Figure 8 shows the result of both enhancements in a diagram and Figure 9 shows the effects on an
example picture.Spectral filtering and burst operation of the light source are effective methods to
improve the “ optical” SNR. The reason able sunlight rejection of these introduced methods is about -33db. But the remaining ratio of sunlight /active signal is still poor: Even the filtered sun is still a fact or of 400 brighter than the
pulsed LEDs. Additional sunlight rejection methods have to be found.