ICIP 2006, Atlanta, GA
 

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Paper:MP-P6.4
Session:Color and Multispectral Processing
Time:Monday, October 9, 14:20 - 17:00
Presentation: Poster
Title: VARIATIONAL RETINEX ALGORITHM WITH ITS APPLICATION TO A HIGH-QUALITY CHROMA KEY
Authors: Hiromi Takahashi; Kanagawa University 
 Takahiro Saito; Kanagawa University 
 Takashi Komatsu; Kanagawa University 
Abstract: The Retinex theory deals with separation of irradiance and reflectance from an image. Recently, Kimmel and others proposed a variational framework that unifies the previous Poisson-equation-type Retinex algorithms developed by Horn and others, and presented a separation algorithm with the time-evolution of a linear diffusion process. However, this separation algorithm cannot achieve physically rational separation, if true irradiance varies among color channels. To cope with this problem, we introduce a nonlinear diffusion process into the time-evolution. Moreover, we introduce an approach to treat all color channels collectively. Furthermore, we apply our separation algorithm to a high quality chroma key where a color of each pixel in the foreground frame are adaptively corrected through transformation of the separated irradiance.