Two firms making imaging and video software for the consumer and prosumer markets have tied the knot.

Fremont Calif.-based InterVideo Inc., through its Taiwanese subsidiary InterVideo Digital Tech, has now acquired two-thirds of the shares of Ulead Systems Inc., and is seeking to acquire the remaining third of shares from Ulead’s equity investors.

InterVideo is perhaps best known for its WinDVD line of DVD playback and authoring tools as well as Home Theatre, MediaOne and iVideo To Go for video iPod users. Taipei, Taiwan-headquartered Ulead, meanwhile, is the maker of such products as VideoStudio and PhotoImpact.

The two firms had already been collaborating to make their products compliant with the emerging next-generation DVD standards, HD-DVD and Blu-Ray.