Kolkata: IIT Kharagpur alumnus Parag Havaldar has won the Technical Oscar for the development of expression-based facial performance-capture technology at Sony Pictures Imageworks, the institute said in a statement on Friday. The Indian-American graduated from the Department of Computer Science & Engineering at IIT Kharagpur in 1991. This pioneering system enabled large-scale use of animation rig-based facial performance-capture for motion pictures, combining solutions for tracking, stabilisation, solving and animator-controllable curve editing.-Agency