研究手写识别的时候看到了zinnia，就进行了测试，存在问题是zinnia书写依赖笔画顺序，而且没有找到更多的可以用于训练的数据。

zinnia介绍

   zinnia是一个基于svm的开源的手写识别库。zinnia简单地接收用户笔划作为一系列坐标数据，并输出按SVM置信度排序的n个**字符。为了保持可移植性，Zinnia没有任何渲染功能。此外，Zinnia还提供训练模块，使我们能够以低成本创建任何手写识别系统。

特点

• 支持向量机的实用精度
• 便携紧凑的设计 - POSIX / Windows（取决于C ++ / STL）
• 线程安全的C / C ++ / Perl / Ruby / Python库
• 实用识别速度（50-100字符 /秒）
• 快速训练

      参考 zinnia的介绍：http://taku910.github.io/zinnia/

      zinnia属于联机文字识别，包含预处理、特征提取和分类识别过程。

      https://blog.csdn.net/stellar0/article/details/

zinnia的使用

编译zinnia

从git上下载源码https://github.com/taku910/zinnia

打开VS2017命令行工具，进入zinnia源码文件目录

讯享网

编译，使用指令”nmake -f Makefile.msvc”

生成 zinnia.lib,zinnia.dll文件。

使用zinnia：

1.创建zinnia::Recognizer，加载model文件

2.创建zinnia::Character，把书写的点坐标传进来

3.zinnia::Recognizer进行识别，得到一组包含识别的字和对应相似度的结果

注意点：

1.书写顺序会影响识别的结果，导致结果特别不准确

2.zinnia::Character需要设置字符的高宽，当只在一个小的区域书写，设置高宽很大时，相当于拿这个小的区域去和一个字的一部分去比较，取出最相近的。所以代码里面有根据点来确定一个区域，根据此区域设置zinnia::Character的高宽。

代码

.h文件：

#ifndef PAINTWIDGET_H #define PAINTWIDGET_H #include <QWidget> #include <QMap> class PaintWidget : public QWidget { Q_OBJECT public: explicit PaintWidget(QWidget *parent = nullptr); void clear(); void init(); void recignize(); protected: void paintEvent(QPaintEvent *event); void mousePressEvent(QMouseEvent *event); void mouseMoveEvent(QMouseEvent * e); void mouseReleaseEvent(QMouseEvent * e); bool event(QEvent *event); private: void resizeRect(QPoint p); void adjustPoints(); signals: void sigResult(QMap<QString, float> result); public slots: private: QImage *m_pCanvas = nullptr; QPainter *m_pPainter = nullptr;//临时画布的painter QPoint m_posLast; QMap<QString, float> m_result; QRect m_rect; std::vector<QPoint> m_vecPoints; //一个笔画所含的点，目前是把 std::vector<std::vector<QPoint>> m_vecPointsList; // 里面的vector为一个笔画，外面一层为所有笔画集合 }; #endif // PAINTWIDGET_H

.cpp文件：

讯享网#include "paintwidget.h" #include <QPainter> #include <QDebug> #include <QImage> #include <QMouseEvent> #include <QApplication> #include "zinnia/zinnia.h" PaintWidget::PaintWidget(QWidget *parent) : QWidget(parent) { } void PaintWidget::init() { m_pCanvas = new QImage(this->size(),QImage::Format_ARGB32_Premultiplied); m_pCanvas->fill(Qt::transparent); qInfo()<<this->size(); m_pPainter = new QPainter(m_pCanvas); // m_pPainter->setPen(Qt::black); m_pPainter->setRenderHint(QPainter::Antialiasing, true); m_pPainter->setCompositionMode(QPainter::CompositionMode_Source); m_pPainter->setPen(QPen(Qt::red,3, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin)); } void PaintWidget::clear() { m_vecPointsList.clear(); m_pCanvas->fill(Qt::transparent); update(); } void PaintWidget::recignize() { // 汉字识别 zinnia::Recognizer *recognizer = zinnia::Recognizer::create(); QString strPath = QApplication::applicationDirPath()+"/handwriting-zh_CN.model"; qInfo()<<__FUNCTION__<<strPath; /*初始化汉字库*/ if (!recognizer->open( strPath.toStdString().data() )){ qInfo()<<__FUNCTION__<<"open model fail"; return; } zinnia::Character *character = zinnia::Character::create(); if(m_vecPointsList.size()<=0){ qInfo()<<__FUNCTION__<<"no points"; return; } character->clear(); // character->set_width(this->width()); // character->set_height(this->height()); qInfo()<<m_rect; character->set_width(m_rect.width()); character->set_height(m_rect.height()); adjustPoints(); for ( unsigned int i = 0 ; i < m_vecPointsList.size() ; i++ ) { std::vector<QPoint> vecTmp = m_vecPointsList[i]; for ( unsigned int j = 0 ; j < vecTmp.size() ; j++ ) { character->add( i , vecTmp[j].x() , vecTmp[j].y() ); } } zinnia::Result *result = recognizer->classify( *character , m_vecPointsList.size()/*m_vecPoints.size() / 2 +1*/ ); if ( !result ) return; m_result.clear(); for ( size_t i = 0 ; i < result->size() ; ++i ) { std::string str1 = result->value(i); float score = result->score(i); QString qs = str1.c_str(); qInfo()<<qs<<score; m_result.insert(qs, score); } emit sigResult(m_result); delete result; delete character; delete recognizer; m_vecPoints.clear(); m_vecPointsList.clear(); } void PaintWidget::paintEvent(QPaintEvent *event) { QPainter painter(this); painter.drawImage(0,0,*m_pCanvas); } void PaintWidget::mousePressEvent(QMouseEvent *event) { QPoint pos = event->pos(); qInfo()<<"mouse press"<<pos; m_posLast = pos; m_pPainter->drawPoint(pos); resizeRect(pos); m_vecPoints.push_back(pos); } void PaintWidget::mouseMoveEvent(QMouseEvent *event) { QPoint pos = event->pos(); m_pPainter->drawLine(m_posLast, pos); m_vecPoints.push_back(pos); m_posLast = pos; resizeRect(pos); update(); } void PaintWidget::mouseReleaseEvent(QMouseEvent *event) { qInfo()<<__FUNCTION__<<event->pos(); m_vecPointsList.push_back( m_vecPoints ); m_vecPoints.clear(); } bool PaintWidget::event(QEvent *event) { switch(event->type()){ case QEvent::TouchBegin: mousePressEvent(static_cast<QMouseEvent*>(event)); break; case QEvent::TouchUpdate: mouseMoveEvent(static_cast<QMouseEvent*>(event)); break; case QEvent::TouchEnd: mouseReleaseEvent(static_cast<QMouseEvent*>(event)); break; } return QWidget::event(event); } void PaintWidget::resizeRect(QPoint p) { if(m_vecPointsList.size() == 0 && m_vecPoints.size()==0){ m_rect.setTopLeft(p); m_rect.setBottomRight(p); qInfo()<<__FUNCTION__<<"first point"; } else{ int x = p.x(); int y = p.y(); if(x<m_rect.left()){ m_rect.setLeft(x); } else if(x>m_rect.right()){ m_rect.setRight(x); } if(y<m_rect.top()){ m_rect.setTop(y); } else if(y>m_rect.bottom()){ m_rect.setBottom(y); } } } void PaintWidget::adjustPoints() { int x = m_rect.left(); int y = m_rect.top(); for (unsigned int i = 0 ; i < m_vecPointsList.size() ; i++) { std::vector<QPoint> vecTmp = m_vecPointsList[i]; for (unsigned int j = 0 ; j < vecTmp.size() ; j++) { QPoint p = m_vecPointsList[i][j]; m_vecPointsList[i][j] = QPoint(p.x()-x, p.y()-y); } } }