A method and apparatus for generating and optimizing a fundamental matrix for a first 2D image and a second 2D image to obtain the relative geometrical information between said two 2D images for points in the two 2D images that correspond to a mutual 3D point. Valve includes a movable sealing member that is relatively soft. The present invention also provides an extrusioninjection unit for use in-line compounding molding system that incorporates the improved extruder assembly. The platform can be contained within a housing having a low profile opening such that the container can be removed without elevating the container.