QT下利用OpenCv从摄像头读出图片并显示源码

1、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 <qwidget>#include <highgui.h> #include <cv.h> #include <qtimer> #include <qimage> #include <qpainter> #include &l

2、t;qtgui> #include <qthread> #include <qtnetwork> #include <qapplication>#include “./jpeglib.h“#include “operation.h“ #include “tcpsocket.h“#define port3343/线程类class sendthread : public qthreadpublic:sendthread(void); void run();void setimage(qimage & image);public:send_pictu

3、re *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. 开头采集*3. 显示*4. 暂停*/class camera_operation : public qdialogq_objectpublic:camera_operation(qwidget *parent = 0,int i=0);camera_operation();qtabwidget *tabwidget; qwidget *mainwidget; qwidget *twowidget; cvcapture *capture; iplimage

4、*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

5、(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 <qtgui> #include “highgui.h“ #include “cv.h“ #include <qtimer> #include <qimage> #include &

6、lt;qpainter> #include <qtgui>#include <qapplication> #include <qdebug>#include “camera.h“ #include “./def.h“#define jpeg_quality 80char * 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 co

7、lumns 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

8、_error(&jerr); jpeg_create_compress(&cinfo); jpeg_mem_dest(&cinfo,&target,&size);/指定宽度，高度，rgbcinfo.image_width = 320;cinfo.image_height = 240;cinfo.input_components = 3; cinfo.in_color_space = jcs_rgb;/接受默认设置jpeg_set_defaults(&cinfo);/设置图片质量jpeg_set_quality(&cinfo, 80, tr

9、ue);/开头压缩jpeg_start_compress(&cinfo, true); row_stride = cinfo.image_width * 3;while (cinfo.next_scanline < cinfo.image_height) row_pointer0 =(jsamprow) & buffercinfo.next_scanline * row_stride; (void) jpeg_write_scanlines(&cinfo, row_pointer, 1);jpeg_finish_compress(&cinfo); jpeg

10、_destroy_compress(&cinfo);return size;sendthread : sendthread(void)socket = new send_picture(3343);/*线程 run 方法，用来发送图片到上位机*/void sendthread : run(void)if(socket -> state = connect_on) qbytearray pic;qbuffer buffer(&pic); buffer.open(qiodevice:readwrite); val.save(&buffer, “png“);qdebug

11、() << buffer.size(); socket -> write(pic);void sendthread : setimage(qimage & image)val = image;camera_operation : camera_operation(qwidget *parent,int i) : qdialog(parent)setgeometry(winxstart,winystart,usewinwide,usewinhigh);/ mainwidget = new qwidget();play = new qpushbutton(“play“,t

12、his); 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 qpushbut

13、ton(“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(

14、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(t

15、imeout(),this,slot(read_camera();/ socket = new send_picture(3343); timer -> start(30);camera_operation : camera_operation()cvreleaseimage(&frame);/释放cvreleasecapture(&capture);/*保存图片到 nand flash 下/home/picture 名目,文件名从 1.png 开头递增，文件最大数量 199*/void camera_operation : save_camera(void)static

16、 int i=0;char filename25; if(i>200)i=0;i+;sprintf(filename,“/home/picture/%d.bmp“,i); qdebug() << filename; image.save(filename);/*开头播放，打开定时器*/void camera_operation : play_camera(void)/ starttimer(50); timer -> start(30);/*暂停播放，停止定时器*/void camera_operation : puspend_camera(void)timer -&g

17、t; stop();/ cvreleaseimage(&frame);void camera_operation : return_home(void)timer -> stop(); cvreleaseimage(&frame);/释放cvreleasecapture(&capture); 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)qmessa

18、gebox:about(this,“warning“,“can”t 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(&jerr); jpeg_creat

19、e_compress(&cinfo);jpeg_mem_dest(&cinfo,(unsigned char*)&(image_buffer),&size);/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;/接受默认设置jpeg_set_defaults(&cinfo);/设置图片质量jpeg_set_qual

20、ity(&cinfo, 80, true);/开头压缩jpeg_start_compress(&cinfo, true); row_stride = cinfo.image_width * 3;while (cinfo.next_scanline < cinfo.image_height) row_pointer0 =(jsamprow) & frame->imagedatacinfo.next_scanline * row_stride;(void) jpeg_write_scanlines(&cinfo, row_pointer, 1);jpeg

21、_finish_compress(&cinfo); jpeg_destroy_compress(&cinfo);printf(“%dn“,size);qdebug() << “size = “ ; qdebug() << size;qdebug() << “width = “ ; qdebug() << frame->width; qdebug() << “height = “ ; qdebug() << frame->height;qimage qimage(uchar *)frame->imagedata, frame->width, frame->height, fra