python+openCV调用摄像头拍摄和处理图片的实现

import cv2
import os

print("=============================================")
print("= 热键(请在摄像头的窗口使用)：       =")
print("= z: 更改存储目录             =")
print("= x: 拍摄图片               =")
print("= q: 退出                 =")
print("=============================================")
print()
class_name = input("请输入存储目录：")
while os.path.exists(class_name):
  class_name = input("目录已存在！请输入存储目录：")
os.mkdir(class_name)

index = 1
cap = cv2.VideoCapture(0)
width = 640
height = 480
w = 360
cap.set(cv2.CAP_PROP_FRAME_WIDTH, width)
cap.set(cv2.CAP_PROP_FRAME_HEIGHT, height)

crop_w_start = (width-w)//2
crop_h_start = (height-w)//2

print(width, height)

while True:
  # get a frame
  ret, frame = cap.read()
  # show a frame
  frame = frame[crop_h_start:crop_h_start+w, crop_w_start:crop_w_start+w]
  frame = cv2.flip(frame,1,dst=None)
  cv2.imshow("capture", frame)

  input = cv2.waitKey(1) & 0xFF

  if input == ord('z'):
    class_name = input("请输入存储目录：")
    while os.path.exists(class_name):
      class_name = input("目录已存在！请输入存储目录：")
    os.mkdir(class_name)
  elif input == ord('x'):
    cv2.imwrite("%s/%d.jpeg" % (class_name, index),
          cv2.resize(frame, (224, 224), interpolation=cv2.INTER_AREA))
    print("%s: %d 张图片" % (class_name, index))
    index += 1
  if input == ord('q'):
    break

    
cap.release()
cv2.destroyAllWindows()

# 获取
width = int(videoCapture.get(cv2.CV_CAP_PROP_FRAME_WIDTH)
height = int(videoCapture.get(cv2.CV_CAP_PROP_FRAME_HEIGHT)
# 设置
cv2.VideoCapture(0).set(cv2.CAP_PROP_FRAME_WIDTH, width)
cv2.VideoCapture(0).set(cv2.CAP_PROP_FRAME_HEIGHT, height)