I've read most of the Processing books that are available. You've got a lot of introductory-level books, which is of course very useful for programming/Processing beginners. Then you have a few special subject books (dataviz, nature simulation, generative art). As far as I know there are no books that deeply cover the first two topics you mention (pixels/videos). For interactive applications you may have a slightly better chance, depending on what you mean exactly. Since the "Making things..." series aren't real highflyers, the Programming Interactivity book is basically your only option. But you should realise this is a 3-in-1 book which is about Processing, Arduino and OpenFrameworks. Not always easy to read, but definitely an interesting and unique approach. I'd say it's worth the price. In my mind there is a lot of room for more in depth, intermediate-to-high level Processing books. But unfortunately they're not here yet.

Link: http://processing.org/learning/books/