使用Rails Twitter gem在home_timeline中抓取图像或搜索图像？

I'm using Twitter gem with Rails 3.0 and I'm wondering if anyone knows how to locate images within home_timeline. I know that if an image is posted with a tweet, it has a link but I'm not sure where to start for searching it. Nothing I know worked so far.I'm using Twitter gem with Rails 3.0 and I'm wo