TypeError: unsupported operand type(s) for -: 'tuple' and 'int'

[spriya]

Traceback (most recent call last):
File "main.py", line 55, in <module>
res=names[recognizer.predict(gray[y:y+h, x:x+w])-1]
TypeError: unsupported operand type(s) for -: 'tuple' and 'int'


This is my error . and the code is

import cv2
import numpy as np
import os
import serial
ser = serial.Serial('/dev/ttyACM0', 9600, timeout=1)
cascadePath = "haarcascade_frontalface_default.xml"
faceCascade = cv2.CascadeClassifier(cascadePath)
recognizer=cv2.face.createLBPHFaceRecognizer()
#Loading each image and cropping the face preparing the dataset
# for filename in os.listdir('Dataset'):
# im=cv2.imread('Dataset/'+filename,0)
# print filename
# faces = faceCascade.detectMultiScale(im, 1.3, 5)
# for (x,y,w,h) in faces:
# cv2.imwrite('Dataset/'+filename,im[y:y+h, x:x+w])

images=[]
labels=[]
for filename in os.listdir('Dataset'):
im=cv2.imread('Dataset/'+filename,0)
images.append(im)
labels.append(int(filename.split('.')[0][0]))
#print filename
names_file=open('labels.txt')
names=names_file.read().split('\n')
recognizer.train(images,np.array(labels))
print 'Training Done . . . '
font = cv2.FONT_HERSHEY_SIMPLEX
cap=cv2.VideoCapture(1)
lastRes=''
count=0
while(1):
_,frame=cap.read()
gray=cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
faces = faceCascade.detectMultiScale(gray, 1.3, 5)
count+=1
for (x,y,w,h) in faces:
cv2.rectangle(frame,(x,y),(x+w,y+h),(255,0,0),2)
if count>20:
res=names[recognizer.predict(gray[y:y+h, x:x+w])-1]
if res!=lastRes :
lastRes=res
print lastRes
ser.write(lastRes)
count=0
break


cv2.imshow('frame',frame)
k = 0xFF & cv2.waitKey(10)
if k == 27:
break
cap.release()
ser.close()
cv2.destroyAllWindows()

[dwblas]

The error message should be self explanatory. You are trying to do arithmetic on a tuple and an integer (you can only do arithmetic on types that are the same as a string + is different from an integer +). You will have to go through these calcs one at a time to see where the error is

gray[y:y+h, x:x+w])-1]