python - TypeError:crop()从一到两个位置参数，但是给出了三个

Question

我一直在与numpy，PIL和OpenCV一起创建人脸检测和处理系统。我想做的是在边界框周围裁剪(以便进行我尚未编写的进一步处理)，所以我写了以下内容:

import cv2
import numpy as np
from PIL import Image 
def main():
    #Creates a camera object
    vidCapture = cv2.VideoCapture(0)
    while 1:
        faceDetector = FaceDetector()
        #stores the current frame into the frame variable
        ret, frame = vidCapture.read()
        #detects any faces and draws bounding boxes around them
        img = faceDetector.find_any_faces(frame)
        processing = Processing()
        #crops everything around the bounding boxes for the faces
        processing.mask(frame, faceDetector.getPoint1(), faceDetector.getPoint2())

class Processing():

    #masks around the bounding boxes for the face
    def mask(self, image, p1, p2):
        #creates a numpy array from the image
        arrimg = np.array(image)
        #creates a PIL Image from the np array
        img = Image.fromarray(arrimg)

        #crops around each bounding box
        cropped_image = img.crop(p1, p2)
        return cropped_image

这将引发一条TypeError错误消息:“crop()从1到2个位置参数，但给出了3个”。从我的发现中，这些通常是因为不包括 self作为方法的参数，而是将我的代码包括在内。如果有人可以帮助，那就太好了!

Answer 1

img.crop() 将一个元组作为参数(第二个是已添加的self)。当您传递2时，它将以三个参数结尾，这会给您一个错误:

Image.crop(box=None)

Returns a rectangular region from this image. The box is a 4-tuple defining the left, upper, right, and lower pixel coordinate.

Parameters: box – The crop rectangle, as a (left, upper, right, lower)-tuple.

您可以将元组加在一起以组成一个4元素元组:

img.crop(p1 + p2)

或传播它们:

img.crop((*p1, *p2))