A matrix based method for determining depth from focus. - John Ens; Peter Lawrence (CVPR, 1991)

Real-time motion stereo. - John Ens; Ze-Nian Li (CVPR, 1993)

An Investigation of Methods for Determining Depth from Focus. - John Ens; Peter Lawrence (IEEE Trans. Pattern Anal. Mach. Intell., 1993)

Real-time Motion Stereo on SFU Pyramid. - John Ens; Ze-Nian Li (Real Time Imaging, 1995)