“…Flame imaging has already been investigated in the past, but most of these contributions were performed on laboratory scale combustion systems and premixed flames, and their approach was to compute geometrical and luminous properties of the flame extracted from gray scale images and use them to either classify the flame into arbitrarily defined states (Bertucco et al, 2000;Victor et al, 1991) or to predict various quantities such as flicker rate (Huang et al, 1999), unburnt carbon, CO 2 and NO x emissions (Shimoda et al, 1990;Lu et al, 1999;Yan et al, 2002) or fuel and air flow rates (Tao and Burkhardt, 1995). Only a few past investigations were extracting the flame features from RGB color images (Wang et al, 2002;Keyvan, 2003) and were taking advantage of the three wavelengths to estimate the flame temperature distribution using the bicolor method.…”