Here's a simple trick to remove the perspective from a photo.
Notice the lines are "distorted" because of the perspective.
1.
Draw a quick selection using the Crop Tool
2.
You will have to identify 'lines' that should be straight and
move the 'Corners' of your selection on the intersections of your
"want to be" straight lines.
Make sure the perspective box is checked
3.
Pull away the middle points and apply.
If
you look at box created by the lines, they should now be straight.
You can also show the Grid >View>Show>Grid (CTRL+").
Voilà!
This
trick also works if you take photos of your Layouts