<strong>Four alternative models for an infrared plant health camera.</strong>

1. 1) One camera with a filter switcher which switches between IR block and IR pass filters
2. 2) Two cameras, one unmodified and one with an IR pass filter
3. 3) One camera with a superblue (Schott BG3) filter.
4. 4) Two cameras, one unmodified and one with a superblue filter.


|Feature | ..1..|..2..|..3..|..4..|
|:----------------------------------------------------------------|:--------------------:|:--------------------:|:-------------------:|:-----------------:
|number of cameras|1|2|1|2
|filter switcher|1|0|0|0
|normal RGB color output|Y|Y|N|Y
|optics modified for RGB image?|Y|N|na|N
|NRG output|Y|Y|N|Y
|NDVI output|Y|Y|Y|Y
|shutter sync for NDVI|N|Y|N|N
|shutter sync for NRG|N|Y|na|Y
|rectification for NDVI|Y|Y|N|N
|rectification for NRG|Y|Y|na|Y
|parallax for NDVI|N|Y|N|N
|parallax for NRG|N|Y|na|Y
|RGB/NIR synchrony possible?|N|Y|Y|Y
|buy superblue filter?|N|N|Y|Y