A whiteboard view camera, which in one embodiment is mounted on a boom, which is fixed above the whiteboard. The fluorescence response at the different treating agent dosages is used to determine whether the system is overdosed or underdosed on a continuous basis and to control treating agent dose accordingly. In an alternate embodiment, shared complementary write bit lines, a shared read bit line, separate read word lines, and separate write word lines are used. Respective inner and outer contours of the blank are geometrically similar.