1. A system comprising: one or more cameras to capture a two-dimensional (2D) image of an environment and a three-dimensional (3D) image of the environment; memory; one or more processors; an object processing module maintained in the memory and executable by the one or more processors to: identify a first contour of an object from the 3D image; map the first contour of the object from the 3D image onto the 2D image; identify a second contour of the object from the 2D image; compare the first contour of the object from the 3D image to the second contour of the object from the 2D image; and determine a disparity between the first contour of the object from the 3D image and the second contour of the object from the 2D image; and an object determination module maintained in the memory and executable by the one or more processors to determine a final contour of the object based at least partly on a determination that the disparity is less than or equal to a threshold.