The IplImage and Qt
In order to take advantage of the 500 algorithms offered by OpenCV, Qt applications have to manage ? iplImages . Therefore, converting ? QImage to/from ? iplImage ? is very important.
Converting QImage to iplImage
This snippet will convert ? QImages ? into ? iplImage ? with depth 8 and 3 channels. ? QImage ? can store data in several formats. This code accepts just 24-bit ? QImage::Format_RGB888 ? and the QImage::Format_RGB32 . Apha values in the 32-bit format will be removed during the conversion.
static IplImage* qImage2IplImage(const QImage& qImage) { int width = qImage.width(); int height = qImage.height(); // Creates a iplImage with 3 channels IplImage *img = cvCreateImage(cvSize(width, height), IPL_DEPTH_8U, 3); char * imgBuffer = img->imageData; //Remove alpha channel int jump = (qImage.hasAlphaChannel()) ? 4 : 3; for (int y=0;y<img->height;y++){ QByteArray a((const char*)qImage.scanLine(y), qImage.bytesPerLine()); for (int i=0; i<a.size(); i+=jump){ //Swap from RGB to BGR imgBuffer[2] = a[i]; imgBuffer[1] = a[i+1]; imgBuffer[0] = a[i+2]; imgBuffer+=3; } } return img; }
Converting iplImage to QImage
This snippet will convert a ? iplImage ? with depth 8 and 1 or 3 channels into a 8/24-bit ? QImage .
static QImage IplImage2QImage(const IplImage *iplImage) { int height = iplImage->height; int width = iplImage->width; if (iplImage->depth == IPL_DEPTH_8U && iplImage->nChannels == 3) { const uchar *qImageBuffer = (const uchar*)iplImage->imageData; QImage img(qImageBuffer, width, height, QImage::Format_RGB888); return img.rgbSwapped(); } else if (iplImage->depth == IPL_DEPTH_8U && iplImage->nChannels == 1){ const uchar *qImageBuffer = (const uchar*)iplImage->imageData; QImage img(qImageBuffer, width, height, QImage::Format_Indexed8); QVector<QRgb> colorTable; for (int i = 0; i < 256; i++){ colorTable.push_back(qRgb(i, i, i)); } img.setColorTable(colorTable); return img; }else{ qWarning() << "Image cannot be converted."; return QImage(); } }
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http://www.developer.nokia.com/Community/Wiki/Using_OpenCV_with_Qt
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