1. A method, comprising: performing, by one or more computers: receiving a plurality of stereo images of an object of a type and at least one three-dimensional input model of the same type of object; generating a three-dimensional stereo model of the object from the plurality of stereo images; computing a confidence measure for the stereo model; aligning the stereo model with the at least one input model resulting in an aligned model; and generating a fused model by combining the stereo model with the aligned model using the confidence measure to compute a weighted combination of the stereo model and the aligned model.