1. QString轉換String

string s = qstr.toStdString();

2.String轉換QString

QString qstr2 = QString::fromStdString(s);

3.mat與qimage互轉

QImage cvMat2QImage(const cv::Mat& mat) {// 8-bits unsigned, NO. OF CHANNELS = 1if(mat.type() == CV_8UC1){QImage image(mat.cols, mat.rows, QImage::Format_Indexed8);// Set the color table (used to translate colour indexes to qRgb values)image.setNumColors(256);for(int i = 0; i < 256; i++){image.setColor(i, qRgb(i, i, i));}// Copy input Matuchar *pSrc = mat.data;for(int row = 0; row < mat.rows; row ++){uchar *pDest = image.scanLine(row);memcpy(pDest, pSrc, mat.cols);pSrc += mat.step;}return image;}// 8-bits unsigned, NO. OF CHANNELS = 3else if(mat.type() == CV_8UC3){// Copy input Matconst uchar *pSrc = (const uchar*)mat.data;// Create QImage with same dimensions as input MatQImage image(pSrc, mat.cols, mat.rows, mat.step, QImage::Format_RGB888);return image.rgbSwapped();}else if(mat.type() == CV_8UC4){// Copy input Matconst uchar *pSrc = (const uchar*)mat.data;// Create QImage with same dimensions as input MatQImage image(pSrc, mat.cols, mat.rows, mat.step, QImage::Format_ARGB32);return image.copy();}else{return QImage();} }

4. QImage轉Mat

Mat QImage2cvMat(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());cv::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; }

5.QImage與QPixmap互轉

QPainter p(this);QPixmap pixmap;pixmap.load("../image/路飛.jpg");//QPixmap->QImageQImage tempImage = pixmap.toImage();p.drawImage(0,0,tempImage);QImage image;image.load("../image/路飛.jpg");//QImage->QPixmapQPixmap tempPixmap = QPixmap::fromImage(image);p.drawPixmap(450,0,tempPixmap);

總結

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