3 Camera Comparison with Rosco #2007 Filter

3 Camera Comparison with Rosco #2007 Filter

The images below represent some test results comparing 3 Canon Cameras, all of which have had their internal IR filters removed and added a Rosco #2007 filter. The intent is to find the “Best” solution for UAV aerial vegetation mapping with the intent of generating NDVI from a single Canon point and shoot camera. The Cameras in this test are an A490, A810, and SX230.  Each camera had custom white balance set in indirect natural light using a stack of white copy paper. Additionally, I tested several pure white and grey scale paint samples but the difference in the results was negligible (at least from my visual interpretation of NDVI).

I’m still working on interpreting and assessing the results. Any input is greatly appreciated.

FIJI/ ImageJ Photo Monitoring Plugin Settings

NDVISettins

LUT used NDVIBlu2Mag

ColorTable

Canon A490 with ROSCO #2007 filter, WB set to white copy paper in outdoor indirect sunlight

Canon a810 with ROSCO #2007 filter, WB set to white copy paper in outdoor indirect sunlight

Canon SX230 with ROSCO #2007 filter, WB set to white copy paper in outdoor indirect sunlight

Here are a couple sample aerial shots from the SX230 (unfortunately in low light so the focusing was not very good)

2 Comments

  1. subarooturbo

    In my humble opinion the imagers are not showing enough contrast in the vegetation NDVI imagers. The next NDVI photo test you should get a plant that is healthy and remove one stem about 10cm or 6in from the test plant. Then sit the removed stem and place it next to the plant and start your NDVI photos. Shortly after removing stem the internal structure of the plant will start to change and a good NDVI camera will pick this up. So by taking NDVI photos every hour for 6 to 8 hours then every 12 hours for 3 to 4 days all up will give a very good indication on the quality of the imagers. You should see in the photos the contrast between the living plant and the removed stem changing colours over the 3 day test. The thing is that you should also pick up a change in the plant colour with the NDVI image before you see any changes with the naked eye. Keep up the good work.

    • geobduffy

      Thank you for the feedback! This is exactly the type of guidance I need. I’ll conduct a test as close as possible to what you suggested although the 12hr intervals may be tough. I’ll get as close as I can. I’ll do the process you described above with 4 cameras. 3 Of the cameras (a490, a810, & ax230) will be modified with the Rosco 2007 filter. The 4th camera will be an unmodified sx260 from which I’ll show the visible representation of the plant at each interval to compare for assessing the NDVI cameras’ ability to detect stress before it is visible.
      One more thing I’ll attempt is to create a traditional NDVI using two cameras including the red band from the sx260 and NIR band from one of the modified cams. This should give some good material to assess.
      I look forward to your input on the results.

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