Qt中顯示OpenCV的IplImage

opencv中的影象型別是IplImage,Qt中是QImage

必須要實現兩者的轉換！。

QImage MainWindow::IplImage2QImage(const IplImage *iplImage, double mini, double maxi) {

    uchar *qImageBuffer = NULL;

    int width = iplImage->width;

    /* Note here that OpenCV image is stored so that each lined is
    32-bits aligned thus
    * explaining the necessity to "skip" the few last bytes of each
    line of OpenCV image buffer.
    */
    int widthStep = iplImage->widthStep;
    int height = iplImage->height;

    switch (iplImage->depth)
    {
    case IPL_DEPTH_8U:
        if(iplImage->nChannels == 1)
        {
            /* OpenCV image is stored with one byte grey pixel. We convert it
                to an 8 bit depth QImage.
                */

            qImageBuffer = (uchar *) malloc(width*height*sizeof(uchar));
            uchar *QImagePtr = qImageBuffer;
            const uchar *iplImagePtr = (const uchar *) iplImage->imageData;

            for(int y = 0; y < height; y++)
            {
                // Copy line by line
                memcpy(QImagePtr, iplImagePtr, width);
                QImagePtr += width;
                iplImagePtr += widthStep;
            }

        }
        else if(iplImage->nChannels == 3)
        {
            /* OpenCV image is stored with 3 byte color pixels (3 channels).
                        We convert it to a 32 bit depth QImage.
                        */
            qImageBuffer = (uchar *) malloc(width*height*4*sizeof(uchar));
            uchar *QImagePtr = qImageBuffer;
            const uchar *iplImagePtr = (const uchar *) iplImage->imageData;
            for(int y = 0; y < height; y++)
            {
                for (int x = 0; x < width; x++)
                {
                    // We cannot help but copy manually.
                    QImagePtr[0] = iplImagePtr[0];
                    QImagePtr[1] = iplImagePtr[1];
                    QImagePtr[2] = iplImagePtr[2];
                    QImagePtr[3] = 0;

                    QImagePtr += 4;
                    iplImagePtr += 3;
                }
                iplImagePtr += widthStep-3*width;
            }

        }
        else
        {
            qDebug("IplImageToQImage: image format is not supported : depth=8U and %d channels ", iplImage->nChannels);
        }
        break;
                case IPL_DEPTH_16U:
        if(iplImage->nChannels == 1)
        {
            /* OpenCV image is stored with 2 bytes grey pixel. We convert it
                to an 8 bit depth QImage.
                */
            qImageBuffer = (uchar *) malloc(width*height*sizeof(uchar));
            uchar *QImagePtr = qImageBuffer;
            //const uint16_t *iplImagePtr = (const uint16_t *);
            const unsigned int *iplImagePtr = (const unsigned int *)iplImage->imageData;
            for (int y = 0; y < height; y++)
            {
                for (int x = 0; x < width; x++)
                {
                    // We take only the highest part of the 16 bit value. It is
                    //similar to dividing by 256.
                    *QImagePtr++ = ((*iplImagePtr++) >> 8);
                }
                iplImagePtr += widthStep/sizeof(unsigned int)-width;
            }
        }
        else
        {
            qDebug("IplImageToQImage: image format is not supported : depth=16U and %d channels ", iplImage->nChannels);

        }
        break;
                case IPL_DEPTH_32F:
        if(iplImage->nChannels == 1)
        {
            /* OpenCV image is stored with float (4 bytes) grey pixel. We
                convert it to an 8 bit depth QImage.
                */
            qImageBuffer = (uchar *) malloc(width*height*sizeof(uchar));
            uchar *QImagePtr = qImageBuffer;
            const float *iplImagePtr = (const float *) iplImage->imageData;
            for(int y = 0; y < height; y++)
            {
                for(int x = 0; x < width; x++)
                {
                    uchar p;
                    float pf = 255 * ((*iplImagePtr++) - mini) / (maxi - mini);
                    if(pf < 0) p = 0;
                    else if(pf > 255) p = 255;
                    else p = (uchar) pf;

                    *QImagePtr++ = p;
                }
                iplImagePtr += widthStep/sizeof(float)-width;
            }
        }
        else
        {
            qDebug("IplImageToQImage: image format is not supported : depth=32F and %d channels ", iplImage->nChannels);
        }
        break;
                   case IPL_DEPTH_64F:
        if(iplImage->nChannels == 1)
        {
            /* OpenCV image is stored with double (8 bytes) grey pixel. We
                    convert it to an 8 bit depth QImage.
                    */
            qImageBuffer = (uchar *) malloc(width*height*sizeof(uchar));
            uchar *QImagePtr = qImageBuffer;
            const double *iplImagePtr = (const double *) iplImage->imageData;
            for(int y = 0; y < height; y++)
            {
                for(int x = 0; x < width; x++)
                {
                    uchar p;
                    double pf = 255 * ((*iplImagePtr++) - mini) / (maxi - mini);

                    if(pf < 0) p = 0;
                    else if(pf > 255) p = 255;
                    else p = (uchar) pf;

                    *QImagePtr++ = p;
                }
                iplImagePtr += widthStep/sizeof(double)-width;
            }
        }
        else
        {
            qDebug("IplImageToQImage: image format is not supported : depth=64F and %d channels ", iplImage->nChannels);
        }
        break;
                default:
        qDebug("IplImageToQImage: image format is not supported : depth=%d and %d channels ", iplImage->depth, iplImage->nChannels);
    }

    QImage qImage;
    QVector<QRgb> vcolorTable;
    if(iplImage->nChannels == 1)
    {
        // We should check who is going to destroy this allocation.
        QRgb *colorTable = new QRgb[256];
        for(int i = 0; i < 256; i++)
        {
            colorTable[i] = qRgb(i, i, i);
            vcolorTable[i] = colorTable[i];
        }
        qImage = QImage(qImageBuffer, width, height, QImage::Format_Indexed8).copy();
        qImage.setColorTable(vcolorTable);
    }
    else
    {
        qImage = QImage(qImageBuffer, width, height, QImage::Format_RGB32).copy();
    }
    free(qImageBuffer);
    return qImage;
}