OpenCV人脸检测demo--facedetect

&1 问题来源

  在运行官网的facedetect这个demo的时候,总是不会出来result的图形,电脑右下角提示的错误是“显示器驱动程序已停止响应,而且已恢复 windows 8(R)”。

 

&2 前期处理

  • 修改代码,各种代码上的调试都尝试过,demo运行失败了;
  • 百度上的禁用视觉效果方案,即修改电脑的主题为“windows 经典”主题,demo运行失败了;
  • 百度上的重新安装显卡驱动方案,即重新装集成网卡驱动,导致显示器黑屏,倒腾了一天才整回来,失败;

 

&3 成功解决

  首先,打开注册表,找到HKEY_LOCAL_MACHINE,在SYSTEM中的CurrentControlSet中的Control的GrphicsDrivers上面点击右键,新建QEORD(64位)值(Q),数值名称为:TdrDelay,数值数据为:8,基数不用改变,选择十六进制即可。

  OpenCV人脸检测demo--facedetect_第1张图片

  然后,在你的项目编译文件夹内加入四个文件,haarcascade_eye_tree_eyeglasses.xml和haarcascade_frontalface_alt.xml、opencv_ffmpeg310_64.dll及opencv_world310d.dll;

  OpenCV人脸检测demo--facedetect_第2张图片

  在opencv的环境配置中,(前面有博文介绍),去掉可执行文件目录,去掉附加依赖项的opencv_world310.lib,至此,所有的环境配置方面已经完成。

 

&4 demo的代码和运行结果

 

注意:在opencv安装文件夹sources\samples\cpp中的文件facedetect.cpp即是源代码。

  1 #include "opencv2/objdetect.hpp"
  2 #include "opencv2/highgui.hpp"
  3 #include "opencv2/imgproc.hpp"
  4 #include 
  5 
  6 using namespace std;
  7 using namespace cv;
  8 
  9 static void help()
 10 
 11 {
 12   cout << "\nThis program demonstrates the cascade recognizer. Now you can use Haar or LBP features.\n"
 13   "This classifier can recognize many kinds of rigid objects, once the appropriate classifier is trained.\n"
 14   "It's most known use is for faces.\n"
 15   "Usage:\n"
 16   "./facedetect [--cascade= this is the primary trained classifier such as frontal face]\n"
 17   " [--nested-cascade[=nested_cascade_path this an optional secondary classifier such as eyes]]\n"
 18   " [--scale=]\n"
 19   " [--try-flip]\n"
 20   " [filename|camera_index]\n\n"
 21   "see facedetect.cmd for one call:\n"
 22   "./facedetect --cascade=\"../../data/haarcascades/haarcascade_frontalface_alt.xml\" --nested-cascade=\"../../data/haarcascades/haarcascade_eye_tree_eyeglasses.xml\" --scale=1.3\n\n"
 23   "During execution:\n\tHit any key to quit.\n"
 24   "\tUsing OpenCV version " << CV_VERSION << "\n" << endl;
 25 }
 26 
 27 void detectAndDraw(Mat& img, CascadeClassifier& cascade,
 28 CascadeClassifier& nestedCascade,
 29 double scale, bool tryflip);
 30 
 31 string cascadeName;
 32 string nestedCascadeName;
 33 
 34 int main(int argc, const char** argv)
 35 {
 36   VideoCapture capture;
 37   Mat frame, image;
 38   string inputName;
 39   bool tryflip;
 40   CascadeClassifier cascade, nestedCascade;
 41   double scale;
 42 
 43   cv::CommandLineParser parser(argc, argv,
 44     "{help h||}"
 45     "{cascade|haarcascade_frontalface_alt.xml|}"
 46     "{nested-cascade|haarcascade_eye_tree_eyeglasses.xml|}"
 47     "{scale|1|}{try-flip||}{@filename|lena.jpg|}"
 48   );
 49 
 50 
 51   if (parser.has("help"))
 52   {
 53     help();
 54     return 0;
 55   }
 56   cascadeName = parser.get<string>("cascade");
 57   nestedCascadeName = parser.get<string>("nested-cascade");
 58   scale = parser.get<double>("scale");
 59   if (scale < 1)
 60     scale = 1;
 61   tryflip = parser.has("try-flip");
 62   inputName = parser.get<string>("@filename");
 63   if (!parser.check())
 64   {
 65     parser.printErrors();
 66     return 0;
 67   }
 68   if (!nestedCascade.load(nestedCascadeName))
 69     cerr << "WARNING: Could not load classifier cascade for nested objects" << endl;
 70   if (!cascade.load(cascadeName))
 71   {
 72     cerr << "ERROR: Could not load classifier cascade" << endl;
 73     help();
 74     return -1;
 75   }
 76   if (inputName.empty() || (isdigit(inputName[0]) && inputName.size() == 1))
 77   {
 78     int c = inputName.empty() ? 0 : inputName[0] - '0';
 79     if (!capture.open(c))
 80     cout << "Capture from camera #" << c << " didn't work" << endl;
 81   }
 82   else if (inputName.size())
 83   {
 84     image = imread(inputName, 1);
 85     if (image.empty())
 86     {
 87       if (!capture.open(inputName))
 88       cout << "Could not read " << inputName << endl;
 89     }
 90   }
 91   else
 92   {
 93     image = imread("../data/lena.jpg", 1);
 94     if (image.empty()) cout << "Couldn't read ../data/lena.jpg" << endl;
 95   }
 96 
 97   if (capture.isOpened())
 98   {
 99     cout << "Video capturing has been started ..." << endl;
100 
101     for (;;)
102     {
103       capture >> frame;
104       if (frame.empty())
105       break;
106 
107       Mat frame1 = frame.clone();
108       detectAndDraw(frame1, cascade, nestedCascade, scale, tryflip);
109 
110       int c = waitKey(10);
111       if (c == 27 || c == 'q' || c == 'Q')
112       break;
113     }
114   }
115   else
116   {
117     cout << "Detecting face(s) in " << inputName << endl;
118     if (!image.empty())
119     {
120       detectAndDraw(image, cascade, nestedCascade, scale, tryflip);
121       waitKey(0);
122     }
123   else if (!inputName.empty())
124   {
125     /* assume it is a text file containing the
126     list of the image filenames to be processed - one per line */
127     FILE* f = fopen(inputName.c_str(), "rt");
128     if (f)
129     {
130       char buf[1000 + 1];
131       while (fgets(buf, 1000, f))
132       {
133         int len = (int)strlen(buf), c;
134         while (len > 0 && isspace(buf[len - 1]))
135         len--;
136         buf[len] = '\0';
137         cout << "file " << buf << endl;
138         image = imread(buf, 1);
139         if (!image.empty())
140         {
141           detectAndDraw(image, cascade, nestedCascade, scale, tryflip);
142           c = waitKey(0);
143           if (c == 27 || c == 'q' || c == 'Q')
144             break;
145         }
146         else
147         {
148           cerr << "Aw snap, couldn't read image " << buf << endl;
149         }
150       }
151     fclose(f);
152     }
153   }
154 }
155 
156 return 0;
157 }
158 
159 void detectAndDraw(Mat& img, CascadeClassifier& cascade,
160 CascadeClassifier& nestedCascade,
161 double scale, bool tryflip)
162 {
163 double t = 0;
164 vector faces, faces2;
165 const static Scalar colors[] =
166 {
167 Scalar(255, 0, 0),
168 Scalar(255, 128, 0),
169 Scalar(255, 255, 0),
170 Scalar(0, 255, 0),
171 Scalar(0, 128, 255),
172 Scalar(0, 255, 255),
173 Scalar(0, 0, 255),
174 Scalar(255, 0, 255)
175 };
176 Mat gray, smallImg;
177 
178 cvtColor(img, gray, COLOR_BGR2GRAY);
179 double fx = 1 / scale;
180 resize(gray, smallImg, Size(), fx, fx, INTER_LINEAR);
181 equalizeHist(smallImg, smallImg);
182 
183 t = (double)cvGetTickCount();
184 cascade.detectMultiScale(smallImg, faces,
185 1.1, 2, 0
186 //|CASCADE_FIND_BIGGEST_OBJECT
187 //|CASCADE_DO_ROUGH_SEARCH
188 | CASCADE_SCALE_IMAGE,
189 Size(30, 30));
190 if (tryflip)
191 {
192 flip(smallImg, smallImg, 1);
193 cascade.detectMultiScale(smallImg, faces2,
194 1.1, 2, 0
195 //|CASCADE_FIND_BIGGEST_OBJECT
196 //|CASCADE_DO_ROUGH_SEARCH
197 | CASCADE_SCALE_IMAGE,
198 Size(30, 30));
199 for (vector::const_iterator r = faces2.begin(); r != faces2.end(); r++)
200 {
201 faces.push_back(Rect(smallImg.cols - r->x - r->width, r->y, r->width, r->height));
202 }
203 }
204 t = (double)cvGetTickCount() - t;
205 printf("detection time = %g ms\n", t / ((double)cvGetTickFrequency()*1000.));
206 for (size_t i = 0; i < faces.size(); i++)
207 {
208 Rect r = faces[i];
209 Mat smallImgROI;
210 vector nestedObjects;
211 Point center;
212 Scalar color = colors[i % 8];
213 int radius;
214 
215 double aspect_ratio = (double)r.width / r.height;
216 if (0.75 < aspect_ratio && aspect_ratio < 1.3)
217 {
218 center.x = cvRound((r.x + r.width*0.5)*scale);
219 center.y = cvRound((r.y + r.height*0.5)*scale);
220 radius = cvRound((r.width + r.height)*0.25*scale);
221 circle(img, center, radius, color, 3, 8, 0);
222 }
223 else
224 rectangle(img, cvPoint(cvRound(r.x*scale), cvRound(r.y*scale)),
225 cvPoint(cvRound((r.x + r.width - 1)*scale), cvRound((r.y + r.height - 1)*scale)),
226 color, 3, 8, 0);
227 if (nestedCascade.empty())
228 continue;
229 smallImgROI = smallImg(r);
230 nestedCascade.detectMultiScale(smallImgROI, nestedObjects,
231 1.1, 2, 0
232 //|CASCADE_FIND_BIGGEST_OBJECT
233 //|CASCADE_DO_ROUGH_SEARCH
234 //|CASCADE_DO_CANNY_PRUNING
235 | CASCADE_SCALE_IMAGE,
236 Size(30, 30));
237 for (size_t j = 0; j < nestedObjects.size(); j++)
238 {
239 Rect nr = nestedObjects[j];
240 center.x = cvRound((r.x + nr.x + nr.width*0.5)*scale);
241 center.y = cvRound((r.y + nr.y + nr.height*0.5)*scale);
242 radius = cvRound((nr.width + nr.height)*0.25*scale);
243 circle(img, center, radius, color, 3, 8, 0);
244 }
245 }
246 imshow("result", img);
247 }
facedetect源码

 

结果:

OpenCV人脸检测demo--facedetect_第3张图片

 

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