This is a New Version tested for use on Unconverted Smartphone Cameras in Pro Mode as seen in this video:

https://www.youtube.com/watch?v=kXaF7jkB6Hs

I have been developing a brand new series of NDVI specialised filters for use with both standard and IR converted drone and smartphone cameras. Using these prototypes I am hoping to make some new developments in the use of single-camera near-infrared imaging and NDVI analysis for use in affordable environmental sensing and monitoring worldwide.

The 2 filters are essentially dual bandpass filters, made of high quality glass, with different transmission characteristics in the near-UV to blue band and Near-infrared band.



With IR converted cameras (hot mirror filter removal) the large resulting transitivity with this kind of filter can sometimes overexpose the sensor if taken during high brightness, i.e. during a very sunny day, so in practice although it provides a nice profile the high transmission does not necessarily provide the greatest way to characterize one section of healthy vegetation from another, which is the key factor we want to move forward beyond NIR imaging as just a nice trick for hobbyist photographers and using this technique as a reliable classification tool.

With standard unconverted cameras, (with no hot mirror filter removal) the depleted transmission of the NIR with this kind of filter causes the opposite problem to occur, namely very little IR is recorded by the sensor which means classification is limited. However, with camera settings adjustments, ISO and Exposure settings set to an optimum level for example, we can overcome this and still create NIR profiling so NIR filters can indeed be used by non converted cameras within some limits, i.e. the images must be taken during a very bright clear day at noon to minimize shadowing.