第Qt+OpenCV實現(xiàn)目標檢測詳解QStringfilename=QFileDialog::getOpenFileName(this,"打開文件",".","*.mp4*.avi;;*.png*.jpg*.jpeg*.bmp");

if(!QFile::exists(filename)){

return;

ui-statusbar-showMessage(filename);

IsDetect_ok+=1;

if(IsDetect_ok==2)

ui-pushButton_StartDetect-setEnabled(true);

QMimeDatabasedb;

QMimeTypemime=db.mimeTypeForFile(filename);

if(().startsWith("image/")){

cv::Matsrc=cv::imread(filename.toLatin1().data());

if(src.empty()){

ui-statusbar-showMessage("圖像不存在！");

return;

cv::Mattemp;

if(src.channels()==4)

cv::cvtColor(src,temp,cv::COLOR_BGRA2RGB);

elseif(src.channels()==3)

cv::cvtColor(src,temp,cv::COLOR_BGR2RGB);

else

cv::cvtColor(src,temp,cv::COLOR_GRAY2RGB);

QImageimg=QImage((uchar*)temp.data,temp.cols,temp.rows,temp.step,QImage::Format_RGB888);

ui-label_raw-setPixmap(QPixmap::fromImage(img));

ui-label_raw-resize(ui-label_raw-pixmap()-size());

filename.clear();

}elseif(().startsWith("video/")){

capture-open(filename.toLatin1().data());

if(!capture-isOpened()){

ui-textEdit_log-append("failtoopenMP4!");

return;

ui-textEdit_log-append(QString::fromUtf8("Openvideo:%1succesfully!").arg(filename));

//獲取整個幀數(shù)

longtotalFrameNumber=capture-get(CV_CAP_PROP_FRAME_COUNT);

ui-textEdit_log-append(QString::fromUtf8("整個視頻共%1幀").arg(totalFrameNumber));

ui-label_raw-resize(QSize(capture-get(CV_CAP_PROP_FRAME_WIDTH),capture-get(CV_CAP_PROP_FRAME_HEIGHT)));

//設置開始幀()

longframeToStart=0;

capture-set(CV_CAP_PROP_POS_FRAMES,frameToStart);

ui-textEdit_log-append(QString::fromUtf8("從第%1幀開始讀").arg(frameToStart));

//獲取幀率

doublerate=capture-get(CV_CAP_PROP_FPS);

ui-textEdit_log-append(QString::fromUtf8("幀率為:%1").arg(rate));

voidMainWindow::on_pushButton_StartDetect_clicked()

timer-start();

ui-pushButton_StartDetect-setEnabled(false);

ui-pushButton_StopDetect-setEnabled(true);

voidMainWindow::on_pushButton_StopDetect_clicked()

ui-pushButton_StartDetect-setEnabled(true);

ui-pushButton_StopDetect-setEnabled(false);

timer-stop();

voidMainWindow::on_pushButton_FlushDevice_clicked()

QStringxmlfilename=QFileDialog::getOpenFileName(this,"打開文件",".","*.xml");

if(!QFile::exists(xmlfilename)){

return;

ui-statusbar-showMessage(xmlfilename);

if(!classifier-load(xmlfilename.toLatin1().data())){

ui-textEdit_log-append("failtoopenclassifier_path!");

return;

IsDetect_ok+=1;

ui-textEdit_log-append(QString::fromUtf8("Openxmlfile:%1succesfully!").arg(xmlfilename));

if(IsDetect_ok==2)

ui-pushButton_StartDetect-setEnabled(true);

}

演示效果

拓展閱讀

直接在屬性欄目搜索中設置（如下圖），或者pushbutton設置icon和文字

下面是pushbutton設置icon和文字的四種方法詳解

1.使用系統(tǒng)自帶api

ui-pushButton-setIconSize(QSize(32,32));

ui-pushButton-setIcon(QIcon(":/images/Setting.png"));

ui-pushButton-setText(QString::fromLocal8Bit("系統(tǒng)設置"));

ui-pushButton-setStyleSheet("QPushButton{border:1pxsolidblue;background:white;}"

"QPushButton:hover{border:0px;background:blue;}"

"QPushButton:pressed{border:0px;background:red;}");

無法設置icon和文字之間的距離。

2.如果想讓icon顯示在文字上方可使用QToolButton

ui-toolButton-setIconSize(QSize(32,32));

ui-toolButton-setIcon(QIcon(":/images/Setting.png"));

ui-toolButton-setText(QString::fromLocal8Bit("系統(tǒng)設置"));

ui-toolButton-setToolButtonStyle(Qt::ToolButtonTextUnderIcon);

3.在pushbutton上面使用label進行布局

QLabel*iconLabel=newQLabel;

QLabel*textLabel=newQLabel;

iconLabel-setFixedSize(32,32);

iconLabel-setStyleSheet("border:1pxsolidred;");

textLabel-setStyleSheet("border:1pxsolidred;");

iconLabel-setPixmap(QPixmap(":/images/Setting.png"));

textLabel-setText(QString::fromLocal8Bit("系統(tǒng)設置"));

textLabel-setFixedWidth(60);

QHBoxLayout*myLayout=newQHBoxLayout();

myLayout-addSpacing(10);

myLayout-addWidget(iconLabel);

myLayout-addSpacing(30);

myLayout-addWidget(textLabel);

myLayout-addStretch();

ui-pushButton_2-setLayout(myLayout);

ui-pushButton_2-setStyleSheet("QPushButton{border:1