将图像读取到数组或矩阵

Question

I am a newbie to c++. I am using it for image processing. My basic idea is to load an image and store the pixel values or intensities into a matrix or an array, so that i can perform further manipulations on them.

So, what i have done so far is

  QPixmap pixmap("lena.bmp");
  pixmap = pixmap.copy(512,512,128,128);
  pixmap = pixmap.scaled(32,32);
  QImage image = pixmap.toImage();
  QRgb col;

  int g;
  int width = pixmap.width();
  int height = pixmap.height();
  matrix<double> m(width,height);

for (int j = 0; j < m.size2(); j++)
{
    for (int i = 0; i < m.size1(); i++)
    {
        col = image.pixel(i,j);
        g = qGray(col);

        image.setPixel(i,j,qRgb(g,g,g));
        m(i,j) = (image.pixel(i,j));

    }
}

for instance here i use Qpixmap in Qt for reading image and use boost to generate a matrix with the data.

But is there any other simpler way to read the image and to store it in a matrix? and perform manipulations and then display the new manipulated matrix as an image?

Answer 1

You could use OpenCV library, where images are by default represented as matrixes. OpenCV is very popular for image manipulation, and has many features. You can grab an example of loading image to matrix in OpenCV here: http://docs.opencv.org/doc/tutorials/introduction/display_image/display_image.html