qt下利用opencv从摄像头读出图片并显示源码

QT下利用 OpenCv从摄像头读出图片并显示源 码 2012-09-30 11:59:32| 分类： QT and QTOPIA | 标签：camera opencv qt |举报| 字号 订阅 /* *camera.h */ #ifndef _DEMO_H_ #define _DEMO_H_ #include #include #include #include #include #include #include #include #include #include #include “/jpeglib.h“ #include “operation.h“ #include “tcpsocket.h“ #define PORT 3343 /线程类 class SendThread : public QThread public: SendThread(void); void run(); void setImage(QImage public: Send_picture *socket; QImage val; ; /* * *Camera_Operation 类，用来显示摄像头图像采集界面 *1. 打开摄像头 *2. 开始采集 *3. 显示 *4. 暂停 * */ class Camera_Operation : public QDialog Q_OBJECT public: Camera_Operation(QWidget *parent = 0,int i=0); Camera_Operation(); QTabWidget *tabwidget; QWidget *mainwidget; QWidget *twowidget; CvCapture *capture; IplImage *frame; QImage image; QTimer *timer; QPushButton *save; QPushButton *play; QPushButton *puspend; QPushButton *learn; QPushButton *judge; QPushButton *add; QPushButton *creturn; / QUdpSocket *socket; /UDP 协议，传图片 Send_picture *socket; SendThread *thread; public slots: void save_camera(void); void play_camera(void); void puspend_camera(void); void read_camera(void); void return_home(void); protected: void timerEvent(QTimerEvent *event); void paintEvent(QPaintEvent *); ; #endif /- /* *camera.cpp */ #include #include “highgui.h“ #include “cv.h“ #include #include #include #include #include #include #include “camera.h“ #include “/def.h“ #define JPEG_QUALITY 80 char * image_buffer; /* Points to large array of R,G,B-order data */ int image_height; /* Number of rows in image */ int image_width; /* Number of columns in image */ /* 函数名字：write_JPEG_file 函数功能：压缩一张图片到内存 参 数： 返 回 值： */ unsigned long write_JPEG_file (unsigned char *target, char *buffer, int width, int height ) struct jpeg_compress_struct cinfo; struct jpeg_error_mgr jerr; JSAMPROW row_pointer1; int row_stride; unsigned long size; /指定错误处理器 cinfo.err = jpeg_std_error( jpeg_create_compress( jpeg_mem_dest( /指定宽度，高度，RGB cinfo.image_width = 320; cinfo.image_height = 240; cinfo.input_components = 3; cinfo.in_color_space = JCS_RGB; /采用默认设置 jpeg_set_defaults( /设置图片质量 jpeg_set_quality( /开始压缩 jpeg_start_compress( row_stride = cinfo.image_width * 3; while (cinfo.next_scanline state = CONNECT_ON) QByteArray pic; QBuffer buffer( buffer.open(QIODevice:ReadWrite); val.save( qDebug() Write(pic); void SendThread : setImage(QImage Camera_Operation : Camera_Operation(QWidget *parent,int i) : QDialog(parent) setGeometry(winxstart,winystart,Usewinwide,Usewinhigh); / mainwidget = new QWidget(); play = new QPushButton(“play“,this); play - setGeometry(10,20,75,40); puspend = new QPushButton(“puspend“,this); puspend - setGeometry(10,70,75,40); save = new QPushButton(“save“,this); save - setGeometry(10,120,75,40); creturn = new QPushButton(“return“,this); creturn - setGeometry(10,170,75,40); learn = new QPushButton(“learn“,this); learn - setGeometry(270,220,65,40); judge = new QPushButton(“judge“,this); judge - setGeometry(340,220,65,40); add = new QPushButton(“add“,this); add - setGeometry(410,220,65,40); timer = new QTimer(this); / if(i=0) if(!(capture = cvCreateCameraCapture(-1) QMessageBox:about(this,“warning“,“cant open the camero“); return; / connect(save,SIGNAL(clicked(),this,SLOT(save_camera(); connect(play,SIGNAL(clicked(),this,SLOT(play_camera(); connect(puspend,SIGNAL(clicked(),this,SLOT(puspend_camera(); connect(creturn,SIGNAL(clicked(),this,SLOT(return_home(); connect(timer,SIGNAL(timeout(),this,SLOT(read_camera(); / socket = new Send_picture(3343); timer - start(30); Camera_Operation : Camera_Operation() cvReleaseImage( /释放 cvReleaseCapture( /* * *保存图片到 Nand Flash 下/home/picture 目录,文件名从 1.png 开始递增，文 件最大数量 199 * */ void Camera_Operation : save_camera(void) static int i=0; char fileName25; if(i200)i=0; i+; sprintf(fileName,“/home/picture/%d.bmp“,i); qDebug() start(30); /* * *暂停播放，停止定时器 * */ void Camera_Operation : puspend_camera(void) timer - stop(); / cvReleaseImage( void Camera_Operation : return_home(void) timer - stop(); cvReleaseImage( /释放 cvReleaseCapture( close(); /* * *从摄像头中读取一张图片，并保存到 QImage 中 * */ void Camera_Operation : read_camera(void) char *buffer; frame=cvQueryFrame(capture); if(frame=0) QMessageBox:about(this,“warning“,“Cant query the frame“); timer - stop(); return; /图像编码 image_buffer = (char*)malloc(512*1025); struct jpeg_compress_struct cinfo; struct jpeg_error_mgr jerr; JSAMPROW row_pointer1; int row_stride; unsigned long size; /指定错误处理器 cinfo.err = jpeg_std_error( jpeg_create_compress( jpeg_mem_dest( /指定宽度，高度，RGB cinfo.image_width = frame-width; cinfo.image_height = frame-height; cinfo.input_components = 3; cinfo.in_color_space = JCS_RGB; /采用默认设置 jpeg_set_defaults( /设置图片质量 jpeg_set_quality( /开始压缩 jpeg_start_compress( row_stride = cinfo.image_width * 3; while (cinfo.next_scanline imageDatacinfo.next_scanline * row_stride; (void) jpeg_write_scanlines( jpeg_finish_compress( jpeg_destroy_compress( printf(“%dn“,size); qDebug() width; qDebug() height; QImage qImage(uchar *)frame-imageData, frame-width, frame-height, frame-widthStep, QImage:Format_RGB888); image=qImage.scaled(200,200); /当读到图片的时候就发送 /* if(socket - state = CONNECT_ON) socket - Write(image_buffer,size); */ free(image_buffer); timer - start(30); update (); /采集到后更新界面 /实现定时器函数 void Camera_Operation : timerEvent(QTimerEvent *event) frame=cvQueryFrame(capture); if(frame=0) QMessageBox:about(this,“warning“,“Cant query the frame“); return; QImage qImage(uchar *)frame-