–

where ‘a’ and ‘b’ are the color plan Λ is the covariance which measures

) in the color planes ‘’

and ‘’ respectively.

λ

λdλ is the color stimulus function, which

λ, , λ λ

λdλ.

I(λ)

λ

= 1, …,

So the unknown parameter ‘’ and ‘’ are solved by matrix method

And the solution for ‘’ and ‘’ are given in equations

σ σ

– – –

– – –

where “Λ” is the covariance between the color channels and

“σ” is the variance of the color chan

of the initial threshold and the initial bit value (‘0’ or ‘1’). The MSB bit

− 1

–

ρ(u,v)

ρ(u,w)

ρ(v,w)

ρ(v ρ(v) and ρ( ρ(

If ρ( ρ(u,) and ρ(u,w) ρ(v,w) then select base =

If ρ(u,v) < ρ(u,w) and ρ(u,v) < ρ(v,w) then select base = W else

‘0’ is used U, ‘10’ is used for

‘11’ is used for W channel.