metronom3 on "How to automatically create a post from JSON instead of RSS"

Instead of using RSS feeds to automatically update my blog using plugins such as WP Robot 4 or AutoBlog, I would like to use a JSON feed and to store the featured image from the JSON... Any ideas of a plugin I could use to do this? My host supports CRON so that could be used to automatically update the blog every 12 hours etc?

An example of the feed that im using is;

http://pipes.yahoo.com/pipes/pipe.run?_id=1120c2e787ea88eb5ff4ee6cea1ec1e6&_render=json

Which can be seen
http://jsonviewer.stack.hu/

The reason im trying to use Json instead of RSS is that I cannot get the imaage url to export to the RSS but the element is present in the JSON which is Item.News:Image