本篇文章小编给大家分享一下利用opencv实现人脸识别功能代码示例,文章代码介绍的很详细,小编觉得挺不错的,现在分享给大家供大家参考,有需要的小伙伴们可以来看看。
一、环境
pip install opencv-python
python3.9
pycharm2020
人狠话不多,直接上代码,注释在代码里面,不说废话。
二、使用Haar级联进行人脸检测
测试案例:
代码:(记得自己到下载地址下载对应的xml)
# coding=gbk """ 作者:川川 @时间 : 2021/9/5 16:38 https://github.com/opencv/opencv/tree/master/data/haarcascades """ import cv2 # 待检测的图片路径 imagepath="2.jpg" image = cv2.imread(imagepath)#读取图片 gray = cv2.cvtColor(image,cv2.COLOR_BGR2GRAY)#图像转换为灰度图: face_cascade = cv2.CascadeClassifier(r'./haarcascade_frontalface_default.xml')#加载使用人脸识别器 faces = face_cascade.detectMultiScale(gray)#检测图像中的所有面孔 #为每个人脸绘制一个蓝色矩形 for x, y, width, height in faces: # 这里的color是 蓝 黄 红,与rgb相反,thickness设置宽度 cv2.rectangle(image, (x, y), (x + width, y + height), color=(255, 0, 0), thickness=2) # 最后,让我们保存新图像 cv2.imwrite("beauty_detected.jpg", image)
效果:
效果可以看出这个效果并不是很好。
三、Haar级联结合摄像头
代码:(还是用的前面得xml)
# coding=gbk """ 摄像头人脸识别 作者:川川 @时间 : 2021/9/5 17:15 Haar级联结合摄像头 """ import cv2 #创建新的cam对象 cap = cv2.VideoCapture(0,cv2.CAP_DSHOW) #初始化人脸识别器(默认的人脸haar级联) face_cascade = cv2.CascadeClassifier(r'./haarcascade_frontalface_default.xml') while True: # 从摄像头读取图像 _, image = cap.read() # 转换为灰度 image_gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY) # 检测图像中的所有人脸 faces = face_cascade.detectMultiScale(image_gray, 1.3, 5) # 为每个人脸绘制一个蓝色矩形 for x, y, width, height in faces: cv2.rectangle(image, (x, y), (x + width, y + height), color=(255, 0, 0), thickness=2) cv2.imshow("image", image) if cv2.waitKey(1) == ord("q"): break cap.release() cv2.destroyAllWindows()
效果:
四、使用SSD的人脸检测
代码:
# coding=gbk """ 图片人脸识别 作者:川川 @时间 : 2021/9/5 17:22 """ import cv2 import numpy as np # 下载链接:https://raw.githubusercontent.com/opencv/opencv/master/samples/dnn/face_detector/deploy.prototxt prototxt_path = r"./deploy.prototxt.txt" # 下载链接:https://raw.githubusercontent.com/opencv/opencv_3rdparty/dnn_samples_face_detector_20180205_fp16/res10_300x300_ssd_iter_140000_fp16.caffemodel model_path =r"./res10_300x300_ssd_iter_140000_fp16.caffemodel" model = cv2.dnn.readNetFromCaffe(prototxt_path, model_path) image = cv2.imread("2.jpg") h, w = image.shape[:2] blob = cv2.dnn.blobFromImage(image, 1.0, (300, 300),(104.0, 177.0, 123.0)) model.setInput(blob) output = np.squeeze(model.forward()) font_scale = 1.0 for i in range(0, output.shape[0]): confidence = output[i, 2] if confidence > 0.5: box = output[i, 3:7] * np.array([w, h, w, h]) start_x, start_y, end_x, end_y = box.astype(np.int) cv2.rectangle(image, (start_x, start_y), (end_x, end_y), color=(255, 0, 0), thickness=2) cv2.putText(image, f"{confidence*100:.2f}%", (start_x, start_y-5), cv2.FONT_HERSHEY_SIMPLEX, font_scale, (255, 0, 0), 2) cv2.imshow("image", image) cv2.waitKey(0) cv2.imwrite("beauty_detected.jpg", image)
效果:
我们可以看到现在的识别效果非常好了。
五、 SSD结合摄像头人脸检测
代码:
# coding=gbk """ 作者:川川 @时间 : 2021/9/5 17:26 SSD结合摄像头的人脸检测 """ import cv2 import numpy as np prototxt_path = "deploy.prototxt.txt" model_path = "res10_300x300_ssd_iter_140000_fp16.caffemodel" model = cv2.dnn.readNetFromCaffe(prototxt_path, model_path) cap = cv2.VideoCapture(0) while True: _, image = cap.read() h, w = image.shape[:2] blob = cv2.dnn.blobFromImage(image, 1.0, (300, 300), (104.0, 177.0, 123.0)) model.setInput(blob) output = np.squeeze(model.forward()) font_scale = 1.0 for i in range(0, output.shape[0]): confidence = output[i, 2] if confidence > 0.5: box = output[i, 3:7] * np.array([w, h, w, h]) start_x, start_y, end_x, end_y = box.astype(np.int) cv2.rectangle(image, (start_x, start_y), (end_x, end_y), color=(255, 0, 0), thickness=2) cv2.putText(image, f"{confidence*100:.2f}%", (start_x, start_y-5), cv2.FONT_HERSHEY_SIMPLEX, font_scale, (255, 0, 0), 2) cv2.imshow("image", image) if cv2.waitKey(1) == ord("q"): break cv2.destroyAllWindows() cap.release()
效果:
可以发现SSD效果特别好!