ICode9

精准搜索请尝试: 精确搜索
首页 > 其他分享> 文章详细

人脸识别数据集的建立(dlib+opencv)及人脸识别

2021-11-19 13:30:00  阅读:250  来源: 互联网

标签:人脸识别 features img cv2 face opencv 人脸 faces dlib


文章内容:
一、人脸识别数据集的建立。利用dlib和opencv编程: 1)采集自己的脸部图片20张,保存到以学号命名的文件目录下;2)采集对应20张图片的68个特征点数组,以 face_features.txt (i为01到20的数字)文件保存到同一目录下;3)通过20个特征,计算出平均(mean)特征数组 face_feature_mean.txt.
二、利用dlib和opencv编程,打开摄像头,对捕获到的人脸进行特征提取,与平均特征进行误差计算(欧几里得距离),当误差小于一定阈值时,判断为同一个人,否则判断为 unknown。

嘿!我是目录

一、采集脸部图片二十张

1.1 库文件准备

1.2 录入人脸数据

1.2.1 代码

  • 打开Acaconda3 的 Jupyter Notebook
  • 输入代码:
  • 一定要注意文件路径,改为自己的路径。

import cv2
import dlib
import os
import sys
import random
# 存储位置
output_dir = 'D:/myworkspace/JupyterNotebook/People/person/person1/631907060228/1'
size = 64
 
if not os.path.exists(output_dir):
    os.makedirs(output_dir)
# 改变图片的亮度与对比度
 
def relight(img, light=1, bias=0):
    w = img.shape[1]
    h = img.shape[0]
    #image = []
    for i in range(0,w):
        for j in range(0,h):
            for c in range(3):
                tmp = int(img[j,i,c]*light + bias)
                if tmp > 255:
                    tmp = 255
                elif tmp < 0:
                    tmp = 0
                img[j,i,c] = tmp
    return img
 
#使用dlib自带的frontal_face_detector作为我们的特征提取器
detector = dlib.get_frontal_face_detector()
# 打开摄像头 参数为输入流,可以为摄像头或视频文件
camera = cv2.VideoCapture(0)
#camera = cv2.VideoCapture('C:/Users/CUNGU/Videos/Captures/wang.mp4')

index = 1
while True:
    if (index <= 20):#存储20张人脸特征图像
        print('Being processed picture %s' % index)
        # 从摄像头读取照片
        success, img = camera.read()
        # 转为灰度图片
        gray_img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
        # 使用detector进行人脸检测
        dets = detector(gray_img, 1)
 
        for i, d in enumerate(dets):
            x1 = d.top() if d.top() > 0 else 0
            y1 = d.bottom() if d.bottom() > 0 else 0
            x2 = d.left() if d.left() > 0 else 0
            y2 = d.right() if d.right() > 0 else 0
 
            face = img[x1:y1,x2:y2]
            # 调整图片的对比度与亮度, 对比度与亮度值都取随机数,这样能增加样本的多样性
            face = relight(face, random.uniform(0.5, 1.5), random.randint(-50, 50))
 
            face = cv2.resize(face, (size,size))
 
            cv2.imshow('image', face)
 
            cv2.imwrite(output_dir+'/'+str(index)+'.jpg', face)
 
            index += 1
        key = cv2.waitKey(30) & 0xff
        if key == 27:
            break
    else:
        print('Finished!')
        # 释放摄像头 release camera
        camera.release()
        # 删除建立的窗口 delete all the windows
        cv2.destroyAllWindows()
        break

1.2.2 运行结果

在这里插入图片描述

  • 在对应的文件下找到,即可看到截取的20张人脸:

在这里插入图片描述

二、构建数据集

采集对应20张图片的68个特征点数组,以 face_features.txt (i为01到20的数字)文件保存到同一目录下。通过20个特征,计算出平均(mean)特征数组 face_feature_mean.csv。

2.1 dlib人脸特征检测原理

  1. 提取特征点:
    例:
    在这里插入图片描述

  2. 将特征值保存到CSV文件

  3. 计算特征数据集的欧氏距离作对比,当误差小于一定阙值就判定为同一人。

2.2 采集特征点数组,计算平均特征数组

2.2.1 代码

# 从人脸图像文件中提取人脸特征存入 CSV
# Features extraction from images and save into features_all.csv

# return_128d_features()          获取某张图像的128D特征
# compute_the_mean()              计算128D特征均值

from cv2 import cv2 as cv2
import os
import dlib
from skimage import io
import csv
import numpy as np

# 要读取人脸图像文件的路径
path_images_from_camera = "D:/myworkspace/JupyterNotebook/People/person/person1/631907060228/"

# Dlib 正向人脸检测器
detector = dlib.get_frontal_face_detector()

# Dlib 人脸预测器
predictor = dlib.shape_predictor("D:/ProgramData/wenjian/shape_predictor_68_face_landmarks.dat")

# Dlib 人脸识别模型
# Face recognition model, the object maps human faces into 128D vectors
face_rec = dlib.face_recognition_model_v1("D:/ProgramData/wenjian/dlib_face_recognition_resnet_model_v1.dat")


# 返回单张图像的 128D 特征
def return_128d_features(path_img):
    img_rd = io.imread(path_img)
    img_gray = cv2.cvtColor(img_rd, cv2.COLOR_BGR2RGB)
    faces = detector(img_gray, 1)

    print("%-40s %-20s" % ("检测到人脸的图像 / image with faces detected:", path_img), '\n')

    # 因为有可能截下来的人脸再去检测,检测不出来人脸了
    # 所以要确保是 检测到人脸的人脸图像 拿去算特征
    if len(faces) != 0:
        shape = predictor(img_gray, faces[0])
        face_descriptor = face_rec.compute_face_descriptor(img_gray, shape)
    else:
        face_descriptor = 0
        print("no face")

    return face_descriptor


# 将文件夹中照片特征提取出来, 写入 CSV
def return_features_mean_personX(path_faces_personX):
    features_list_personX = []
    photos_list = os.listdir(path_faces_personX)
    if photos_list:
        for i in range(len(photos_list)):
            # 调用return_128d_features()得到128d特征
            print("%-40s %-20s" % ("正在读的人脸图像 / image to read:", path_faces_personX + "/" + photos_list[i]))
            features_128d = return_128d_features(path_faces_personX + "/" + photos_list[i])
            #  print(features_128d)
            # 遇到没有检测出人脸的图片跳过
            if features_128d == 0:
                i += 1
            else:
                features_list_personX.append(features_128d)
                i1=str(i+1)
                add="D:/myworkspace/JupyterNotebook/People/person/person1/631907060228/csv/"+"face_features"+i1+".csv"
                print(add)
                with open(add, "w", newline="") as csvfile:
                    writer1 = csv.writer(csvfile)
                    writer1.writerow(features_128d)
    else:
        print("文件夹内图像文件为空 / Warning: No images in " + path_faces_personX + '/', '\n')

    # 计算 128D 特征的均值
    # N x 128D -> 1 x 128D
    if features_list_personX:
        features_mean_personX = np.array(features_list_personX).mean(axis=0)
    else:
        features_mean_personX = '0'

    return features_mean_personX


# 读取某人所有的人脸图像的数据
people = os.listdir(path_images_from_camera)
people.sort()

with open("D:/myworkspace/JupyterNotebook/People/person/person1/631907060228/face_feature_mean.csv", "w", newline="") as csvfile:
    writer = csv.writer(csvfile)
    for person in people:
        print("##### " + person + " #####")
        # Get the mean/average features of face/personX, it will be a list with a length of 128D
        features_mean_personX = return_features_mean_personX(path_images_from_camera + person)
        writer.writerow(features_mean_personX)
        print("特征均值 / The mean of features:", list(features_mean_personX))
        print('\n')
    print("所有录入人脸数据存入 / Save all the features of faces registered into: D:/myworkspace/JupyterNotebook/People/person/person1/631907060228/face_feature_mean.csv")

2.2.2 运行结果

在这里插入图片描述

  • 在对应的文件下找到,即可看到采集特征点数组与平均特征数组的.csv文件

在这里插入图片描述
在这里插入图片描述

三、人脸识别

利用dlib和opencv编程,打开摄像头,对捕获到的人脸进行特征提取,与平均特征进行误差计算(欧几里得距离),当误差小于一定阈值时,判断为同一个人,否则判断为 unknown。

3.1 代码:

# 摄像头实时人脸识别
import os
import winsound # 系统音效
from playsound import playsound # 音频播放
import dlib          # 人脸处理的库 Dlib
import csv # 存入表格
import time
import sys
import numpy as np   # 数据处理的库 numpy
from cv2 import cv2 as cv2           # 图像处理的库 OpenCv
import pandas as pd  # 数据处理的库 Pandas


# 人脸识别模型,提取128D的特征矢量
# face recognition model, the object maps human faces into 128D vectors
# Refer this tutorial: http://dlib.net/python/index.html#dlib.face_recognition_model_v1
facerec = dlib.face_recognition_model_v1("D:/ProgramData/wenjian/dlib_face_recognition_resnet_model_v1.dat")


# 计算两个128D向量间的欧式距离
# compute the e-distance between two 128D features
def return_euclidean_distance(feature_1, feature_2):
    feature_1 = np.array(feature_1)
    feature_2 = np.array(feature_2)
    dist = np.sqrt(np.sum(np.square(feature_1 - feature_2)))
    return dist


# 处理存放所有人脸特征的 csv
path_features_known_csv = "D:/myworkspace/JupyterNotebook/People/person/person1/631907060228/face_feature_mean.csv"
csv_rd = pd.read_csv(path_features_known_csv, header=None)


# 用来存放所有录入人脸特征的数组
# the array to save the features of faces in the database
features_known_arr = []

# 读取已知人脸数据
# print known faces
for i in range(csv_rd.shape[0]):
    features_someone_arr = []
    for j in range(0, len(csv_rd.iloc[i, :])):
        features_someone_arr.append(csv_rd.iloc[i, :][j])
    features_known_arr.append(features_someone_arr)
print("Faces in Database:", len(features_known_arr))

# Dlib 检测器和预测器
# The detector and predictor will be used
detector = dlib.get_frontal_face_detector()
predictor = dlib.shape_predictor('D:/ProgramData/wenjian/shape_predictor_68_face_landmarks.dat')

# 创建 cv2 摄像头对象
# cv2.VideoCapture(0) to use the default camera of PC,
# and you can use local video name by use cv2.VideoCapture(filename)
cap = cv2.VideoCapture(0)

# cap.set(propId, value)
# 设置视频参数,propId 设置的视频参数,value 设置的参数值
cap.set(3, 480)

# cap.isOpened() 返回 true/false 检查初始化是否成功
# when the camera is open
while cap.isOpened():

    flag, img_rd = cap.read()
    kk = cv2.waitKey(1)

    # 取灰度
    img_gray = cv2.cvtColor(img_rd, cv2.COLOR_RGB2GRAY)

    # 人脸数 faces
    faces = detector(img_gray, 0)

    # 待会要写的字体 font to write later
    font = cv2.FONT_HERSHEY_COMPLEX

    # 存储当前摄像头中捕获到的所有人脸的坐标/名字
    # the list to save the positions and names of current faces captured
    pos_namelist = []
    name_namelist = []

    # 按下 q 键退出
    # press 'q' to exit
    if kk == ord('q'):
        break
    else:
        # 检测到人脸 when face detected
        if len(faces) != 0:  
            # 获取当前捕获到的图像的所有人脸的特征,存储到 features_cap_arr
            # get the features captured and save into features_cap_arr
            features_cap_arr = []
            for i in range(len(faces)):
                shape = predictor(img_rd, faces[i])
                features_cap_arr.append(facerec.compute_face_descriptor(img_rd, shape))

            # 遍历捕获到的图像中所有的人脸
            # traversal all the faces in the database
            for k in range(len(faces)):
                print("##### camera person", k+1, "#####")
                # 让人名跟随在矩形框的下方
                # 确定人名的位置坐标
                # 先默认所有人不认识,是 unknown
                # set the default names of faces with "unknown"
                name_namelist.append("unknown")

                # 每个捕获人脸的名字坐标 the positions of faces captured
                pos_namelist.append(tuple([faces[k].left(), int(faces[k].bottom() + (faces[k].bottom() - faces[k].top())/4)]))

                # 对于某张人脸,遍历所有存储的人脸特征
                # for every faces detected, compare the faces in the database
                e_distance_list = []
                for i in range(len(features_known_arr)):
                    # 如果 person_X 数据不为空
                    if str(features_known_arr[i][0]) != '0.0':
                        print("with person", str(i + 1), "the e distance: ", end='')
                        e_distance_tmp = return_euclidean_distance(features_cap_arr[k], features_known_arr[i])
                        print(e_distance_tmp)
                        e_distance_list.append(e_distance_tmp)
                    else:
                        # 空数据 person_X
                        e_distance_list.append(999999999)
                # 找出最接近的一个人脸数据是第几个
                # Find the one with minimum e distance
                similar_person_num = e_distance_list.index(min(e_distance_list))
                print("Minimum e distance with person", int(similar_person_num)+1)
                
                # 计算人脸识别特征与数据集特征的欧氏距离
                # 距离小于0.4则标出为可识别人物
                if min(e_distance_list) < 0.4:
                    # 这里可以修改摄像头中标出的人名
                    # Here you can modify the names shown on the camera
                    # 1、遍历文件夹目录
                    folder_name = 'D:/myworkspace/JupyterNotebook/People/person/person1/631907060228/'
                    # 最接近的人脸
                    sum=similar_person_num+1
                    key_id=1 # 从第一个人脸数据文件夹进行对比
                    # 获取文件夹中的文件名:1wang、2zhou、3...
                    file_names = os.listdir(folder_name)
                    for name in file_names:
                        # print(name+'->'+str(key_id))
                        if sum ==key_id:
                            #winsound.Beep(300,500)# 响铃:300频率,500持续时间
                            name_namelist[k] = name[0:]#人名删去第一个数字(用于视频输出标识)
                        key_id += 1
                    # 播放欢迎光临音效
                    #playsound('D:/myworkspace/JupyterNotebook/People/music/welcome.wav')
                    # print("May be person "+str(int(similar_person_num)+1))
                    # -----------筛选出人脸并保存到visitor文件夹------------
                    for i, d in enumerate(faces):
                        x1 = d.top() if d.top() > 0 else 0
                        y1 = d.bottom() if d.bottom() > 0 else 0
                        x2 = d.left() if d.left() > 0 else 0
                        y2 = d.right() if d.right() > 0 else 0
                        face = img_rd[x1:y1,x2:y2]
                        size = 64
                        face = cv2.resize(face, (size,size))
                        # 要存储visitor人脸图像文件的路径
                        path_visitors_save_dir = "D:/myworkspace/JupyterNotebook/People/person/person1/visitor/known"
                        # 存储格式:2019-06-24-14-33-40wang.jpg
                        now_time = time.strftime("%Y-%m-%d-%H-%M-%S", time.localtime())
                        save_name = str(now_time)+str(name_namelist[k])+'.jpg'
                        # print(save_name)
                        # 本次图片保存的完整url
                        save_path = path_visitors_save_dir+'/'+ save_name    
                        # 遍历visitor文件夹所有文件名
                        visitor_names = os.listdir(path_visitors_save_dir)
                        visitor_name=''
                        for name in visitor_names:
                            # 名字切片到分钟数:2019-06-26-11-33-00wangyu.jpg
                            visitor_name=(name[0:16]+'-00'+name[19:])
                        # print(visitor_name)
                        visitor_save=(save_name[0:16]+'-00'+save_name[19:])
                        # print(visitor_save)
                        # 一分钟之内重复的人名不保存
                        if visitor_save!=visitor_name:
                            cv2.imwrite(save_path, face)
                            print('新存储:'+path_visitors_save_dir+'/'+str(now_time)+str(name_namelist[k])+'.jpg')
                        else:
                            print('重复,未保存!')
                            
                else:
                    # 播放无法识别音效
                    #playsound('D:/myworkspace/JupyterNotebook/People/music/sorry.wav')
                    print("Unknown person")
                    # -----保存图片-------
                    # -----------筛选出人脸并保存到visitor文件夹------------
                    for i, d in enumerate(faces):
                        x1 = d.top() if d.top() > 0 else 0
                        y1 = d.bottom() if d.bottom() > 0 else 0
                        x2 = d.left() if d.left() > 0 else 0
                        y2 = d.right() if d.right() > 0 else 0
                        face = img_rd[x1:y1,x2:y2]
                        size = 64
                        face = cv2.resize(face, (size,size))
                        # 要存储visitor-》unknown人脸图像文件的路径
                        path_visitors_save_dir = "D:/myworkspace/JupyterNotebook/People/person/person1/visitor/unknown"
                        # 存储格式:2019-06-24-14-33-40unknown.jpg
                        now_time = time.strftime("%Y-%m-%d-%H-%M-%S", time.localtime())
                        # print(save_name)
                        # 本次图片保存的完整url
                        save_path = path_visitors_save_dir+'/'+ str(now_time)+'unknown.jpg'
                        cv2.imwrite(save_path, face)
                        print('新存储:'+path_visitors_save_dir+'/'+str(now_time)+'unknown.jpg')
                
                # 矩形框
                # draw rectangle
                for kk, d in enumerate(faces):
                    # 绘制矩形框
                    cv2.rectangle(img_rd, tuple([d.left(), d.top()]), tuple([d.right(), d.bottom()]), (0, 255, 255), 2)
                print('\n')

            # 在人脸框下面写人脸名字
            # write names under rectangle
            for i in range(len(faces)):
                cv2.putText(img_rd, name_namelist[i], pos_namelist[i], font, 0.8, (0, 255, 255), 1, cv2.LINE_AA)

    print("Faces in camera now:", name_namelist, "\n")

    #cv2.putText(img_rd, "Press 'q': Quit", (20, 450), font, 0.8, (84, 255, 159), 1, cv2.LINE_AA)
    cv2.putText(img_rd, "Face Recognition", (20, 40), font, 1, (0, 0, 255), 1, cv2.LINE_AA)
    cv2.putText(img_rd, "Visitors: " + str(len(faces)), (20, 100), font, 1, (0, 0, 255), 1, cv2.LINE_AA)

    # 窗口显示 show with opencv
    cv2.imshow("camera", img_rd)

# 释放摄像头 release camera
cap.release()

# 删除建立的窗口 delete all the windows
cv2.destroyAllWindows()


3.2 运行结果

  • 识别出后显示1:

在这里插入图片描述

  • 未识别出显示unknown:

在这里插入图片描述

小小的总结

建议人脸录入、构建人脸数据集和人脸识别 三个部分分别用不同的 Jupyter Notebook 的新建的Python3来运行,会不容易出错一点,也更容易排错。

此次实验还挺有趣的,录入人脸,分析图片,获得数据,就可以人脸识别了,看似简单,其实不然。人脸识别,要先识别出人脸,再识别出是不是你。

在运行人脸检测识别代码时,可能不知道如何退出,方法:按 q/Q 退出。

参考文献

  1. 人脸识别数据集建立及应用
  2. Dlib模型人脸特征检测原理及demo
  3. 基于dlib库人脸特征提取【构建自己的人脸识别数据集】

标签:人脸识别,features,img,cv2,face,opencv,人脸,faces,dlib
来源: https://blog.csdn.net/YouthBlood9/article/details/121416498

本站声明: 1. iCode9 技术分享网(下文简称本站)提供的所有内容,仅供技术学习、探讨和分享;
2. 关于本站的所有留言、评论、转载及引用,纯属内容发起人的个人观点,与本站观点和立场无关;
3. 关于本站的所有言论和文字,纯属内容发起人的个人观点,与本站观点和立场无关;
4. 本站文章均是网友提供,不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属;如您发现该文章侵犯了您的权益,可联系我们第一时间进行删除;
5. 本站为非盈利性的个人网站,所有内容不会用来进行牟利,也不会利用任何形式的广告来间接获益,纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。

专注分享技术,共同学习,共同进步。侵权联系[81616952@qq.com]

Copyright (C)ICode9.com, All Rights Reserved.

ICode9版权所有