Investigating and Proving of Multiplicative Lighting Correction in Color Characterization of Digital Camera

Digital color cameras are being taken attention for color appearance measurement. However, exploiting these devices needs some device calibrations. One of the most important tunings is the quality of lighting. Inhomogeneous lighting may cause some difficulties in measurements. Although the multiplicative inhomogeniteiy correction method has been used in many papers, none of them has ever rationalized this method. In this paper multiplicative inhomogeniteiy correction has been proved using linear model of camera. Moreover the effect of two correction methods including multiplicative and additive methods on the result of characterization of camera has been studied. The results showed that multiplicative correction method gives a better performance comparing other methods. Also, a proof has been given for efficiency of multiplicative correction method.