1. An image sensor, comprising: an array of photosensitive elements formed using a semiconductor substrate; wherein each photosensitive element optically communicates with a unique portion of a filter, wherein each photosensitive element has a frequency sensitivity band that provides a lowered response to incident light of different frequencies, and wherein the array comprises a plurality of unit matrixes, wherein each unit matrix comprises: a first filter, a second filter, and a third filter, wherein each filter provides a filter function that is substantially different than the filter functions of the other filters; and a fourth filter that provides a filter function that is substantially equal to one of the first, second, and third filters, and wherein the fourth filter passes light in the lowered response frequency sensitivity band.