[![image explaining scenario](https://i.stack.imgur.com/6OGR6.jpg)](https://i.stack.imgur.com/6OGR6.jpg)How to scale only a bottom side of image? 
I made a photo of picture with distortion between top and bottom sides. I want to scale or resize only one bottom side to remove distortion. What means could do it or what easy program can do this? I do not know specific terms how to explain better.