Image distorion with scaling and motion

Hi there,

I am a newb - I very much appreciate any tips you have on this issue!

in my project: I basically have a high res image of a tv in the distance, that slowly gets closer and closer to the viewer. I have used keyframes and scaled it over 10 seconds to achieve this. I have noticed that the image quality gets jittery around the edges during motion. 

I thought maybe I need to reduce the amount of interpolation. When I right-click on the keyframes I see Bezier and liner etc..I have tried clicking on each of them but it hasn't really stopped the image edges from pixelating.

I am using Premier  23.2. Am I going down the right path?  Thanks!