unit: a failing unit test to feature2d::BFMatcher

[sjbeskur]

You don't really want to merge this yet but I could use some help figuring this out

[twistedfall]

Thanks! This is related to #489, am I right? I'm away from the computer at the moment for a while, but I'll check it as soon as possible

[sjbeskur]

Yes that is correct this is related to issue #489. No rush and thanks for your attention.. Happy to help where I can be useful.

[sjbeskur]

anyone have and further insights on this?

[twistedfall]

Sorry for taking so long to get back to you! In this case the problem is that you must use the train_match function instead of match_ like this:

	let mut matches = opencv::types::VectorOfDMatch::new();
	bf_matcher.train_match(&des_a, &des_b, &mut matches, &no_array()).unwrap();

[sjbeskur]

Brilliant.. yep that did the trick. I've updated my pull request but maybe it's better as an example in case someone else has the same issue.