There is provided a 3D human machine interface ("3D HMI"), which 3D HMI may include (1) an image acquisition assembly, (2) an initializing module, (3) an image segmentation module, (4) a segmented data processing module, (5) a scoring module, (6) a projection module, (7) a fitting module,(8) a scoring and error detection module, (9) a recovery module, (10) a three dimensional correlation module, (11) a three dimensional skeleton prediction module, (12) an output module and a (13) depth extraction module.