Open your document.
Select white background which you want to delete.
Zoom on your page and delete white space between images.
Select Lasso Tool and select the object.
Now press Ctrl+J. Look your object have been pasted on new layer. Repeat this command on every object in your document.
Now delete Background layer, hey! you have created every object on different layer, now you can import this file on In Design or Corel or Illustrator.