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Figure 5 | EURASIP Journal on Image and Video Processing

Figure 5

From: Analysis of colour constancy algorithms using the knowledge of variation of correlated colour temperature of daylight with solar elevation

Figure 5

The boundary of a pair that has the largest overlap between boundaries (Munsell samples: 2.5R 9/2 and 5Y 7/1) from 6-unit Munsell reflectance test set. (a) Boundaries go through the midpoint of the two clusters’ mean points; (b) boundaries touch each other and (c) boundary drawn with 90% of the Mahalanobis distance (D m 1 and D m 2). To represent noise each Gaussian sensor response was multiplied by 100 random numbers with mean value of 1 and a standard deviation of 1% to represent 100 nominally identical responses contaminated with 40-dB noise. Each open square shows the feature obtained from Munsell sample 2.5R 9/2 and each cross shows the feature obtained with Munsell sample 5Y 7/1 when illuminated by one of the CIE standard illuminant.

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