The times I've had close calls with pedestrians, it's been along a long empty stretch of road. Naturally they have to jaywalk right into my path without checking. I think what's going on is they don't register bicycles as a threat, they're only looking for cars and trucks. They don't look at you, they're pretending they don't see you so they don't have to act.
I think I'll handle this case by stopping right in front of them and blocking their progress. Then I'll ask them if they didn't see me or if they were pretending not to. Basically to assert my existence which they have been denying.