import cv2filepath = "img/xingye-1.jpg"
img = cv2.imread(filepath)
# 转换灰色
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
# 显示图像
cv2.imshow("Image", gray)
cv2.waitKey(0)
cv2.destroyAllWindows()

import cv2filepath = "img/xingye-1.jpg"
img = cv2.imread(filepath)  # 读取图片
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)  # 转换灰色
x = y = 10  # 坐标
w = 100  # 矩形大小（宽、高）
color = (0, 0, 255)  # 定义绘制颜色
cv2.rectangle(img, (x, y), (x + w, y + w), color, 1)  # 绘制矩形
cv2.imshow("Image", img)  # 显示图像
cv2.waitKey(0)
cv2.destroyAllWindows()  # 释放所有的窗体资源

import cv2filepath = "img/xingye-1.jpg"
img = cv2.imread(filepath)  # 读取图片
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)  # 转换灰色# OpenCV人脸识别分类器
classifier = cv2.CascadeClassifier("C:\Python36\Lib\site-packages\opencv-master\data\haarcascades\haarcascade_frontalface_default.xml"
)
color = (0, 255, 0)  # 定义绘制颜色
# 调用识别人脸
faceRects = classifier.detectMultiScale(gray, scaleFactor=1.2, minNeighbors=3, minSize=(32, 32))
if len(faceRects):  # 大于0则检测到人脸for faceRect in faceRects:  # 单独框出每一张人脸x, y, w, h = faceRect# 框出人脸cv2.rectangle(img, (x, y), (x + h, y + w), color, 2)# 左眼cv2.circle(img, (x + w // 4, y + h // 4 + 30), min(w // 8, h // 8),color)#右眼cv2.circle(img, (x + 3 * w // 4, y + h // 4 + 30), min(w // 8, h // 8),color)#嘴巴cv2.rectangle(img, (x + 3 * w // 8, y + 3 * h // 4),(x + 5 * w // 8, y + 7 * h // 8), color)cv2.imshow("image", img)  # 显示图像
c = cv2.waitKey(10)cv2.waitKey(0)
cv2.destroyAllWindows()