元组索引超出范围/ int对象不可迭代

Question

the following problem occours: I'm trying to detect faces and call a function with the specific index values

 faces = face_cascade.detectMultiScale(gray, 1.3, 5)
            facesCopy = faces
            print("faces at 0")
            print(faces)
            if(len(faces) >= 1):
            for (i) in range(len(faces)):
                  #call function with values of faces at specific index(i)
                  detectFace(self, faces[i])

faces returns this: [[247 101 237 237]] facesCopy the same, but faces[i] returns [247 101 237 237]

how do I get the inner array? faces[0] returns truple out of range or any variation of faces[0][0] or [0][0][0][0] returns in a for loop int object is not iterable:

for (x,y,w,h) in faces[0]:#do stuff

What am I missing or to blind to see? I'm guessing it has something to do with the packed array? The values are x and y postion and width and height of the face. Thank you for any help or suggestions

Answer 1

detectMultiScale returns a list of rectangles.

[[247 101 237 237]] would be a single one, as in an array with one rectangle/array.

for face in faces:
    print(face)

Outputs:

[247, 101, 237, 237]

If you want to unpack the array into variables:

x, y, w, h = face

I'm not sure what arguments detectFace requires thought.

If you only want the first rectangle, just access it by index:

faces[0]