Hiromi Takahashi Takahiro Saito Takashi Komatsu Variational Retinex Algorithm with its Application to a High - Quality Chroma Key. 977-980 2006 conf/icip/2006 ICIP http://dx.doi.org/10.1109/ICIP.2006.312651 db/conf/icip/icip2006.html#TakahashiSK06