Vora Value

Synonyms

Vora measure, ν

Definition

The Vora Value, ν, measures the recording accuracy of a set of color filters [1]. The definition of ν takes into account the viewing and recording illuminants and the target color space. The original definition is independent of the data set to be recorded, does not take into account recording noise, and is based on the Euclidean distance measure in the target color space.

Let $\mathbf{V}=\left[{\mathbf{v}}_1{\mathbf{v}}_2 \dots {\mathbf{v}}_{\mathrm{s}}\right]$ be an $N\times s$ matrix whose columns are the vectors (or functions) that define the target color space for a specified viewing illuminant. If we assume that the vectors of V are independent, then they define a basis for the span of V, $Span\Big({\left\{{\mathbf{v}}_i\right\}}_{i=1}^s$. To simplify notation, we denote the span of V by R_s(V), where the subscript denotes the dimension of the vector space. For example, v₁, v₂, v₃ could represent the three CIE XYZmatching functions...