To add to that, the security image can potentially raise the barrier a lot more than the author led on. Usually [1], the bank asks you to answer a security question before showing you the personal security image. Most people don't see this because they check the "remember this computer" option the first time they login, so even showing the security question so that one can grab the image will seem suspicious to many users.

[1] I just tested this with Ally (the bank shown in the blog post) and I remember it being true with ING Direct. I haven't tested other banks.