編譯train_hog.cpp示例

Question

我想爲動物創建自定義HOG檢測器。所以我想從OpenCV 3.1編譯train_hog.cpp示例。但是我有關於目錄的問題。 這是load_images

void load_images(const string & prefix, const string & filename, vector<Mat> & img_lst); 


void load_images(const string & prefix, const string & filename, vector<Mat> & img_lst) 
{ 
    string line; 
    ifstream file; 

    file.open((prefix+filename).c_str()); 
    if(!file.is_open()) 
    { 
     cerr << "Unable to open the list of images from " << filename << " filename." << endl; 
     exit(-1); 
    } 

    bool end_of_parsing = false; 
    while(!end_of_parsing) 
    { 
     getline(file, line); 
     if(line.empty()) // no more file to read 
     { 
      end_of_parsing = true; 
      break; 
     } 
     Mat img = imread((prefix+line).c_str()); // load the image 
     if(img.empty()) // invalid image, just skip it. 
      continue; 
#ifdef _DEBUG 
     imshow("image", img); 
     waitKey(10); 
#endif 
     img_lst.push_back(img.clone()); 
    } 
} 



int main(int argc, char** argv) 
{ 
    cv::CommandLineParser parser(argc, argv, "{help h|| show help message}" 
      "{pd||pos_dir}{p||pos.lst}{nd||neg_dir}{n||neg.lst}"); 
    if (parser.has("help")) 
    { 
     parser.printMessage(); 
     exit(0); 
    } 
    vector<Mat> pos_lst; 
vector<Mat> full_neg_lst; 
vector<Mat> neg_lst; 
vector<Mat> gradient_lst; 
vector<int> labels; 
string pos_dir = parser.get<string>("C:/Train_HOG/Franksye_dataset/Train/pos/"); 
string pos = parser.get<string>("Train/pos"); 
string neg_dir = parser.get<string>("C:/Train_HOG/Franksye_dataset/Train/neg/"); 
string neg = parser.get<string>("Train/neg"); 
if(pos_dir.empty() || pos.empty() || neg_dir.empty() || neg.empty()) 

    { 
     cout << "Wrong number of parameters." << endl 
      << "Usage: " << argv[0] << " --pd=pos_dir -p=pos.lst --nd=neg_dir -n=neg.lst" << endl 
      << "example: " << argv[0] << " --pd=/INRIA_dataset/ -p=Train/pos.lst --nd=/INRIA_dataset/ -n=Train/neg.lst" << endl; 
     exit(-1); 
} 
load_images(pos_dir, pos, pos_lst); 
labels.assign(pos_lst.size(), +1); 
const unsigned int old = (unsigned int)labels.size(); 
load_images(neg_dir, neg, full_neg_lst); 
sample_neg(full_neg_lst, neg_lst, Size(96,160)); 
labels.insert(labels.end(), neg_lst.size(), -1); 
CV_Assert(old < labels.size()); 

compute_hog(pos_lst, gradient_lst, Size(96, 160)); 
compute_hog(neg_lst, gradient_lst, Size(96, 160)); 

train_svm(gradient_lst, labels); 

test_it(Size(96, 160)); // change with your parameters 

return 0; 
} 

const string & prefix代碼，這是什麼參數？你能告訴我嗎？

這是使用使用MinGW

$ train_hog.exe 
OpenCV Error: Bad argument (undeclared key 'C:/Train_HOG/Franksye_dataset/Train/pos/' requested) in getByName, file C:\opencv\sources\module 
s\core\src\command_line_parser.cpp, line 136 
terminate called after throwing an instance of 'cv::Exception' 
    what(): C:\opencv\sources\modules\core\src\command_line_parser.cpp:136: error: (-5) undeclared key 'C:/Train_HOG/Franksye_dataset/Train/p 
os/' requested in function getByName 

Answer 1

我解決了Problem.This是使用cv::CommandLineParser一個代碼錯誤..

int main(int argc, char** argv) 
{ 
    cv::CommandLineParser parser(argc, argv, "{help h|| show help message}" 
      "{@pd|C:/Train_HOG/Franksye_dataset/|pos_dir}{@p|Train/pos.lst|pos.lst}{@nd|C:/Train_HOG/Franksye_dataset/|neg_dir}{@n|Train/neg.lst|neg.lst}"); 
    if (parser.has("help")) 
    { 
     parser.printMessage(); 
     exit(0); 
    } 
    vector<Mat> pos_lst; 
    vector<Mat> full_neg_lst; 
    vector<Mat> neg_lst; 
    vector<Mat> gradient_lst; 
    vector<int> labels; 
    string pos_dir = parser.get<string>("@pd"); 
    string pos = parser.get<string>("@p"); 
    string neg_dir = parser.get<string>("@nd"); 
    string neg = parser.get<string>("@n"); 
    if(pos_dir.empty() || pos.empty() || neg_dir.empty() || neg.empty()) 
    { 
     cout << "Wrong number of parameters." << endl 
      << "Usage: " << argv[0] << " --pd=pos_dir -p=pos.lst --nd=neg_dir -n=neg.lst" << endl 
      << "example: " << argv[0] << " --pd=/INRIA_dataset/ -p=Train/pos.lst --nd=/INRIA_dataset/ -n=Train/neg.lst" << endl; 
     exit(-1);