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[Qt5] Develop openCV3 by QML on Qt-creator

2024-08-23 00:59:20   223人阅读

QML的酷炫控件，适合移动设备开发。

qt-creator的跨平台是QML与opencv的粘合剂。

 

关键：

QImage有若干种格式，转化为相应的Mat。

Mat处理完后，还要正确得还原为原来格式的QImage。

关键在于：QImage2cvMat(image);cvmat2qimage(mat);的定义。

 

图像格式的转化:

static void _gray(QString sourceFile, QString destFile)
{  
    QImage image(sourceFile);    if(image.isNull())    {        qDebug() << "load " << sourceFile << " failed! ";        return;    }    qDebug() << "depth - " << image.depth();#if 1    /* test */    qDebug() << "Let‘s openCV." << endl;    cv::Mat mat = QImage2cvMat(image);    cvtColor(mat, mat ,CV_BGR2GRAY);    image = cvmat2qimage(mat);    qDebug() << "openCV done." << endl;#else
　　/*
　　/* 就没必要使用/关心 QT自身的图像处理接口。
　　 */

    int width = image.width();    int height = image.height();    QRgb color;    int gray;    for(int i = 0; i < width; i++)    {        for(int j= 0; j < height; j++)        {            color = image.pixel(i, j);            gray = qGray(color);            image.setPixel(i, j, qRgba(gray, gray, gray, qAlpha(color)));        }    }#endif    image.save(destFile);}

 

常用的tool_function:

/* 1. Qimage --> Mat */cv::Mat QImage2cvMat(QImage image){    cv::Mat mat;    qDebug() << image.format();    switch(image.format())    {    case QImage::Format_ARGB32:    case QImage::Format_RGB32:    case QImage::Format_ARGB32_Premultiplied:        mat = cv::Mat(image.height(), image.width(), CV_8UC4, (void*)image.constBits(), image.bytesPerLine());        break;
    case QImage::Format_RGB888:        mat = cv::Mat(image.height(), image.width(), CV_8UC3, (void*)image.constBits(), image.bytesPerLine());        cv::cvtColor(mat, mat, CV_BGR2RGB);        break;
    case QImage::Format_Indexed8:        mat = cv::Mat(image.height(), image.width(), CV_8UC1, (void*)image.constBits(), image.bytesPerLine());        break;
    default:        qDebug() << "What‘s the format?";        break;    }    return mat;}/* 2. Mat --> Qimage */QImage cvMat2QImage(const cv::Mat& mat){    // 8-bits unsigned, NO. OF CHANNELS = 1    if(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.setColorCount(256);        for(int i = 0; i < 256; i++)        {            image.setColor(i, qRgb(i, i, i));        }        // Copy input Mat        uchar *pSrc =http://www.mamicode.com/ 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 = 3    else if(mat.type() == CV_8UC3)    {        // Copy input Mat        const uchar *pSrc = http://www.mamicode.com/(const uchar*)mat.data;        // Create QImage with same dimensions as input Mat        QImage image(pSrc, mat.cols, mat.rows, mat.step, QImage::Format_RGB888);        return image.rgbSwapped();    }    else if(mat.type() == CV_8UC4)    {        qDebug() << "CV_8UC4";        // Copy input Mat        const uchar *pSrc = http://www.mamicode.com/(const uchar*)mat.data;        // Create QImage with same dimensions as input Mat        QImage image(pSrc, mat.cols, mat.rows, mat.step, QImage::Format_ARGB32);        return image.copy();    }    else    {        qDebug() << "ERROR: Mat could not be converted to QImage.";        return QImage();    }}

 

[Qt5] Develop openCV3 by QML on Qt-creator


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