图像灰度化的四种方法

原创

303103757q 2022-08-16 16:41:09 博主文章分类：QT ©著作权

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//浮点算法：Gray=R*0.3+G*0.59+B*0.11
void MainWindow::toGrayFloat(QImage *image, QImage *ImageBetter)
{
    int height = image->height();
    int width = image->width();
    QRgb rgb00,rgb01;
    int ta = 0, tr = 0, tg = 0, tb = 0;
    for(int i = 0; i < width; i ++){
        for(int j = 0; j < height; j ++){
            rgb00 = image->pixel(i,j);//获取rgb
            ta = (rgb00 >> 24) & 0xff;
            tr = (rgb00 >> 16) & 0xff;  // r = qRed(rgb00);
            tg = (rgb00 >> 8) & 0xff;   //  g = qGreen(rgb00)
            tb = rgb00 & 0xff;          //b = qBlue(rgb00);
            int gray = tr*0.3+tg*0.59+tb*0.11;
            ImageBetter->setPixel(i,j,qRgb(gray,gray,gray));
        }
    }
}
//整数方法：Gray=(R*30+G*59+B*11)/100
void MainWindow::toGrayInt(QImage *image, QImage *ImageBetter)
{
    int height = image->height();
    int width = image->width();
    QRgb rgb00,rgb01;
    int ta = 0, tr = 0, tg = 0, tb = 0;
    for(int i = 0; i < width; i ++){
        for(int j = 0; j < height; j ++){
            rgb00 = image->pixel(i,j);//获取rgb
            ta = (rgb00 >> 24) & 0xff;
            tr = (rgb00 >> 16) & 0xff;   // r = qRed(rgb00);
            tg = (rgb00 >> 8) & 0xff;    //  g = qGreen(rgb00)
            tb = rgb00 & 0xff;           //b = qBlue(rgb00);
            int gray = (tr*30+tg*59+tb*11)/100;
            ImageBetter->setPixel(i,j,qRgb(gray,gray,gray));
        }
    }
}
//.移位方法：Gray =(R*76+G*151+B*28)>>8;
void MainWindow::toGrayDisplacement(QImage *image, QImage *ImageBetter)
{
    int height = image->height();
    int width = image->width();
    QRgb rgb00,rgb01;
    int ta = 0, tr = 0, tg = 0, tb = 0;
    for(int i = 0; i < width; i ++){
        for(int j = 0; j < height; j ++){
            rgb00 = image->pixel(i,j);//获取rgb
            ta = (rgb00 >> 24) & 0xff;//
            tr = (rgb00 >> 16) & 0xff; // r = qRed(rgb00);
            tg = (rgb00 >> 8) & 0xff;  //  g = qGreen(rgb00);
            tb = rgb00 & 0xff;         //b = qBlue(rgb00);
            int gray = (tr*76+tg*151+tb*28)>>8;
            ImageBetter->setPixel(i,j,qRgb(gray,gray,gray));
        }
    }
}
//.平均值法：Gray=（R+G+B）/3;
void MainWindow::toGrayAverage(QImage *image, QImage *ImageBetter)
{
    int height = image->height();
    int width = image->width();
    QRgb rgb00,rgb01;
    int ta = 0, tr = 0, tg = 0, tb = 0;
    for(int i = 0; i < width; i ++){
        for(int j = 0; j < height; j ++){
            rgb00 = image->pixel(i,j);//获取rgb
            ta = (rgb00 >> 24) & 0xff;//
            tr = (rgb00 >> 16) & 0xff; // r = qRed(rgb00);
            tg = (rgb00 >> 8) & 0xff;  //  g = qGreen(rgb00);
            tb = rgb00 & 0xff;         //b = qBlue(rgb00);
            int gray = (tr+tg+tb)/3;
            ImageBetter->setPixel(i,j,qRgb(gray,gray,gray));
        }
    }
}