Is face detection/image comparison (a la Google Goggles) out of scope for Stack Overflow? This (albeit provocatively named) question was closed and moved (twice) off SO and I'm scratching my head as to why. What do the 5 users and 1 mod see that I don't?
The question isn't the best, but the migration to Cross Validated doesn't make sense to me.
Closing a question because it's unclear is ok. If it's a bad question, why migrate? Closed questions can be edited for clarity and then potentially reopened.
I don't see anything horribly wrong with the title either. It gets people attention, people just need to read. For me, the issue is that it says In order to filter them out, how can I tell programmatically whether a picture is that of Justin Bieber? without any indication of effort into accomplishing this.
Regardless, where are the comments asking for clarification? Where are the comments explaining why the post was closed, the guiding comments?
I think the op needs to make certain that the question is firmly in the area of programming.
Simply saying, "how do I X, but programmatically?" isn't going to get a good response, especially if it shows the op has done little work. Essentially it becomes a plzsendmethecodez question.
If this question is going to pass muster, it's going to have to be simplified and broken down into smaller parts.
"how do I do image recognition?" would be a good start, for instance. Alternately "how do I find a particular person's face in a set of images."
For one thing, that question is arguably a duplicate of the question Face Recognition Logic, so it could be closed on those grounds as well.
I'd say that there certainly is a place for questions about face recognition or image processing, but those questions need to be much more specific than this one. Face recognition is a huge problem that many people have spent a lot of time working on, so you need to whittle down to a specific aspect of the problem.
For example, it's perfectly legitimate to ask if there are any existing face recognition libraries for the iPhone, or how to integrate OpenCV with an Android project. These are questions where you've identified a platform and a specific task you're trying to perform, so people can give clear answers that won't turn into research survey papers.
Other aspects of these problems, such as specific algorithms, math, or even the psychology of image analysis may be appropriate for other sites in the network, but if someone has a targeted code-related question, it's more than welcome on Stack Overflow.