Detect more than one face OpenCV - python-2.7

Question

i'm learning python so i'm trying to work with OpenCV.
Program detecting only one face, if there will be 2 faces it will be show only one
here's the code:
def getData(id):
psg = psgconnect.cursor()
psg.execute("SELECT name FROM people WHERE id=%s", (Id,))
cursor = psg.execute("SELECT name FROM people WHERE id=%s", (Id,))
Data = None
psgconnect.commit()
row = psg.fetchone()
#psgconnect.close()
return row
while True:
ret, img = cam.read()
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
face = faceDetect.detectMultiScale(gray, 1.3, 5)
for(x, y, w, h) in face:
cv2.rectangle(img, (x, y), (x + w, y + h), (0, 255, 0), 2)
Id, conf = recognizer.predict(gray[y:y + h, x:x + w])
data = getData(Id)
# if data != None:
if(conf<50):
#cv2.putText(img, data[0], (x, y + h), cv2.FONT_HERSHEY_PLAIN, 4, (255, 255, 255), 4)
cv2.putText(img, 'nashel', (x, y + h), cv2.FONT_HERSHEY_PLAIN, 4, (255, 255, 255), 4)
elif(conf>51):
cv2.putText(img, 'Unknown', (x, y + h), cv2.FONT_HERSHEY_PLAIN, 4, (255, 255, 255), 4)
cv2.imshow("Face", img)
k = cv2.waitKey(10)
print("suda doshli")
if k == 27:
#psg.close()
psgconnect.close()
print("zdes")
break
cam.release()
input()
cv2.destroyAllWindows()
What wroung could be?

Answer 1

Since you're not getting any answer, I'll try and help you even though I don't use OpenCV.
First, are you sure that OpenCV is only detecting one face in a two-face image or could it be a problem with your loop ?
You could check how many faces are detected by using a simple print:
ret, img = cam.read()
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
face = faceDetect.detectMultiScale(gray, 1.3, 5)
print len(face)
If it prints 1, then there actually is a problem with how OpenCV is working with your image (and in this case I really can't help you because I don't know anything about OpenCV). However, when I read your code, I get the feeling that some things are off (even after your edit), so I propose you tried the following:
def getData(id):
psg = psgconnect.cursor()
psg.execute("SELECT name FROM people WHERE id=%s", (Id,))
cursor = psg.execute("SELECT name FROM people WHERE id=%s", (Id,))
Data = None
psgconnect.commit()
row = psg.fetchone()
#psgconnect.close()
return row
while True:
ret, img = cam.read()
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
face = faceDetect.detectMultiScale(gray, 1.3, 5)
for(x, y, w, h) in face:
cv2.rectangle(img, (x, y), (x + w, y + h), (0, 255, 0), 2)
Id, conf = recognizer.predict(gray[y:y + h, x:x + w])
data = getData(Id)
if(conf<50):
cv2.putText(img, 'nashel', (x, y + h), cv2.FONT_HERSHEY_PLAIN, 4, (255, 255, 255), 4)
elif(conf>51):
cv2.putText(img, 'Unknown', (x, y + h), cv2.FONT_HERSHEY_PLAIN, 4, (255, 255, 255), 4)
cv2.imshow("Face", img)
k = cv2.waitKey(10)
print("suda doshli")
if k == 27:
#psg.close()
psgconnect.close()
print("zdes")
break
cam.release()
input()
cv2.destroyAllWindows()
Let me know how it goes!
As a side note: since you're learning python and considering the code you pasted before your first edit, I would just like to emphasize how important indentation is in python. A change of indentation can completely change the meaning of your code, and it is very important that you understand how and why certain blocks are indented.