电脑摄像头拍照

一个简陋的摄像头拍照工具，能将拍到的照片保存为.png文件。

使用Qt+openCV实现。

#include "qtusecamera.h"#include<opencv/cv.h>#include<opencv/highgui.h>#include<windows.h>QtUseCamera::QtUseCamera(QWidget *parent, Qt::WFlags flags): QWidget(parent, flags){preReadLabel = new QLabel;photoLabel =new QLabel;    openBut = new QPushButton("打开");    takeBut = new QPushButton("拍照");    closeBut=new QPushButton("关闭");    saveBut=new QPushButton("保存");labelLayout=new QHBoxLayout;butLayout=new QHBoxLayout;mainLayout=new QVBoxLayout;labelLayout->addWidget(preReadLabel);labelLayout->addWidget(photoLabel);butLayout->addWidget(openBut);butLayout->addWidget(takeBut);    butLayout->addStretch();    butLayout->addWidget(saveBut);    butLayout->addWidget(closeBut);    butLayout->setContentsMargins(10,5,10,5);mainLayout->addLayout(labelLayout);mainLayout->addLayout(butLayout);mainLayout->setSpacing(1);mainLayout->setContentsMargins(0,0,0,0);setLayout(mainLayout);timer=new QTimer;connect(openBut,SIGNAL(clicked()),this,SLOT(openCamera()));connect(takeBut,SIGNAL(clicked()),this,SLOT(takingPictures()));connect(closeBut,SIGNAL(clicked()),this,SLOT(closeCamera()));connect(timer,SIGNAL(timeout()),this,SLOT(readFrame()));    connect(saveBut,SIGNAL(clicked()),this,SLOT(savePic()));cam=NULL;    resize(200,200);    setWindowTitle("摄像头拍照");}QtUseCamera::~QtUseCamera(){cvReleaseCapture(&cam);}void QtUseCamera::openCamera(){cam = cvCreateCameraCapture(0);Sleep(1000);timer->start(30);}void QtUseCamera::readFrame(){if(!cam) return ;frame = cvQueryFrame(cam);QImage image = QImage((const uchar*)frame->imageData,frame->width,frame->height, QImage::Format_RGB888).rgbSwapped();preReadLabel->setPixmap(QPixmap::fromImage(image));}void QtUseCamera::closeCamera(){timer->stop();cvReleaseCapture(&cam);    preReadLabel->setPixmap(QPixmap());    photoLabel->setPixmap(QPixmap());    takePic=QImage();    resize(200,200);}void QtUseCamera::takingPictures(){if(!cam) return ;frame = cvQueryFrame(cam);    takePic = QImage((const uchar*)frame->imageData,frame->width,frame->height, QImage::Format_RGB888).rgbSwapped();    photoLabel->setPixmap(QPixmap::fromImage(takePic));}void QtUseCamera::savePic(){    if(takePic.isNull()) return ;    QString fileName=QFileDialog::getSaveFileName(this,"保存照片",QString(),"png file(*.png)");    if(fileName.isEmpty()) return ;    takePic.save(fileName,"png",100);}

http://download.csdn.net/detail/thatmaybefun/7025779