Hello Neil,
Since advertising banners hoardings are paid ads as a general rule even if Google is able to somehow read the urls we can right away disqualify the SEO benefits. Plus, there is no flow of link juice from these image ad links.
Google book is definitely interesting one. Google books are a scanned image of the actual book so the links are not an actual link that could pass the link juice. Google also provides an ebook version of some books and the links on the ebooks are highlighted like a regular link but these are not clickable. It could be possible that Google will soon enable these links and link page rank juice will flow from these links the to the destination site. The only issue I see here is since these are hosted on Google is could very well be a nofollow so it could be given similar weight like a brand or social mention if Google decides to use the links for SEO ranking.