = cv2.videocapture(0)
while (true):
ret , frame = camera.read()
gray = cv2.cvtcolor(frame, cv2.color_bgr2gray)
faces = face_cascade.detectmultiscale(gray, 1.3, 5)
for (x,y,w,h) in faces:
img = cv2.rectangle(frame, (x,y), (x+w, y+h), (255,0,0), 2)
roi_gray = gray[y: y+h, x: x+w]
eyes = eye_cascade.detectmultiscale(roi_gray, 1.8, 5, 0, (40,40))
for (ex,ey,ew,eh) in eyes:
cv2.rectangle(img, (ex, ey), (ex+ew, ey+eh), (0, 255, 0), 2)
cv2.imshow("camera", frame)
if cv2.waitkey(int(1000 / 12)) & 0xff == ord("q"):
break
camera.release()
cv2.destroyallwindows()
detect()

後來一檢查**才發現問題，

cv2.rectangle(img, (ex, ey), (ex+ew, ey+eh), (0, 255, 0), 2)

roi_color = img[y:y + h, x:x + w]

import cv2

def detect():
face_cascade = cv2.cascadeclassifier('../cascades/haarcascade_frontalface_default.xml')
eye_cascade = cv2.cascadeclassifier('../cascades/haarcascade_eye.xml')
camera = cv2.videocapture(0)
while (true):
ret , frame = camera.read()
gray = cv2.cvtcolor(frame, cv2.color_bgr2gray)
faces = face_cascade.detectmultiscale(gray, 1.3, 5)
for (x,y,w,h) in faces:
img = cv2.rectangle(frame, (x,y), (x+w, y+h), (255,0,0), 2)
roi_gray = gray[y: y+h, x: x+w]
eyes = eye_cascade.detectmultiscale(roi_gray, 1.8, 5, 0, (40,40))
roi_color = img[y:y + h, x:x + w]
for (ex,ey,ew,eh) in eyes:
cv2.rectangle(roi_color, (ex, ey), (ex+ew, ey+eh), (0, 255, 0), 2)
cv2.imshow("camera", frame)
if cv2.waitkey(int(1000 / 12)) & 0xff == ord("q"):
break
camera.release()
cv2.destroyallwindows()
detect()

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