Specifications

74 AUTOSTAR CCD PHOTOMETRY
Color Transform Coefficient Equations
((V – I) – (v – i)
o
) = (1 – 1 / α) * (V– I) + ζ
vi
/ α
((V – R) – (v – r)
o
) = (1 – 1 / β) * (V – R) + ζ
vr
/ β
((R – I) – (r – i)
o
) = (1 – 1 / γ) * (R – I) + ζ
ri
/ γ
(V – v
o
)=ε * (B – V) + ζ
v
((B – V) – (b – v)
o
) = (1 – 1 / μ) * (B – V) + ζ
bv
/ μ
Where:
α is (V–I) Transformation Coefficient
β is (V–R) transformation Coefficient
γ is (R–I) transformation Coefficient
ε is V Transformation Coefficient
μ is (B–V) Transformation Coefficient
ζ
vi
is (V–I) Zero Point
ζ
v
is V Zero Point
ζ
ri
is (R–I) Zero Point
ζ
bv
is (B–V) Zero Point
ζ
vr
is (V–R) Zero Point
Note: While the color transformation coefficients for V and (B–
V) are generally denoted by ε and μ , respectively, there does not
seem to be any standard for the R and I color transformation
coefficients. In this Appendix, the Greek letters α, β, and γ have
been assigned for the (V–I), (V–R), and (R–I) color
transformation coefficients, respectively. These equations are in
the form of the equation for a straight line: Y = MX + B, where M
is the slope and B is the Y intercept.