RhinoCommon, recover image from PictureFrame


I forced an image into a geometry with this code:

System.Drawing.Rectangle rect = new Rectangle(0, 0, 1280, 1024);
Point2d point = new Point2d(0, 0);
Plane pln = new Plane(new Point3d(0, 0, -1), new Vector3d(0, 0, 1));
Guid id = RhinoDoc.ActiveDoc.Objects.AddPictureFrame(pln, imageFileName, false, 1280, 1024, false, false);

Then I saved my .3dm document and deleted the image file.
After reloading my .3dm document I would like to do the opposite: get the image given id. Any idea?

Thanks. L