  Quanta image sensor (QIS) is envisioned to be the next generation image
sensor after CCD and CMOS. In this paper, we discuss how to design color filter
arrays for QIS and other small pixels. Designing color filter arrays for small
pixels is challenging because maximizing the light efficiency while suppressing
aliasing and crosstalk are conflicting tasks. We present an optimization-based
framework which unifies several mainstream color filter array design
methodologies. Our method offers greater generality and flexibility. Compared
to existing methods, the new framework can simultaneously handle luminance
sensitivity, chrominance sensitivity, cross-talk, anti-aliasing,
manufacturability and orthogonality. Extensive experimental comparisons
demonstrate the effectiveness of the framework.
