
Figure 1:(Color online) Color calibration of the color sensor module. (a) Normalized sensor output at the i-channel photodiode Xi = Vi=Vi;- max (i=r, g, and b) as a function of the RGB color coordinates of i-color light from a digital projector. The green and blue symbols at the r-channel photodiode (left) represent the data measured with this photodiode under green and blue light illumination, respectively. The dashed curves are the third-order polynomial fit of the color coordinates to the measured data Xi. The insets at the middle section show the spectral profiles of the red (R=255), green (G=255), and blue (B=255) light used, which yield Vi;max. (b) Post-calibration output at the i-channel photodide. The cross-talk in the calibrated data is closer to zero than that in (a).
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