ORBSLAM2 Win10 VS2017 二进制词袋修改

• 前言
• 词袋下载
• TemplatedVocabulary.h 文件修改
• System.cc 文件修改

  资料汇总，步骤记录，仅供参考。

  前往 https://github.com/nxyzgf/sgg-dbow2 下载ORBvoc.bin

  首先在第240行左右，loadFromTextFile函数的声明下增加如下声明：

  
  bool loadFromTextFile(const std::string &filename);
  

  bool loadFromBinaryFile(const std::string &filename);

&esmp; 然后基于上述修改过后的第1430行左右，添加loadFromBinaryFile函数的定义：

template
bool TemplatedVocabulary::loadFromBinaryFile(const std::string &filename) {
	fstream f;
	f.open(filename.c_str(), ios_base::in | ios::binary);
	unsigned int nb_nodes, size_node;
	f.read((char*)&nb_nodes, sizeof(nb_nodes));
	f.read((char*)&size_node, sizeof(size_node));
	f.read((char*)&m_k, sizeof(m_k));
	f.read((char*)&m_L, sizeof(m_L));
	f.read((char*)&m_scoring, sizeof(m_scoring));
	f.read((char*)&m_weighting, sizeof(m_weighting));
	createScoringObject();

	m_words.clear();
	m_words.reserve(pow((double)m_k, (double)m_L + 1));
	m_nodes.clear();
	m_nodes.resize(nb_nodes + 1);
	m_nodes[0].id = 0;
	char buf[size_node]; int nid = 1;
	while (!f.eof()) {
		f.read(buf, size_node);
		m_nodes[nid].id = nid;
		// FIXME
		const int* ptr = (int*)buf;
		m_nodes[nid].parent = *ptr;
		//m_nodes[nid].parent = *(const int*)buf;
		m_nodes[m_nodes[nid].parent].children.push_back(nid);
		m_nodes[nid].descriptor = cv::Mat(1, F::L, CV_8U);
		memcpy(m_nodes[nid].descriptor.data, buf + 4, F::L);
		m_nodes[nid].weight = *(float*)(buf + 4 + F::L);
		if (buf[8 + F::L]) { // is leaf
			int wid = m_words.size();
			m_words.resize(wid + 1);
			m_nodes[nid].word_id = wid;
			m_words[wid] = &m_nodes[nid];
		}
		else
			m_nodes[nid].children.reserve(m_k);
		nid += 1;
	}
	f.close();
	return true;
}

// --------------------------------------------------------------------------

  在第65行左右，将对应的调用修改如下：

    mpVocabulary = new ORBVocabulary();
    // bool bVocLoad = mpVocabulary->loadFromTextFile(strVocFile);
    bool bVocLoad = mpVocabulary->loadFromBinaryFile(strVocFile);
    if(!bVocLoad)
    {
        cerr << "Wrong path to vocabulary. " << endl;
        cerr << "Falied to open at: " << strVocFile << endl;
        exit(-1);
    }