Droid@Screen tool enables you to display your android screen on your desktop in portrait/landscape mode and does image scaling too. 

You can launch Droid@Screen on terminal. 

$ java -jar droidAtScreen-0.5.1.jar


The program is available here http://blog.ribomation.com/droid-at-screen/ . 
The website is unavailable sometimes. So I decided to mirror this tool here. 

Read more for further information:
http://playingwithsid.blogspot.com/2012/03/how-to-display-your-android-screen-on.html