I accidentally deleted an iMovie project, but I recovered it. Now it is too blurry to see!
sounds like you only recovered the low-quality proxies. 

The structure should be 


Project Name folder, containing

CurrentVersion.imovieevent file &amp;
Profect Name.rcproject folder, containing

Movies folder
Project file
Proxies folder
QuickLook




That applies whether you have the old iMovie structure or the new one.
If you have the new structure that doesn't look like a folder, then right click the iMovie Library 'file' &amp; select 'Show Package Contents' - then you will see the actual folder structure