S. C. Li C. K. Lee Matching of IC Patterns under Non-Uniform Illumination. 555-558 1996 MVA http://b2.cvl.iis.u-tokyo.ac.jp/mva/proceedings/CommemorativeDVD/1996/papers/1996555.pdf conf/mva/1996 db/conf/mva/mva1996.html#LiL96