/sci/ - Science & Math

>>9248696
Actually this is where it gets a bit odd--[math] a [/math] and [math] u [/math] are both vectors, while [math] a_i [/math], [math] u_i [/math], and [math] c [/math] are all scalars, as can be seen earlier in the paper.
The use of bold actually seems quite arbitrary.
[math] a [/math] and [math] u [/math] is intended to be a vector of weights and their corresponding color values, while c is the original pixel color.

Nevermind. You're right. u and c are 3-vectors, representing RGB color channels.