Japanese Tech-On published an article about the latest TSR report "2010 CCD/CMOS Area Image Sensor Market Analysis". Most of the article is quite hard to interpret (see Google translation), but the graph below apparently shows year over year volumes and market shares for major image sensor companies:
It looks like Samsung is a big winner this year with its market share approaching Omnivision's. SETi market share has stabilized this year, while Galaxycore's rise mostly comes at Omnivision's expense.
Via Japanese Image Sensor blog.