OpenCV与QT开发时一些转换函数.zip

QT配合OpenCV完成图像处理时，经常使用QT显示OpenCV处理的图像数据，下面列出常用的一些转换函数，方便OpenCV与QT之间转换。 适用的OpenCV的版本：OpenCV3.X和OpenCV2.X版本。 (1) 将QImage图片转为opecv的qimage格式 IplImage *Widget::QImage_to_IplImage(const QImage * qImage) { int width = qImage->width(); int height = qImage->height(); CvSize Size; Size.height = height; Size.width = width; IplImage *IplImageBuffer = cvCreateImage(Size, IPL_DEPTH_8U, 3); for (int y = 0; y < height; ++y) { for (int x = 0; x < width; ++x) { QRgb rgb = qImage->pixel(x, y); CV_IMAGE_ELEM( IplImageBuffer, uchar, y, x*3+0 ) = qBlue(rgb); CV_IMAGE_ELEM( IplImageBuffer, uchar, y, x*3+1 ) = qGreen(rgb); CV_IMAGE_ELEM( IplImageBuffer, uchar, y, x*3+2 ) = qRed(rgb); } } return IplImageBuffer; } (2).  将opecv的图片转为qimage格式 QImage *Widget::IplImage_to_QImage(IplImage *img) { QImage *qmg; uchar *imgData=(uchar *)img->imageData; qmg = new QImage(imgData,img->width,img->height,QImage::Format_RGB888); *qmg=qmg->rgbSwapped(); //BGR格式转RGB return qmg; } (3).  将QImage图片转为Mat格式 Mat Widget::QImage_to_cvMat(QImage image) { Mat mat; switch(image.format()) { case QImage::Format_ARGB32: case QImage::Format_RGB32: case QImage::Format_ARGB32_Premultiplied: mat = Mat(image.height(), image.width(), CV_8UC4, (void*)image.constBits(), image.bytesPerLine()); break; case QImage::Format_RGB888: mat = Mat(image.height(), image.width(), CV_8UC3, (void*)image.constBits(), image.bytesPerLine()); cvtColor(mat, mat, CV_BGR2RGB); break; case QImage::Format_Indexed8: mat = Mat(image.height(), image.width(), CV_8UC1, (void*)image.constBits(), image.bytesPerLine()); break; } return mat; }  (4). 将Mat图片转为QImage格式 QImage Widget::Mat_to_QImage(const Mat& InputMat) { Mat TmpMat; if (InputMat.channels() == 1) { cvtColor(InputMat, TmpMat, CV_GRAY2RGB); } else { cv::cvtColor(InputMat, TmpMat, CV_BGR2RGB); } QImage Result = QImage((const uchar*)(TmpMat.data), TmpMat.cols, TmpMat.rows,QImage::Format_RGB888); Result.bits(); return Result; } (5).  QLabel显示函数 //显示检测的结果 void Widget::show_face(IplImage* img) { uchar *imgData=(uchar *)img->imageData; QImage my_image=QImage(imgData,img->width,img->height,QImage::Format_RGB888); my_image=my_image.rgbSwapped(); //BGR格式转RGB QPixmap my_pix; //创建画图类 my_pix.convertFromImage(my_image); /*在控件上显示*/ ui->label_display->setPixmap(my_pix); } 在QT框架里开发OpenCV，为了方便调用OpenCV里的函数，记得要在头文件声明OpenCV的命名空间，不然每次调用函数都得cv::xxxx。 using namespace cv;