我正在尝试在 python 中进行基本的颜色转换，但是我似乎无法克服以下错误

Question

while True:
    ret, frame = cap.read()
    image, face = face_detector(frame)

def face_detector(img):
    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

Answer 1

I think your problem is that you're stuck in an infinite loop. while True will go on forever until you break out of it, or an exception is raised from something in the loop body. Why? Because True always evaluates to True . Go figure.

Possible solutions:

• Explicitly break out of the loop. Somewhere, at some point inside the body of a while True loop, you need to have a break command.
• Use while...: where ... is some expression, eg while foo < bar: . That way, the loop will terminate when the expression evaluates False .
• Use a for loop instead: for foo in foos: where foos is an iterable and foo is the variable name assigned to each item in that iterable in turn. This way the loop naturally terminates when you run out of foos.

Which solution is best depends on what you're trying to do and what your data or state looks like. Without more information, I can't tell you which to use.