1. A stereo image fetching device, comprising: a housing; a first camera attached to a side of the housing and configured to generate a first 2D image; a second camera attached to the side of the housing and configured to generate a second 2D image, a displacement between the first camera and the second camera being user configurable; and a depth matching module configured to generate a refined 3D image according to the first 2D image and the second 2D image.