Re: returning a ublas matrix from a function

Ublas is a library for algebra, so the matrices or vectors could not
be displayed as an image. IMO, you should:

1 - Copy the contents of a GIL image to a matrix.

2 - Manipulate the contents of the matrix: filter,....

3 - Copy the matrix to a GIL image

4 - Show the contents of the new image.

Joaquim Duran


2014-08-22 9:08 GMT+02:00 sanann <[email protected]>:
> I am using boost for image processing, I found the boost::gil a bit too
> complicated for a newbie.. so instead i tried using other available
> libraries in boost to start off with.
>
> So basically what i want to do is
> 1. Read a gray scale image.
>
> 2. Load the pixel values into a boost matrix.
>
> 3. Apply a random filter to the matrix.
>
> 4. convert the matrix back into and image for display.
>
> so far what I have done is
>
>    < QPixmap pixmap("lena.bmp");
>
>    pixmap = pixmap.copy(512,512,128,128);
>    pixmap = pixmap.scaled(128,128);
>    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++)
>        {
>             m(i,j) = qGray(image.pixel(i,j));
>        }
>    }>
>
> so basically i guess the pixel values are being saved into a matrix 'm' now
> i would like to display this matrix as an image is there someway that i can
> do this?
>
> thanks in advance
>
>
>
> --
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